ibms-dome/Frontend - 複製/Content/js/statistics/c3/c3.js

/* @license C3.js v0.7.15 | (c) C3 Team and other contributors | http://c3js.org/ */
(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
  typeof define === 'function' && define.amd ? define(factory) :
  (global = global || self, global.c3 = factory());
}(this, (function () { 'use strict';

  function _typeof(obj) {
    if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
      _typeof = function (obj) {
        return typeof obj;
      };
    } else {
      _typeof = function (obj) {
        return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
      };
    }

    return _typeof(obj);
  }

  function _classCallCheck(instance, Constructor) {
    if (!(instance instanceof Constructor)) {
      throw new TypeError("Cannot call a class as a function");
    }
  }

  function _defineProperty(obj, key, value) {
    if (key in obj) {
      Object.defineProperty(obj, key, {
        value: value,
        enumerable: true,
        configurable: true,
        writable: true
      });
    } else {
      obj[key] = value;
    }

    return obj;
  }

  function _toConsumableArray(arr) {
    return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread();
  }

  function _arrayWithoutHoles(arr) {
    if (Array.isArray(arr)) {
      for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) arr2[i] = arr[i];

      return arr2;
    }
  }

  function _iterableToArray(iter) {
    if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === "[object Arguments]") return Array.from(iter);
  }

  function _nonIterableSpread() {
    throw new TypeError("Invalid attempt to spread non-iterable instance");
  }

  function ChartInternal(api) {
    var $$ = this; // Note: This part will be replaced by rollup-plugin-modify
    // When bundling esm output. Beware of changing this line.
    // TODO: Maybe we should check that the modification by rollup-plugin-modify
    // is valid during unit tests.

    $$.d3 = window.d3 ? window.d3 : typeof require !== 'undefined' ? require("d3") : undefined;
    $$.api = api;
    $$.config = $$.getDefaultConfig();
    $$.data = {};
    $$.cache = {};
    $$.axes = {};
  }

  /**
   * The Chart class
   *
   * The methods of this class is the public APIs of the chart object.
   */

  function Chart(config) {
    this.internal = new ChartInternal(this);
    this.internal.loadConfig(config);
    this.internal.beforeInit(config);
    this.internal.init();
    this.internal.afterInit(config); // bind "this" to nested API

    (function bindThis(fn, target, argThis) {
      Object.keys(fn).forEach(function (key) {
        target[key] = fn[key].bind(argThis);

        if (Object.keys(fn[key]).length > 0) {
          bindThis(fn[key], target[key], argThis);
        }
      });
    })(Chart.prototype, this, this);
  }

  var asHalfPixel = function asHalfPixel(n) {
    return Math.ceil(n) + 0.5;
  };
  var ceil10 = function ceil10(v) {
    return Math.ceil(v / 10) * 10;
  };
  var diffDomain = function diffDomain(d) {
    return d[1] - d[0];
  };
  var getOption = function getOption(options, key, defaultValue) {
    return isDefined(options[key]) ? options[key] : defaultValue;
  };
  var getPathBox = function getPathBox(path) {
    var box = getBBox(path),
        items = [path.pathSegList.getItem(0), path.pathSegList.getItem(1)],
        minX = items[0].x,
        minY = Math.min(items[0].y, items[1].y);
    return {
      x: minX,
      y: minY,
      width: box.width,
      height: box.height
    };
  };
  var getBBox = function getBBox(element) {
    try {
      return element.getBBox();
    } catch (ignore) {
      // Firefox will throw an exception if getBBox() is called whereas the
      // element is rendered with display:none
      // See https://github.com/c3js/c3/issues/2692
      // The previous code was using `getBoundingClientRect` which was returning
      // everything at 0 in this case so let's reproduce this behavior here.
      return {
        x: 0,
        y: 0,
        width: 0,
        height: 0
      };
    }
  };
  var hasValue = function hasValue(dict, value) {
    var found = false;
    Object.keys(dict).forEach(function (key) {
      if (dict[key] === value) {
        found = true;
      }
    });
    return found;
  };
  var isArray = function isArray(o) {
    return Array.isArray(o);
  };
  var isDefined = function isDefined(v) {
    return typeof v !== 'undefined';
  };
  var isEmpty = function isEmpty(o) {
    return typeof o === 'undefined' || o === null || isString(o) && o.length === 0 || _typeof(o) === 'object' && Object.keys(o).length === 0;
  };
  var isFunction = function isFunction(o) {
    return typeof o === 'function';
  };
  var isNumber = function isNumber(o) {
    return typeof o === 'number';
  };
  var isString = function isString(o) {
    return typeof o === 'string';
  };
  var isUndefined = function isUndefined(v) {
    return typeof v === 'undefined';
  };
  var isValue = function isValue(v) {
    return v || v === 0;
  };
  var notEmpty = function notEmpty(o) {
    return !isEmpty(o);
  };
  var sanitise = function sanitise(str) {
    return typeof str === 'string' ? str.replace(/</g, '&lt;').replace(/>/g, '&gt;') : str;
  };
  var flattenArray = function flattenArray(arr) {
    var _ref;

    return Array.isArray(arr) ? (_ref = []).concat.apply(_ref, _toConsumableArray(arr)) : [];
  };
  /**
   * Returns whether the point is within the given box.
   *
   * @param {Array} point An [x,y] coordinate
   * @param {Object} box An object with {x, y, width, height} keys
   * @param {Number} sensitivity An offset to ease check on very small boxes
   */

  var isWithinBox = function isWithinBox(point, box) {
    var sensitivity = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 0;
    var xStart = box.x - sensitivity;
    var xEnd = box.x + box.width + sensitivity;
    var yStart = box.y + box.height + sensitivity;
    var yEnd = box.y - sensitivity;
    return xStart < point[0] && point[0] < xEnd && yEnd < point[1] && point[1] < yStart;
  };
  /**
   * Returns Internet Explorer version number (or false if no Internet Explorer used).
   *
   * @param string agent Optional parameter to specify user agent
   */

  var getIEVersion = function getIEVersion(agent) {
    // https://stackoverflow.com/questions/19999388/check-if-user-is-using-ie
    if (typeof agent === 'undefined') {
      agent = window.navigator.userAgent;
    }

    var pos = agent.indexOf('MSIE '); // up to IE10

    if (pos > 0) {
      return parseInt(agent.substring(pos + 5, agent.indexOf('.', pos)), 10);
    }

    pos = agent.indexOf('Trident/'); // IE11

    if (pos > 0) {
      pos = agent.indexOf('rv:');
      return parseInt(agent.substring(pos + 3, agent.indexOf('.', pos)), 10);
    }

    return false;
  };
  /**
   * Returns whether the used browser is Internet Explorer.
   *
   * @param {Number} version Optional parameter to specify IE version
   */

  var isIE = function isIE(version) {
    var ver = getIEVersion();

    if (typeof version === 'undefined') {
      return !!ver;
    }

    return version === ver;
  };

  function AxisInternal(component, params) {
    var internal = this;
    internal.component = component;
    internal.params = params || {};
    internal.d3 = component.d3;
    internal.scale = internal.d3.scaleLinear();
    internal.range;
    internal.orient = "bottom";
    internal.innerTickSize = 6;
    internal.outerTickSize = this.params.withOuterTick ? 6 : 0;
    internal.tickPadding = 3;
    internal.tickValues = null;
    internal.tickFormat;
    internal.tickArguments;
    internal.tickOffset = 0;
    internal.tickCulling = true;
    internal.tickCentered;
    internal.tickTextCharSize;
    internal.tickTextRotate = internal.params.tickTextRotate;
    internal.tickLength;
    internal.axis = internal.generateAxis();
  }

  AxisInternal.prototype.axisX = function (selection, x, tickOffset) {
    selection.attr("transform", function (d) {
      return "translate(" + Math.ceil(x(d) + tickOffset) + ", 0)";
    });
  };

  AxisInternal.prototype.axisY = function (selection, y) {
    selection.attr("transform", function (d) {
      return "translate(0," + Math.ceil(y(d)) + ")";
    });
  };

  AxisInternal.prototype.scaleExtent = function (domain) {
    var start = domain[0],
        stop = domain[domain.length - 1];
    return start < stop ? [start, stop] : [stop, start];
  };

  AxisInternal.prototype.generateTicks = function (scale) {
    var internal = this;
    var i,
        domain,
        ticks = [];

    if (scale.ticks) {
      return scale.ticks.apply(scale, internal.tickArguments);
    }

    domain = scale.domain();

    for (i = Math.ceil(domain[0]); i < domain[1]; i++) {
      ticks.push(i);
    }

    if (ticks.length > 0 && ticks[0] > 0) {
      ticks.unshift(ticks[0] - (ticks[1] - ticks[0]));
    }

    return ticks;
  };

  AxisInternal.prototype.copyScale = function () {
    var internal = this;
    var newScale = internal.scale.copy(),
        domain;

    if (internal.params.isCategory) {
      domain = internal.scale.domain();
      newScale.domain([domain[0], domain[1] - 1]);
    }

    return newScale;
  };

  AxisInternal.prototype.textFormatted = function (v) {
    var internal = this,
        formatted = internal.tickFormat ? internal.tickFormat(v) : v;
    return typeof formatted !== 'undefined' ? formatted : '';
  };

  AxisInternal.prototype.updateRange = function () {
    var internal = this;
    internal.range = internal.scale.rangeExtent ? internal.scale.rangeExtent() : internal.scaleExtent(internal.scale.range());
    return internal.range;
  };

  AxisInternal.prototype.updateTickTextCharSize = function (tick) {
    var internal = this;

    if (internal.tickTextCharSize) {
      return internal.tickTextCharSize;
    }

    var size = {
      h: 11.5,
      w: 5.5
    };
    tick.select('text').text(function (d) {
      return internal.textFormatted(d);
    }).each(function (d) {
      var box = getBBox(this),
          text = internal.textFormatted(d),
          h = box.height,
          w = text ? box.width / text.length : undefined;

      if (h && w) {
        size.h = h;
        size.w = w;
      }
    }).text('');
    internal.tickTextCharSize = size;
    return size;
  };

  AxisInternal.prototype.isVertical = function () {
    return this.orient === 'left' || this.orient === 'right';
  };

  AxisInternal.prototype.tspanData = function (d, i, scale) {
    var internal = this;
    var splitted = internal.params.tickMultiline ? internal.splitTickText(d, scale) : [].concat(internal.textFormatted(d));

    if (internal.params.tickMultiline && internal.params.tickMultilineMax > 0) {
      splitted = internal.ellipsify(splitted, internal.params.tickMultilineMax);
    }

    return splitted.map(function (s) {
      return {
        index: i,
        splitted: s,
        length: splitted.length
      };
    });
  };

  AxisInternal.prototype.splitTickText = function (d, scale) {
    var internal = this,
        tickText = internal.textFormatted(d),
        maxWidth = internal.params.tickWidth,
        subtext,
        spaceIndex,
        textWidth,
        splitted = [];

    if (Object.prototype.toString.call(tickText) === "[object Array]") {
      return tickText;
    }

    if (!maxWidth || maxWidth <= 0) {
      maxWidth = internal.isVertical() ? 95 : internal.params.isCategory ? Math.ceil(scale(1) - scale(0)) - 12 : 110;
    }

    function split(splitted, text) {
      spaceIndex = undefined;

      for (var i = 1; i < text.length; i++) {
        if (text.charAt(i) === ' ') {
          spaceIndex = i;
        }

        subtext = text.substr(0, i + 1);
        textWidth = internal.tickTextCharSize.w * subtext.length; // if text width gets over tick width, split by space index or crrent index

        if (maxWidth < textWidth) {
          return split(splitted.concat(text.substr(0, spaceIndex ? spaceIndex : i)), text.slice(spaceIndex ? spaceIndex + 1 : i));
        }
      }

      return splitted.concat(text);
    }

    return split(splitted, tickText + "");
  };

  AxisInternal.prototype.ellipsify = function (splitted, max) {
    if (splitted.length <= max) {
      return splitted;
    }

    var ellipsified = splitted.slice(0, max);
    var remaining = 3;

    for (var i = max - 1; i >= 0; i--) {
      var available = ellipsified[i].length;
      ellipsified[i] = ellipsified[i].substr(0, available - remaining).padEnd(available, '.');
      remaining -= available;

      if (remaining <= 0) {
        break;
      }
    }

    return ellipsified;
  };

  AxisInternal.prototype.updateTickLength = function () {
    var internal = this;
    internal.tickLength = Math.max(internal.innerTickSize, 0) + internal.tickPadding;
  };

  AxisInternal.prototype.lineY2 = function (d) {
    var internal = this,
        tickPosition = internal.scale(d) + (internal.tickCentered ? 0 : internal.tickOffset);
    return internal.range[0] < tickPosition && tickPosition < internal.range[1] ? internal.innerTickSize : 0;
  };

  AxisInternal.prototype.textY = function () {
    var internal = this,
        rotate = internal.tickTextRotate;
    return rotate ? 11.5 - 2.5 * (rotate / 15) * (rotate > 0 ? 1 : -1) : internal.tickLength;
  };

  AxisInternal.prototype.textTransform = function () {
    var internal = this,
        rotate = internal.tickTextRotate;
    return rotate ? "rotate(" + rotate + ")" : "";
  };

  AxisInternal.prototype.textTextAnchor = function () {
    var internal = this,
        rotate = internal.tickTextRotate;
    return rotate ? rotate > 0 ? "start" : "end" : "middle";
  };

  AxisInternal.prototype.tspanDx = function () {
    var internal = this,
        rotate = internal.tickTextRotate;
    return rotate ? 8 * Math.sin(Math.PI * (rotate / 180)) : 0;
  };

  AxisInternal.prototype.tspanDy = function (d, i) {
    var internal = this,
        dy = internal.tickTextCharSize.h;

    if (i === 0) {
      if (internal.isVertical()) {
        dy = -((d.length - 1) * (internal.tickTextCharSize.h / 2) - 3);
      } else {
        dy = ".71em";
      }
    }

    return dy;
  };

  AxisInternal.prototype.generateAxis = function () {
    var internal = this,
        d3 = internal.d3,
        params = internal.params;

    function axis(g, transition) {
      var self;
      g.each(function () {
        var g = axis.g = d3.select(this);
        var scale0 = this.__chart__ || internal.scale,
            scale1 = this.__chart__ = internal.copyScale();
        var ticksValues = internal.tickValues ? internal.tickValues : internal.generateTicks(scale1),
            ticks = g.selectAll(".tick").data(ticksValues, scale1),
            tickEnter = ticks.enter().insert("g", ".domain").attr("class", "tick").style("opacity", 1e-6),
            // MEMO: No exit transition. The reason is this transition affects max tick width calculation because old tick will be included in the ticks.
        tickExit = ticks.exit().remove(),
            tickUpdate = ticks.merge(tickEnter),
            tickTransform,
            tickX,
            tickY;

        if (params.isCategory) {
          internal.tickOffset = Math.ceil((scale1(1) - scale1(0)) / 2);
          tickX = internal.tickCentered ? 0 : internal.tickOffset;
          tickY = internal.tickCentered ? internal.tickOffset : 0;
        } else {
          internal.tickOffset = tickX = 0;
        }

        internal.updateRange();
        internal.updateTickLength();
        internal.updateTickTextCharSize(g.select('.tick'));
        var lineUpdate = tickUpdate.select("line").merge(tickEnter.append("line")),
            textUpdate = tickUpdate.select("text").merge(tickEnter.append("text"));
        var tspans = tickUpdate.selectAll('text').selectAll('tspan').data(function (d, i) {
          return internal.tspanData(d, i, scale1);
        }),
            tspanEnter = tspans.enter().append('tspan'),
            tspanUpdate = tspanEnter.merge(tspans).text(function (d) {
          return d.splitted;
        });
        tspans.exit().remove();
        var path = g.selectAll(".domain").data([0]),
            pathUpdate = path.enter().append("path").merge(path).attr("class", "domain"); // TODO: each attr should be one function and change its behavior by internal.orient, probably

        switch (internal.orient) {
          case "bottom":
            {
              tickTransform = internal.axisX;
              lineUpdate.attr("x1", tickX).attr("x2", tickX).attr("y2", function (d, i) {
                return internal.lineY2(d, i);
              });
              textUpdate.attr("x", 0).attr("y", function (d, i) {
                return internal.textY(d, i);
              }).attr("transform", function (d, i) {
                return internal.textTransform(d, i);
              }).style("text-anchor", function (d, i) {
                return internal.textTextAnchor(d, i);
              });
              tspanUpdate.attr('x', 0).attr("dy", function (d, i) {
                return internal.tspanDy(d, i);
              }).attr('dx', function (d, i) {
                return internal.tspanDx(d, i);
              });
              pathUpdate.attr("d", "M" + internal.range[0] + "," + internal.outerTickSize + "V0H" + internal.range[1] + "V" + internal.outerTickSize);
              break;
            }

          case "top":
            {
              // TODO: rotated tick text
              tickTransform = internal.axisX;
              lineUpdate.attr("x1", tickX).attr("x2", tickX).attr("y2", function (d, i) {
                return -1 * internal.lineY2(d, i);
              });
              textUpdate.attr("x", 0).attr("y", function (d, i) {
                return -1 * internal.textY(d, i) - (params.isCategory ? 2 : internal.tickLength - 2);
              }).attr("transform", function (d, i) {
                return internal.textTransform(d, i);
              }).style("text-anchor", function (d, i) {
                return internal.textTextAnchor(d, i);
              });
              tspanUpdate.attr('x', 0).attr("dy", function (d, i) {
                return internal.tspanDy(d, i);
              }).attr('dx', function (d, i) {
                return internal.tspanDx(d, i);
              });
              pathUpdate.attr("d", "M" + internal.range[0] + "," + -internal.outerTickSize + "V0H" + internal.range[1] + "V" + -internal.outerTickSize);
              break;
            }

          case "left":
            {
              tickTransform = internal.axisY;
              lineUpdate.attr("x2", -internal.innerTickSize).attr("y1", tickY).attr("y2", tickY);
              textUpdate.attr("x", -internal.tickLength).attr("y", internal.tickOffset).style("text-anchor", "end");
              tspanUpdate.attr('x', -internal.tickLength).attr("dy", function (d, i) {
                return internal.tspanDy(d, i);
              });
              pathUpdate.attr("d", "M" + -internal.outerTickSize + "," + internal.range[0] + "H0V" + internal.range[1] + "H" + -internal.outerTickSize);
              break;
            }

          case "right":
            {
              tickTransform = internal.axisY;
              lineUpdate.attr("x2", internal.innerTickSize).attr("y1", tickY).attr("y2", tickY);
              textUpdate.attr("x", internal.tickLength).attr("y", internal.tickOffset).style("text-anchor", "start");
              tspanUpdate.attr('x', internal.tickLength).attr("dy", function (d, i) {
                return internal.tspanDy(d, i);
              });
              pathUpdate.attr("d", "M" + internal.outerTickSize + "," + internal.range[0] + "H0V" + internal.range[1] + "H" + internal.outerTickSize);
              break;
            }
        }

        if (scale1.rangeBand) {
          var x = scale1,
              dx = x.rangeBand() / 2;

          scale0 = scale1 = function scale1(d) {
            return x(d) + dx;
          };
        } else if (scale0.rangeBand) {
          scale0 = scale1;
        } else {
          tickExit.call(tickTransform, scale1, internal.tickOffset);
        }

        tickEnter.call(tickTransform, scale0, internal.tickOffset);
        self = (transition ? tickUpdate.transition(transition) : tickUpdate).style('opacity', 1).call(tickTransform, scale1, internal.tickOffset);
      });
      return self;
    }

    axis.scale = function (x) {
      if (!arguments.length) {
        return internal.scale;
      }

      internal.scale = x;
      return axis;
    };

    axis.orient = function (x) {
      if (!arguments.length) {
        return internal.orient;
      }

      internal.orient = x in {
        top: 1,
        right: 1,
        bottom: 1,
        left: 1
      } ? x + "" : "bottom";
      return axis;
    };

    axis.tickFormat = function (format) {
      if (!arguments.length) {
        return internal.tickFormat;
      }

      internal.tickFormat = format;
      return axis;
    };

    axis.tickCentered = function (isCentered) {
      if (!arguments.length) {
        return internal.tickCentered;
      }

      internal.tickCentered = isCentered;
      return axis;
    };

    axis.tickOffset = function () {
      return internal.tickOffset;
    };

    axis.tickInterval = function () {
      var interval, length;

      if (params.isCategory) {
        interval = internal.tickOffset * 2;
      } else {
        length = axis.g.select('path.domain').node().getTotalLength() - internal.outerTickSize * 2;
        interval = length / axis.g.selectAll('line').size();
      }

      return interval === Infinity ? 0 : interval;
    };

    axis.ticks = function () {
      if (!arguments.length) {
        return internal.tickArguments;
      }

      internal.tickArguments = arguments;
      return axis;
    };

    axis.tickCulling = function (culling) {
      if (!arguments.length) {
        return internal.tickCulling;
      }

      internal.tickCulling = culling;
      return axis;
    };

    axis.tickValues = function (x) {
      if (typeof x === 'function') {
        internal.tickValues = function () {
          return x(internal.scale.domain());
        };
      } else {
        if (!arguments.length) {
          return internal.tickValues;
        }

        internal.tickValues = x;
      }

      return axis;
    };

    return axis;
  };

  var CLASS = {
    target: 'c3-target',
    chart: 'c3-chart',
    chartLine: 'c3-chart-line',
    chartLines: 'c3-chart-lines',
    chartBar: 'c3-chart-bar',
    chartBars: 'c3-chart-bars',
    chartText: 'c3-chart-text',
    chartTexts: 'c3-chart-texts',
    chartArc: 'c3-chart-arc',
    chartArcs: 'c3-chart-arcs',
    chartArcsTitle: 'c3-chart-arcs-title',
    chartArcsBackground: 'c3-chart-arcs-background',
    chartArcsGaugeUnit: 'c3-chart-arcs-gauge-unit',
    chartArcsGaugeMax: 'c3-chart-arcs-gauge-max',
    chartArcsGaugeMin: 'c3-chart-arcs-gauge-min',
    selectedCircle: 'c3-selected-circle',
    selectedCircles: 'c3-selected-circles',
    eventRect: 'c3-event-rect',
    eventRects: 'c3-event-rects',
    eventRectsSingle: 'c3-event-rects-single',
    eventRectsMultiple: 'c3-event-rects-multiple',
    zoomRect: 'c3-zoom-rect',
    brush: 'c3-brush',
    dragZoom: 'c3-drag-zoom',
    focused: 'c3-focused',
    defocused: 'c3-defocused',
    region: 'c3-region',
    regions: 'c3-regions',
    title: 'c3-title',
    tooltipContainer: 'c3-tooltip-container',
    tooltip: 'c3-tooltip',
    tooltipName: 'c3-tooltip-name',
    shape: 'c3-shape',
    shapes: 'c3-shapes',
    line: 'c3-line',
    lines: 'c3-lines',
    bar: 'c3-bar',
    bars: 'c3-bars',
    circle: 'c3-circle',
    circles: 'c3-circles',
    arc: 'c3-arc',
    arcLabelLine: 'c3-arc-label-line',
    arcs: 'c3-arcs',
    area: 'c3-area',
    areas: 'c3-areas',
    empty: 'c3-empty',
    text: 'c3-text',
    texts: 'c3-texts',
    gaugeValue: 'c3-gauge-value',
    grid: 'c3-grid',
    gridLines: 'c3-grid-lines',
    xgrid: 'c3-xgrid',
    xgrids: 'c3-xgrids',
    xgridLine: 'c3-xgrid-line',
    xgridLines: 'c3-xgrid-lines',
    xgridFocus: 'c3-xgrid-focus',
    ygrid: 'c3-ygrid',
    ygrids: 'c3-ygrids',
    ygridLine: 'c3-ygrid-line',
    ygridLines: 'c3-ygrid-lines',
    colorScale: 'c3-colorscale',
    stanfordElements: 'c3-stanford-elements',
    stanfordLine: 'c3-stanford-line',
    stanfordLines: 'c3-stanford-lines',
    stanfordRegion: 'c3-stanford-region',
    stanfordRegions: 'c3-stanford-regions',
    stanfordText: 'c3-stanford-text',
    stanfordTexts: 'c3-stanford-texts',
    axis: 'c3-axis',
    axisX: 'c3-axis-x',
    axisXLabel: 'c3-axis-x-label',
    axisY: 'c3-axis-y',
    axisYLabel: 'c3-axis-y-label',
    axisY2: 'c3-axis-y2',
    axisY2Label: 'c3-axis-y2-label',
    legendBackground: 'c3-legend-background',
    legendItem: 'c3-legend-item',
    legendItemEvent: 'c3-legend-item-event',
    legendItemTile: 'c3-legend-item-tile',
    legendItemHidden: 'c3-legend-item-hidden',
    legendItemFocused: 'c3-legend-item-focused',
    dragarea: 'c3-dragarea',
    EXPANDED: '_expanded_',
    SELECTED: '_selected_',
    INCLUDED: '_included_'
  };

  var Axis = function Axis(owner) {
    _classCallCheck(this, Axis);

    this.owner = owner;
    this.d3 = owner.d3;
    this.internal = AxisInternal;
  };

  Axis.prototype.init = function init() {
    var $$ = this.owner,
        config = $$.config,
        main = $$.main;
    $$.axes.x = main.append("g").attr("class", CLASS.axis + ' ' + CLASS.axisX).attr("clip-path", config.axis_x_inner ? "" : $$.clipPathForXAxis).attr("transform", $$.getTranslate('x')).style("visibility", config.axis_x_show ? 'visible' : 'hidden');
    $$.axes.x.append("text").attr("class", CLASS.axisXLabel).attr("transform", config.axis_rotated ? "rotate(-90)" : "").style("text-anchor", this.textAnchorForXAxisLabel.bind(this));
    $$.axes.y = main.append("g").attr("class", CLASS.axis + ' ' + CLASS.axisY).attr("clip-path", config.axis_y_inner ? "" : $$.clipPathForYAxis).attr("transform", $$.getTranslate('y')).style("visibility", config.axis_y_show ? 'visible' : 'hidden');
    $$.axes.y.append("text").attr("class", CLASS.axisYLabel).attr("transform", config.axis_rotated ? "" : "rotate(-90)").style("text-anchor", this.textAnchorForYAxisLabel.bind(this));
    $$.axes.y2 = main.append("g").attr("class", CLASS.axis + ' ' + CLASS.axisY2) // clip-path?
    .attr("transform", $$.getTranslate('y2')).style("visibility", config.axis_y2_show ? 'visible' : 'hidden');
    $$.axes.y2.append("text").attr("class", CLASS.axisY2Label).attr("transform", config.axis_rotated ? "" : "rotate(-90)").style("text-anchor", this.textAnchorForY2AxisLabel.bind(this));
  };

  Axis.prototype.getXAxis = function getXAxis(scale, orient, tickFormat, tickValues, withOuterTick, withoutTransition, withoutRotateTickText) {
    var $$ = this.owner,
        config = $$.config,
        axisParams = {
      isCategory: $$.isCategorized(),
      withOuterTick: withOuterTick,
      tickMultiline: config.axis_x_tick_multiline,
      tickMultilineMax: config.axis_x_tick_multiline ? Number(config.axis_x_tick_multilineMax) : 0,
      tickWidth: config.axis_x_tick_width,
      tickTextRotate: withoutRotateTickText ? 0 : config.axis_x_tick_rotate,
      withoutTransition: withoutTransition
    },
        axis = new this.internal(this, axisParams).axis.scale(scale).orient(orient);

    if ($$.isTimeSeries() && tickValues && typeof tickValues !== "function") {
      tickValues = tickValues.map(function (v) {
        return $$.parseDate(v);
      });
    } // Set tick


    axis.tickFormat(tickFormat).tickValues(tickValues);

    if ($$.isCategorized()) {
      axis.tickCentered(config.axis_x_tick_centered);

      if (isEmpty(config.axis_x_tick_culling)) {
        config.axis_x_tick_culling = false;
      }
    }

    return axis;
  };

  Axis.prototype.updateXAxisTickValues = function updateXAxisTickValues(targets, axis) {
    var $$ = this.owner,
        config = $$.config,
        tickValues;

    if (config.axis_x_tick_fit || config.axis_x_tick_count) {
      tickValues = this.generateTickValues($$.mapTargetsToUniqueXs(targets), config.axis_x_tick_count, $$.isTimeSeries());
    }

    if (axis) {
      axis.tickValues(tickValues);
    } else {
      $$.xAxis.tickValues(tickValues);
      $$.subXAxis.tickValues(tickValues);
    }

    return tickValues;
  };

  Axis.prototype.getYAxis = function getYAxis(axisId, scale, orient, tickValues, withOuterTick, withoutTransition, withoutRotateTickText) {
    var $$ = this.owner;
    var config = $$.config;
    var tickFormat = config["axis_".concat(axisId, "_tick_format")];

    if (!tickFormat && $$.isAxisNormalized(axisId)) {
      tickFormat = function tickFormat(x) {
        return "".concat(x, "%");
      };
    }

    var axis = new this.internal(this, {
      withOuterTick: withOuterTick,
      withoutTransition: withoutTransition,
      tickTextRotate: withoutRotateTickText ? 0 : config.axis_y_tick_rotate
    }).axis.scale(scale).orient(orient);

    if (tickFormat) {
      axis.tickFormat(tickFormat);
    }

    if ($$.isTimeSeriesY()) {
      axis.ticks(config.axis_y_tick_time_type, config.axis_y_tick_time_interval);
    } else {
      axis.tickValues(tickValues);
    }

    return axis;
  };

  Axis.prototype.getId = function getId(id) {
    var config = this.owner.config;
    return id in config.data_axes ? config.data_axes[id] : 'y';
  };

  Axis.prototype.getXAxisTickFormat = function getXAxisTickFormat() {
    // #2251 previously set any negative values to a whole number,
    // however both should be truncated according to the users format specification
    var $$ = this.owner,
        config = $$.config;
    var format = $$.isTimeSeries() ? $$.defaultAxisTimeFormat : $$.isCategorized() ? $$.categoryName : function (v) {
      return v;
    };

    if (config.axis_x_tick_format) {
      if (isFunction(config.axis_x_tick_format)) {
        format = config.axis_x_tick_format;
      } else if ($$.isTimeSeries()) {
        format = function format(date) {
          return date ? $$.axisTimeFormat(config.axis_x_tick_format)(date) : "";
        };
      }
    }

    return isFunction(format) ? function (v) {
      return format.call($$, v);
    } : format;
  };

  Axis.prototype.getTickValues = function getTickValues(tickValues, axis) {
    return tickValues ? tickValues : axis ? axis.tickValues() : undefined;
  };

  Axis.prototype.getXAxisTickValues = function getXAxisTickValues() {
    return this.getTickValues(this.owner.config.axis_x_tick_values, this.owner.xAxis);
  };

  Axis.prototype.getYAxisTickValues = function getYAxisTickValues() {
    return this.getTickValues(this.owner.config.axis_y_tick_values, this.owner.yAxis);
  };

  Axis.prototype.getY2AxisTickValues = function getY2AxisTickValues() {
    return this.getTickValues(this.owner.config.axis_y2_tick_values, this.owner.y2Axis);
  };

  Axis.prototype.getLabelOptionByAxisId = function getLabelOptionByAxisId(axisId) {
    var $$ = this.owner,
        config = $$.config,
        option;

    if (axisId === 'y') {
      option = config.axis_y_label;
    } else if (axisId === 'y2') {
      option = config.axis_y2_label;
    } else if (axisId === 'x') {
      option = config.axis_x_label;
    }

    return option;
  };

  Axis.prototype.getLabelText = function getLabelText(axisId) {
    var option = this.getLabelOptionByAxisId(axisId);
    return isString(option) ? option : option ? option.text : null;
  };

  Axis.prototype.setLabelText = function setLabelText(axisId, text) {
    var $$ = this.owner,
        config = $$.config,
        option = this.getLabelOptionByAxisId(axisId);

    if (isString(option)) {
      if (axisId === 'y') {
        config.axis_y_label = text;
      } else if (axisId === 'y2') {
        config.axis_y2_label = text;
      } else if (axisId === 'x') {
        config.axis_x_label = text;
      }
    } else if (option) {
      option.text = text;
    }
  };

  Axis.prototype.getLabelPosition = function getLabelPosition(axisId, defaultPosition) {
    var option = this.getLabelOptionByAxisId(axisId),
        position = option && _typeof(option) === 'object' && option.position ? option.position : defaultPosition;
    return {
      isInner: position.indexOf('inner') >= 0,
      isOuter: position.indexOf('outer') >= 0,
      isLeft: position.indexOf('left') >= 0,
      isCenter: position.indexOf('center') >= 0,
      isRight: position.indexOf('right') >= 0,
      isTop: position.indexOf('top') >= 0,
      isMiddle: position.indexOf('middle') >= 0,
      isBottom: position.indexOf('bottom') >= 0
    };
  };

  Axis.prototype.getXAxisLabelPosition = function getXAxisLabelPosition() {
    return this.getLabelPosition('x', this.owner.config.axis_rotated ? 'inner-top' : 'inner-right');
  };

  Axis.prototype.getYAxisLabelPosition = function getYAxisLabelPosition() {
    return this.getLabelPosition('y', this.owner.config.axis_rotated ? 'inner-right' : 'inner-top');
  };

  Axis.prototype.getY2AxisLabelPosition = function getY2AxisLabelPosition() {
    return this.getLabelPosition('y2', this.owner.config.axis_rotated ? 'inner-right' : 'inner-top');
  };

  Axis.prototype.getLabelPositionById = function getLabelPositionById(id) {
    return id === 'y2' ? this.getY2AxisLabelPosition() : id === 'y' ? this.getYAxisLabelPosition() : this.getXAxisLabelPosition();
  };

  Axis.prototype.textForXAxisLabel = function textForXAxisLabel() {
    return this.getLabelText('x');
  };

  Axis.prototype.textForYAxisLabel = function textForYAxisLabel() {
    return this.getLabelText('y');
  };

  Axis.prototype.textForY2AxisLabel = function textForY2AxisLabel() {
    return this.getLabelText('y2');
  };

  Axis.prototype.xForAxisLabel = function xForAxisLabel(forHorizontal, position) {
    var $$ = this.owner;

    if (forHorizontal) {
      return position.isLeft ? 0 : position.isCenter ? $$.width / 2 : $$.width;
    } else {
      return position.isBottom ? -$$.height : position.isMiddle ? -$$.height / 2 : 0;
    }
  };

  Axis.prototype.dxForAxisLabel = function dxForAxisLabel(forHorizontal, position) {
    if (forHorizontal) {
      return position.isLeft ? "0.5em" : position.isRight ? "-0.5em" : "0";
    } else {
      return position.isTop ? "-0.5em" : position.isBottom ? "0.5em" : "0";
    }
  };

  Axis.prototype.textAnchorForAxisLabel = function textAnchorForAxisLabel(forHorizontal, position) {
    if (forHorizontal) {
      return position.isLeft ? 'start' : position.isCenter ? 'middle' : 'end';
    } else {
      return position.isBottom ? 'start' : position.isMiddle ? 'middle' : 'end';
    }
  };

  Axis.prototype.xForXAxisLabel = function xForXAxisLabel() {
    return this.xForAxisLabel(!this.owner.config.axis_rotated, this.getXAxisLabelPosition());
  };

  Axis.prototype.xForYAxisLabel = function xForYAxisLabel() {
    return this.xForAxisLabel(this.owner.config.axis_rotated, this.getYAxisLabelPosition());
  };

  Axis.prototype.xForY2AxisLabel = function xForY2AxisLabel() {
    return this.xForAxisLabel(this.owner.config.axis_rotated, this.getY2AxisLabelPosition());
  };

  Axis.prototype.dxForXAxisLabel = function dxForXAxisLabel() {
    return this.dxForAxisLabel(!this.owner.config.axis_rotated, this.getXAxisLabelPosition());
  };

  Axis.prototype.dxForYAxisLabel = function dxForYAxisLabel() {
    return this.dxForAxisLabel(this.owner.config.axis_rotated, this.getYAxisLabelPosition());
  };

  Axis.prototype.dxForY2AxisLabel = function dxForY2AxisLabel() {
    return this.dxForAxisLabel(this.owner.config.axis_rotated, this.getY2AxisLabelPosition());
  };

  Axis.prototype.dyForXAxisLabel = function dyForXAxisLabel() {
    var $$ = this.owner,
        config = $$.config,
        position = this.getXAxisLabelPosition();

    if (config.axis_rotated) {
      return position.isInner ? "1.2em" : -25 - ($$.config.axis_x_inner ? 0 : this.getMaxTickWidth('x'));
    } else {
      return position.isInner ? "-0.5em" : $$.getHorizontalAxisHeight('x') - 10;
    }
  };

  Axis.prototype.dyForYAxisLabel = function dyForYAxisLabel() {
    var $$ = this.owner,
        position = this.getYAxisLabelPosition();

    if ($$.config.axis_rotated) {
      return position.isInner ? "-0.5em" : "3em";
    } else {
      return position.isInner ? "1.2em" : -10 - ($$.config.axis_y_inner ? 0 : this.getMaxTickWidth('y') + 10);
    }
  };

  Axis.prototype.dyForY2AxisLabel = function dyForY2AxisLabel() {
    var $$ = this.owner,
        position = this.getY2AxisLabelPosition();

    if ($$.config.axis_rotated) {
      return position.isInner ? "1.2em" : "-2.2em";
    } else {
      return position.isInner ? "-0.5em" : 15 + ($$.config.axis_y2_inner ? 0 : this.getMaxTickWidth('y2') + 15);
    }
  };

  Axis.prototype.textAnchorForXAxisLabel = function textAnchorForXAxisLabel() {
    var $$ = this.owner;
    return this.textAnchorForAxisLabel(!$$.config.axis_rotated, this.getXAxisLabelPosition());
  };

  Axis.prototype.textAnchorForYAxisLabel = function textAnchorForYAxisLabel() {
    var $$ = this.owner;
    return this.textAnchorForAxisLabel($$.config.axis_rotated, this.getYAxisLabelPosition());
  };

  Axis.prototype.textAnchorForY2AxisLabel = function textAnchorForY2AxisLabel() {
    var $$ = this.owner;
    return this.textAnchorForAxisLabel($$.config.axis_rotated, this.getY2AxisLabelPosition());
  };

  Axis.prototype.getMaxTickWidth = function getMaxTickWidth(id, withoutRecompute) {
    var $$ = this.owner,
        maxWidth = 0,
        targetsToShow,
        scale,
        axis,
        dummy,
        svg;

    if (withoutRecompute && $$.currentMaxTickWidths[id]) {
      return $$.currentMaxTickWidths[id];
    }

    if ($$.svg) {
      targetsToShow = $$.filterTargetsToShow($$.data.targets);

      if (id === 'y') {
        scale = $$.y.copy().domain($$.getYDomain(targetsToShow, 'y'));
        axis = this.getYAxis(id, scale, $$.yOrient, $$.yAxisTickValues, false, true, true);
      } else if (id === 'y2') {
        scale = $$.y2.copy().domain($$.getYDomain(targetsToShow, 'y2'));
        axis = this.getYAxis(id, scale, $$.y2Orient, $$.y2AxisTickValues, false, true, true);
      } else {
        scale = $$.x.copy().domain($$.getXDomain(targetsToShow));
        axis = this.getXAxis(scale, $$.xOrient, $$.xAxisTickFormat, $$.xAxisTickValues, false, true, true);
        this.updateXAxisTickValues(targetsToShow, axis);
      }

      dummy = $$.d3.select('body').append('div').classed('c3', true);
      svg = dummy.append("svg").style('visibility', 'hidden').style('position', 'fixed').style('top', 0).style('left', 0), svg.append('g').call(axis).each(function () {
        $$.d3.select(this).selectAll('text').each(function () {
          var box = getBBox(this);

          if (maxWidth < box.width) {
            maxWidth = box.width;
          }
        });
        dummy.remove();
      });
    }

    $$.currentMaxTickWidths[id] = maxWidth <= 0 ? $$.currentMaxTickWidths[id] : maxWidth;
    return $$.currentMaxTickWidths[id];
  };

  Axis.prototype.updateLabels = function updateLabels(withTransition) {
    var $$ = this.owner;
    var axisXLabel = $$.main.select('.' + CLASS.axisX + ' .' + CLASS.axisXLabel),
        axisYLabel = $$.main.select('.' + CLASS.axisY + ' .' + CLASS.axisYLabel),
        axisY2Label = $$.main.select('.' + CLASS.axisY2 + ' .' + CLASS.axisY2Label);
    (withTransition ? axisXLabel.transition() : axisXLabel).attr("x", this.xForXAxisLabel.bind(this)).attr("dx", this.dxForXAxisLabel.bind(this)).attr("dy", this.dyForXAxisLabel.bind(this)).text(this.textForXAxisLabel.bind(this));
    (withTransition ? axisYLabel.transition() : axisYLabel).attr("x", this.xForYAxisLabel.bind(this)).attr("dx", this.dxForYAxisLabel.bind(this)).attr("dy", this.dyForYAxisLabel.bind(this)).text(this.textForYAxisLabel.bind(this));
    (withTransition ? axisY2Label.transition() : axisY2Label).attr("x", this.xForY2AxisLabel.bind(this)).attr("dx", this.dxForY2AxisLabel.bind(this)).attr("dy", this.dyForY2AxisLabel.bind(this)).text(this.textForY2AxisLabel.bind(this));
  };

  Axis.prototype.getPadding = function getPadding(padding, key, defaultValue, domainLength) {
    var p = typeof padding === 'number' ? padding : padding[key];

    if (!isValue(p)) {
      return defaultValue;
    }

    if (padding.unit === 'ratio') {
      return padding[key] * domainLength;
    } // assume padding is pixels if unit is not specified


    return this.convertPixelsToAxisPadding(p, domainLength);
  };

  Axis.prototype.convertPixelsToAxisPadding = function convertPixelsToAxisPadding(pixels, domainLength) {
    var $$ = this.owner,
        length = $$.config.axis_rotated ? $$.width : $$.height;
    return domainLength * (pixels / length);
  };

  Axis.prototype.generateTickValues = function generateTickValues(values, tickCount, forTimeSeries) {
    var tickValues = values,
        targetCount,
        start,
        end,
        count,
        interval,
        i,
        tickValue;

    if (tickCount) {
      targetCount = isFunction(tickCount) ? tickCount() : tickCount; // compute ticks according to tickCount

      if (targetCount === 1) {
        tickValues = [values[0]];
      } else if (targetCount === 2) {
        tickValues = [values[0], values[values.length - 1]];
      } else if (targetCount > 2) {
        count = targetCount - 2;
        start = values[0];
        end = values[values.length - 1];
        interval = (end - start) / (count + 1); // re-construct unique values

        tickValues = [start];

        for (i = 0; i < count; i++) {
          tickValue = +start + interval * (i + 1);
          tickValues.push(forTimeSeries ? new Date(tickValue) : tickValue);
        }

        tickValues.push(end);
      }
    }

    if (!forTimeSeries) {
      tickValues = tickValues.sort(function (a, b) {
        return a - b;
      });
    }

    return tickValues;
  };

  Axis.prototype.generateTransitions = function generateTransitions(duration) {
    var $$ = this.owner,
        axes = $$.axes;
    return {
      axisX: duration ? axes.x.transition().duration(duration) : axes.x,
      axisY: duration ? axes.y.transition().duration(duration) : axes.y,
      axisY2: duration ? axes.y2.transition().duration(duration) : axes.y2,
      axisSubX: duration ? axes.subx.transition().duration(duration) : axes.subx
    };
  };

  Axis.prototype.redraw = function redraw(duration, isHidden) {
    var $$ = this.owner,
        transition = duration ? $$.d3.transition().duration(duration) : null;
    $$.axes.x.style("opacity", isHidden ? 0 : 1).call($$.xAxis, transition);
    $$.axes.y.style("opacity", isHidden ? 0 : 1).call($$.yAxis, transition);
    $$.axes.y2.style("opacity", isHidden ? 0 : 1).call($$.y2Axis, transition);
    $$.axes.subx.style("opacity", isHidden ? 0 : 1).call($$.subXAxis, transition);
  };

  var c3 = {
    version: "0.7.15",
    chart: {
      fn: Chart.prototype,
      internal: {
        fn: ChartInternal.prototype,
        axis: {
          fn: Axis.prototype,
          internal: {
            fn: AxisInternal.prototype
          }
        }
      }
    },
    generate: function generate(config) {
      return new Chart(config);
    }
  };

  ChartInternal.prototype.beforeInit = function () {// can do something
  };

  ChartInternal.prototype.afterInit = function () {// can do something
  };

  ChartInternal.prototype.init = function () {
    var $$ = this,
        config = $$.config;
    $$.initParams();

    if (config.data_url) {
      $$.convertUrlToData(config.data_url, config.data_mimeType, config.data_headers, config.data_keys, $$.initWithData);
    } else if (config.data_json) {
      $$.initWithData($$.convertJsonToData(config.data_json, config.data_keys));
    } else if (config.data_rows) {
      $$.initWithData($$.convertRowsToData(config.data_rows));
    } else if (config.data_columns) {
      $$.initWithData($$.convertColumnsToData(config.data_columns));
    } else {
      throw Error('url or json or rows or columns is required.');
    }
  };

  ChartInternal.prototype.initParams = function () {
    var $$ = this,
        d3 = $$.d3,
        config = $$.config; // MEMO: clipId needs to be unique because it conflicts when multiple charts exist

    $$.clipId = "c3-" + +new Date() + '-clip';
    $$.clipIdForXAxis = $$.clipId + '-xaxis';
    $$.clipIdForYAxis = $$.clipId + '-yaxis';
    $$.clipIdForGrid = $$.clipId + '-grid';
    $$.clipIdForSubchart = $$.clipId + '-subchart';
    $$.clipPath = $$.getClipPath($$.clipId);
    $$.clipPathForXAxis = $$.getClipPath($$.clipIdForXAxis);
    $$.clipPathForYAxis = $$.getClipPath($$.clipIdForYAxis);
    $$.clipPathForGrid = $$.getClipPath($$.clipIdForGrid);
    $$.clipPathForSubchart = $$.getClipPath($$.clipIdForSubchart);
    $$.dragStart = null;
    $$.dragging = false;
    $$.flowing = false;
    $$.cancelClick = false;
    $$.mouseover = undefined;
    $$.transiting = false;
    $$.color = $$.generateColor();
    $$.levelColor = $$.generateLevelColor();
    $$.dataTimeParse = (config.data_xLocaltime ? d3.timeParse : d3.utcParse)($$.config.data_xFormat);
    $$.axisTimeFormat = config.axis_x_localtime ? d3.timeFormat : d3.utcFormat;

    $$.defaultAxisTimeFormat = function (date) {
      if (date.getMilliseconds()) {
        return d3.timeFormat(".%L")(date);
      }

      if (date.getSeconds()) {
        return d3.timeFormat(":%S")(date);
      }

      if (date.getMinutes()) {
        return d3.timeFormat("%I:%M")(date);
      }

      if (date.getHours()) {
        return d3.timeFormat("%I %p")(date);
      }

      if (date.getDay() && date.getDate() !== 1) {
        return d3.timeFormat("%-m/%-d")(date);
      }

      if (date.getDate() !== 1) {
        return d3.timeFormat("%-m/%-d")(date);
      }

      if (date.getMonth()) {
        return d3.timeFormat("%-m/%-d")(date);
      }

      return d3.timeFormat("%Y/%-m/%-d")(date);
    };

    $$.hiddenTargetIds = [];
    $$.hiddenLegendIds = [];
    $$.focusedTargetIds = [];
    $$.defocusedTargetIds = [];
    $$.xOrient = config.axis_rotated ? config.axis_x_inner ? "right" : "left" : config.axis_x_inner ? "top" : "bottom";
    $$.yOrient = config.axis_rotated ? config.axis_y_inner ? "top" : "bottom" : config.axis_y_inner ? "right" : "left";
    $$.y2Orient = config.axis_rotated ? config.axis_y2_inner ? "bottom" : "top" : config.axis_y2_inner ? "left" : "right";
    $$.subXOrient = config.axis_rotated ? "left" : "bottom";
    $$.isLegendRight = config.legend_position === 'right';
    $$.isLegendInset = config.legend_position === 'inset';
    $$.isLegendTop = config.legend_inset_anchor === 'top-left' || config.legend_inset_anchor === 'top-right';
    $$.isLegendLeft = config.legend_inset_anchor === 'top-left' || config.legend_inset_anchor === 'bottom-left';
    $$.legendStep = 0;
    $$.legendItemWidth = 0;
    $$.legendItemHeight = 0;
    $$.currentMaxTickWidths = {
      x: 0,
      y: 0,
      y2: 0
    };
    $$.rotated_padding_left = 30;
    $$.rotated_padding_right = config.axis_rotated && !config.axis_x_show ? 0 : 30;
    $$.rotated_padding_top = 5;
    $$.withoutFadeIn = {};
    $$.intervalForObserveInserted = undefined;
    $$.axes.subx = d3.selectAll([]); // needs when excluding subchart.js
  };

  ChartInternal.prototype.initChartElements = function () {
    if (this.initBar) {
      this.initBar();
    }

    if (this.initLine) {
      this.initLine();
    }

    if (this.initArc) {
      this.initArc();
    }

    if (this.initGauge) {
      this.initGauge();
    }

    if (this.initText) {
      this.initText();
    }
  };

  ChartInternal.prototype.initWithData = function (data) {
    var $$ = this,
        d3 = $$.d3,
        config = $$.config;
    var defs,
        main,
        binding = true;
    $$.axis = new Axis($$);

    if (!config.bindto) {
      $$.selectChart = d3.selectAll([]);
    } else if (typeof config.bindto.node === 'function') {
      $$.selectChart = config.bindto;
    } else {
      $$.selectChart = d3.select(config.bindto);
    }

    if ($$.selectChart.empty()) {
      $$.selectChart = d3.select(document.createElement('div')).style('opacity', 0);
      $$.observeInserted($$.selectChart);
      binding = false;
    }

    $$.selectChart.html("").classed("c3", true); // Init data as targets

    $$.data.xs = {};
    $$.data.targets = $$.convertDataToTargets(data);

    if (config.data_filter) {
      $$.data.targets = $$.data.targets.filter(config.data_filter);
    } // Set targets to hide if needed


    if (config.data_hide) {
      $$.addHiddenTargetIds(config.data_hide === true ? $$.mapToIds($$.data.targets) : config.data_hide);
    }

    if (config.legend_hide) {
      $$.addHiddenLegendIds(config.legend_hide === true ? $$.mapToIds($$.data.targets) : config.legend_hide);
    }

    if ($$.isStanfordGraphType()) {
      $$.initStanfordData();
    } // Init sizes and scales


    $$.updateSizes();
    $$.updateScales(); // Set domains for each scale

    $$.x.domain(d3.extent($$.getXDomain($$.data.targets)));
    $$.y.domain($$.getYDomain($$.data.targets, 'y'));
    $$.y2.domain($$.getYDomain($$.data.targets, 'y2'));
    $$.subX.domain($$.x.domain());
    $$.subY.domain($$.y.domain());
    $$.subY2.domain($$.y2.domain()); // Save original x domain for zoom update

    $$.orgXDomain = $$.x.domain();
    /*-- Basic Elements --*/
    // Define svgs

    $$.svg = $$.selectChart.append("svg").style("overflow", "hidden").on('mouseenter', function () {
      return config.onmouseover.call($$);
    }).on('mouseleave', function () {
      return config.onmouseout.call($$);
    });

    if ($$.config.svg_classname) {
      $$.svg.attr('class', $$.config.svg_classname);
    } // Define defs


    defs = $$.svg.append("defs");
    $$.clipChart = $$.appendClip(defs, $$.clipId);
    $$.clipXAxis = $$.appendClip(defs, $$.clipIdForXAxis);
    $$.clipYAxis = $$.appendClip(defs, $$.clipIdForYAxis);
    $$.clipGrid = $$.appendClip(defs, $$.clipIdForGrid);
    $$.clipSubchart = $$.appendClip(defs, $$.clipIdForSubchart);
    $$.updateSvgSize(); // Define regions

    main = $$.main = $$.svg.append("g").attr("transform", $$.getTranslate('main'));

    if ($$.initPie) {
      $$.initPie();
    }

    if ($$.initDragZoom) {
      $$.initDragZoom();
    }

    if (config.subchart_show && $$.initSubchart) {
      $$.initSubchart();
    }

    if ($$.initTooltip) {
      $$.initTooltip();
    }

    if ($$.initLegend) {
      $$.initLegend();
    }

    if ($$.initTitle) {
      $$.initTitle();
    }

    if ($$.initZoom) {
      $$.initZoom();
    }

    if ($$.isStanfordGraphType()) {
      $$.drawColorScale();
    } // Update selection based on size and scale
    // TODO: currently this must be called after initLegend because of update of sizes, but it should be done in initSubchart.


    if (config.subchart_show && $$.initSubchartBrush) {
      $$.initSubchartBrush();
    }
    /*-- Main Region --*/
    // text when empty


    main.append("text").attr("class", CLASS.text + ' ' + CLASS.empty).attr("text-anchor", "middle") // horizontal centering of text at x position in all browsers.
    .attr("dominant-baseline", "middle"); // vertical centering of text at y position in all browsers, except IE.
    // Regions

    $$.initRegion(); // Grids

    $$.initGrid(); // Define g for chart area

    main.append('g').attr("clip-path", $$.clipPath).attr('class', CLASS.chart); // Grid lines

    if (config.grid_lines_front) {
      $$.initGridLines();
    }

    $$.initStanfordElements(); // Cover whole with rects for events

    $$.initEventRect(); // Define g for chart

    $$.initChartElements(); // Add Axis

    $$.axis.init(); // Set targets

    $$.updateTargets($$.data.targets); // Set default extent if defined

    if (config.axis_x_selection) {
      $$.brush.selectionAsValue($$.getDefaultSelection());
    } // Draw with targets


    if (binding) {
      $$.updateDimension();
      $$.config.oninit.call($$);
      $$.redraw({
        withTransition: false,
        withTransform: true,
        withUpdateXDomain: true,
        withUpdateOrgXDomain: true,
        withTransitionForAxis: false
      });
    } // Bind to resize event


    $$.bindResize(); // Bind to window focus event

    $$.bindWindowFocus(); // export element of the chart

    $$.api.element = $$.selectChart.node();
  };

  ChartInternal.prototype.smoothLines = function (el, type) {
    var $$ = this;

    if (type === 'grid') {
      el.each(function () {
        var g = $$.d3.select(this),
            x1 = g.attr('x1'),
            x2 = g.attr('x2'),
            y1 = g.attr('y1'),
            y2 = g.attr('y2');
        g.attr({
          'x1': Math.ceil(x1),
          'x2': Math.ceil(x2),
          'y1': Math.ceil(y1),
          'y2': Math.ceil(y2)
        });
      });
    }
  };

  ChartInternal.prototype.updateSizes = function () {
    var $$ = this,
        config = $$.config;
    var legendHeight = $$.legend ? $$.getLegendHeight() : 0,
        legendWidth = $$.legend ? $$.getLegendWidth() : 0,
        legendHeightForBottom = $$.isLegendRight || $$.isLegendInset ? 0 : legendHeight,
        hasArc = $$.hasArcType(),
        xAxisHeight = config.axis_rotated || hasArc ? 0 : $$.getHorizontalAxisHeight('x'),
        subchartHeight = config.subchart_show && !hasArc ? config.subchart_size_height + xAxisHeight : 0;
    $$.currentWidth = $$.getCurrentWidth();
    $$.currentHeight = $$.getCurrentHeight(); // for main

    $$.margin = config.axis_rotated ? {
      top: $$.getHorizontalAxisHeight('y2') + $$.getCurrentPaddingTop(),
      right: hasArc ? 0 : $$.getCurrentPaddingRight(),
      bottom: $$.getHorizontalAxisHeight('y') + legendHeightForBottom + $$.getCurrentPaddingBottom(),
      left: subchartHeight + (hasArc ? 0 : $$.getCurrentPaddingLeft())
    } : {
      top: 4 + $$.getCurrentPaddingTop(),
      // for top tick text
      right: hasArc ? 0 : $$.getCurrentPaddingRight(),
      bottom: xAxisHeight + subchartHeight + legendHeightForBottom + $$.getCurrentPaddingBottom(),
      left: hasArc ? 0 : $$.getCurrentPaddingLeft()
    }; // for subchart

    $$.margin2 = config.axis_rotated ? {
      top: $$.margin.top,
      right: NaN,
      bottom: 20 + legendHeightForBottom,
      left: $$.rotated_padding_left
    } : {
      top: $$.currentHeight - subchartHeight - legendHeightForBottom,
      right: NaN,
      bottom: xAxisHeight + legendHeightForBottom,
      left: $$.margin.left
    }; // for legend

    $$.margin3 = {
      top: 0,
      right: NaN,
      bottom: 0,
      left: 0
    };

    if ($$.updateSizeForLegend) {
      $$.updateSizeForLegend(legendHeight, legendWidth);
    }

    $$.width = $$.currentWidth - $$.margin.left - $$.margin.right;
    $$.height = $$.currentHeight - $$.margin.top - $$.margin.bottom;

    if ($$.width < 0) {
      $$.width = 0;
    }

    if ($$.height < 0) {
      $$.height = 0;
    }

    $$.width2 = config.axis_rotated ? $$.margin.left - $$.rotated_padding_left - $$.rotated_padding_right : $$.width;
    $$.height2 = config.axis_rotated ? $$.height : $$.currentHeight - $$.margin2.top - $$.margin2.bottom;

    if ($$.width2 < 0) {
      $$.width2 = 0;
    }

    if ($$.height2 < 0) {
      $$.height2 = 0;
    } // for arc


    $$.arcWidth = $$.width - ($$.isLegendRight ? legendWidth + 10 : 0);
    $$.arcHeight = $$.height - ($$.isLegendRight ? 0 : 10);

    if ($$.hasType('gauge') && !config.gauge_fullCircle) {
      $$.arcHeight += $$.height - $$.getGaugeLabelHeight();
    }

    if ($$.updateRadius) {
      $$.updateRadius();
    }

    if ($$.isLegendRight && hasArc) {
      $$.margin3.left = $$.arcWidth / 2 + $$.radiusExpanded * 1.1;
    }
  };

  ChartInternal.prototype.updateTargets = function (targets) {
    var $$ = this,
        config = $$.config;
    /*-- Main --*/
    //-- Text --//

    $$.updateTargetsForText(targets); //-- Bar --//

    $$.updateTargetsForBar(targets); //-- Line --//

    $$.updateTargetsForLine(targets); //-- Arc --//

    if ($$.hasArcType() && $$.updateTargetsForArc) {
      $$.updateTargetsForArc(targets);
    }
    /*-- Sub --*/


    if (config.subchart_show && $$.updateTargetsForSubchart) {
      $$.updateTargetsForSubchart(targets);
    } // Fade-in each chart


    $$.showTargets();
  };

  ChartInternal.prototype.showTargets = function () {
    var $$ = this;
    $$.svg.selectAll('.' + CLASS.target).filter(function (d) {
      return $$.isTargetToShow(d.id);
    }).transition().duration($$.config.transition_duration).style("opacity", 1);
  };

  ChartInternal.prototype.redraw = function (options, transitions) {
    var $$ = this,
        main = $$.main,
        d3 = $$.d3,
        config = $$.config;
    var areaIndices = $$.getShapeIndices($$.isAreaType),
        barIndices = $$.getShapeIndices($$.isBarType),
        lineIndices = $$.getShapeIndices($$.isLineType);
    var withY, withSubchart, withTransition, withTransitionForExit, withTransitionForAxis, withTransform, withUpdateXDomain, withUpdateOrgXDomain, withTrimXDomain, withLegend, withEventRect, withDimension, withUpdateXAxis;
    var hideAxis = $$.hasArcType();
    var drawArea, drawBar, drawLine, xForText, yForText;
    var duration, durationForExit, durationForAxis;
    var transitionsToWait, waitForDraw, flow, transition;
    var targetsToShow = $$.filterTargetsToShow($$.data.targets),
        tickValues,
        i,
        intervalForCulling,
        xDomainForZoom;
    var xv = $$.xv.bind($$),
        cx,
        cy;
    options = options || {};
    withY = getOption(options, "withY", true);
    withSubchart = getOption(options, "withSubchart", true);
    withTransition = getOption(options, "withTransition", true);
    withTransform = getOption(options, "withTransform", false);
    withUpdateXDomain = getOption(options, "withUpdateXDomain", false);
    withUpdateOrgXDomain = getOption(options, "withUpdateOrgXDomain", false);
    withTrimXDomain = getOption(options, "withTrimXDomain", true);
    withUpdateXAxis = getOption(options, "withUpdateXAxis", withUpdateXDomain);
    withLegend = getOption(options, "withLegend", false);
    withEventRect = getOption(options, "withEventRect", true);
    withDimension = getOption(options, "withDimension", true);
    withTransitionForExit = getOption(options, "withTransitionForExit", withTransition);
    withTransitionForAxis = getOption(options, "withTransitionForAxis", withTransition);
    duration = withTransition ? config.transition_duration : 0;
    durationForExit = withTransitionForExit ? duration : 0;
    durationForAxis = withTransitionForAxis ? duration : 0;
    transitions = transitions || $$.axis.generateTransitions(durationForAxis); // update legend and transform each g

    if (withLegend && config.legend_show) {
      $$.updateLegend($$.mapToIds($$.data.targets), options, transitions);
    } else if (withDimension) {
      // need to update dimension (e.g. axis.y.tick.values) because y tick values should change
      // no need to update axis in it because they will be updated in redraw()
      $$.updateDimension(true);
    } // MEMO: needed for grids calculation


    if ($$.isCategorized() && targetsToShow.length === 0) {
      $$.x.domain([0, $$.axes.x.selectAll('.tick').size()]);
    }

    if (targetsToShow.length) {
      $$.updateXDomain(targetsToShow, withUpdateXDomain, withUpdateOrgXDomain, withTrimXDomain);

      if (!config.axis_x_tick_values) {
        tickValues = $$.axis.updateXAxisTickValues(targetsToShow);
      }
    } else {
      $$.xAxis.tickValues([]);
      $$.subXAxis.tickValues([]);
    }

    if (config.zoom_rescale && !options.flow) {
      xDomainForZoom = $$.x.orgDomain();
    }

    $$.y.domain($$.getYDomain(targetsToShow, 'y', xDomainForZoom));
    $$.y2.domain($$.getYDomain(targetsToShow, 'y2', xDomainForZoom));

    if (!config.axis_y_tick_values && config.axis_y_tick_count) {
      $$.yAxis.tickValues($$.axis.generateTickValues($$.y.domain(), config.axis_y_tick_count));
    }

    if (!config.axis_y2_tick_values && config.axis_y2_tick_count) {
      $$.y2Axis.tickValues($$.axis.generateTickValues($$.y2.domain(), config.axis_y2_tick_count));
    } // axes


    $$.axis.redraw(durationForAxis, hideAxis); // Update axis label

    $$.axis.updateLabels(withTransition); // show/hide if manual culling needed

    if ((withUpdateXDomain || withUpdateXAxis) && targetsToShow.length) {
      if (config.axis_x_tick_culling && tickValues) {
        for (i = 1; i < tickValues.length; i++) {
          if (tickValues.length / i < config.axis_x_tick_culling_max) {
            intervalForCulling = i;
            break;
          }
        }

        $$.svg.selectAll('.' + CLASS.axisX + ' .tick text').each(function (e) {
          var index = tickValues.indexOf(e);

          if (index >= 0) {
            d3.select(this).style('display', index % intervalForCulling ? 'none' : 'block');
          }
        });
      } else {
        $$.svg.selectAll('.' + CLASS.axisX + ' .tick text').style('display', 'block');
      }
    } // setup drawer - MEMO: these must be called after axis updated


    drawArea = $$.generateDrawArea ? $$.generateDrawArea(areaIndices, false) : undefined;
    drawBar = $$.generateDrawBar ? $$.generateDrawBar(barIndices) : undefined;
    drawLine = $$.generateDrawLine ? $$.generateDrawLine(lineIndices, false) : undefined;
    xForText = $$.generateXYForText(areaIndices, barIndices, lineIndices, true);
    yForText = $$.generateXYForText(areaIndices, barIndices, lineIndices, false); // update circleY based on updated parameters

    $$.updateCircleY(); // generate circle x/y functions depending on updated params

    cx = ($$.config.axis_rotated ? $$.circleY : $$.circleX).bind($$);
    cy = ($$.config.axis_rotated ? $$.circleX : $$.circleY).bind($$); // Update sub domain

    if (withY) {
      $$.subY.domain($$.getYDomain(targetsToShow, 'y'));
      $$.subY2.domain($$.getYDomain(targetsToShow, 'y2'));
    } // xgrid focus


    $$.updateXgridFocus(); // Data empty label positioning and text.

    main.select("text." + CLASS.text + '.' + CLASS.empty).attr("x", $$.width / 2).attr("y", $$.height / 2).text(config.data_empty_label_text).transition().style('opacity', targetsToShow.length ? 0 : 1); // event rect

    if (withEventRect) {
      $$.redrawEventRect();
    } // grid


    $$.updateGrid(duration);
    $$.updateStanfordElements(duration); // rect for regions

    $$.updateRegion(duration); // bars

    $$.updateBar(durationForExit); // lines, areas and circles

    $$.updateLine(durationForExit);
    $$.updateArea(durationForExit);
    $$.updateCircle(cx, cy); // text

    if ($$.hasDataLabel()) {
      $$.updateText(xForText, yForText, durationForExit);
    } // title


    if ($$.redrawTitle) {
      $$.redrawTitle();
    } // arc


    if ($$.redrawArc) {
      $$.redrawArc(duration, durationForExit, withTransform);
    } // subchart


    if (config.subchart_show && $$.redrawSubchart) {
      $$.redrawSubchart(withSubchart, transitions, duration, durationForExit, areaIndices, barIndices, lineIndices);
    }

    if ($$.isStanfordGraphType()) {
      $$.drawColorScale();
    } // circles for select


    main.selectAll('.' + CLASS.selectedCircles).filter($$.isBarType.bind($$)).selectAll('circle').remove();

    if (options.flow) {
      flow = $$.generateFlow({
        targets: targetsToShow,
        flow: options.flow,
        duration: options.flow.duration,
        drawBar: drawBar,
        drawLine: drawLine,
        drawArea: drawArea,
        cx: cx,
        cy: cy,
        xv: xv,
        xForText: xForText,
        yForText: yForText
      });
    }

    if (duration && $$.isTabVisible()) {
      // Only use transition if tab visible. See #938.
      // transition should be derived from one transition
      transition = d3.transition().duration(duration);
      transitionsToWait = [];
      [$$.redrawBar(drawBar, true, transition), $$.redrawLine(drawLine, true, transition), $$.redrawArea(drawArea, true, transition), $$.redrawCircle(cx, cy, true, transition), $$.redrawText(xForText, yForText, options.flow, true, transition), $$.redrawRegion(true, transition), $$.redrawGrid(true, transition)].forEach(function (transitions) {
        transitions.forEach(function (transition) {
          transitionsToWait.push(transition);
        });
      }); // Wait for end of transitions to call flow and onrendered callback

      waitForDraw = $$.generateWait();
      transitionsToWait.forEach(function (t) {
        waitForDraw.add(t);
      });
      waitForDraw(function () {
        if (flow) {
          flow();
        }

        if (config.onrendered) {
          config.onrendered.call($$);
        }
      });
    } else {
      $$.redrawBar(drawBar);
      $$.redrawLine(drawLine);
      $$.redrawArea(drawArea);
      $$.redrawCircle(cx, cy);
      $$.redrawText(xForText, yForText, options.flow);
      $$.redrawRegion();
      $$.redrawGrid();

      if (flow) {
        flow();
      }

      if (config.onrendered) {
        config.onrendered.call($$);
      }
    } // update fadein condition


    $$.mapToIds($$.data.targets).forEach(function (id) {
      $$.withoutFadeIn[id] = true;
    });
  };

  ChartInternal.prototype.updateAndRedraw = function (options) {
    var $$ = this,
        config = $$.config,
        transitions;
    options = options || {}; // same with redraw

    options.withTransition = getOption(options, "withTransition", true);
    options.withTransform = getOption(options, "withTransform", false);
    options.withLegend = getOption(options, "withLegend", false); // NOT same with redraw

    options.withUpdateXDomain = getOption(options, "withUpdateXDomain", true);
    options.withUpdateOrgXDomain = getOption(options, "withUpdateOrgXDomain", true);
    options.withTransitionForExit = false;
    options.withTransitionForTransform = getOption(options, "withTransitionForTransform", options.withTransition); // MEMO: this needs to be called before updateLegend and it means this ALWAYS needs to be called)

    $$.updateSizes(); // MEMO: called in updateLegend in redraw if withLegend

    if (!(options.withLegend && config.legend_show)) {
      transitions = $$.axis.generateTransitions(options.withTransitionForAxis ? config.transition_duration : 0); // Update scales

      $$.updateScales();
      $$.updateSvgSize(); // Update g positions

      $$.transformAll(options.withTransitionForTransform, transitions);
    } // Draw with new sizes & scales


    $$.redraw(options, transitions);
  };

  ChartInternal.prototype.redrawWithoutRescale = function () {
    this.redraw({
      withY: false,
      withSubchart: false,
      withEventRect: false,
      withTransitionForAxis: false
    });
  };

  ChartInternal.prototype.isTimeSeries = function () {
    return this.config.axis_x_type === 'timeseries';
  };

  ChartInternal.prototype.isCategorized = function () {
    return this.config.axis_x_type.indexOf('categor') >= 0;
  };

  ChartInternal.prototype.isCustomX = function () {
    var $$ = this,
        config = $$.config;
    return !$$.isTimeSeries() && (config.data_x || notEmpty(config.data_xs));
  };

  ChartInternal.prototype.isTimeSeriesY = function () {
    return this.config.axis_y_type === 'timeseries';
  };

  ChartInternal.prototype.getTranslate = function (target) {
    var $$ = this,
        config = $$.config,
        x,
        y;

    if (target === 'main') {
      x = asHalfPixel($$.margin.left);
      y = asHalfPixel($$.margin.top);
    } else if (target === 'context') {
      x = asHalfPixel($$.margin2.left);
      y = asHalfPixel($$.margin2.top);
    } else if (target === 'legend') {
      x = $$.margin3.left;
      y = $$.margin3.top;
    } else if (target === 'x') {
      x = 0;
      y = config.axis_rotated ? 0 : $$.height;
    } else if (target === 'y') {
      x = 0;
      y = config.axis_rotated ? $$.height : 0;
    } else if (target === 'y2') {
      x = config.axis_rotated ? 0 : $$.width;
      y = config.axis_rotated ? 1 : 0;
    } else if (target === 'subx') {
      x = 0;
      y = config.axis_rotated ? 0 : $$.height2;
    } else if (target === 'arc') {
      x = $$.arcWidth / 2;
      y = $$.arcHeight / 2 - ($$.hasType('gauge') ? 6 : 0); // to prevent wrong display of min and max label
    }

    return "translate(" + x + "," + y + ")";
  };

  ChartInternal.prototype.initialOpacity = function (d) {
    return d.value !== null && this.withoutFadeIn[d.id] ? 1 : 0;
  };

  ChartInternal.prototype.initialOpacityForCircle = function (d) {
    return d.value !== null && this.withoutFadeIn[d.id] ? this.opacityForCircle(d) : 0;
  };

  ChartInternal.prototype.opacityForCircle = function (d) {
    var isPointShouldBeShown = isFunction(this.config.point_show) ? this.config.point_show(d) : this.config.point_show;
    var opacity = isPointShouldBeShown || this.isStanfordType(d) ? 1 : 0;
    return isValue(d.value) ? this.isScatterType(d) ? 0.5 : opacity : 0;
  };

  ChartInternal.prototype.opacityForText = function () {
    return this.hasDataLabel() ? 1 : 0;
  };

  ChartInternal.prototype.xx = function (d) {
    return d ? this.x(d.x) : null;
  };

  ChartInternal.prototype.xvCustom = function (d, xyValue) {
    var $$ = this,
        value = xyValue ? d[xyValue] : d.value;

    if ($$.isTimeSeries()) {
      value = $$.parseDate(d.value);
    } else if ($$.isCategorized() && typeof d.value === 'string') {
      value = $$.config.axis_x_categories.indexOf(d.value);
    }

    return Math.ceil($$.x(value));
  };

  ChartInternal.prototype.yvCustom = function (d, xyValue) {
    var $$ = this,
        yScale = d.axis && d.axis === 'y2' ? $$.y2 : $$.y,
        value = xyValue ? d[xyValue] : d.value;
    return Math.ceil(yScale(value));
  };

  ChartInternal.prototype.xv = function (d) {
    var $$ = this,
        value = d.value;

    if ($$.isTimeSeries()) {
      value = $$.parseDate(d.value);
    } else if ($$.isCategorized() && typeof d.value === 'string') {
      value = $$.config.axis_x_categories.indexOf(d.value);
    }

    return Math.ceil($$.x(value));
  };

  ChartInternal.prototype.yv = function (d) {
    var $$ = this,
        yScale = d.axis && d.axis === 'y2' ? $$.y2 : $$.y;
    return Math.ceil(yScale(d.value));
  };

  ChartInternal.prototype.subxx = function (d) {
    return d ? this.subX(d.x) : null;
  };

  ChartInternal.prototype.transformMain = function (withTransition, transitions) {
    var $$ = this,
        xAxis,
        yAxis,
        y2Axis;

    if (transitions && transitions.axisX) {
      xAxis = transitions.axisX;
    } else {
      xAxis = $$.main.select('.' + CLASS.axisX);

      if (withTransition) {
        xAxis = xAxis.transition();
      }
    }

    if (transitions && transitions.axisY) {
      yAxis = transitions.axisY;
    } else {
      yAxis = $$.main.select('.' + CLASS.axisY);

      if (withTransition) {
        yAxis = yAxis.transition();
      }
    }

    if (transitions && transitions.axisY2) {
      y2Axis = transitions.axisY2;
    } else {
      y2Axis = $$.main.select('.' + CLASS.axisY2);

      if (withTransition) {
        y2Axis = y2Axis.transition();
      }
    }

    (withTransition ? $$.main.transition() : $$.main).attr("transform", $$.getTranslate('main'));
    xAxis.attr("transform", $$.getTranslate('x'));
    yAxis.attr("transform", $$.getTranslate('y'));
    y2Axis.attr("transform", $$.getTranslate('y2'));
    $$.main.select('.' + CLASS.chartArcs).attr("transform", $$.getTranslate('arc'));
  };

  ChartInternal.prototype.transformAll = function (withTransition, transitions) {
    var $$ = this;
    $$.transformMain(withTransition, transitions);

    if ($$.config.subchart_show) {
      $$.transformContext(withTransition, transitions);
    }

    if ($$.legend) {
      $$.transformLegend(withTransition);
    }
  };

  ChartInternal.prototype.updateSvgSize = function () {
    var $$ = this,
        brush = $$.svg.select(".".concat(CLASS.brush, " .overlay"));
    $$.svg.attr('width', $$.currentWidth).attr('height', $$.currentHeight);
    $$.svg.selectAll(['#' + $$.clipId, '#' + $$.clipIdForGrid]).select('rect').attr('width', $$.width).attr('height', $$.height);
    $$.svg.select('#' + $$.clipIdForXAxis).select('rect').attr('x', $$.getXAxisClipX.bind($$)).attr('y', $$.getXAxisClipY.bind($$)).attr('width', $$.getXAxisClipWidth.bind($$)).attr('height', $$.getXAxisClipHeight.bind($$));
    $$.svg.select('#' + $$.clipIdForYAxis).select('rect').attr('x', $$.getYAxisClipX.bind($$)).attr('y', $$.getYAxisClipY.bind($$)).attr('width', $$.getYAxisClipWidth.bind($$)).attr('height', $$.getYAxisClipHeight.bind($$));
    $$.svg.select('#' + $$.clipIdForSubchart).select('rect').attr('width', $$.width).attr('height', brush.size() && brush.attr('height') || 0); // MEMO: parent div's height will be bigger than svg when <!DOCTYPE html>

    $$.selectChart.style('max-height', $$.currentHeight + "px");
  };

  ChartInternal.prototype.updateDimension = function (withoutAxis) {
    var $$ = this;

    if (!withoutAxis) {
      if ($$.config.axis_rotated) {
        $$.axes.x.call($$.xAxis);
        $$.axes.subx.call($$.subXAxis);
      } else {
        $$.axes.y.call($$.yAxis);
        $$.axes.y2.call($$.y2Axis);
      }
    }

    $$.updateSizes();
    $$.updateScales();
    $$.updateSvgSize();
    $$.transformAll(false);
  };

  ChartInternal.prototype.observeInserted = function (selection) {
    var $$ = this,
        observer;

    if (typeof MutationObserver === 'undefined') {
      window.console.error("MutationObserver not defined.");
      return;
    }

    observer = new MutationObserver(function (mutations) {
      mutations.forEach(function (mutation) {
        if (mutation.type === 'childList' && mutation.previousSibling) {
          observer.disconnect(); // need to wait for completion of load because size calculation requires the actual sizes determined after that completion

          $$.intervalForObserveInserted = window.setInterval(function () {
            // parentNode will NOT be null when completed
            if (selection.node().parentNode) {
              window.clearInterval($$.intervalForObserveInserted);
              $$.updateDimension();

              if ($$.brush) {
                $$.brush.update();
              }

              $$.config.oninit.call($$);
              $$.redraw({
                withTransform: true,
                withUpdateXDomain: true,
                withUpdateOrgXDomain: true,
                withTransition: false,
                withTransitionForTransform: false,
                withLegend: true
              });
              selection.transition().style('opacity', 1);
            }
          }, 10);
        }
      });
    });
    observer.observe(selection.node(), {
      attributes: true,
      childList: true,
      characterData: true
    });
  };
  /**
   * Binds handlers to the window resize event.
   */


  ChartInternal.prototype.bindResize = function () {
    var $$ = this,
        config = $$.config;
    $$.resizeFunction = $$.generateResize(); // need to call .remove

    $$.resizeFunction.add(function () {
      config.onresize.call($$);
    });

    if (config.resize_auto) {
      $$.resizeFunction.add(function () {
        if ($$.resizeTimeout !== undefined) {
          window.clearTimeout($$.resizeTimeout);
        }

        $$.resizeTimeout = window.setTimeout(function () {
          delete $$.resizeTimeout;
          $$.updateAndRedraw({
            withUpdateXDomain: false,
            withUpdateOrgXDomain: false,
            withTransition: false,
            withTransitionForTransform: false,
            withLegend: true
          });

          if ($$.brush) {
            $$.brush.update();
          }
        }, 100);
      });
    }

    $$.resizeFunction.add(function () {
      config.onresized.call($$);
    });

    $$.resizeIfElementDisplayed = function () {
      // if element not displayed skip it
      if ($$.api == null || !$$.api.element.offsetParent) {
        return;
      }

      $$.resizeFunction();
    };

    if (window.attachEvent) {
      window.attachEvent('onresize', $$.resizeIfElementDisplayed);
    } else if (window.addEventListener) {
      window.addEventListener('resize', $$.resizeIfElementDisplayed, false);
    } else {
      // fallback to this, if this is a very old browser
      var wrapper = window.onresize;

      if (!wrapper) {
        // create a wrapper that will call all charts
        wrapper = $$.generateResize();
      } else if (!wrapper.add || !wrapper.remove) {
        // there is already a handler registered, make sure we call it too
        wrapper = $$.generateResize();
        wrapper.add(window.onresize);
      } // add this graph to the wrapper, we will be removed if the user calls destroy


      wrapper.add($$.resizeFunction);

      window.onresize = function () {
        // if element not displayed skip it
        if (!$$.api.element.offsetParent) {
          return;
        }

        wrapper();
      };
    }
  };
  /**
   * Binds handlers to the window focus event.
   */


  ChartInternal.prototype.bindWindowFocus = function () {
    var _this = this;

    if (this.windowFocusHandler) {
      // The handler is already set
      return;
    }

    this.windowFocusHandler = function () {
      _this.redraw();
    };

    window.addEventListener('focus', this.windowFocusHandler);
  };
  /**
   * Unbinds from the window focus event.
   */


  ChartInternal.prototype.unbindWindowFocus = function () {
    window.removeEventListener('focus', this.windowFocusHandler);
    delete this.windowFocusHandler;
  };

  ChartInternal.prototype.generateResize = function () {
    var resizeFunctions = [];

    function callResizeFunctions() {
      resizeFunctions.forEach(function (f) {
        f();
      });
    }

    callResizeFunctions.add = function (f) {
      resizeFunctions.push(f);
    };

    callResizeFunctions.remove = function (f) {
      for (var i = 0; i < resizeFunctions.length; i++) {
        if (resizeFunctions[i] === f) {
          resizeFunctions.splice(i, 1);
          break;
        }
      }
    };

    return callResizeFunctions;
  };

  ChartInternal.prototype.endall = function (transition, callback) {
    var n = 0;
    transition.each(function () {
      ++n;
    }).on("end", function () {
      if (! --n) {
        callback.apply(this, arguments);
      }
    });
  };

  ChartInternal.prototype.generateWait = function () {
    var $$ = this;

    var transitionsToWait = [],
        f = function f(callback) {
      var timer = setInterval(function () {
        if (!$$.isTabVisible()) {
          return;
        }

        var done = 0;
        transitionsToWait.forEach(function (t) {
          if (t.empty()) {
            done += 1;
            return;
          }

          try {
            t.transition();
          } catch (e) {
            done += 1;
          }
        });

        if (done === transitionsToWait.length) {
          clearInterval(timer);

          if (callback) {
            callback();
          }
        }
      }, 50);
    };

    f.add = function (transition) {
      transitionsToWait.push(transition);
    };

    return f;
  };

  ChartInternal.prototype.parseDate = function (date) {
    var $$ = this,
        parsedDate;

    if (date instanceof Date) {
      parsedDate = date;
    } else if (typeof date === 'string') {
      parsedDate = $$.dataTimeParse(date);
    } else if (_typeof(date) === 'object') {
      parsedDate = new Date(+date);
    } else if (typeof date === 'number' && !isNaN(date)) {
      parsedDate = new Date(+date);
    }

    if (!parsedDate || isNaN(+parsedDate)) {
      window.console.error("Failed to parse x '" + date + "' to Date object");
    }

    return parsedDate;
  };

  ChartInternal.prototype.isTabVisible = function () {
    return !document.hidden;
  };

  ChartInternal.prototype.getPathBox = getPathBox;
  ChartInternal.prototype.CLASS = CLASS;

  /* jshint ignore:start */
  // SVGPathSeg API polyfill
  // https://github.com/progers/pathseg
  //
  // This is a drop-in replacement for the SVGPathSeg and SVGPathSegList APIs that were removed from
  // SVG2 (https://lists.w3.org/Archives/Public/www-svg/2015Jun/0044.html), including the latest spec
  // changes which were implemented in Firefox 43 and Chrome 46.
  (function () {

    if (!("SVGPathSeg" in window)) {
      // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-InterfaceSVGPathSeg
      window.SVGPathSeg = function (type, typeAsLetter, owningPathSegList) {
        this.pathSegType = type;
        this.pathSegTypeAsLetter = typeAsLetter;
        this._owningPathSegList = owningPathSegList;
      };

      window.SVGPathSeg.prototype.classname = "SVGPathSeg";
      window.SVGPathSeg.PATHSEG_UNKNOWN = 0;
      window.SVGPathSeg.PATHSEG_CLOSEPATH = 1;
      window.SVGPathSeg.PATHSEG_MOVETO_ABS = 2;
      window.SVGPathSeg.PATHSEG_MOVETO_REL = 3;
      window.SVGPathSeg.PATHSEG_LINETO_ABS = 4;
      window.SVGPathSeg.PATHSEG_LINETO_REL = 5;
      window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS = 6;
      window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL = 7;
      window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS = 8;
      window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL = 9;
      window.SVGPathSeg.PATHSEG_ARC_ABS = 10;
      window.SVGPathSeg.PATHSEG_ARC_REL = 11;
      window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS = 12;
      window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL = 13;
      window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS = 14;
      window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL = 15;
      window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS = 16;
      window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL = 17;
      window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS = 18;
      window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL = 19; // Notify owning PathSegList on any changes so they can be synchronized back to the path element.

      window.SVGPathSeg.prototype._segmentChanged = function () {
        if (this._owningPathSegList) this._owningPathSegList.segmentChanged(this);
      };

      window.SVGPathSegClosePath = function (owningPathSegList) {
        window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CLOSEPATH, "z", owningPathSegList);
      };

      window.SVGPathSegClosePath.prototype = Object.create(window.SVGPathSeg.prototype);

      window.SVGPathSegClosePath.prototype.toString = function () {
        return "[object SVGPathSegClosePath]";
      };

      window.SVGPathSegClosePath.prototype._asPathString = function () {
        return this.pathSegTypeAsLetter;
      };

      window.SVGPathSegClosePath.prototype.clone = function () {
        return new window.SVGPathSegClosePath(undefined);
      };

      window.SVGPathSegMovetoAbs = function (owningPathSegList, x, y) {
        window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_MOVETO_ABS, "M", owningPathSegList);
        this._x = x;
        this._y = y;
      };

      window.SVGPathSegMovetoAbs.prototype = Object.create(window.SVGPathSeg.prototype);

      window.SVGPathSegMovetoAbs.prototype.toString = function () {
        return "[object SVGPathSegMovetoAbs]";
      };

      window.SVGPathSegMovetoAbs.prototype._asPathString = function () {
        return this.pathSegTypeAsLetter + " " + this._x + " " + this._y;
      };

      window.SVGPathSegMovetoAbs.prototype.clone = function () {
        return new window.SVGPathSegMovetoAbs(undefined, this._x, this._y);
      };

      Object.defineProperty(window.SVGPathSegMovetoAbs.prototype, "x", {
        get: function get() {
          return this._x;
        },
        set: function set(x) {
          this._x = x;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegMovetoAbs.prototype, "y", {
        get: function get() {
          return this._y;
        },
        set: function set(y) {
          this._y = y;

          this._segmentChanged();
        },
        enumerable: true
      });

      window.SVGPathSegMovetoRel = function (owningPathSegList, x, y) {
        window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_MOVETO_REL, "m", owningPathSegList);
        this._x = x;
        this._y = y;
      };

      window.SVGPathSegMovetoRel.prototype = Object.create(window.SVGPathSeg.prototype);

      window.SVGPathSegMovetoRel.prototype.toString = function () {
        return "[object SVGPathSegMovetoRel]";
      };

      window.SVGPathSegMovetoRel.prototype._asPathString = function () {
        return this.pathSegTypeAsLetter + " " + this._x + " " + this._y;
      };

      window.SVGPathSegMovetoRel.prototype.clone = function () {
        return new window.SVGPathSegMovetoRel(undefined, this._x, this._y);
      };

      Object.defineProperty(window.SVGPathSegMovetoRel.prototype, "x", {
        get: function get() {
          return this._x;
        },
        set: function set(x) {
          this._x = x;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegMovetoRel.prototype, "y", {
        get: function get() {
          return this._y;
        },
        set: function set(y) {
          this._y = y;

          this._segmentChanged();
        },
        enumerable: true
      });

      window.SVGPathSegLinetoAbs = function (owningPathSegList, x, y) {
        window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_ABS, "L", owningPathSegList);
        this._x = x;
        this._y = y;
      };

      window.SVGPathSegLinetoAbs.prototype = Object.create(window.SVGPathSeg.prototype);

      window.SVGPathSegLinetoAbs.prototype.toString = function () {
        return "[object SVGPathSegLinetoAbs]";
      };

      window.SVGPathSegLinetoAbs.prototype._asPathString = function () {
        return this.pathSegTypeAsLetter + " " + this._x + " " + this._y;
      };

      window.SVGPathSegLinetoAbs.prototype.clone = function () {
        return new window.SVGPathSegLinetoAbs(undefined, this._x, this._y);
      };

      Object.defineProperty(window.SVGPathSegLinetoAbs.prototype, "x", {
        get: function get() {
          return this._x;
        },
        set: function set(x) {
          this._x = x;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegLinetoAbs.prototype, "y", {
        get: function get() {
          return this._y;
        },
        set: function set(y) {
          this._y = y;

          this._segmentChanged();
        },
        enumerable: true
      });

      window.SVGPathSegLinetoRel = function (owningPathSegList, x, y) {
        window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_REL, "l", owningPathSegList);
        this._x = x;
        this._y = y;
      };

      window.SVGPathSegLinetoRel.prototype = Object.create(window.SVGPathSeg.prototype);

      window.SVGPathSegLinetoRel.prototype.toString = function () {
        return "[object SVGPathSegLinetoRel]";
      };

      window.SVGPathSegLinetoRel.prototype._asPathString = function () {
        return this.pathSegTypeAsLetter + " " + this._x + " " + this._y;
      };

      window.SVGPathSegLinetoRel.prototype.clone = function () {
        return new window.SVGPathSegLinetoRel(undefined, this._x, this._y);
      };

      Object.defineProperty(window.SVGPathSegLinetoRel.prototype, "x", {
        get: function get() {
          return this._x;
        },
        set: function set(x) {
          this._x = x;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegLinetoRel.prototype, "y", {
        get: function get() {
          return this._y;
        },
        set: function set(y) {
          this._y = y;

          this._segmentChanged();
        },
        enumerable: true
      });

      window.SVGPathSegCurvetoCubicAbs = function (owningPathSegList, x, y, x1, y1, x2, y2) {
        window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS, "C", owningPathSegList);
        this._x = x;
        this._y = y;
        this._x1 = x1;
        this._y1 = y1;
        this._x2 = x2;
        this._y2 = y2;
      };

      window.SVGPathSegCurvetoCubicAbs.prototype = Object.create(window.SVGPathSeg.prototype);

      window.SVGPathSegCurvetoCubicAbs.prototype.toString = function () {
        return "[object SVGPathSegCurvetoCubicAbs]";
      };

      window.SVGPathSegCurvetoCubicAbs.prototype._asPathString = function () {
        return this.pathSegTypeAsLetter + " " + this._x1 + " " + this._y1 + " " + this._x2 + " " + this._y2 + " " + this._x + " " + this._y;
      };

      window.SVGPathSegCurvetoCubicAbs.prototype.clone = function () {
        return new window.SVGPathSegCurvetoCubicAbs(undefined, this._x, this._y, this._x1, this._y1, this._x2, this._y2);
      };

      Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, "x", {
        get: function get() {
          return this._x;
        },
        set: function set(x) {
          this._x = x;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, "y", {
        get: function get() {
          return this._y;
        },
        set: function set(y) {
          this._y = y;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, "x1", {
        get: function get() {
          return this._x1;
        },
        set: function set(x1) {
          this._x1 = x1;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, "y1", {
        get: function get() {
          return this._y1;
        },
        set: function set(y1) {
          this._y1 = y1;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, "x2", {
        get: function get() {
          return this._x2;
        },
        set: function set(x2) {
          this._x2 = x2;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoCubicAbs.prototype, "y2", {
        get: function get() {
          return this._y2;
        },
        set: function set(y2) {
          this._y2 = y2;

          this._segmentChanged();
        },
        enumerable: true
      });

      window.SVGPathSegCurvetoCubicRel = function (owningPathSegList, x, y, x1, y1, x2, y2) {
        window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL, "c", owningPathSegList);
        this._x = x;
        this._y = y;
        this._x1 = x1;
        this._y1 = y1;
        this._x2 = x2;
        this._y2 = y2;
      };

      window.SVGPathSegCurvetoCubicRel.prototype = Object.create(window.SVGPathSeg.prototype);

      window.SVGPathSegCurvetoCubicRel.prototype.toString = function () {
        return "[object SVGPathSegCurvetoCubicRel]";
      };

      window.SVGPathSegCurvetoCubicRel.prototype._asPathString = function () {
        return this.pathSegTypeAsLetter + " " + this._x1 + " " + this._y1 + " " + this._x2 + " " + this._y2 + " " + this._x + " " + this._y;
      };

      window.SVGPathSegCurvetoCubicRel.prototype.clone = function () {
        return new window.SVGPathSegCurvetoCubicRel(undefined, this._x, this._y, this._x1, this._y1, this._x2, this._y2);
      };

      Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, "x", {
        get: function get() {
          return this._x;
        },
        set: function set(x) {
          this._x = x;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, "y", {
        get: function get() {
          return this._y;
        },
        set: function set(y) {
          this._y = y;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, "x1", {
        get: function get() {
          return this._x1;
        },
        set: function set(x1) {
          this._x1 = x1;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, "y1", {
        get: function get() {
          return this._y1;
        },
        set: function set(y1) {
          this._y1 = y1;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, "x2", {
        get: function get() {
          return this._x2;
        },
        set: function set(x2) {
          this._x2 = x2;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoCubicRel.prototype, "y2", {
        get: function get() {
          return this._y2;
        },
        set: function set(y2) {
          this._y2 = y2;

          this._segmentChanged();
        },
        enumerable: true
      });

      window.SVGPathSegCurvetoQuadraticAbs = function (owningPathSegList, x, y, x1, y1) {
        window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS, "Q", owningPathSegList);
        this._x = x;
        this._y = y;
        this._x1 = x1;
        this._y1 = y1;
      };

      window.SVGPathSegCurvetoQuadraticAbs.prototype = Object.create(window.SVGPathSeg.prototype);

      window.SVGPathSegCurvetoQuadraticAbs.prototype.toString = function () {
        return "[object SVGPathSegCurvetoQuadraticAbs]";
      };

      window.SVGPathSegCurvetoQuadraticAbs.prototype._asPathString = function () {
        return this.pathSegTypeAsLetter + " " + this._x1 + " " + this._y1 + " " + this._x + " " + this._y;
      };

      window.SVGPathSegCurvetoQuadraticAbs.prototype.clone = function () {
        return new window.SVGPathSegCurvetoQuadraticAbs(undefined, this._x, this._y, this._x1, this._y1);
      };

      Object.defineProperty(window.SVGPathSegCurvetoQuadraticAbs.prototype, "x", {
        get: function get() {
          return this._x;
        },
        set: function set(x) {
          this._x = x;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoQuadraticAbs.prototype, "y", {
        get: function get() {
          return this._y;
        },
        set: function set(y) {
          this._y = y;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoQuadraticAbs.prototype, "x1", {
        get: function get() {
          return this._x1;
        },
        set: function set(x1) {
          this._x1 = x1;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoQuadraticAbs.prototype, "y1", {
        get: function get() {
          return this._y1;
        },
        set: function set(y1) {
          this._y1 = y1;

          this._segmentChanged();
        },
        enumerable: true
      });

      window.SVGPathSegCurvetoQuadraticRel = function (owningPathSegList, x, y, x1, y1) {
        window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL, "q", owningPathSegList);
        this._x = x;
        this._y = y;
        this._x1 = x1;
        this._y1 = y1;
      };

      window.SVGPathSegCurvetoQuadraticRel.prototype = Object.create(window.SVGPathSeg.prototype);

      window.SVGPathSegCurvetoQuadraticRel.prototype.toString = function () {
        return "[object SVGPathSegCurvetoQuadraticRel]";
      };

      window.SVGPathSegCurvetoQuadraticRel.prototype._asPathString = function () {
        return this.pathSegTypeAsLetter + " " + this._x1 + " " + this._y1 + " " + this._x + " " + this._y;
      };

      window.SVGPathSegCurvetoQuadraticRel.prototype.clone = function () {
        return new window.SVGPathSegCurvetoQuadraticRel(undefined, this._x, this._y, this._x1, this._y1);
      };

      Object.defineProperty(window.SVGPathSegCurvetoQuadraticRel.prototype, "x", {
        get: function get() {
          return this._x;
        },
        set: function set(x) {
          this._x = x;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoQuadraticRel.prototype, "y", {
        get: function get() {
          return this._y;
        },
        set: function set(y) {
          this._y = y;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoQuadraticRel.prototype, "x1", {
        get: function get() {
          return this._x1;
        },
        set: function set(x1) {
          this._x1 = x1;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoQuadraticRel.prototype, "y1", {
        get: function get() {
          return this._y1;
        },
        set: function set(y1) {
          this._y1 = y1;

          this._segmentChanged();
        },
        enumerable: true
      });

      window.SVGPathSegArcAbs = function (owningPathSegList, x, y, r1, r2, angle, largeArcFlag, sweepFlag) {
        window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_ARC_ABS, "A", owningPathSegList);
        this._x = x;
        this._y = y;
        this._r1 = r1;
        this._r2 = r2;
        this._angle = angle;
        this._largeArcFlag = largeArcFlag;
        this._sweepFlag = sweepFlag;
      };

      window.SVGPathSegArcAbs.prototype = Object.create(window.SVGPathSeg.prototype);

      window.SVGPathSegArcAbs.prototype.toString = function () {
        return "[object SVGPathSegArcAbs]";
      };

      window.SVGPathSegArcAbs.prototype._asPathString = function () {
        return this.pathSegTypeAsLetter + " " + this._r1 + " " + this._r2 + " " + this._angle + " " + (this._largeArcFlag ? "1" : "0") + " " + (this._sweepFlag ? "1" : "0") + " " + this._x + " " + this._y;
      };

      window.SVGPathSegArcAbs.prototype.clone = function () {
        return new window.SVGPathSegArcAbs(undefined, this._x, this._y, this._r1, this._r2, this._angle, this._largeArcFlag, this._sweepFlag);
      };

      Object.defineProperty(window.SVGPathSegArcAbs.prototype, "x", {
        get: function get() {
          return this._x;
        },
        set: function set(x) {
          this._x = x;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegArcAbs.prototype, "y", {
        get: function get() {
          return this._y;
        },
        set: function set(y) {
          this._y = y;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegArcAbs.prototype, "r1", {
        get: function get() {
          return this._r1;
        },
        set: function set(r1) {
          this._r1 = r1;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegArcAbs.prototype, "r2", {
        get: function get() {
          return this._r2;
        },
        set: function set(r2) {
          this._r2 = r2;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegArcAbs.prototype, "angle", {
        get: function get() {
          return this._angle;
        },
        set: function set(angle) {
          this._angle = angle;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegArcAbs.prototype, "largeArcFlag", {
        get: function get() {
          return this._largeArcFlag;
        },
        set: function set(largeArcFlag) {
          this._largeArcFlag = largeArcFlag;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegArcAbs.prototype, "sweepFlag", {
        get: function get() {
          return this._sweepFlag;
        },
        set: function set(sweepFlag) {
          this._sweepFlag = sweepFlag;

          this._segmentChanged();
        },
        enumerable: true
      });

      window.SVGPathSegArcRel = function (owningPathSegList, x, y, r1, r2, angle, largeArcFlag, sweepFlag) {
        window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_ARC_REL, "a", owningPathSegList);
        this._x = x;
        this._y = y;
        this._r1 = r1;
        this._r2 = r2;
        this._angle = angle;
        this._largeArcFlag = largeArcFlag;
        this._sweepFlag = sweepFlag;
      };

      window.SVGPathSegArcRel.prototype = Object.create(window.SVGPathSeg.prototype);

      window.SVGPathSegArcRel.prototype.toString = function () {
        return "[object SVGPathSegArcRel]";
      };

      window.SVGPathSegArcRel.prototype._asPathString = function () {
        return this.pathSegTypeAsLetter + " " + this._r1 + " " + this._r2 + " " + this._angle + " " + (this._largeArcFlag ? "1" : "0") + " " + (this._sweepFlag ? "1" : "0") + " " + this._x + " " + this._y;
      };

      window.SVGPathSegArcRel.prototype.clone = function () {
        return new window.SVGPathSegArcRel(undefined, this._x, this._y, this._r1, this._r2, this._angle, this._largeArcFlag, this._sweepFlag);
      };

      Object.defineProperty(window.SVGPathSegArcRel.prototype, "x", {
        get: function get() {
          return this._x;
        },
        set: function set(x) {
          this._x = x;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegArcRel.prototype, "y", {
        get: function get() {
          return this._y;
        },
        set: function set(y) {
          this._y = y;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegArcRel.prototype, "r1", {
        get: function get() {
          return this._r1;
        },
        set: function set(r1) {
          this._r1 = r1;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegArcRel.prototype, "r2", {
        get: function get() {
          return this._r2;
        },
        set: function set(r2) {
          this._r2 = r2;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegArcRel.prototype, "angle", {
        get: function get() {
          return this._angle;
        },
        set: function set(angle) {
          this._angle = angle;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegArcRel.prototype, "largeArcFlag", {
        get: function get() {
          return this._largeArcFlag;
        },
        set: function set(largeArcFlag) {
          this._largeArcFlag = largeArcFlag;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegArcRel.prototype, "sweepFlag", {
        get: function get() {
          return this._sweepFlag;
        },
        set: function set(sweepFlag) {
          this._sweepFlag = sweepFlag;

          this._segmentChanged();
        },
        enumerable: true
      });

      window.SVGPathSegLinetoHorizontalAbs = function (owningPathSegList, x) {
        window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS, "H", owningPathSegList);
        this._x = x;
      };

      window.SVGPathSegLinetoHorizontalAbs.prototype = Object.create(window.SVGPathSeg.prototype);

      window.SVGPathSegLinetoHorizontalAbs.prototype.toString = function () {
        return "[object SVGPathSegLinetoHorizontalAbs]";
      };

      window.SVGPathSegLinetoHorizontalAbs.prototype._asPathString = function () {
        return this.pathSegTypeAsLetter + " " + this._x;
      };

      window.SVGPathSegLinetoHorizontalAbs.prototype.clone = function () {
        return new window.SVGPathSegLinetoHorizontalAbs(undefined, this._x);
      };

      Object.defineProperty(window.SVGPathSegLinetoHorizontalAbs.prototype, "x", {
        get: function get() {
          return this._x;
        },
        set: function set(x) {
          this._x = x;

          this._segmentChanged();
        },
        enumerable: true
      });

      window.SVGPathSegLinetoHorizontalRel = function (owningPathSegList, x) {
        window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL, "h", owningPathSegList);
        this._x = x;
      };

      window.SVGPathSegLinetoHorizontalRel.prototype = Object.create(window.SVGPathSeg.prototype);

      window.SVGPathSegLinetoHorizontalRel.prototype.toString = function () {
        return "[object SVGPathSegLinetoHorizontalRel]";
      };

      window.SVGPathSegLinetoHorizontalRel.prototype._asPathString = function () {
        return this.pathSegTypeAsLetter + " " + this._x;
      };

      window.SVGPathSegLinetoHorizontalRel.prototype.clone = function () {
        return new window.SVGPathSegLinetoHorizontalRel(undefined, this._x);
      };

      Object.defineProperty(window.SVGPathSegLinetoHorizontalRel.prototype, "x", {
        get: function get() {
          return this._x;
        },
        set: function set(x) {
          this._x = x;

          this._segmentChanged();
        },
        enumerable: true
      });

      window.SVGPathSegLinetoVerticalAbs = function (owningPathSegList, y) {
        window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS, "V", owningPathSegList);
        this._y = y;
      };

      window.SVGPathSegLinetoVerticalAbs.prototype = Object.create(window.SVGPathSeg.prototype);

      window.SVGPathSegLinetoVerticalAbs.prototype.toString = function () {
        return "[object SVGPathSegLinetoVerticalAbs]";
      };

      window.SVGPathSegLinetoVerticalAbs.prototype._asPathString = function () {
        return this.pathSegTypeAsLetter + " " + this._y;
      };

      window.SVGPathSegLinetoVerticalAbs.prototype.clone = function () {
        return new window.SVGPathSegLinetoVerticalAbs(undefined, this._y);
      };

      Object.defineProperty(window.SVGPathSegLinetoVerticalAbs.prototype, "y", {
        get: function get() {
          return this._y;
        },
        set: function set(y) {
          this._y = y;

          this._segmentChanged();
        },
        enumerable: true
      });

      window.SVGPathSegLinetoVerticalRel = function (owningPathSegList, y) {
        window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL, "v", owningPathSegList);
        this._y = y;
      };

      window.SVGPathSegLinetoVerticalRel.prototype = Object.create(window.SVGPathSeg.prototype);

      window.SVGPathSegLinetoVerticalRel.prototype.toString = function () {
        return "[object SVGPathSegLinetoVerticalRel]";
      };

      window.SVGPathSegLinetoVerticalRel.prototype._asPathString = function () {
        return this.pathSegTypeAsLetter + " " + this._y;
      };

      window.SVGPathSegLinetoVerticalRel.prototype.clone = function () {
        return new window.SVGPathSegLinetoVerticalRel(undefined, this._y);
      };

      Object.defineProperty(window.SVGPathSegLinetoVerticalRel.prototype, "y", {
        get: function get() {
          return this._y;
        },
        set: function set(y) {
          this._y = y;

          this._segmentChanged();
        },
        enumerable: true
      });

      window.SVGPathSegCurvetoCubicSmoothAbs = function (owningPathSegList, x, y, x2, y2) {
        window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS, "S", owningPathSegList);
        this._x = x;
        this._y = y;
        this._x2 = x2;
        this._y2 = y2;
      };

      window.SVGPathSegCurvetoCubicSmoothAbs.prototype = Object.create(window.SVGPathSeg.prototype);

      window.SVGPathSegCurvetoCubicSmoothAbs.prototype.toString = function () {
        return "[object SVGPathSegCurvetoCubicSmoothAbs]";
      };

      window.SVGPathSegCurvetoCubicSmoothAbs.prototype._asPathString = function () {
        return this.pathSegTypeAsLetter + " " + this._x2 + " " + this._y2 + " " + this._x + " " + this._y;
      };

      window.SVGPathSegCurvetoCubicSmoothAbs.prototype.clone = function () {
        return new window.SVGPathSegCurvetoCubicSmoothAbs(undefined, this._x, this._y, this._x2, this._y2);
      };

      Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothAbs.prototype, "x", {
        get: function get() {
          return this._x;
        },
        set: function set(x) {
          this._x = x;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothAbs.prototype, "y", {
        get: function get() {
          return this._y;
        },
        set: function set(y) {
          this._y = y;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothAbs.prototype, "x2", {
        get: function get() {
          return this._x2;
        },
        set: function set(x2) {
          this._x2 = x2;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothAbs.prototype, "y2", {
        get: function get() {
          return this._y2;
        },
        set: function set(y2) {
          this._y2 = y2;

          this._segmentChanged();
        },
        enumerable: true
      });

      window.SVGPathSegCurvetoCubicSmoothRel = function (owningPathSegList, x, y, x2, y2) {
        window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL, "s", owningPathSegList);
        this._x = x;
        this._y = y;
        this._x2 = x2;
        this._y2 = y2;
      };

      window.SVGPathSegCurvetoCubicSmoothRel.prototype = Object.create(window.SVGPathSeg.prototype);

      window.SVGPathSegCurvetoCubicSmoothRel.prototype.toString = function () {
        return "[object SVGPathSegCurvetoCubicSmoothRel]";
      };

      window.SVGPathSegCurvetoCubicSmoothRel.prototype._asPathString = function () {
        return this.pathSegTypeAsLetter + " " + this._x2 + " " + this._y2 + " " + this._x + " " + this._y;
      };

      window.SVGPathSegCurvetoCubicSmoothRel.prototype.clone = function () {
        return new window.SVGPathSegCurvetoCubicSmoothRel(undefined, this._x, this._y, this._x2, this._y2);
      };

      Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothRel.prototype, "x", {
        get: function get() {
          return this._x;
        },
        set: function set(x) {
          this._x = x;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothRel.prototype, "y", {
        get: function get() {
          return this._y;
        },
        set: function set(y) {
          this._y = y;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothRel.prototype, "x2", {
        get: function get() {
          return this._x2;
        },
        set: function set(x2) {
          this._x2 = x2;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoCubicSmoothRel.prototype, "y2", {
        get: function get() {
          return this._y2;
        },
        set: function set(y2) {
          this._y2 = y2;

          this._segmentChanged();
        },
        enumerable: true
      });

      window.SVGPathSegCurvetoQuadraticSmoothAbs = function (owningPathSegList, x, y) {
        window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS, "T", owningPathSegList);
        this._x = x;
        this._y = y;
      };

      window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype = Object.create(window.SVGPathSeg.prototype);

      window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype.toString = function () {
        return "[object SVGPathSegCurvetoQuadraticSmoothAbs]";
      };

      window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype._asPathString = function () {
        return this.pathSegTypeAsLetter + " " + this._x + " " + this._y;
      };

      window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype.clone = function () {
        return new window.SVGPathSegCurvetoQuadraticSmoothAbs(undefined, this._x, this._y);
      };

      Object.defineProperty(window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype, "x", {
        get: function get() {
          return this._x;
        },
        set: function set(x) {
          this._x = x;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoQuadraticSmoothAbs.prototype, "y", {
        get: function get() {
          return this._y;
        },
        set: function set(y) {
          this._y = y;

          this._segmentChanged();
        },
        enumerable: true
      });

      window.SVGPathSegCurvetoQuadraticSmoothRel = function (owningPathSegList, x, y) {
        window.SVGPathSeg.call(this, window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL, "t", owningPathSegList);
        this._x = x;
        this._y = y;
      };

      window.SVGPathSegCurvetoQuadraticSmoothRel.prototype = Object.create(window.SVGPathSeg.prototype);

      window.SVGPathSegCurvetoQuadraticSmoothRel.prototype.toString = function () {
        return "[object SVGPathSegCurvetoQuadraticSmoothRel]";
      };

      window.SVGPathSegCurvetoQuadraticSmoothRel.prototype._asPathString = function () {
        return this.pathSegTypeAsLetter + " " + this._x + " " + this._y;
      };

      window.SVGPathSegCurvetoQuadraticSmoothRel.prototype.clone = function () {
        return new window.SVGPathSegCurvetoQuadraticSmoothRel(undefined, this._x, this._y);
      };

      Object.defineProperty(window.SVGPathSegCurvetoQuadraticSmoothRel.prototype, "x", {
        get: function get() {
          return this._x;
        },
        set: function set(x) {
          this._x = x;

          this._segmentChanged();
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathSegCurvetoQuadraticSmoothRel.prototype, "y", {
        get: function get() {
          return this._y;
        },
        set: function set(y) {
          this._y = y;

          this._segmentChanged();
        },
        enumerable: true
      }); // Add createSVGPathSeg* functions to window.SVGPathElement.
      // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-Interfacewindow.SVGPathElement.

      window.SVGPathElement.prototype.createSVGPathSegClosePath = function () {
        return new window.SVGPathSegClosePath(undefined);
      };

      window.SVGPathElement.prototype.createSVGPathSegMovetoAbs = function (x, y) {
        return new window.SVGPathSegMovetoAbs(undefined, x, y);
      };

      window.SVGPathElement.prototype.createSVGPathSegMovetoRel = function (x, y) {
        return new window.SVGPathSegMovetoRel(undefined, x, y);
      };

      window.SVGPathElement.prototype.createSVGPathSegLinetoAbs = function (x, y) {
        return new window.SVGPathSegLinetoAbs(undefined, x, y);
      };

      window.SVGPathElement.prototype.createSVGPathSegLinetoRel = function (x, y) {
        return new window.SVGPathSegLinetoRel(undefined, x, y);
      };

      window.SVGPathElement.prototype.createSVGPathSegCurvetoCubicAbs = function (x, y, x1, y1, x2, y2) {
        return new window.SVGPathSegCurvetoCubicAbs(undefined, x, y, x1, y1, x2, y2);
      };

      window.SVGPathElement.prototype.createSVGPathSegCurvetoCubicRel = function (x, y, x1, y1, x2, y2) {
        return new window.SVGPathSegCurvetoCubicRel(undefined, x, y, x1, y1, x2, y2);
      };

      window.SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticAbs = function (x, y, x1, y1) {
        return new window.SVGPathSegCurvetoQuadraticAbs(undefined, x, y, x1, y1);
      };

      window.SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticRel = function (x, y, x1, y1) {
        return new window.SVGPathSegCurvetoQuadraticRel(undefined, x, y, x1, y1);
      };

      window.SVGPathElement.prototype.createSVGPathSegArcAbs = function (x, y, r1, r2, angle, largeArcFlag, sweepFlag) {
        return new window.SVGPathSegArcAbs(undefined, x, y, r1, r2, angle, largeArcFlag, sweepFlag);
      };

      window.SVGPathElement.prototype.createSVGPathSegArcRel = function (x, y, r1, r2, angle, largeArcFlag, sweepFlag) {
        return new window.SVGPathSegArcRel(undefined, x, y, r1, r2, angle, largeArcFlag, sweepFlag);
      };

      window.SVGPathElement.prototype.createSVGPathSegLinetoHorizontalAbs = function (x) {
        return new window.SVGPathSegLinetoHorizontalAbs(undefined, x);
      };

      window.SVGPathElement.prototype.createSVGPathSegLinetoHorizontalRel = function (x) {
        return new window.SVGPathSegLinetoHorizontalRel(undefined, x);
      };

      window.SVGPathElement.prototype.createSVGPathSegLinetoVerticalAbs = function (y) {
        return new window.SVGPathSegLinetoVerticalAbs(undefined, y);
      };

      window.SVGPathElement.prototype.createSVGPathSegLinetoVerticalRel = function (y) {
        return new window.SVGPathSegLinetoVerticalRel(undefined, y);
      };

      window.SVGPathElement.prototype.createSVGPathSegCurvetoCubicSmoothAbs = function (x, y, x2, y2) {
        return new window.SVGPathSegCurvetoCubicSmoothAbs(undefined, x, y, x2, y2);
      };

      window.SVGPathElement.prototype.createSVGPathSegCurvetoCubicSmoothRel = function (x, y, x2, y2) {
        return new window.SVGPathSegCurvetoCubicSmoothRel(undefined, x, y, x2, y2);
      };

      window.SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticSmoothAbs = function (x, y) {
        return new window.SVGPathSegCurvetoQuadraticSmoothAbs(undefined, x, y);
      };

      window.SVGPathElement.prototype.createSVGPathSegCurvetoQuadraticSmoothRel = function (x, y) {
        return new window.SVGPathSegCurvetoQuadraticSmoothRel(undefined, x, y);
      };

      if (!("getPathSegAtLength" in window.SVGPathElement.prototype)) {
        // Add getPathSegAtLength to SVGPathElement.
        // Spec: https://www.w3.org/TR/SVG11/single-page.html#paths-__svg__SVGPathElement__getPathSegAtLength
        // This polyfill requires SVGPathElement.getTotalLength to implement the distance-along-a-path algorithm.
        window.SVGPathElement.prototype.getPathSegAtLength = function (distance) {
          if (distance === undefined || !isFinite(distance)) throw "Invalid arguments.";
          var measurementElement = document.createElementNS("http://www.w3.org/2000/svg", "path");
          measurementElement.setAttribute("d", this.getAttribute("d"));
          var lastPathSegment = measurementElement.pathSegList.numberOfItems - 1; // If the path is empty, return 0.

          if (lastPathSegment <= 0) return 0;

          do {
            measurementElement.pathSegList.removeItem(lastPathSegment);
            if (distance > measurementElement.getTotalLength()) break;
            lastPathSegment--;
          } while (lastPathSegment > 0);

          return lastPathSegment;
        };
      }
    }

    if (!("SVGPathSegList" in window)) {
      // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-InterfaceSVGPathSegList
      window.SVGPathSegList = function (pathElement) {
        this._pathElement = pathElement;
        this._list = this._parsePath(this._pathElement.getAttribute("d")); // Use a MutationObserver to catch changes to the path's "d" attribute.

        this._mutationObserverConfig = {
          "attributes": true,
          "attributeFilter": ["d"]
        };
        this._pathElementMutationObserver = new MutationObserver(this._updateListFromPathMutations.bind(this));

        this._pathElementMutationObserver.observe(this._pathElement, this._mutationObserverConfig);
      };

      window.SVGPathSegList.prototype.classname = "SVGPathSegList";
      Object.defineProperty(window.SVGPathSegList.prototype, "numberOfItems", {
        get: function get() {
          this._checkPathSynchronizedToList();

          return this._list.length;
        },
        enumerable: true
      }); // Add the pathSegList accessors to window.SVGPathElement.
      // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-InterfaceSVGAnimatedPathData

      Object.defineProperty(window.SVGPathElement.prototype, "pathSegList", {
        get: function get() {
          if (!this._pathSegList) this._pathSegList = new window.SVGPathSegList(this);
          return this._pathSegList;
        },
        enumerable: true
      }); // FIXME: The following are not implemented and simply return window.SVGPathElement.pathSegList.

      Object.defineProperty(window.SVGPathElement.prototype, "normalizedPathSegList", {
        get: function get() {
          return this.pathSegList;
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathElement.prototype, "animatedPathSegList", {
        get: function get() {
          return this.pathSegList;
        },
        enumerable: true
      });
      Object.defineProperty(window.SVGPathElement.prototype, "animatedNormalizedPathSegList", {
        get: function get() {
          return this.pathSegList;
        },
        enumerable: true
      }); // Process any pending mutations to the path element and update the list as needed.
      // This should be the first call of all public functions and is needed because
      // MutationObservers are not synchronous so we can have pending asynchronous mutations.

      window.SVGPathSegList.prototype._checkPathSynchronizedToList = function () {
        this._updateListFromPathMutations(this._pathElementMutationObserver.takeRecords());
      };

      window.SVGPathSegList.prototype._updateListFromPathMutations = function (mutationRecords) {
        if (!this._pathElement) return;
        var hasPathMutations = false;
        mutationRecords.forEach(function (record) {
          if (record.attributeName == "d") hasPathMutations = true;
        });
        if (hasPathMutations) this._list = this._parsePath(this._pathElement.getAttribute("d"));
      }; // Serialize the list and update the path's 'd' attribute.


      window.SVGPathSegList.prototype._writeListToPath = function () {
        this._pathElementMutationObserver.disconnect();

        this._pathElement.setAttribute("d", window.SVGPathSegList._pathSegArrayAsString(this._list));

        this._pathElementMutationObserver.observe(this._pathElement, this._mutationObserverConfig);
      }; // When a path segment changes the list needs to be synchronized back to the path element.


      window.SVGPathSegList.prototype.segmentChanged = function (pathSeg) {
        this._writeListToPath();
      };

      window.SVGPathSegList.prototype.clear = function () {
        this._checkPathSynchronizedToList();

        this._list.forEach(function (pathSeg) {
          pathSeg._owningPathSegList = null;
        });

        this._list = [];

        this._writeListToPath();
      };

      window.SVGPathSegList.prototype.initialize = function (newItem) {
        this._checkPathSynchronizedToList();

        this._list = [newItem];
        newItem._owningPathSegList = this;

        this._writeListToPath();

        return newItem;
      };

      window.SVGPathSegList.prototype._checkValidIndex = function (index) {
        if (isNaN(index) || index < 0 || index >= this.numberOfItems) throw "INDEX_SIZE_ERR";
      };

      window.SVGPathSegList.prototype.getItem = function (index) {
        this._checkPathSynchronizedToList();

        this._checkValidIndex(index);

        return this._list[index];
      };

      window.SVGPathSegList.prototype.insertItemBefore = function (newItem, index) {
        this._checkPathSynchronizedToList(); // Spec: If the index is greater than or equal to numberOfItems, then the new item is appended to the end of the list.


        if (index > this.numberOfItems) index = this.numberOfItems;

        if (newItem._owningPathSegList) {
          // SVG2 spec says to make a copy.
          newItem = newItem.clone();
        }

        this._list.splice(index, 0, newItem);

        newItem._owningPathSegList = this;

        this._writeListToPath();

        return newItem;
      };

      window.SVGPathSegList.prototype.replaceItem = function (newItem, index) {
        this._checkPathSynchronizedToList();

        if (newItem._owningPathSegList) {
          // SVG2 spec says to make a copy.
          newItem = newItem.clone();
        }

        this._checkValidIndex(index);

        this._list[index] = newItem;
        newItem._owningPathSegList = this;

        this._writeListToPath();

        return newItem;
      };

      window.SVGPathSegList.prototype.removeItem = function (index) {
        this._checkPathSynchronizedToList();

        this._checkValidIndex(index);

        var item = this._list[index];

        this._list.splice(index, 1);

        this._writeListToPath();

        return item;
      };

      window.SVGPathSegList.prototype.appendItem = function (newItem) {
        this._checkPathSynchronizedToList();

        if (newItem._owningPathSegList) {
          // SVG2 spec says to make a copy.
          newItem = newItem.clone();
        }

        this._list.push(newItem);

        newItem._owningPathSegList = this; // TODO: Optimize this to just append to the existing attribute.

        this._writeListToPath();

        return newItem;
      };

      window.SVGPathSegList._pathSegArrayAsString = function (pathSegArray) {
        var string = "";
        var first = true;
        pathSegArray.forEach(function (pathSeg) {
          if (first) {
            first = false;
            string += pathSeg._asPathString();
          } else {
            string += " " + pathSeg._asPathString();
          }
        });
        return string;
      }; // This closely follows SVGPathParser::parsePath from Source/core/svg/SVGPathParser.cpp.


      window.SVGPathSegList.prototype._parsePath = function (string) {
        if (!string || string.length == 0) return [];
        var owningPathSegList = this;

        var Builder = function Builder() {
          this.pathSegList = [];
        };

        Builder.prototype.appendSegment = function (pathSeg) {
          this.pathSegList.push(pathSeg);
        };

        var Source = function Source(string) {
          this._string = string;
          this._currentIndex = 0;
          this._endIndex = this._string.length;
          this._previousCommand = window.SVGPathSeg.PATHSEG_UNKNOWN;

          this._skipOptionalSpaces();
        };

        Source.prototype._isCurrentSpace = function () {
          var character = this._string[this._currentIndex];
          return character <= " " && (character == " " || character == "\n" || character == "\t" || character == "\r" || character == "\f");
        };

        Source.prototype._skipOptionalSpaces = function () {
          while (this._currentIndex < this._endIndex && this._isCurrentSpace()) {
            this._currentIndex++;
          }

          return this._currentIndex < this._endIndex;
        };

        Source.prototype._skipOptionalSpacesOrDelimiter = function () {
          if (this._currentIndex < this._endIndex && !this._isCurrentSpace() && this._string.charAt(this._currentIndex) != ",") return false;

          if (this._skipOptionalSpaces()) {
            if (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) == ",") {
              this._currentIndex++;

              this._skipOptionalSpaces();
            }
          }

          return this._currentIndex < this._endIndex;
        };

        Source.prototype.hasMoreData = function () {
          return this._currentIndex < this._endIndex;
        };

        Source.prototype.peekSegmentType = function () {
          var lookahead = this._string[this._currentIndex];
          return this._pathSegTypeFromChar(lookahead);
        };

        Source.prototype._pathSegTypeFromChar = function (lookahead) {
          switch (lookahead) {
            case "Z":
            case "z":
              return window.SVGPathSeg.PATHSEG_CLOSEPATH;

            case "M":
              return window.SVGPathSeg.PATHSEG_MOVETO_ABS;

            case "m":
              return window.SVGPathSeg.PATHSEG_MOVETO_REL;

            case "L":
              return window.SVGPathSeg.PATHSEG_LINETO_ABS;

            case "l":
              return window.SVGPathSeg.PATHSEG_LINETO_REL;

            case "C":
              return window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS;

            case "c":
              return window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL;

            case "Q":
              return window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS;

            case "q":
              return window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL;

            case "A":
              return window.SVGPathSeg.PATHSEG_ARC_ABS;

            case "a":
              return window.SVGPathSeg.PATHSEG_ARC_REL;

            case "H":
              return window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS;

            case "h":
              return window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL;

            case "V":
              return window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS;

            case "v":
              return window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL;

            case "S":
              return window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS;

            case "s":
              return window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL;

            case "T":
              return window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS;

            case "t":
              return window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL;

            default:
              return window.SVGPathSeg.PATHSEG_UNKNOWN;
          }
        };

        Source.prototype._nextCommandHelper = function (lookahead, previousCommand) {
          // Check for remaining coordinates in the current command.
          if ((lookahead == "+" || lookahead == "-" || lookahead == "." || lookahead >= "0" && lookahead <= "9") && previousCommand != window.SVGPathSeg.PATHSEG_CLOSEPATH) {
            if (previousCommand == window.SVGPathSeg.PATHSEG_MOVETO_ABS) return window.SVGPathSeg.PATHSEG_LINETO_ABS;
            if (previousCommand == window.SVGPathSeg.PATHSEG_MOVETO_REL) return window.SVGPathSeg.PATHSEG_LINETO_REL;
            return previousCommand;
          }

          return window.SVGPathSeg.PATHSEG_UNKNOWN;
        };

        Source.prototype.initialCommandIsMoveTo = function () {
          // If the path is empty it is still valid, so return true.
          if (!this.hasMoreData()) return true;
          var command = this.peekSegmentType(); // Path must start with moveTo.

          return command == window.SVGPathSeg.PATHSEG_MOVETO_ABS || command == window.SVGPathSeg.PATHSEG_MOVETO_REL;
        }; // Parse a number from an SVG path. This very closely follows genericParseNumber(...) from Source/core/svg/SVGParserUtilities.cpp.
        // Spec: http://www.w3.org/TR/SVG11/single-page.html#paths-PathDataBNF


        Source.prototype._parseNumber = function () {
          var exponent = 0;
          var integer = 0;
          var frac = 1;
          var decimal = 0;
          var sign = 1;
          var expsign = 1;
          var startIndex = this._currentIndex;

          this._skipOptionalSpaces(); // Read the sign.


          if (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) == "+") this._currentIndex++;else if (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) == "-") {
            this._currentIndex++;
            sign = -1;
          }
          if (this._currentIndex == this._endIndex || (this._string.charAt(this._currentIndex) < "0" || this._string.charAt(this._currentIndex) > "9") && this._string.charAt(this._currentIndex) != ".") // The first character of a number must be one of [0-9+-.].
            return undefined; // Read the integer part, build right-to-left.

          var startIntPartIndex = this._currentIndex;

          while (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) >= "0" && this._string.charAt(this._currentIndex) <= "9") {
            this._currentIndex++;
          } // Advance to first non-digit.


          if (this._currentIndex != startIntPartIndex) {
            var scanIntPartIndex = this._currentIndex - 1;
            var multiplier = 1;

            while (scanIntPartIndex >= startIntPartIndex) {
              integer += multiplier * (this._string.charAt(scanIntPartIndex--) - "0");
              multiplier *= 10;
            }
          } // Read the decimals.


          if (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) == ".") {
            this._currentIndex++; // There must be a least one digit following the .

            if (this._currentIndex >= this._endIndex || this._string.charAt(this._currentIndex) < "0" || this._string.charAt(this._currentIndex) > "9") return undefined;

            while (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) >= "0" && this._string.charAt(this._currentIndex) <= "9") {
              frac *= 10;
              decimal += (this._string.charAt(this._currentIndex) - "0") / frac;
              this._currentIndex += 1;
            }
          } // Read the exponent part.


          if (this._currentIndex != startIndex && this._currentIndex + 1 < this._endIndex && (this._string.charAt(this._currentIndex) == "e" || this._string.charAt(this._currentIndex) == "E") && this._string.charAt(this._currentIndex + 1) != "x" && this._string.charAt(this._currentIndex + 1) != "m") {
            this._currentIndex++; // Read the sign of the exponent.

            if (this._string.charAt(this._currentIndex) == "+") {
              this._currentIndex++;
            } else if (this._string.charAt(this._currentIndex) == "-") {
              this._currentIndex++;
              expsign = -1;
            } // There must be an exponent.


            if (this._currentIndex >= this._endIndex || this._string.charAt(this._currentIndex) < "0" || this._string.charAt(this._currentIndex) > "9") return undefined;

            while (this._currentIndex < this._endIndex && this._string.charAt(this._currentIndex) >= "0" && this._string.charAt(this._currentIndex) <= "9") {
              exponent *= 10;
              exponent += this._string.charAt(this._currentIndex) - "0";
              this._currentIndex++;
            }
          }

          var number = integer + decimal;
          number *= sign;
          if (exponent) number *= Math.pow(10, expsign * exponent);
          if (startIndex == this._currentIndex) return undefined;

          this._skipOptionalSpacesOrDelimiter();

          return number;
        };

        Source.prototype._parseArcFlag = function () {
          if (this._currentIndex >= this._endIndex) return undefined;
          var flag = false;

          var flagChar = this._string.charAt(this._currentIndex++);

          if (flagChar == "0") flag = false;else if (flagChar == "1") flag = true;else return undefined;

          this._skipOptionalSpacesOrDelimiter();

          return flag;
        };

        Source.prototype.parseSegment = function () {
          var lookahead = this._string[this._currentIndex];

          var command = this._pathSegTypeFromChar(lookahead);

          if (command == window.SVGPathSeg.PATHSEG_UNKNOWN) {
            // Possibly an implicit command. Not allowed if this is the first command.
            if (this._previousCommand == window.SVGPathSeg.PATHSEG_UNKNOWN) return null;
            command = this._nextCommandHelper(lookahead, this._previousCommand);
            if (command == window.SVGPathSeg.PATHSEG_UNKNOWN) return null;
          } else {
            this._currentIndex++;
          }

          this._previousCommand = command;

          switch (command) {
            case window.SVGPathSeg.PATHSEG_MOVETO_REL:
              return new window.SVGPathSegMovetoRel(owningPathSegList, this._parseNumber(), this._parseNumber());

            case window.SVGPathSeg.PATHSEG_MOVETO_ABS:
              return new window.SVGPathSegMovetoAbs(owningPathSegList, this._parseNumber(), this._parseNumber());

            case window.SVGPathSeg.PATHSEG_LINETO_REL:
              return new window.SVGPathSegLinetoRel(owningPathSegList, this._parseNumber(), this._parseNumber());

            case window.SVGPathSeg.PATHSEG_LINETO_ABS:
              return new window.SVGPathSegLinetoAbs(owningPathSegList, this._parseNumber(), this._parseNumber());

            case window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_REL:
              return new window.SVGPathSegLinetoHorizontalRel(owningPathSegList, this._parseNumber());

            case window.SVGPathSeg.PATHSEG_LINETO_HORIZONTAL_ABS:
              return new window.SVGPathSegLinetoHorizontalAbs(owningPathSegList, this._parseNumber());

            case window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_REL:
              return new window.SVGPathSegLinetoVerticalRel(owningPathSegList, this._parseNumber());

            case window.SVGPathSeg.PATHSEG_LINETO_VERTICAL_ABS:
              return new window.SVGPathSegLinetoVerticalAbs(owningPathSegList, this._parseNumber());

            case window.SVGPathSeg.PATHSEG_CLOSEPATH:
              this._skipOptionalSpaces();

              return new window.SVGPathSegClosePath(owningPathSegList);

            case window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_REL:
              var points = {
                x1: this._parseNumber(),
                y1: this._parseNumber(),
                x2: this._parseNumber(),
                y2: this._parseNumber(),
                x: this._parseNumber(),
                y: this._parseNumber()
              };
              return new window.SVGPathSegCurvetoCubicRel(owningPathSegList, points.x, points.y, points.x1, points.y1, points.x2, points.y2);

            case window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_ABS:
              var points = {
                x1: this._parseNumber(),
                y1: this._parseNumber(),
                x2: this._parseNumber(),
                y2: this._parseNumber(),
                x: this._parseNumber(),
                y: this._parseNumber()
              };
              return new window.SVGPathSegCurvetoCubicAbs(owningPathSegList, points.x, points.y, points.x1, points.y1, points.x2, points.y2);

            case window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_REL:
              var points = {
                x2: this._parseNumber(),
                y2: this._parseNumber(),
                x: this._parseNumber(),
                y: this._parseNumber()
              };
              return new window.SVGPathSegCurvetoCubicSmoothRel(owningPathSegList, points.x, points.y, points.x2, points.y2);

            case window.SVGPathSeg.PATHSEG_CURVETO_CUBIC_SMOOTH_ABS:
              var points = {
                x2: this._parseNumber(),
                y2: this._parseNumber(),
                x: this._parseNumber(),
                y: this._parseNumber()
              };
              return new window.SVGPathSegCurvetoCubicSmoothAbs(owningPathSegList, points.x, points.y, points.x2, points.y2);

            case window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_REL:
              var points = {
                x1: this._parseNumber(),
                y1: this._parseNumber(),
                x: this._parseNumber(),
                y: this._parseNumber()
              };
              return new window.SVGPathSegCurvetoQuadraticRel(owningPathSegList, points.x, points.y, points.x1, points.y1);

            case window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_ABS:
              var points = {
                x1: this._parseNumber(),
                y1: this._parseNumber(),
                x: this._parseNumber(),
                y: this._parseNumber()
              };
              return new window.SVGPathSegCurvetoQuadraticAbs(owningPathSegList, points.x, points.y, points.x1, points.y1);

            case window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_REL:
              return new window.SVGPathSegCurvetoQuadraticSmoothRel(owningPathSegList, this._parseNumber(), this._parseNumber());

            case window.SVGPathSeg.PATHSEG_CURVETO_QUADRATIC_SMOOTH_ABS:
              return new window.SVGPathSegCurvetoQuadraticSmoothAbs(owningPathSegList, this._parseNumber(), this._parseNumber());

            case window.SVGPathSeg.PATHSEG_ARC_REL:
              var points = {
                x1: this._parseNumber(),
                y1: this._parseNumber(),
                arcAngle: this._parseNumber(),
                arcLarge: this._parseArcFlag(),
                arcSweep: this._parseArcFlag(),
                x: this._parseNumber(),
                y: this._parseNumber()
              };
              return new window.SVGPathSegArcRel(owningPathSegList, points.x, points.y, points.x1, points.y1, points.arcAngle, points.arcLarge, points.arcSweep);

            case window.SVGPathSeg.PATHSEG_ARC_ABS:
              var points = {
                x1: this._parseNumber(),
                y1: this._parseNumber(),
                arcAngle: this._parseNumber(),
                arcLarge: this._parseArcFlag(),
                arcSweep: this._parseArcFlag(),
                x: this._parseNumber(),
                y: this._parseNumber()
              };
              return new window.SVGPathSegArcAbs(owningPathSegList, points.x, points.y, points.x1, points.y1, points.arcAngle, points.arcLarge, points.arcSweep);

            default:
              throw "Unknown path seg type.";
          }
        };

        var builder = new Builder();
        var source = new Source(string);
        if (!source.initialCommandIsMoveTo()) return [];

        while (source.hasMoreData()) {
          var pathSeg = source.parseSegment();
          if (!pathSeg) return [];
          builder.appendSegment(pathSeg);
        }

        return builder.pathSegList;
      };
    }
  })(); // String.padEnd polyfill for IE11
  //
  // https://github.com/uxitten/polyfill/blob/master/string.polyfill.js
  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/padEnd


  if (!String.prototype.padEnd) {
    String.prototype.padEnd = function padEnd(targetLength, padString) {
      targetLength = targetLength >> 0; //floor if number or convert non-number to 0;

      padString = String(typeof padString !== 'undefined' ? padString : ' ');

      if (this.length > targetLength) {
        return String(this);
      } else {
        targetLength = targetLength - this.length;

        if (targetLength > padString.length) {
          padString += padString.repeat(targetLength / padString.length); //append to original to ensure we are longer than needed
        }

        return String(this) + padString.slice(0, targetLength);
      }
    };
  } // Object.assign polyfill for IE11
  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign#Polyfill


  if (typeof Object.assign !== 'function') {
    // Must be writable: true, enumerable: false, configurable: true
    Object.defineProperty(Object, "assign", {
      value: function assign(target, varArgs) {

        if (target === null || target === undefined) {
          throw new TypeError('Cannot convert undefined or null to object');
        }

        var to = Object(target);

        for (var index = 1; index < arguments.length; index++) {
          var nextSource = arguments[index];

          if (nextSource !== null && nextSource !== undefined) {
            for (var nextKey in nextSource) {
              // Avoid bugs when hasOwnProperty is shadowed
              if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
                to[nextKey] = nextSource[nextKey];
              }
            }
          }
        }

        return to;
      },
      writable: true,
      configurable: true
    });
  }
  /* jshint ignore:end */

  Chart.prototype.axis = function () {};

  Chart.prototype.axis.labels = function (labels) {
    var $$ = this.internal;

    if (arguments.length) {
      Object.keys(labels).forEach(function (axisId) {
        $$.axis.setLabelText(axisId, labels[axisId]);
      });
      $$.axis.updateLabels();
    } // TODO: return some values?

  };

  Chart.prototype.axis.max = function (max) {
    var $$ = this.internal,
        config = $$.config;

    if (arguments.length) {
      if (_typeof(max) === 'object') {
        if (isValue(max.x)) {
          config.axis_x_max = max.x;
        }

        if (isValue(max.y)) {
          config.axis_y_max = max.y;
        }

        if (isValue(max.y2)) {
          config.axis_y2_max = max.y2;
        }
      } else {
        config.axis_y_max = config.axis_y2_max = max;
      }

      $$.redraw({
        withUpdateOrgXDomain: true,
        withUpdateXDomain: true
      });
    } else {
      return {
        x: config.axis_x_max,
        y: config.axis_y_max,
        y2: config.axis_y2_max
      };
    }
  };

  Chart.prototype.axis.min = function (min) {
    var $$ = this.internal,
        config = $$.config;

    if (arguments.length) {
      if (_typeof(min) === 'object') {
        if (isValue(min.x)) {
          config.axis_x_min = min.x;
        }

        if (isValue(min.y)) {
          config.axis_y_min = min.y;
        }

        if (isValue(min.y2)) {
          config.axis_y2_min = min.y2;
        }
      } else {
        config.axis_y_min = config.axis_y2_min = min;
      }

      $$.redraw({
        withUpdateOrgXDomain: true,
        withUpdateXDomain: true
      });
    } else {
      return {
        x: config.axis_x_min,
        y: config.axis_y_min,
        y2: config.axis_y2_min
      };
    }
  };

  Chart.prototype.axis.range = function (range) {
    if (arguments.length) {
      if (isDefined(range.max)) {
        this.axis.max(range.max);
      }

      if (isDefined(range.min)) {
        this.axis.min(range.min);
      }
    } else {
      return {
        max: this.axis.max(),
        min: this.axis.min()
      };
    }
  };

  Chart.prototype.axis.types = function (types) {
    var $$ = this.internal;

    if (types === undefined) {
      return {
        y: $$.config.axis_y_type,
        y2: $$.config.axis_y2_type
      };
    } else {
      if (isDefined(types.y)) {
        $$.config.axis_y_type = types.y;
      }

      if (isDefined(types.y2)) {
        $$.config.axis_y2_type = types.y2;
      }

      $$.updateScales();
      $$.redraw();
    }
  };

  Chart.prototype.category = function (i, category) {
    var $$ = this.internal,
        config = $$.config;

    if (arguments.length > 1) {
      config.axis_x_categories[i] = category;
      $$.redraw();
    }

    return config.axis_x_categories[i];
  };

  Chart.prototype.categories = function (categories) {
    var $$ = this.internal,
        config = $$.config;

    if (!arguments.length) {
      return config.axis_x_categories;
    }

    config.axis_x_categories = categories;
    $$.redraw();
    return config.axis_x_categories;
  };

  Chart.prototype.resize = function (size) {
    var $$ = this.internal,
        config = $$.config;
    config.size_width = size ? size.width : null;
    config.size_height = size ? size.height : null;
    this.flush();
  };

  Chart.prototype.flush = function () {
    var $$ = this.internal;
    $$.updateAndRedraw({
      withLegend: true,
      withTransition: false,
      withTransitionForTransform: false
    });
  };

  Chart.prototype.destroy = function () {
    var $$ = this.internal;
    window.clearInterval($$.intervalForObserveInserted);

    if ($$.resizeTimeout !== undefined) {
      window.clearTimeout($$.resizeTimeout);
    }

    if (window.detachEvent) {
      window.detachEvent('onresize', $$.resizeIfElementDisplayed);
    } else if (window.removeEventListener) {
      window.removeEventListener('resize', $$.resizeIfElementDisplayed);
    } else {
      var wrapper = window.onresize; // check if no one else removed our wrapper and remove our resizeFunction from it

      if (wrapper && wrapper.add && wrapper.remove) {
        wrapper.remove($$.resizeFunction);
      }
    } // Removes the inner resize functions


    $$.resizeFunction.remove(); // Unbinds from the window focus event

    $$.unbindWindowFocus();
    $$.selectChart.classed('c3', false).html(""); // MEMO: this is needed because the reference of some elements will not be released, then memory leak will happen.

    Object.keys($$).forEach(function (key) {
      $$[key] = null;
    });
    return null;
  };

  Chart.prototype.color = function (id) {
    var $$ = this.internal;
    return $$.color(id); // more patterns
  };

  Chart.prototype.data = function (targetIds) {
    var targets = this.internal.data.targets;
    return typeof targetIds === 'undefined' ? targets : targets.filter(function (t) {
      return [].concat(targetIds).indexOf(t.id) >= 0;
    });
  };

  Chart.prototype.data.shown = function (targetIds) {
    return this.internal.filterTargetsToShow(this.data(targetIds));
  };
  /**
   * Get values of the data loaded in the chart.
   *
   * @param {String|Array} targetId This API returns the value of specified target.
   * @param flat
   * @return {Array} Data values
   */


  Chart.prototype.data.values = function (targetId) {
    var flat = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : true;
    var values = null;

    if (targetId) {
      var targets = this.data(targetId);

      if (targets && isArray(targets)) {
        values = targets.reduce(function (ret, v) {
          var dataValue = v.values.map(function (d) {
            return d.value;
          });

          if (flat) {
            ret = ret.concat(dataValue);
          } else {
            ret.push(dataValue);
          }

          return ret;
        }, []);
      }
    }

    return values;
  };

  Chart.prototype.data.names = function (names) {
    this.internal.clearLegendItemTextBoxCache();
    return this.internal.updateDataAttributes('names', names);
  };

  Chart.prototype.data.colors = function (colors) {
    return this.internal.updateDataAttributes('colors', colors);
  };

  Chart.prototype.data.axes = function (axes) {
    return this.internal.updateDataAttributes('axes', axes);
  };

  Chart.prototype.data.stackNormalized = function (normalized) {
    if (normalized === undefined) {
      return this.internal.isStackNormalized();
    }

    this.internal.config.data_stack_normalize = !!normalized;
    this.internal.redraw();
  };

  Chart.prototype.donut = function () {};

  Chart.prototype.donut.padAngle = function (padAngle) {
    if (padAngle === undefined) {
      return this.internal.config.donut_padAngle;
    }

    this.internal.config.donut_padAngle = padAngle;
    this.flush();
  };

  Chart.prototype.flow = function (args) {
    var $$ = this.internal,
        targets,
        data,
        notfoundIds = [],
        orgDataCount = $$.getMaxDataCount(),
        dataCount,
        domain,
        baseTarget,
        baseValue,
        length = 0,
        tail = 0,
        diff,
        to;

    if (args.json) {
      data = $$.convertJsonToData(args.json, args.keys);
    } else if (args.rows) {
      data = $$.convertRowsToData(args.rows);
    } else if (args.columns) {
      data = $$.convertColumnsToData(args.columns);
    } else {
      return;
    }

    targets = $$.convertDataToTargets(data, true); // Update/Add data

    $$.data.targets.forEach(function (t) {
      var found = false,
          i,
          j;

      for (i = 0; i < targets.length; i++) {
        if (t.id === targets[i].id) {
          found = true;

          if (t.values[t.values.length - 1]) {
            tail = t.values[t.values.length - 1].index + 1;
          }

          length = targets[i].values.length;

          for (j = 0; j < length; j++) {
            targets[i].values[j].index = tail + j;

            if (!$$.isTimeSeries()) {
              targets[i].values[j].x = tail + j;
            }
          }

          t.values = t.values.concat(targets[i].values);
          targets.splice(i, 1);
          break;
        }
      }

      if (!found) {
        notfoundIds.push(t.id);
      }
    }); // Append null for not found targets

    $$.data.targets.forEach(function (t) {
      var i, j;

      for (i = 0; i < notfoundIds.length; i++) {
        if (t.id === notfoundIds[i]) {
          tail = t.values[t.values.length - 1].index + 1;

          for (j = 0; j < length; j++) {
            t.values.push({
              id: t.id,
              index: tail + j,
              x: $$.isTimeSeries() ? $$.getOtherTargetX(tail + j) : tail + j,
              value: null
            });
          }
        }
      }
    }); // Generate null values for new target

    if ($$.data.targets.length) {
      targets.forEach(function (t) {
        var i,
            missing = [];

        for (i = $$.data.targets[0].values[0].index; i < tail; i++) {
          missing.push({
            id: t.id,
            index: i,
            x: $$.isTimeSeries() ? $$.getOtherTargetX(i) : i,
            value: null
          });
        }

        t.values.forEach(function (v) {
          v.index += tail;

          if (!$$.isTimeSeries()) {
            v.x += tail;
          }
        });
        t.values = missing.concat(t.values);
      });
    }

    $$.data.targets = $$.data.targets.concat(targets); // add remained
    // check data count because behavior needs to change when it's only one

    dataCount = $$.getMaxDataCount();
    baseTarget = $$.data.targets[0];
    baseValue = baseTarget.values[0]; // Update length to flow if needed

    if (isDefined(args.to)) {
      length = 0;
      to = $$.isTimeSeries() ? $$.parseDate(args.to) : args.to;
      baseTarget.values.forEach(function (v) {
        if (v.x < to) {
          length++;
        }
      });
    } else if (isDefined(args.length)) {
      length = args.length;
    } // If only one data, update the domain to flow from left edge of the chart


    if (!orgDataCount) {
      if ($$.isTimeSeries()) {
        if (baseTarget.values.length > 1) {
          diff = baseTarget.values[baseTarget.values.length - 1].x - baseValue.x;
        } else {
          diff = baseValue.x - $$.getXDomain($$.data.targets)[0];
        }
      } else {
        diff = 1;
      }

      domain = [baseValue.x - diff, baseValue.x];
      $$.updateXDomain(null, true, true, false, domain);
    } else if (orgDataCount === 1) {
      if ($$.isTimeSeries()) {
        diff = (baseTarget.values[baseTarget.values.length - 1].x - baseValue.x) / 2;
        domain = [new Date(+baseValue.x - diff), new Date(+baseValue.x + diff)];
        $$.updateXDomain(null, true, true, false, domain);
      }
    } // Set targets


    $$.updateTargets($$.data.targets); // Redraw with new targets

    $$.redraw({
      flow: {
        index: baseValue.index,
        length: length,
        duration: isValue(args.duration) ? args.duration : $$.config.transition_duration,
        done: args.done,
        orgDataCount: orgDataCount
      },
      withLegend: true,
      withTransition: orgDataCount > 1,
      withTrimXDomain: false,
      withUpdateXAxis: true
    });
  };

  ChartInternal.prototype.generateFlow = function (args) {
    var $$ = this,
        config = $$.config,
        d3 = $$.d3;
    return function () {
      var targets = args.targets,
          flow = args.flow,
          drawBar = args.drawBar,
          drawLine = args.drawLine,
          drawArea = args.drawArea,
          cx = args.cx,
          cy = args.cy,
          xv = args.xv,
          xForText = args.xForText,
          yForText = args.yForText,
          duration = args.duration;

      var translateX,
          scaleX = 1,
          transform,
          flowIndex = flow.index,
          flowLength = flow.length,
          flowStart = $$.getValueOnIndex($$.data.targets[0].values, flowIndex),
          flowEnd = $$.getValueOnIndex($$.data.targets[0].values, flowIndex + flowLength),
          orgDomain = $$.x.domain(),
          domain,
          durationForFlow = flow.duration || duration,
          done = flow.done || function () {},
          wait = $$.generateWait();

      var xgrid, xgridLines, mainRegion, mainText, mainBar, mainLine, mainArea, mainCircle; // set flag

      $$.flowing = true; // remove head data after rendered

      $$.data.targets.forEach(function (d) {
        d.values.splice(0, flowLength);
      }); // update x domain to generate axis elements for flow

      domain = $$.updateXDomain(targets, true, true); // update elements related to x scale

      if ($$.updateXGrid) {
        $$.updateXGrid(true);
      }

      xgrid = $$.xgrid || d3.selectAll([]); // xgrid needs to be obtained after updateXGrid

      xgridLines = $$.xgridLines || d3.selectAll([]);
      mainRegion = $$.mainRegion || d3.selectAll([]);
      mainText = $$.mainText || d3.selectAll([]);
      mainBar = $$.mainBar || d3.selectAll([]);
      mainLine = $$.mainLine || d3.selectAll([]);
      mainArea = $$.mainArea || d3.selectAll([]);
      mainCircle = $$.mainCircle || d3.selectAll([]); // generate transform to flow

      if (!flow.orgDataCount) {
        // if empty
        if ($$.data.targets[0].values.length !== 1) {
          translateX = $$.x(orgDomain[0]) - $$.x(domain[0]);
        } else {
          if ($$.isTimeSeries()) {
            flowStart = $$.getValueOnIndex($$.data.targets[0].values, 0);
            flowEnd = $$.getValueOnIndex($$.data.targets[0].values, $$.data.targets[0].values.length - 1);
            translateX = $$.x(flowStart.x) - $$.x(flowEnd.x);
          } else {
            translateX = diffDomain(domain) / 2;
          }
        }
      } else if (flow.orgDataCount === 1 || (flowStart && flowStart.x) === (flowEnd && flowEnd.x)) {
        translateX = $$.x(orgDomain[0]) - $$.x(domain[0]);
      } else {
        if ($$.isTimeSeries()) {
          translateX = $$.x(orgDomain[0]) - $$.x(domain[0]);
        } else {
          translateX = $$.x(flowStart.x) - $$.x(flowEnd.x);
        }
      }

      scaleX = diffDomain(orgDomain) / diffDomain(domain);
      transform = 'translate(' + translateX + ',0) scale(' + scaleX + ',1)';
      $$.hideXGridFocus();
      var flowTransition = d3.transition().ease(d3.easeLinear).duration(durationForFlow);
      wait.add($$.xAxis($$.axes.x, flowTransition));
      wait.add(mainBar.transition(flowTransition).attr('transform', transform));
      wait.add(mainLine.transition(flowTransition).attr('transform', transform));
      wait.add(mainArea.transition(flowTransition).attr('transform', transform));
      wait.add(mainCircle.transition(flowTransition).attr('transform', transform));
      wait.add(mainText.transition(flowTransition).attr('transform', transform));
      wait.add(mainRegion.filter($$.isRegionOnX).transition(flowTransition).attr('transform', transform));
      wait.add(xgrid.transition(flowTransition).attr('transform', transform));
      wait.add(xgridLines.transition(flowTransition).attr('transform', transform));
      wait(function () {
        var i,
            shapes = [],
            texts = []; // remove flowed elements

        if (flowLength) {
          for (i = 0; i < flowLength; i++) {
            shapes.push('.' + CLASS.shape + '-' + (flowIndex + i));
            texts.push('.' + CLASS.text + '-' + (flowIndex + i));
          }

          $$.svg.selectAll('.' + CLASS.shapes).selectAll(shapes).remove();
          $$.svg.selectAll('.' + CLASS.texts).selectAll(texts).remove();
          $$.svg.select('.' + CLASS.xgrid).remove();
        } // draw again for removing flowed elements and reverting attr


        xgrid.attr('transform', null).attr('x1', $$.xgridAttr.x1).attr('x2', $$.xgridAttr.x2).attr('y1', $$.xgridAttr.y1).attr('y2', $$.xgridAttr.y2).style("opacity", $$.xgridAttr.opacity);
        xgridLines.attr('transform', null);
        xgridLines.select('line').attr("x1", config.axis_rotated ? 0 : xv).attr("x2", config.axis_rotated ? $$.width : xv);
        xgridLines.select('text').attr("x", config.axis_rotated ? $$.width : 0).attr("y", xv);
        mainBar.attr('transform', null).attr("d", drawBar);
        mainLine.attr('transform', null).attr("d", drawLine);
        mainArea.attr('transform', null).attr("d", drawArea);
        mainCircle.attr('transform', null).attr("cx", cx).attr("cy", cy);
        mainText.attr('transform', null).attr('x', xForText).attr('y', yForText).style('fill-opacity', $$.opacityForText.bind($$));
        mainRegion.attr('transform', null);
        mainRegion.filter($$.isRegionOnX).attr("x", $$.regionX.bind($$)).attr("width", $$.regionWidth.bind($$)); // callback for end of flow

        done();
        $$.flowing = false;
      });
    };
  };

  Chart.prototype.focus = function (targetIds) {
    var $$ = this.internal,
        candidates;
    targetIds = $$.mapToTargetIds(targetIds);
    candidates = $$.svg.selectAll($$.selectorTargets(targetIds.filter($$.isTargetToShow, $$))), this.revert();
    this.defocus();
    candidates.classed(CLASS.focused, true).classed(CLASS.defocused, false);

    if ($$.hasArcType()) {
      $$.expandArc(targetIds);
    }

    $$.toggleFocusLegend(targetIds, true);
    $$.focusedTargetIds = targetIds;
    $$.defocusedTargetIds = $$.defocusedTargetIds.filter(function (id) {
      return targetIds.indexOf(id) < 0;
    });
  };

  Chart.prototype.defocus = function (targetIds) {
    var $$ = this.internal,
        candidates;
    targetIds = $$.mapToTargetIds(targetIds);
    candidates = $$.svg.selectAll($$.selectorTargets(targetIds.filter($$.isTargetToShow, $$))), candidates.classed(CLASS.focused, false).classed(CLASS.defocused, true);

    if ($$.hasArcType()) {
      $$.unexpandArc(targetIds);
    }

    $$.toggleFocusLegend(targetIds, false);
    $$.focusedTargetIds = $$.focusedTargetIds.filter(function (id) {
      return targetIds.indexOf(id) < 0;
    });
    $$.defocusedTargetIds = targetIds;
  };

  Chart.prototype.revert = function (targetIds) {
    var $$ = this.internal,
        candidates;
    targetIds = $$.mapToTargetIds(targetIds);
    candidates = $$.svg.selectAll($$.selectorTargets(targetIds)); // should be for all targets

    candidates.classed(CLASS.focused, false).classed(CLASS.defocused, false);

    if ($$.hasArcType()) {
      $$.unexpandArc(targetIds);
    }

    if ($$.config.legend_show) {
      $$.showLegend(targetIds.filter($$.isLegendToShow.bind($$)));
      $$.legend.selectAll($$.selectorLegends(targetIds)).filter(function () {
        return $$.d3.select(this).classed(CLASS.legendItemFocused);
      }).classed(CLASS.legendItemFocused, false);
    }

    $$.focusedTargetIds = [];
    $$.defocusedTargetIds = [];
  };

  Chart.prototype.xgrids = function (grids) {
    var $$ = this.internal,
        config = $$.config;

    if (!grids) {
      return config.grid_x_lines;
    }

    config.grid_x_lines = grids;
    $$.redrawWithoutRescale();
    return config.grid_x_lines;
  };

  Chart.prototype.xgrids.add = function (grids) {
    var $$ = this.internal;
    return this.xgrids($$.config.grid_x_lines.concat(grids ? grids : []));
  };

  Chart.prototype.xgrids.remove = function (params) {
    // TODO: multiple
    var $$ = this.internal;
    $$.removeGridLines(params, true);
  };

  Chart.prototype.ygrids = function (grids) {
    var $$ = this.internal,
        config = $$.config;

    if (!grids) {
      return config.grid_y_lines;
    }

    config.grid_y_lines = grids;
    $$.redrawWithoutRescale();
    return config.grid_y_lines;
  };

  Chart.prototype.ygrids.add = function (grids) {
    var $$ = this.internal;
    return this.ygrids($$.config.grid_y_lines.concat(grids ? grids : []));
  };

  Chart.prototype.ygrids.remove = function (params) {
    // TODO: multiple
    var $$ = this.internal;
    $$.removeGridLines(params, false);
  };

  Chart.prototype.groups = function (groups) {
    var $$ = this.internal,
        config = $$.config;

    if (isUndefined(groups)) {
      return config.data_groups;
    }

    config.data_groups = groups;
    $$.redraw();
    return config.data_groups;
  };

  Chart.prototype.legend = function () {};

  Chart.prototype.legend.show = function (targetIds) {
    var $$ = this.internal;
    $$.showLegend($$.mapToTargetIds(targetIds));
    $$.updateAndRedraw({
      withLegend: true
    });
  };

  Chart.prototype.legend.hide = function (targetIds) {
    var $$ = this.internal;
    $$.hideLegend($$.mapToTargetIds(targetIds));
    $$.updateAndRedraw({
      withLegend: false
    });
  };

  Chart.prototype.load = function (args) {
    var $$ = this.internal,
        config = $$.config; // update xs if specified

    if (args.xs) {
      $$.addXs(args.xs);
    } // update names if exists


    if ('names' in args) {
      Chart.prototype.data.names.bind(this)(args.names);
    } // update classes if exists


    if ('classes' in args) {
      Object.keys(args.classes).forEach(function (id) {
        config.data_classes[id] = args.classes[id];
      });
    } // update categories if exists


    if ('categories' in args && $$.isCategorized()) {
      config.axis_x_categories = args.categories;
    } // update axes if exists


    if ('axes' in args) {
      Object.keys(args.axes).forEach(function (id) {
        config.data_axes[id] = args.axes[id];
      });
    } // update colors if exists


    if ('colors' in args) {
      Object.keys(args.colors).forEach(function (id) {
        config.data_colors[id] = args.colors[id];
      });
    } // use cache if exists


    if ('cacheIds' in args && $$.hasCaches(args.cacheIds)) {
      $$.load($$.getCaches(args.cacheIds), args.done);
      return;
    } // unload if needed


    if (args.unload) {
      // TODO: do not unload if target will load (included in url/rows/columns)
      $$.unload($$.mapToTargetIds(args.unload === true ? null : args.unload), function () {
        $$.loadFromArgs(args);
      });
    } else {
      $$.loadFromArgs(args);
    }
  };

  Chart.prototype.unload = function (args) {
    var $$ = this.internal;
    args = args || {};

    if (args instanceof Array) {
      args = {
        ids: args
      };
    } else if (typeof args === 'string') {
      args = {
        ids: [args]
      };
    }

    $$.unload($$.mapToTargetIds(args.ids), function () {
      $$.redraw({
        withUpdateOrgXDomain: true,
        withUpdateXDomain: true,
        withLegend: true
      });

      if (args.done) {
        args.done();
      }
    });
  };

  Chart.prototype.pie = function () {};

  Chart.prototype.pie.padAngle = function (padAngle) {
    if (padAngle === undefined) {
      return this.internal.config.pie_padAngle;
    }

    this.internal.config.pie_padAngle = padAngle;
    this.flush();
  };

  Chart.prototype.regions = function (regions) {
    var $$ = this.internal,
        config = $$.config;

    if (!regions) {
      return config.regions;
    }

    config.regions = regions;
    $$.redrawWithoutRescale();
    return config.regions;
  };

  Chart.prototype.regions.add = function (regions) {
    var $$ = this.internal,
        config = $$.config;

    if (!regions) {
      return config.regions;
    }

    config.regions = config.regions.concat(regions);
    $$.redrawWithoutRescale();
    return config.regions;
  };

  Chart.prototype.regions.remove = function (options) {
    var $$ = this.internal,
        config = $$.config,
        duration,
        classes,
        regions;
    options = options || {};
    duration = getOption(options, "duration", config.transition_duration);
    classes = getOption(options, "classes", [CLASS.region]);
    regions = $$.main.select('.' + CLASS.regions).selectAll(classes.map(function (c) {
      return '.' + c;
    }));
    (duration ? regions.transition().duration(duration) : regions).style('opacity', 0).remove();
    config.regions = config.regions.filter(function (region) {
      var found = false;

      if (!region['class']) {
        return true;
      }

      region['class'].split(' ').forEach(function (c) {
        if (classes.indexOf(c) >= 0) {
          found = true;
        }
      });
      return !found;
    });
    return config.regions;
  };

  Chart.prototype.selected = function (targetId) {
    var $$ = this.internal,
        d3 = $$.d3;
    return $$.main.selectAll('.' + CLASS.shapes + $$.getTargetSelectorSuffix(targetId)).selectAll('.' + CLASS.shape).filter(function () {
      return d3.select(this).classed(CLASS.SELECTED);
    }).nodes().map(function (d) {
      var data = d.__data__;
      return data.data ? data.data : data;
    });
  };

  Chart.prototype.select = function (ids, indices, resetOther) {
    var $$ = this.internal,
        d3 = $$.d3,
        config = $$.config;

    if (!config.data_selection_enabled) {
      return;
    }

    $$.main.selectAll('.' + CLASS.shapes).selectAll('.' + CLASS.shape).each(function (d, i) {
      var shape = d3.select(this),
          id = d.data ? d.data.id : d.id,
          toggle = $$.getToggle(this, d).bind($$),
          isTargetId = config.data_selection_grouped || !ids || ids.indexOf(id) >= 0,
          isTargetIndex = !indices || indices.indexOf(i) >= 0,
          isSelected = shape.classed(CLASS.SELECTED); // line/area selection not supported yet

      if (shape.classed(CLASS.line) || shape.classed(CLASS.area)) {
        return;
      }

      if (isTargetId && isTargetIndex) {
        if (config.data_selection_isselectable(d) && !isSelected) {
          toggle(true, shape.classed(CLASS.SELECTED, true), d, i);
        }
      } else if (isDefined(resetOther) && resetOther) {
        if (isSelected) {
          toggle(false, shape.classed(CLASS.SELECTED, false), d, i);
        }
      }
    });
  };

  Chart.prototype.unselect = function (ids, indices) {
    var $$ = this.internal,
        d3 = $$.d3,
        config = $$.config;

    if (!config.data_selection_enabled) {
      return;
    }

    $$.main.selectAll('.' + CLASS.shapes).selectAll('.' + CLASS.shape).each(function (d, i) {
      var shape = d3.select(this),
          id = d.data ? d.data.id : d.id,
          toggle = $$.getToggle(this, d).bind($$),
          isTargetId = config.data_selection_grouped || !ids || ids.indexOf(id) >= 0,
          isTargetIndex = !indices || indices.indexOf(i) >= 0,
          isSelected = shape.classed(CLASS.SELECTED); // line/area selection not supported yet

      if (shape.classed(CLASS.line) || shape.classed(CLASS.area)) {
        return;
      }

      if (isTargetId && isTargetIndex) {
        if (config.data_selection_isselectable(d)) {
          if (isSelected) {
            toggle(false, shape.classed(CLASS.SELECTED, false), d, i);
          }
        }
      }
    });
  };

  Chart.prototype.show = function (targetIds, options) {
    var $$ = this.internal,
        targets;
    targetIds = $$.mapToTargetIds(targetIds);
    options = options || {};
    $$.removeHiddenTargetIds(targetIds);
    targets = $$.svg.selectAll($$.selectorTargets(targetIds));
    targets.transition().style('display', isIE() ? 'block' : 'initial', 'important').style('opacity', 1, 'important').call($$.endall, function () {
      targets.style('opacity', null).style('opacity', 1);
    });

    if (options.withLegend) {
      $$.showLegend(targetIds);
    }

    $$.redraw({
      withUpdateOrgXDomain: true,
      withUpdateXDomain: true,
      withLegend: true
    });
  };

  Chart.prototype.hide = function (targetIds, options) {
    var $$ = this.internal,
        targets;
    targetIds = $$.mapToTargetIds(targetIds);
    options = options || {};
    $$.addHiddenTargetIds(targetIds);
    targets = $$.svg.selectAll($$.selectorTargets(targetIds));
    targets.transition().style('opacity', 0, 'important').call($$.endall, function () {
      targets.style('opacity', null).style('opacity', 0);
      targets.style('display', 'none');
    });

    if (options.withLegend) {
      $$.hideLegend(targetIds);
    }

    $$.redraw({
      withUpdateOrgXDomain: true,
      withUpdateXDomain: true,
      withLegend: true
    });
  };

  Chart.prototype.toggle = function (targetIds, options) {
    var that = this,
        $$ = this.internal;
    $$.mapToTargetIds(targetIds).forEach(function (targetId) {
      $$.isTargetToShow(targetId) ? that.hide(targetId, options) : that.show(targetId, options);
    });
  };

  Chart.prototype.subchart = function () {};

  Chart.prototype.subchart.isShown = function () {
    var $$ = this.internal;
    return $$.config.subchart_show;
  };

  Chart.prototype.subchart.show = function () {
    var $$ = this.internal;

    if ($$.config.subchart_show) {
      return;
    }

    $$.config.subchart_show = true; // insert DOM

    $$.initSubchart(); // update dimensions with sub chart now visible

    $$.updateDimension(); // insert brush (depends on sizes previously updated)

    $$.initSubchartBrush(); // attach data

    $$.updateTargetsForSubchart($$.getTargets()); // reset fade-in state

    $$.mapToIds($$.data.targets).forEach(function (id) {
      $$.withoutFadeIn[id] = false;
    }); // redraw chart !

    $$.updateAndRedraw(); // update visible targets !

    $$.showTargets();
  };

  Chart.prototype.subchart.hide = function () {
    var $$ = this.internal;

    if (!$$.config.subchart_show) {
      return;
    }

    $$.config.subchart_show = false; // remove DOM

    $$.removeSubchart(); // re-render chart

    $$.redraw();
  };

  Chart.prototype.tooltip = function () {};

  Chart.prototype.tooltip.show = function (args) {
    var $$ = this.internal,
        targets,
        data,
        mouse = {}; // determine mouse position on the chart

    if (args.mouse) {
      mouse = args.mouse;
    } else {
      // determine focus data
      if (args.data) {
        data = args.data;
      } else if (typeof args.x !== 'undefined') {
        if (args.id) {
          targets = $$.data.targets.filter(function (t) {
            return t.id === args.id;
          });
        } else {
          targets = $$.data.targets;
        }

        data = $$.filterByX(targets, args.x).slice(0, 1)[0];
      }

      mouse = data ? $$.getMousePosition(data) : null;
    } // emulate mouse events to show


    $$.dispatchEvent('mousemove', mouse);
    $$.config.tooltip_onshow.call($$, data);
  };

  Chart.prototype.tooltip.hide = function () {
    // TODO: get target data by checking the state of focus
    this.internal.dispatchEvent('mouseout', 0);
    this.internal.config.tooltip_onhide.call(this);
  };

  Chart.prototype.transform = function (type, targetIds) {
    var $$ = this.internal,
        options = ['pie', 'donut'].indexOf(type) >= 0 ? {
      withTransform: true
    } : null;
    $$.transformTo(targetIds, type, options);
  };

  ChartInternal.prototype.transformTo = function (targetIds, type, optionsForRedraw) {
    var $$ = this,
        withTransitionForAxis = !$$.hasArcType(),
        options = optionsForRedraw || {
      withTransitionForAxis: withTransitionForAxis
    };
    options.withTransitionForTransform = false;
    $$.transiting = false;
    $$.setTargetType(targetIds, type);
    $$.updateTargets($$.data.targets); // this is needed when transforming to arc

    $$.updateAndRedraw(options);
  };

  Chart.prototype.x = function (x) {
    var $$ = this.internal;

    if (arguments.length) {
      $$.updateTargetX($$.data.targets, x);
      $$.redraw({
        withUpdateOrgXDomain: true,
        withUpdateXDomain: true
      });
    }

    return $$.data.xs;
  };

  Chart.prototype.xs = function (xs) {
    var $$ = this.internal;

    if (arguments.length) {
      $$.updateTargetXs($$.data.targets, xs);
      $$.redraw({
        withUpdateOrgXDomain: true,
        withUpdateXDomain: true
      });
    }

    return $$.data.xs;
  };

  Chart.prototype.zoom = function (domain) {
    var $$ = this.internal;

    if (domain) {
      if ($$.isTimeSeries()) {
        domain = domain.map(function (x) {
          return $$.parseDate(x);
        });
      }

      if ($$.config.subchart_show) {
        $$.brush.selectionAsValue(domain, true);
      } else {
        $$.updateXDomain(null, true, false, false, domain);
        $$.redraw({
          withY: $$.config.zoom_rescale,
          withSubchart: false
        });
      }

      $$.config.zoom_onzoom.call(this, $$.x.orgDomain());
      return domain;
    } else {
      return $$.x.domain();
    }
  };

  Chart.prototype.zoom.enable = function (enabled) {
    var $$ = this.internal;
    $$.config.zoom_enabled = enabled;
    $$.updateAndRedraw();
  };

  Chart.prototype.unzoom = function () {
    var $$ = this.internal;

    if ($$.config.subchart_show) {
      $$.brush.clear();
    } else {
      $$.updateXDomain(null, true, false, false, $$.subX.domain());
      $$.redraw({
        withY: $$.config.zoom_rescale,
        withSubchart: false
      });
    }
  };

  Chart.prototype.zoom.max = function (max) {
    var $$ = this.internal,
        config = $$.config,
        d3 = $$.d3;

    if (max === 0 || max) {
      config.zoom_x_max = d3.max([$$.orgXDomain[1], max]);
    } else {
      return config.zoom_x_max;
    }
  };

  Chart.prototype.zoom.min = function (min) {
    var $$ = this.internal,
        config = $$.config,
        d3 = $$.d3;

    if (min === 0 || min) {
      config.zoom_x_min = d3.min([$$.orgXDomain[0], min]);
    } else {
      return config.zoom_x_min;
    }
  };

  Chart.prototype.zoom.range = function (range) {
    if (arguments.length) {
      if (isDefined(range.max)) {
        this.domain.max(range.max);
      }

      if (isDefined(range.min)) {
        this.domain.min(range.min);
      }
    } else {
      return {
        max: this.domain.max(),
        min: this.domain.min()
      };
    }
  };

  ChartInternal.prototype.initPie = function () {
    var $$ = this,
        d3 = $$.d3;
    $$.pie = d3.pie().padAngle(this.getPadAngle.bind(this)).value(function (d) {
      return d.values.reduce(function (a, b) {
        return a + b.value;
      }, 0);
    });
    var orderFct = $$.getOrderFunction(); // we need to reverse the returned order if asc or desc to have the slice in expected order.

    if (orderFct && ($$.isOrderAsc() || $$.isOrderDesc())) {
      var defaultSort = orderFct;

      orderFct = function orderFct(t1, t2) {
        return defaultSort(t1, t2) * -1;
      };
    }

    $$.pie.sort(orderFct || null);
  };

  ChartInternal.prototype.updateRadius = function () {
    var $$ = this,
        config = $$.config,
        w = config.gauge_width || config.donut_width,
        gaugeArcWidth = $$.filterTargetsToShow($$.data.targets).length * $$.config.gauge_arcs_minWidth;
    $$.radiusExpanded = Math.min($$.arcWidth, $$.arcHeight) / 2 * ($$.hasType('gauge') ? 0.85 : 1);
    $$.radius = $$.radiusExpanded * 0.95;
    $$.innerRadiusRatio = w ? ($$.radius - w) / $$.radius : 0.6;
    $$.innerRadius = $$.hasType('donut') || $$.hasType('gauge') ? $$.radius * $$.innerRadiusRatio : 0;
    $$.gaugeArcWidth = w ? w : gaugeArcWidth <= $$.radius - $$.innerRadius ? $$.radius - $$.innerRadius : gaugeArcWidth <= $$.radius ? gaugeArcWidth : $$.radius;
  };

  ChartInternal.prototype.getPadAngle = function () {
    if (this.hasType('pie')) {
      return this.config.pie_padAngle || 0;
    } else if (this.hasType('donut')) {
      return this.config.donut_padAngle || 0;
    } else {
      return 0;
    }
  };

  ChartInternal.prototype.updateArc = function () {
    var $$ = this;
    $$.svgArc = $$.getSvgArc();
    $$.svgArcExpanded = $$.getSvgArcExpanded();
    $$.svgArcExpandedSub = $$.getSvgArcExpanded(0.98);
  };

  ChartInternal.prototype.updateAngle = function (d) {
    var $$ = this,
        config = $$.config,
        found = false,
        index = 0,
        gMin,
        gMax,
        gTic,
        gValue;

    if (!config) {
      return null;
    }

    $$.pie($$.filterTargetsToShow($$.data.targets)).forEach(function (t) {
      if (!found && t.data.id === d.data.id) {
        found = true;
        d = t;
        d.index = index;
      }

      index++;
    });

    if (isNaN(d.startAngle)) {
      d.startAngle = 0;
    }

    if (isNaN(d.endAngle)) {
      d.endAngle = d.startAngle;
    }

    if ($$.isGaugeType(d.data)) {
      gMin = config.gauge_min;
      gMax = config.gauge_max;
      gTic = Math.PI * (config.gauge_fullCircle ? 2 : 1) / (gMax - gMin);
      gValue = d.value < gMin ? 0 : d.value < gMax ? d.value - gMin : gMax - gMin;
      d.startAngle = config.gauge_startingAngle;
      d.endAngle = d.startAngle + gTic * gValue;
    }

    return found ? d : null;
  };

  ChartInternal.prototype.getSvgArc = function () {
    var $$ = this,
        hasGaugeType = $$.hasType('gauge'),
        singleArcWidth = $$.gaugeArcWidth / $$.filterTargetsToShow($$.data.targets).length,
        arc = $$.d3.arc().outerRadius(function (d) {
      return hasGaugeType ? $$.radius - singleArcWidth * d.index : $$.radius;
    }).innerRadius(function (d) {
      return hasGaugeType ? $$.radius - singleArcWidth * (d.index + 1) : $$.innerRadius;
    }),
        newArc = function newArc(d, withoutUpdate) {
      var updated;

      if (withoutUpdate) {
        return arc(d);
      } // for interpolate


      updated = $$.updateAngle(d);
      return updated ? arc(updated) : "M 0 0";
    }; // TODO: extends all function


    newArc.centroid = arc.centroid;
    return newArc;
  };

  ChartInternal.prototype.getSvgArcExpanded = function (rate) {
    rate = rate || 1;
    var $$ = this,
        hasGaugeType = $$.hasType('gauge'),
        singleArcWidth = $$.gaugeArcWidth / $$.filterTargetsToShow($$.data.targets).length,
        expandWidth = Math.min($$.radiusExpanded * rate - $$.radius, singleArcWidth * 0.8 - (1 - rate) * 100),
        arc = $$.d3.arc().outerRadius(function (d) {
      return hasGaugeType ? $$.radius - singleArcWidth * d.index + expandWidth : $$.radiusExpanded * rate;
    }).innerRadius(function (d) {
      return hasGaugeType ? $$.radius - singleArcWidth * (d.index + 1) : $$.innerRadius;
    });
    return function (d) {
      var updated = $$.updateAngle(d);
      return updated ? arc(updated) : "M 0 0";
    };
  };

  ChartInternal.prototype.getArc = function (d, withoutUpdate, force) {
    return force || this.isArcType(d.data) ? this.svgArc(d, withoutUpdate) : "M 0 0";
  };

  ChartInternal.prototype.transformForArcLabel = function (d) {
    var $$ = this,
        config = $$.config,
        updated = $$.updateAngle(d),
        c,
        x,
        y,
        h,
        ratio,
        translate = "",
        hasGauge = $$.hasType('gauge');

    if (updated && !hasGauge) {
      c = this.svgArc.centroid(updated);
      x = isNaN(c[0]) ? 0 : c[0];
      y = isNaN(c[1]) ? 0 : c[1];
      h = Math.sqrt(x * x + y * y);

      if ($$.hasType('donut') && config.donut_label_ratio) {
        ratio = isFunction(config.donut_label_ratio) ? config.donut_label_ratio(d, $$.radius, h) : config.donut_label_ratio;
      } else if ($$.hasType('pie') && config.pie_label_ratio) {
        ratio = isFunction(config.pie_label_ratio) ? config.pie_label_ratio(d, $$.radius, h) : config.pie_label_ratio;
      } else {
        ratio = $$.radius && h ? (36 / $$.radius > 0.375 ? 1.175 - 36 / $$.radius : 0.8) * $$.radius / h : 0;
      }

      translate = "translate(" + x * ratio + ',' + y * ratio + ")";
    } else if (updated && hasGauge && $$.filterTargetsToShow($$.data.targets).length > 1) {
      var y1 = Math.sin(updated.endAngle - Math.PI / 2);
      x = Math.cos(updated.endAngle - Math.PI / 2) * ($$.radiusExpanded + 25);
      y = y1 * ($$.radiusExpanded + 15 - Math.abs(y1 * 10)) + 3;
      translate = "translate(" + x + ',' + y + ")";
    }

    return translate;
  };
  /**
   * @deprecated Use `getRatio('arc', d)` instead.
   */


  ChartInternal.prototype.getArcRatio = function (d) {
    return this.getRatio('arc', d);
  };

  ChartInternal.prototype.convertToArcData = function (d) {
    return this.addName({
      id: d.data.id,
      value: d.value,
      ratio: this.getRatio('arc', d),
      index: d.index
    });
  };

  ChartInternal.prototype.textForArcLabel = function (d) {
    var $$ = this,
        updated,
        value,
        ratio,
        id,
        format;

    if (!$$.shouldShowArcLabel()) {
      return "";
    }

    updated = $$.updateAngle(d);
    value = updated ? updated.value : null;
    ratio = $$.getRatio('arc', updated);
    id = d.data.id;

    if (!$$.hasType('gauge') && !$$.meetsArcLabelThreshold(ratio)) {
      return "";
    }

    format = $$.getArcLabelFormat();
    return format ? format(value, ratio, id) : $$.defaultArcValueFormat(value, ratio);
  };

  ChartInternal.prototype.textForGaugeMinMax = function (value, isMax) {
    var $$ = this,
        format = $$.getGaugeLabelExtents();
    return format ? format(value, isMax) : value;
  };

  ChartInternal.prototype.expandArc = function (targetIds) {
    var $$ = this,
        interval; // MEMO: avoid to cancel transition

    if ($$.transiting) {
      interval = window.setInterval(function () {
        if (!$$.transiting) {
          window.clearInterval(interval);

          if ($$.legend.selectAll('.c3-legend-item-focused').size() > 0) {
            $$.expandArc(targetIds);
          }
        }
      }, 10);
      return;
    }

    targetIds = $$.mapToTargetIds(targetIds);
    $$.svg.selectAll($$.selectorTargets(targetIds, '.' + CLASS.chartArc)).each(function (d) {
      if (!$$.shouldExpand(d.data.id)) {
        return;
      }

      $$.d3.select(this).selectAll('path').transition().duration($$.expandDuration(d.data.id)).attr("d", $$.svgArcExpanded).transition().duration($$.expandDuration(d.data.id) * 2).attr("d", $$.svgArcExpandedSub).each(function (d) {
        if ($$.isDonutType(d.data)) ;
      });
    });
  };

  ChartInternal.prototype.unexpandArc = function (targetIds) {
    var $$ = this;

    if ($$.transiting) {
      return;
    }

    targetIds = $$.mapToTargetIds(targetIds);
    $$.svg.selectAll($$.selectorTargets(targetIds, '.' + CLASS.chartArc)).selectAll('path').transition().duration(function (d) {
      return $$.expandDuration(d.data.id);
    }).attr("d", $$.svgArc);
    $$.svg.selectAll('.' + CLASS.arc);
  };

  ChartInternal.prototype.expandDuration = function (id) {
    var $$ = this,
        config = $$.config;

    if ($$.isDonutType(id)) {
      return config.donut_expand_duration;
    } else if ($$.isGaugeType(id)) {
      return config.gauge_expand_duration;
    } else if ($$.isPieType(id)) {
      return config.pie_expand_duration;
    } else {
      return 50;
    }
  };

  ChartInternal.prototype.shouldExpand = function (id) {
    var $$ = this,
        config = $$.config;
    return $$.isDonutType(id) && config.donut_expand || $$.isGaugeType(id) && config.gauge_expand || $$.isPieType(id) && config.pie_expand;
  };

  ChartInternal.prototype.shouldShowArcLabel = function () {
    var $$ = this,
        config = $$.config,
        shouldShow = true;

    if ($$.hasType('donut')) {
      shouldShow = config.donut_label_show;
    } else if ($$.hasType('pie')) {
      shouldShow = config.pie_label_show;
    } // when gauge, always true


    return shouldShow;
  };

  ChartInternal.prototype.meetsArcLabelThreshold = function (ratio) {
    var $$ = this,
        config = $$.config,
        threshold = $$.hasType('donut') ? config.donut_label_threshold : config.pie_label_threshold;
    return ratio >= threshold;
  };

  ChartInternal.prototype.getArcLabelFormat = function () {
    var $$ = this,
        config = $$.config,
        format = config.pie_label_format;

    if ($$.hasType('gauge')) {
      format = config.gauge_label_format;
    } else if ($$.hasType('donut')) {
      format = config.donut_label_format;
    }

    return format;
  };

  ChartInternal.prototype.getGaugeLabelExtents = function () {
    var $$ = this,
        config = $$.config;
    return config.gauge_label_extents;
  };

  ChartInternal.prototype.getArcTitle = function () {
    var $$ = this;
    return $$.hasType('donut') ? $$.config.donut_title : "";
  };

  ChartInternal.prototype.updateTargetsForArc = function (targets) {
    var $$ = this,
        main = $$.main,
        mainPies,
        mainPieEnter,
        classChartArc = $$.classChartArc.bind($$),
        classArcs = $$.classArcs.bind($$),
        classFocus = $$.classFocus.bind($$);
    mainPies = main.select('.' + CLASS.chartArcs).selectAll('.' + CLASS.chartArc).data($$.pie(targets)).attr("class", function (d) {
      return classChartArc(d) + classFocus(d.data);
    });
    mainPieEnter = mainPies.enter().append("g").attr("class", classChartArc);
    mainPieEnter.append('g').attr('class', classArcs);
    mainPieEnter.append("text").attr("dy", $$.hasType('gauge') ? "-.1em" : ".35em").style("opacity", 0).style("text-anchor", "middle").style("pointer-events", "none"); // MEMO: can not keep same color..., but not bad to update color in redraw
    //mainPieUpdate.exit().remove();
  };

  ChartInternal.prototype.initArc = function () {
    var $$ = this;
    $$.arcs = $$.main.select('.' + CLASS.chart).append("g").attr("class", CLASS.chartArcs).attr("transform", $$.getTranslate('arc'));
    $$.arcs.append('text').attr('class', CLASS.chartArcsTitle).style("text-anchor", "middle").text($$.getArcTitle());
  };

  ChartInternal.prototype.redrawArc = function (duration, durationForExit, withTransform) {
    var $$ = this,
        d3 = $$.d3,
        config = $$.config,
        main = $$.main,
        arcs,
        mainArc,
        arcLabelLines,
        mainArcLabelLine,
        hasGaugeType = $$.hasType('gauge');
    arcs = main.selectAll('.' + CLASS.arcs).selectAll('.' + CLASS.arc).data($$.arcData.bind($$));
    mainArc = arcs.enter().append('path').attr("class", $$.classArc.bind($$)).style("fill", function (d) {
      return $$.color(d.data);
    }).style("cursor", function (d) {
      return config.interaction_enabled && config.data_selection_isselectable(d) ? "pointer" : null;
    }).each(function (d) {
      if ($$.isGaugeType(d.data)) {
        d.startAngle = d.endAngle = config.gauge_startingAngle;
      }

      this._current = d;
    }).merge(arcs);

    if (hasGaugeType) {
      arcLabelLines = main.selectAll('.' + CLASS.arcs).selectAll('.' + CLASS.arcLabelLine).data($$.arcData.bind($$));
      mainArcLabelLine = arcLabelLines.enter().append('rect').attr("class", function (d) {
        return CLASS.arcLabelLine + ' ' + CLASS.target + ' ' + CLASS.target + '-' + d.data.id;
      }).merge(arcLabelLines);

      if ($$.filterTargetsToShow($$.data.targets).length === 1) {
        mainArcLabelLine.style("display", "none");
      } else {
        mainArcLabelLine.style("fill", function (d) {
          return $$.levelColor ? $$.levelColor(d.data.values.reduce(function (total, item) {
            return total + item.value;
          }, 0)) : $$.color(d.data);
        }).style("display", config.gauge_labelLine_show ? "" : "none").each(function (d) {
          var lineLength = 0,
              lineThickness = 2,
              x = 0,
              y = 0,
              transform = "";

          if ($$.hiddenTargetIds.indexOf(d.data.id) < 0) {
            var updated = $$.updateAngle(d),
                innerLineLength = $$.gaugeArcWidth / $$.filterTargetsToShow($$.data.targets).length * (updated.index + 1),
                lineAngle = updated.endAngle - Math.PI / 2,
                arcInnerRadius = $$.radius - innerLineLength,
                linePositioningAngle = lineAngle - (arcInnerRadius === 0 ? 0 : 1 / arcInnerRadius);
            lineLength = $$.radiusExpanded - $$.radius + innerLineLength;
            x = Math.cos(linePositioningAngle) * arcInnerRadius;
            y = Math.sin(linePositioningAngle) * arcInnerRadius;
            transform = "rotate(" + lineAngle * 180 / Math.PI + ", " + x + ", " + y + ")";
          }

          d3.select(this).attr('x', x).attr('y', y).attr('width', lineLength).attr('height', lineThickness).attr('transform', transform).style("stroke-dasharray", "0, " + (lineLength + lineThickness) + ", 0");
        });
      }
    }

    mainArc.attr("transform", function (d) {
      return !$$.isGaugeType(d.data) && withTransform ? "scale(0)" : "";
    }).on('mouseover', config.interaction_enabled ? function (d) {
      var updated, arcData;

      if ($$.transiting) {
        // skip while transiting
        return;
      }

      updated = $$.updateAngle(d);

      if (updated) {
        arcData = $$.convertToArcData(updated); // transitions

        $$.expandArc(updated.data.id);
        $$.api.focus(updated.data.id);
        $$.toggleFocusLegend(updated.data.id, true);
        $$.config.data_onmouseover(arcData, this);
      }
    } : null).on('mousemove', config.interaction_enabled ? function (d) {
      var updated = $$.updateAngle(d),
          arcData,
          selectedData;

      if (updated) {
        arcData = $$.convertToArcData(updated), selectedData = [arcData];
        $$.showTooltip(selectedData, this);
      }
    } : null).on('mouseout', config.interaction_enabled ? function (d) {
      var updated, arcData;

      if ($$.transiting) {
        // skip while transiting
        return;
      }

      updated = $$.updateAngle(d);

      if (updated) {
        arcData = $$.convertToArcData(updated); // transitions

        $$.unexpandArc(updated.data.id);
        $$.api.revert();
        $$.revertLegend();
        $$.hideTooltip();
        $$.config.data_onmouseout(arcData, this);
      }
    } : null).on('click', config.interaction_enabled ? function (d, i) {
      var updated = $$.updateAngle(d),
          arcData;

      if (updated) {
        arcData = $$.convertToArcData(updated);

        if ($$.toggleShape) {
          $$.toggleShape(this, arcData, i);
        }

        $$.config.data_onclick.call($$.api, arcData, this);
      }
    } : null).each(function () {
      $$.transiting = true;
    }).transition().duration(duration).attrTween("d", function (d) {
      var updated = $$.updateAngle(d),
          interpolate;

      if (!updated) {
        return function () {
          return "M 0 0";
        };
      } //                if (this._current === d) {
      //                    this._current = {
      //                        startAngle: Math.PI*2,
      //                        endAngle: Math.PI*2,
      //                    };
      //                }


      if (isNaN(this._current.startAngle)) {
        this._current.startAngle = 0;
      }

      if (isNaN(this._current.endAngle)) {
        this._current.endAngle = this._current.startAngle;
      }

      interpolate = d3.interpolate(this._current, updated);
      this._current = interpolate(0);
      return function (t) {
        // prevents crashing the charts once in transition and chart.destroy() has been called
        if ($$.config === null) {
          return "M 0 0";
        }

        var interpolated = interpolate(t);
        interpolated.data = d.data; // data.id will be updated by interporator

        return $$.getArc(interpolated, true);
      };
    }).attr("transform", withTransform ? "scale(1)" : "").style("fill", function (d) {
      return $$.levelColor ? $$.levelColor(d.data.values.reduce(function (total, item) {
        return total + item.value;
      }, 0)) : $$.color(d.data.id);
    }) // Where gauge reading color would receive customization.
    .call($$.endall, function () {
      $$.transiting = false;
    });
    arcs.exit().transition().duration(durationForExit).style('opacity', 0).remove();
    main.selectAll('.' + CLASS.chartArc).select('text').style("opacity", 0).attr('class', function (d) {
      return $$.isGaugeType(d.data) ? CLASS.gaugeValue : '';
    }).text($$.textForArcLabel.bind($$)).attr("transform", $$.transformForArcLabel.bind($$)).style('font-size', function (d) {
      return $$.isGaugeType(d.data) && $$.filterTargetsToShow($$.data.targets).length === 1 ? Math.round($$.radius / 5) + 'px' : '';
    }).transition().duration(duration).style("opacity", function (d) {
      return $$.isTargetToShow(d.data.id) && $$.isArcType(d.data) ? 1 : 0;
    });
    main.select('.' + CLASS.chartArcsTitle).style("opacity", $$.hasType('donut') || hasGaugeType ? 1 : 0);

    if (hasGaugeType) {
      var index = 0;
      var backgroundArc = $$.arcs.select('g.' + CLASS.chartArcsBackground).selectAll('path.' + CLASS.chartArcsBackground).data($$.data.targets);
      backgroundArc.enter().append("path").attr("class", function (d, i) {
        return CLASS.chartArcsBackground + ' ' + CLASS.chartArcsBackground + '-' + i;
      }).merge(backgroundArc).attr("d", function (d1) {
        if ($$.hiddenTargetIds.indexOf(d1.id) >= 0) {
          return "M 0 0";
        }

        var d = {
          data: [{
            value: config.gauge_max
          }],
          startAngle: config.gauge_startingAngle,
          endAngle: -1 * config.gauge_startingAngle * (config.gauge_fullCircle ? Math.PI : 1),
          index: index++
        };
        return $$.getArc(d, true, true);
      });
      backgroundArc.exit().remove();
      $$.arcs.select('.' + CLASS.chartArcsGaugeUnit).attr("dy", ".75em").text(config.gauge_label_show ? config.gauge_units : '');
      $$.arcs.select('.' + CLASS.chartArcsGaugeMin).attr("dx", -1 * ($$.innerRadius + ($$.radius - $$.innerRadius) / (config.gauge_fullCircle ? 1 : 2)) + "px").attr("dy", "1.2em").text(config.gauge_label_show ? $$.textForGaugeMinMax(config.gauge_min, false) : '');
      $$.arcs.select('.' + CLASS.chartArcsGaugeMax).attr("dx", $$.innerRadius + ($$.radius - $$.innerRadius) / (config.gauge_fullCircle ? 1 : 2) + "px").attr("dy", "1.2em").text(config.gauge_label_show ? $$.textForGaugeMinMax(config.gauge_max, true) : '');
    }
  };

  ChartInternal.prototype.initGauge = function () {
    var arcs = this.arcs;

    if (this.hasType('gauge')) {
      arcs.append('g').attr("class", CLASS.chartArcsBackground);
      arcs.append("text").attr("class", CLASS.chartArcsGaugeUnit).style("text-anchor", "middle").style("pointer-events", "none");
      arcs.append("text").attr("class", CLASS.chartArcsGaugeMin).style("text-anchor", "middle").style("pointer-events", "none");
      arcs.append("text").attr("class", CLASS.chartArcsGaugeMax).style("text-anchor", "middle").style("pointer-events", "none");
    }
  };

  ChartInternal.prototype.getGaugeLabelHeight = function () {
    return this.config.gauge_label_show ? 20 : 0;
  };

  /**
   * Store value into cache
   *
   * @param key
   * @param value
   */

  ChartInternal.prototype.addToCache = function (key, value) {
    this.cache["$".concat(key)] = value;
  };
  /**
   * Returns a cached value or undefined
   *
   * @param key
   * @return {*}
   */


  ChartInternal.prototype.getFromCache = function (key) {
    return this.cache["$".concat(key)];
  };
  /**
   * Reset cached data
   */


  ChartInternal.prototype.resetCache = function () {
    var _this = this;

    Object.keys(this.cache).filter(function (key) {
      return /^\$/.test(key);
    }).forEach(function (key) {
      delete _this.cache[key];
    });
  }; // Old API that stores Targets


  ChartInternal.prototype.hasCaches = function (ids) {
    for (var i = 0; i < ids.length; i++) {
      if (!(ids[i] in this.cache)) {
        return false;
      }
    }

    return true;
  };

  ChartInternal.prototype.addCache = function (id, target) {
    this.cache[id] = this.cloneTarget(target);
  };

  ChartInternal.prototype.getCaches = function (ids) {
    var targets = [],
        i;

    for (i = 0; i < ids.length; i++) {
      if (ids[i] in this.cache) {
        targets.push(this.cloneTarget(this.cache[ids[i]]));
      }
    }

    return targets;
  };

  ChartInternal.prototype.categoryName = function (i) {
    var config = this.config;
    return i < config.axis_x_categories.length ? config.axis_x_categories[i] : i;
  };

  ChartInternal.prototype.generateTargetClass = function (targetId) {
    return targetId || targetId === 0 ? ('-' + targetId).replace(/\s/g, '-') : '';
  };

  ChartInternal.prototype.generateClass = function (prefix, targetId) {
    return " " + prefix + " " + prefix + this.generateTargetClass(targetId);
  };

  ChartInternal.prototype.classText = function (d) {
    return this.generateClass(CLASS.text, d.index);
  };

  ChartInternal.prototype.classTexts = function (d) {
    return this.generateClass(CLASS.texts, d.id);
  };

  ChartInternal.prototype.classShape = function (d) {
    return this.generateClass(CLASS.shape, d.index);
  };

  ChartInternal.prototype.classShapes = function (d) {
    return this.generateClass(CLASS.shapes, d.id);
  };

  ChartInternal.prototype.classLine = function (d) {
    return this.classShape(d) + this.generateClass(CLASS.line, d.id);
  };

  ChartInternal.prototype.classLines = function (d) {
    return this.classShapes(d) + this.generateClass(CLASS.lines, d.id);
  };

  ChartInternal.prototype.classCircle = function (d) {
    return this.classShape(d) + this.generateClass(CLASS.circle, d.index);
  };

  ChartInternal.prototype.classCircles = function (d) {
    return this.classShapes(d) + this.generateClass(CLASS.circles, d.id);
  };

  ChartInternal.prototype.classBar = function (d) {
    return this.classShape(d) + this.generateClass(CLASS.bar, d.index);
  };

  ChartInternal.prototype.classBars = function (d) {
    return this.classShapes(d) + this.generateClass(CLASS.bars, d.id);
  };

  ChartInternal.prototype.classArc = function (d) {
    return this.classShape(d.data) + this.generateClass(CLASS.arc, d.data.id);
  };

  ChartInternal.prototype.classArcs = function (d) {
    return this.classShapes(d.data) + this.generateClass(CLASS.arcs, d.data.id);
  };

  ChartInternal.prototype.classArea = function (d) {
    return this.classShape(d) + this.generateClass(CLASS.area, d.id);
  };

  ChartInternal.prototype.classAreas = function (d) {
    return this.classShapes(d) + this.generateClass(CLASS.areas, d.id);
  };

  ChartInternal.prototype.classRegion = function (d, i) {
    return this.generateClass(CLASS.region, i) + ' ' + ('class' in d ? d['class'] : '');
  };

  ChartInternal.prototype.classEvent = function (d) {
    return this.generateClass(CLASS.eventRect, d.index);
  };

  ChartInternal.prototype.classTarget = function (id) {
    var $$ = this;
    var additionalClassSuffix = $$.config.data_classes[id],
        additionalClass = '';

    if (additionalClassSuffix) {
      additionalClass = ' ' + CLASS.target + '-' + additionalClassSuffix;
    }

    return $$.generateClass(CLASS.target, id) + additionalClass;
  };

  ChartInternal.prototype.classFocus = function (d) {
    return this.classFocused(d) + this.classDefocused(d);
  };

  ChartInternal.prototype.classFocused = function (d) {
    return ' ' + (this.focusedTargetIds.indexOf(d.id) >= 0 ? CLASS.focused : '');
  };

  ChartInternal.prototype.classDefocused = function (d) {
    return ' ' + (this.defocusedTargetIds.indexOf(d.id) >= 0 ? CLASS.defocused : '');
  };

  ChartInternal.prototype.classChartText = function (d) {
    return CLASS.chartText + this.classTarget(d.id);
  };

  ChartInternal.prototype.classChartLine = function (d) {
    return CLASS.chartLine + this.classTarget(d.id);
  };

  ChartInternal.prototype.classChartBar = function (d) {
    return CLASS.chartBar + this.classTarget(d.id);
  };

  ChartInternal.prototype.classChartArc = function (d) {
    return CLASS.chartArc + this.classTarget(d.data.id);
  };

  ChartInternal.prototype.getTargetSelectorSuffix = function (targetId) {
    var targetClass = this.generateTargetClass(targetId);

    if (window.CSS && window.CSS.escape) {
      return window.CSS.escape(targetClass);
    } // fallback on imperfect method for old browsers (does not handles unicode)


    return targetClass.replace(/([?!@#$%^&*()=+,.<>'":;\[\]\/|~`{}\\])/g, '\\$1');
  };

  ChartInternal.prototype.selectorTarget = function (id, prefix) {
    return (prefix || '') + '.' + CLASS.target + this.getTargetSelectorSuffix(id);
  };

  ChartInternal.prototype.selectorTargets = function (ids, prefix) {
    var $$ = this;
    ids = ids || [];
    return ids.length ? ids.map(function (id) {
      return $$.selectorTarget(id, prefix);
    }) : null;
  };

  ChartInternal.prototype.selectorLegend = function (id) {
    return '.' + CLASS.legendItem + this.getTargetSelectorSuffix(id);
  };

  ChartInternal.prototype.selectorLegends = function (ids) {
    var $$ = this;
    return ids && ids.length ? ids.map(function (id) {
      return $$.selectorLegend(id);
    }) : null;
  };

  ChartInternal.prototype.getClipPath = function (id) {
    return "url(" + (isIE(9) ? "" : document.URL.split('#')[0]) + "#" + id + ")";
  };

  ChartInternal.prototype.appendClip = function (parent, id) {
    return parent.append("clipPath").attr("id", id).append("rect");
  };

  ChartInternal.prototype.getAxisClipX = function (forHorizontal) {
    // axis line width + padding for left
    var left = Math.max(30, this.margin.left);
    return forHorizontal ? -(1 + left) : -(left - 1);
  };

  ChartInternal.prototype.getAxisClipY = function (forHorizontal) {
    return forHorizontal ? -20 : -this.margin.top;
  };

  ChartInternal.prototype.getXAxisClipX = function () {
    var $$ = this;
    return $$.getAxisClipX(!$$.config.axis_rotated);
  };

  ChartInternal.prototype.getXAxisClipY = function () {
    var $$ = this;
    return $$.getAxisClipY(!$$.config.axis_rotated);
  };

  ChartInternal.prototype.getYAxisClipX = function () {
    var $$ = this;
    return $$.config.axis_y_inner ? -1 : $$.getAxisClipX($$.config.axis_rotated);
  };

  ChartInternal.prototype.getYAxisClipY = function () {
    var $$ = this;
    return $$.getAxisClipY($$.config.axis_rotated);
  };

  ChartInternal.prototype.getAxisClipWidth = function (forHorizontal) {
    var $$ = this,
        left = Math.max(30, $$.margin.left),
        right = Math.max(30, $$.margin.right); // width + axis line width + padding for left/right

    return forHorizontal ? $$.width + 2 + left + right : $$.margin.left + 20;
  };

  ChartInternal.prototype.getAxisClipHeight = function (forHorizontal) {
    // less than 20 is not enough to show the axis label 'outer' without legend
    return (forHorizontal ? this.margin.bottom : this.margin.top + this.height) + 20;
  };

  ChartInternal.prototype.getXAxisClipWidth = function () {
    var $$ = this;
    return $$.getAxisClipWidth(!$$.config.axis_rotated);
  };

  ChartInternal.prototype.getXAxisClipHeight = function () {
    var $$ = this;
    return $$.getAxisClipHeight(!$$.config.axis_rotated);
  };

  ChartInternal.prototype.getYAxisClipWidth = function () {
    var $$ = this;
    return $$.getAxisClipWidth($$.config.axis_rotated) + ($$.config.axis_y_inner ? 20 : 0);
  };

  ChartInternal.prototype.getYAxisClipHeight = function () {
    var $$ = this;
    return $$.getAxisClipHeight($$.config.axis_rotated);
  };

  ChartInternal.prototype.generateColor = function () {
    var $$ = this,
        config = $$.config,
        d3 = $$.d3,
        colors = config.data_colors,
        pattern = notEmpty(config.color_pattern) ? config.color_pattern : d3.schemeCategory10,
        callback = config.data_color,
        ids = [];
    return function (d) {
      var id = d.id || d.data && d.data.id || d,
          color; // if callback function is provided

      if (colors[id] instanceof Function) {
        color = colors[id](d);
      } // if specified, choose that color
      else if (colors[id]) {
          color = colors[id];
        } // if not specified, choose from pattern
        else {
            if (ids.indexOf(id) < 0) {
              ids.push(id);
            }

            color = pattern[ids.indexOf(id) % pattern.length];
            colors[id] = color;
          }

      return callback instanceof Function ? callback(color, d) : color;
    };
  };

  ChartInternal.prototype.generateLevelColor = function () {
    var $$ = this,
        config = $$.config,
        colors = config.color_pattern,
        threshold = config.color_threshold,
        asValue = threshold.unit === 'value',
        values = threshold.values && threshold.values.length ? threshold.values : [],
        max = threshold.max || 100;
    return notEmpty(threshold) && notEmpty(colors) ? function (value) {
      var i,
          v,
          color = colors[colors.length - 1];

      for (i = 0; i < values.length; i++) {
        v = asValue ? value : value * 100 / max;

        if (v < values[i]) {
          color = colors[i];
          break;
        }
      }

      return color;
    } : null;
  };

  ChartInternal.prototype.getDefaultConfig = function () {
    var config = {
      bindto: '#chart',
      svg_classname: undefined,
      size_width: undefined,
      size_height: undefined,
      padding_left: undefined,
      padding_right: undefined,
      padding_top: undefined,
      padding_bottom: undefined,
      resize_auto: true,
      zoom_enabled: false,
      zoom_initialRange: undefined,
      zoom_type: 'scroll',
      zoom_disableDefaultBehavior: false,
      zoom_privileged: false,
      zoom_rescale: false,
      zoom_onzoom: function zoom_onzoom() {},
      zoom_onzoomstart: function zoom_onzoomstart() {},
      zoom_onzoomend: function zoom_onzoomend() {},
      zoom_x_min: undefined,
      zoom_x_max: undefined,
      interaction_brighten: true,
      interaction_enabled: true,
      onmouseover: function onmouseover() {},
      onmouseout: function onmouseout() {},
      onresize: function onresize() {},
      onresized: function onresized() {},
      oninit: function oninit() {},
      onrendered: function onrendered() {},
      transition_duration: 350,
      data_epochs: 'epochs',
      data_x: undefined,
      data_xs: {},
      data_xFormat: '%Y-%m-%d',
      data_xLocaltime: true,
      data_xSort: true,
      data_idConverter: function data_idConverter(id) {
        return id;
      },
      data_names: {},
      data_classes: {},
      data_groups: [],
      data_axes: {},
      data_type: undefined,
      data_types: {},
      data_labels: {},
      data_order: 'desc',
      data_regions: {},
      data_color: undefined,
      data_colors: {},
      data_hide: false,
      data_filter: undefined,
      data_selection_enabled: false,
      data_selection_grouped: false,
      data_selection_isselectable: function data_selection_isselectable() {
        return true;
      },
      data_selection_multiple: true,
      data_selection_draggable: false,
      data_stack_normalize: false,
      data_onclick: function data_onclick() {},
      data_onmouseover: function data_onmouseover() {},
      data_onmouseout: function data_onmouseout() {},
      data_onselected: function data_onselected() {},
      data_onunselected: function data_onunselected() {},
      data_url: undefined,
      data_headers: undefined,
      data_json: undefined,
      data_rows: undefined,
      data_columns: undefined,
      data_mimeType: undefined,
      data_keys: undefined,
      // configuration for no plot-able data supplied.
      data_empty_label_text: "",
      // subchart
      subchart_show: false,
      subchart_size_height: 60,
      subchart_axis_x_show: true,
      subchart_onbrush: function subchart_onbrush() {},
      // color
      color_pattern: [],
      color_threshold: {},
      // legend
      legend_show: true,
      legend_hide: false,
      legend_position: 'bottom',
      legend_inset_anchor: 'top-left',
      legend_inset_x: 10,
      legend_inset_y: 0,
      legend_inset_step: undefined,
      legend_item_onclick: undefined,
      legend_item_onmouseover: undefined,
      legend_item_onmouseout: undefined,
      legend_equally: false,
      legend_padding: 0,
      legend_item_tile_width: 10,
      legend_item_tile_height: 10,
      // axis
      axis_rotated: false,
      axis_x_show: true,
      axis_x_type: 'indexed',
      axis_x_localtime: true,
      axis_x_categories: [],
      axis_x_tick_centered: false,
      axis_x_tick_format: undefined,
      axis_x_tick_culling: {},
      axis_x_tick_culling_max: 10,
      axis_x_tick_count: undefined,
      axis_x_tick_fit: true,
      axis_x_tick_values: null,
      axis_x_tick_rotate: 0,
      axis_x_tick_outer: true,
      axis_x_tick_multiline: true,
      axis_x_tick_multilineMax: 0,
      axis_x_tick_width: null,
      axis_x_max: undefined,
      axis_x_min: undefined,
      axis_x_padding: {},
      axis_x_height: undefined,
      axis_x_selection: undefined,
      axis_x_label: {},
      axis_x_inner: undefined,
      axis_y_show: true,
      axis_y_type: 'linear',
      axis_y_max: undefined,
      axis_y_min: undefined,
      axis_y_inverted: false,
      axis_y_center: undefined,
      axis_y_inner: undefined,
      axis_y_label: {},
      axis_y_tick_format: undefined,
      axis_y_tick_outer: true,
      axis_y_tick_values: null,
      axis_y_tick_rotate: 0,
      axis_y_tick_count: undefined,
      axis_y_tick_time_type: undefined,
      axis_y_tick_time_interval: undefined,
      axis_y_padding: {},
      axis_y_default: undefined,
      axis_y2_show: false,
      axis_y2_type: 'linear',
      axis_y2_max: undefined,
      axis_y2_min: undefined,
      axis_y2_inverted: false,
      axis_y2_center: undefined,
      axis_y2_inner: undefined,
      axis_y2_label: {},
      axis_y2_tick_format: undefined,
      axis_y2_tick_outer: true,
      axis_y2_tick_values: null,
      axis_y2_tick_count: undefined,
      axis_y2_padding: {},
      axis_y2_default: undefined,
      // grid
      grid_x_show: false,
      grid_x_type: 'tick',
      grid_x_lines: [],
      grid_y_show: false,
      // not used
      // grid_y_type: 'tick',
      grid_y_lines: [],
      grid_y_ticks: 10,
      grid_focus_show: true,
      grid_lines_front: true,
      // point - point of each data
      point_show: true,
      point_r: 2.5,
      point_sensitivity: 10,
      point_focus_expand_enabled: true,
      point_focus_expand_r: undefined,
      point_select_r: undefined,
      // line
      line_connectNull: false,
      line_step_type: 'step',
      // bar
      bar_width: undefined,
      bar_width_ratio: 0.6,
      bar_width_max: undefined,
      bar_zerobased: true,
      bar_space: 0,
      // area
      area_zerobased: true,
      area_above: false,
      // pie
      pie_label_show: true,
      pie_label_format: undefined,
      pie_label_threshold: 0.05,
      pie_label_ratio: undefined,
      pie_expand: {},
      pie_expand_duration: 50,
      pie_padAngle: 0,
      // gauge
      gauge_fullCircle: false,
      gauge_label_show: true,
      gauge_labelLine_show: true,
      gauge_label_format: undefined,
      gauge_min: 0,
      gauge_max: 100,
      gauge_startingAngle: -1 * Math.PI / 2,
      gauge_label_extents: undefined,
      gauge_units: undefined,
      gauge_width: undefined,
      gauge_arcs_minWidth: 5,
      gauge_expand: {},
      gauge_expand_duration: 50,
      // donut
      donut_label_show: true,
      donut_label_format: undefined,
      donut_label_threshold: 0.05,
      donut_label_ratio: undefined,
      donut_width: undefined,
      donut_title: "",
      donut_expand: {},
      donut_expand_duration: 50,
      donut_padAngle: 0,
      // spline
      spline_interpolation_type: 'cardinal',
      // stanford
      stanford_lines: [],
      stanford_regions: [],
      stanford_texts: [],
      stanford_scaleMin: undefined,
      stanford_scaleMax: undefined,
      stanford_scaleWidth: undefined,
      stanford_scaleFormat: undefined,
      stanford_scaleValues: undefined,
      stanford_colors: undefined,
      stanford_padding: {
        top: 0,
        right: 0,
        bottom: 0,
        left: 0
      },
      // region - region to change style
      regions: [],
      // tooltip - show when mouseover on each data
      tooltip_show: true,
      tooltip_grouped: true,
      tooltip_order: undefined,
      tooltip_format_title: undefined,
      tooltip_format_name: undefined,
      tooltip_format_value: undefined,
      tooltip_horizontal: undefined,
      tooltip_position: undefined,
      tooltip_contents: function tooltip_contents(d, defaultTitleFormat, defaultValueFormat, color) {
        return this.getTooltipContent ? this.getTooltipContent(d, defaultTitleFormat, defaultValueFormat, color) : '';
      },
      tooltip_init_show: false,
      tooltip_init_x: 0,
      tooltip_init_position: {
        top: '0px',
        left: '50px'
      },
      tooltip_onshow: function tooltip_onshow() {},
      tooltip_onhide: function tooltip_onhide() {},
      // title
      title_text: undefined,
      title_padding: {
        top: 0,
        right: 0,
        bottom: 0,
        left: 0
      },
      title_position: 'top-center'
    };
    Object.keys(this.additionalConfig).forEach(function (key) {
      config[key] = this.additionalConfig[key];
    }, this);
    return config;
  };

  ChartInternal.prototype.additionalConfig = {};

  ChartInternal.prototype.loadConfig = function (config) {
    var this_config = this.config,
        target,
        keys,
        read;

    function find() {
      var key = keys.shift(); //        console.log("key =>", key, ", target =>", target);

      if (key && target && _typeof(target) === 'object' && key in target) {
        target = target[key];
        return find();
      } else if (!key) {
        return target;
      } else {
        return undefined;
      }
    }

    Object.keys(this_config).forEach(function (key) {
      target = config;
      keys = key.split('_');
      read = find(); //        console.log("CONFIG : ", key, read);

      if (isDefined(read)) {
        this_config[key] = read;
      }
    });
  };

  ChartInternal.prototype.convertUrlToData = function (url, mimeType, headers, keys, done) {
    var $$ = this,
        type = mimeType ? mimeType : 'csv',
        f,
        converter;

    if (type === 'json') {
      f = $$.d3.json;
      converter = $$.convertJsonToData;
    } else if (type === 'tsv') {
      f = $$.d3.tsv;
      converter = $$.convertXsvToData;
    } else {
      f = $$.d3.csv;
      converter = $$.convertXsvToData;
    }

    f(url, headers).then(function (data) {
      done.call($$, converter.call($$, data, keys));
    })["catch"](function (error) {
      throw error;
    });
  };

  ChartInternal.prototype.convertXsvToData = function (xsv) {
    var keys = xsv.columns,
        rows = xsv;

    if (rows.length === 0) {
      return {
        keys: keys,
        rows: [keys.reduce(function (row, key) {
          return Object.assign(row, _defineProperty({}, key, null));
        }, {})]
      };
    } else {
      // [].concat() is to convert result into a plain array otherwise
      // test is not happy because rows have properties.
      return {
        keys: keys,
        rows: [].concat(xsv)
      };
    }
  };

  ChartInternal.prototype.convertJsonToData = function (json, keys) {
    var $$ = this,
        new_rows = [],
        targetKeys,
        data;

    if (keys) {
      // when keys specified, json would be an array that includes objects
      if (keys.x) {
        targetKeys = keys.value.concat(keys.x);
        $$.config.data_x = keys.x;
      } else {
        targetKeys = keys.value;
      }

      new_rows.push(targetKeys);
      json.forEach(function (o) {
        var new_row = [];
        targetKeys.forEach(function (key) {
          // convert undefined to null because undefined data will be removed in convertDataToTargets()
          var v = $$.findValueInJson(o, key);

          if (isUndefined(v)) {
            v = null;
          }

          new_row.push(v);
        });
        new_rows.push(new_row);
      });
      data = $$.convertRowsToData(new_rows);
    } else {
      Object.keys(json).forEach(function (key) {
        new_rows.push([key].concat(json[key]));
      });
      data = $$.convertColumnsToData(new_rows);
    }

    return data;
  };
  /**
   * Finds value from the given nested object by the given path.
   * If it's not found, then this returns undefined.
   * @param {Object} object the object
   * @param {string} path the path
   */


  ChartInternal.prototype.findValueInJson = function (object, path) {
    if (path in object) {
      // If object has a key that contains . or [], return the key's value
      // instead of searching for an inner object.
      // See https://github.com/c3js/c3/issues/1691 for details.
      return object[path];
    }

    path = path.replace(/\[(\w+)\]/g, '.$1'); // convert indexes to properties (replace [] with .)

    path = path.replace(/^\./, ''); // strip a leading dot

    var pathArray = path.split('.');

    for (var i = 0; i < pathArray.length; ++i) {
      var k = pathArray[i];

      if (k in object) {
        object = object[k];
      } else {
        return;
      }
    }

    return object;
  };
  /**
   * Converts the rows to normalized data.
   * @param {any[][]} rows The row data
   * @return {Object}
   */


  ChartInternal.prototype.convertRowsToData = function (rows) {
    var newRows = [];
    var keys = rows[0];

    for (var i = 1; i < rows.length; i++) {
      var newRow = {};

      for (var j = 0; j < rows[i].length; j++) {
        if (isUndefined(rows[i][j])) {
          throw new Error("Source data is missing a component at (" + i + "," + j + ")!");
        }

        newRow[keys[j]] = rows[i][j];
      }

      newRows.push(newRow);
    }

    return {
      keys: keys,
      rows: newRows
    };
  };
  /**
   * Converts the columns to normalized data.
   * @param {any[][]} columns The column data
   * @return {Object}
   */


  ChartInternal.prototype.convertColumnsToData = function (columns) {
    var newRows = [];
    var keys = [];

    for (var i = 0; i < columns.length; i++) {
      var key = columns[i][0];

      for (var j = 1; j < columns[i].length; j++) {
        if (isUndefined(newRows[j - 1])) {
          newRows[j - 1] = {};
        }

        if (isUndefined(columns[i][j])) {
          throw new Error("Source data is missing a component at (" + i + "," + j + ")!");
        }

        newRows[j - 1][key] = columns[i][j];
      }

      keys.push(key);
    }

    return {
      keys: keys,
      rows: newRows
    };
  };
  /**
   * Converts the data format into the target format.
   * @param {!Object} data
   * @param {!Array} data.keys Ordered list of target IDs.
   * @param {!Array} data.rows Rows of data to convert.
   * @param {boolean} appendXs True to append to $$.data.xs, False to replace.
   * @return {!Array}
   */


  ChartInternal.prototype.convertDataToTargets = function (data, appendXs) {
    var $$ = this,
        config = $$.config,
        targets,
        ids,
        xs,
        keys,
        epochs; // handles format where keys are not orderly provided

    if (isArray(data)) {
      keys = Object.keys(data[0]);
    } else {
      keys = data.keys;
      data = data.rows;
    }

    xs = keys.filter($$.isX, $$);

    if (!$$.isStanfordGraphType()) {
      ids = keys.filter($$.isNotX, $$);
    } else {
      epochs = keys.filter($$.isEpochs, $$);
      ids = keys.filter($$.isNotXAndNotEpochs, $$);

      if (xs.length !== 1 || epochs.length !== 1 || ids.length !== 1) {
        throw new Error('You must define the \'x\' key name and the \'epochs\' for Stanford Diagrams');
      }
    } // save x for update data by load when custom x and c3.x API


    ids.forEach(function (id) {
      var xKey = $$.getXKey(id);

      if ($$.isCustomX() || $$.isTimeSeries()) {
        // if included in input data
        if (xs.indexOf(xKey) >= 0) {
          $$.data.xs[id] = (appendXs && $$.data.xs[id] ? $$.data.xs[id] : []).concat(data.map(function (d) {
            return d[xKey];
          }).filter(isValue).map(function (rawX, i) {
            return $$.generateTargetX(rawX, id, i);
          }));
        } // if not included in input data, find from preloaded data of other id's x
        else if (config.data_x) {
            $$.data.xs[id] = $$.getOtherTargetXs();
          } // if not included in input data, find from preloaded data
          else if (notEmpty(config.data_xs)) {
              $$.data.xs[id] = $$.getXValuesOfXKey(xKey, $$.data.targets);
            } // MEMO: if no x included, use same x of current will be used

      } else {
        $$.data.xs[id] = data.map(function (d, i) {
          return i;
        });
      }
    }); // check x is defined

    ids.forEach(function (id) {
      if (!$$.data.xs[id]) {
        throw new Error('x is not defined for id = "' + id + '".');
      }
    }); // convert to target

    targets = ids.map(function (id, index) {
      var convertedId = config.data_idConverter(id);
      return {
        id: convertedId,
        id_org: id,
        values: data.map(function (d, i) {
          var xKey = $$.getXKey(id),
              rawX = d[xKey],
              value = d[id] !== null && !isNaN(d[id]) ? +d[id] : null,
              x,
              returnData; // use x as categories if custom x and categorized

          if ($$.isCustomX() && $$.isCategorized() && !isUndefined(rawX)) {
            if (index === 0 && i === 0) {
              config.axis_x_categories = [];
            }

            x = config.axis_x_categories.indexOf(rawX);

            if (x === -1) {
              x = config.axis_x_categories.length;
              config.axis_x_categories.push(rawX);
            }
          } else {
            x = $$.generateTargetX(rawX, id, i);
          } // mark as x = undefined if value is undefined and filter to remove after mapped


          if (isUndefined(d[id]) || $$.data.xs[id].length <= i) {
            x = undefined;
          }

          returnData = {
            x: x,
            value: value,
            id: convertedId
          };

          if ($$.isStanfordGraphType()) {
            returnData.epochs = d[epochs];
          }

          return returnData;
        }).filter(function (v) {
          return isDefined(v.x);
        })
      };
    }); // finish targets

    targets.forEach(function (t) {
      var i; // sort values by its x

      if (config.data_xSort) {
        t.values = t.values.sort(function (v1, v2) {
          var x1 = v1.x || v1.x === 0 ? v1.x : Infinity,
              x2 = v2.x || v2.x === 0 ? v2.x : Infinity;
          return x1 - x2;
        });
      } // indexing each value


      i = 0;
      t.values.forEach(function (v) {
        v.index = i++;
      }); // this needs to be sorted because its index and value.index is identical

      $$.data.xs[t.id].sort(function (v1, v2) {
        return v1 - v2;
      });
    }); // cache information about values

    $$.hasNegativeValue = $$.hasNegativeValueInTargets(targets);
    $$.hasPositiveValue = $$.hasPositiveValueInTargets(targets); // set target types

    if (config.data_type) {
      $$.setTargetType($$.mapToIds(targets).filter(function (id) {
        return !(id in config.data_types);
      }), config.data_type);
    } // cache as original id keyed


    targets.forEach(function (d) {
      $$.addCache(d.id_org, d);
    });
    return targets;
  };

  ChartInternal.prototype.isEpochs = function (key) {
    var $$ = this,
        config = $$.config;
    return config.data_epochs && key === config.data_epochs;
  };

  ChartInternal.prototype.isX = function (key) {
    var $$ = this,
        config = $$.config;
    return config.data_x && key === config.data_x || notEmpty(config.data_xs) && hasValue(config.data_xs, key);
  };

  ChartInternal.prototype.isNotX = function (key) {
    return !this.isX(key);
  };

  ChartInternal.prototype.isNotXAndNotEpochs = function (key) {
    return !this.isX(key) && !this.isEpochs(key);
  };
  /**
   * Returns whether the normalized stack option is enabled or not.
   *
   * To be enabled it must also have data.groups defined.
   *
   * @return {boolean}
   */


  ChartInternal.prototype.isStackNormalized = function () {
    return this.config.data_stack_normalize && this.config.data_groups.length > 0;
  };
  /**
   * Returns whether the axis is normalized or not.
   *
   * An axis is normalized as long as one of its associated target
   * is normalized.
   *
   * @param axisId Axis ID (y or y2)
   * @return {Boolean}
   */


  ChartInternal.prototype.isAxisNormalized = function (axisId) {
    var $$ = this;

    if (!$$.isStackNormalized()) {
      // shortcut
      return false;
    }

    return $$.data.targets.filter(function (target) {
      return $$.axis.getId(target.id) === axisId;
    }).some(function (target) {
      return $$.isTargetNormalized(target.id);
    });
  };
  /**
   * Returns whether the values for this target ID is normalized or not.
   *
   * To be normalized the option needs to be enabled and target needs
   * to be defined in `data.groups`.
   *
   * @param targetId ID of the target
   * @return {Boolean} True if the target is normalized, false otherwise.
   */


  ChartInternal.prototype.isTargetNormalized = function (targetId) {
    var $$ = this;
    return $$.isStackNormalized() && $$.config.data_groups.some(function (group) {
      return group.includes(targetId);
    });
  };

  ChartInternal.prototype.getXKey = function (id) {
    var $$ = this,
        config = $$.config;
    return config.data_x ? config.data_x : notEmpty(config.data_xs) ? config.data_xs[id] : null;
  };
  /**
   * Get sum of visible data per index for given axis.
   *
   * Expect axisId to be either 'y' or 'y2'.
   *
   * @private
   * @param axisId Compute sum for data associated to given axis.
   * @return {Array}
   */


  ChartInternal.prototype.getTotalPerIndex = function (axisId) {
    var $$ = this;

    if (!$$.isStackNormalized()) {
      return null;
    }

    var cached = $$.getFromCache('getTotalPerIndex');

    if (cached !== undefined) {
      return cached[axisId];
    }

    var sum = {
      y: [],
      y2: []
    };
    $$.data.targets // keep only target that are normalized
    .filter(function (target) {
      return $$.isTargetNormalized(target.id);
    }) // keep only target that are visible
    .filter(function (target) {
      return $$.isTargetToShow(target.id);
    }) // compute sum per axis
    .forEach(function (target) {
      var sumByAxis = sum[$$.axis.getId(target.id)];
      target.values.forEach(function (v, i) {
        if (!sumByAxis[i]) {
          sumByAxis[i] = 0;
        }

        sumByAxis[i] += isNumber(v.value) ? v.value : 0;
      });
    });
    $$.addToCache('getTotalPerIndex', sum);
    return sum[axisId];
  };
  /**
   * Get sum of visible data.
   *
   * Should be used for normalised data only since all values
   * are expected to be positive.
   *
   * @private
   * @return {Number}
   */


  ChartInternal.prototype.getTotalDataSum = function () {
    var $$ = this;
    var cached = $$.getFromCache('getTotalDataSum');

    if (cached !== undefined) {
      return cached;
    }

    var totalDataSum = flattenArray($$.data.targets.filter(function (target) {
      return $$.isTargetToShow(target.id);
    }).map(function (target) {
      return target.values;
    })).map(function (d) {
      return d.value;
    }).reduce(function (p, c) {
      return p + c;
    }, 0);
    $$.addToCache('getTotalDataSum', totalDataSum);
    return totalDataSum;
  };

  ChartInternal.prototype.getXValuesOfXKey = function (key, targets) {
    var $$ = this,
        xValues,
        ids = targets && notEmpty(targets) ? $$.mapToIds(targets) : [];
    ids.forEach(function (id) {
      if ($$.getXKey(id) === key) {
        xValues = $$.data.xs[id];
      }
    });
    return xValues;
  };

  ChartInternal.prototype.getXValue = function (id, i) {
    var $$ = this;
    return id in $$.data.xs && $$.data.xs[id] && isValue($$.data.xs[id][i]) ? $$.data.xs[id][i] : i;
  };

  ChartInternal.prototype.getOtherTargetXs = function () {
    var $$ = this,
        idsForX = Object.keys($$.data.xs);
    return idsForX.length ? $$.data.xs[idsForX[0]] : null;
  };

  ChartInternal.prototype.getOtherTargetX = function (index) {
    var xs = this.getOtherTargetXs();
    return xs && index < xs.length ? xs[index] : null;
  };

  ChartInternal.prototype.addXs = function (xs) {
    var $$ = this;
    Object.keys(xs).forEach(function (id) {
      $$.config.data_xs[id] = xs[id];
    });
  };

  ChartInternal.prototype.addName = function (data) {
    var $$ = this,
        name;

    if (data) {
      name = $$.config.data_names[data.id];
      data.name = name !== undefined ? name : data.id;
    }

    return data;
  };

  ChartInternal.prototype.getValueOnIndex = function (values, index) {
    var valueOnIndex = values.filter(function (v) {
      return v.index === index;
    });
    return valueOnIndex.length ? valueOnIndex[0] : null;
  };

  ChartInternal.prototype.updateTargetX = function (targets, x) {
    var $$ = this;
    targets.forEach(function (t) {
      t.values.forEach(function (v, i) {
        v.x = $$.generateTargetX(x[i], t.id, i);
      });
      $$.data.xs[t.id] = x;
    });
  };

  ChartInternal.prototype.updateTargetXs = function (targets, xs) {
    var $$ = this;
    targets.forEach(function (t) {
      if (xs[t.id]) {
        $$.updateTargetX([t], xs[t.id]);
      }
    });
  };

  ChartInternal.prototype.generateTargetX = function (rawX, id, index) {
    var $$ = this,
        x;

    if ($$.isTimeSeries()) {
      x = rawX ? $$.parseDate(rawX) : $$.parseDate($$.getXValue(id, index));
    } else if ($$.isCustomX() && !$$.isCategorized()) {
      x = isValue(rawX) ? +rawX : $$.getXValue(id, index);
    } else {
      x = index;
    }

    return x;
  };

  ChartInternal.prototype.cloneTarget = function (target) {
    return {
      id: target.id,
      id_org: target.id_org,
      values: target.values.map(function (d) {
        return {
          x: d.x,
          value: d.value,
          id: d.id
        };
      })
    };
  };

  ChartInternal.prototype.getMaxDataCount = function () {
    var $$ = this;
    return $$.d3.max($$.data.targets, function (t) {
      return t.values.length;
    });
  };

  ChartInternal.prototype.mapToIds = function (targets) {
    return targets.map(function (d) {
      return d.id;
    });
  };

  ChartInternal.prototype.mapToTargetIds = function (ids) {
    var $$ = this;
    return ids ? [].concat(ids) : $$.mapToIds($$.data.targets);
  };

  ChartInternal.prototype.hasTarget = function (targets, id) {
    var ids = this.mapToIds(targets),
        i;

    for (i = 0; i < ids.length; i++) {
      if (ids[i] === id) {
        return true;
      }
    }

    return false;
  };

  ChartInternal.prototype.isTargetToShow = function (targetId) {
    return this.hiddenTargetIds.indexOf(targetId) < 0;
  };

  ChartInternal.prototype.isLegendToShow = function (targetId) {
    return this.hiddenLegendIds.indexOf(targetId) < 0;
  };
  /**
   * Returns only visible targets.
   *
   * This is the same as calling {@link filterTargetsToShow} on $$.data.targets.
   *
   * @return {Array}
   */


  ChartInternal.prototype.getTargetsToShow = function () {
    var $$ = this;
    return $$.filterTargetsToShow($$.data.targets);
  };

  ChartInternal.prototype.filterTargetsToShow = function (targets) {
    var $$ = this;
    return targets.filter(function (t) {
      return $$.isTargetToShow(t.id);
    });
  };
  /**
   * @return {Array} Returns all the targets attached to the chart, visible or not
   */


  ChartInternal.prototype.getTargets = function () {
    var $$ = this;
    return $$.data.targets;
  };

  ChartInternal.prototype.mapTargetsToUniqueXs = function (targets) {
    var $$ = this;
    var xs = $$.d3.set($$.d3.merge(targets.map(function (t) {
      return t.values.map(function (v) {
        return +v.x;
      });
    }))).values();
    xs = $$.isTimeSeries() ? xs.map(function (x) {
      return new Date(+x);
    }) : xs.map(function (x) {
      return +x;
    });
    return xs.sort(function (a, b) {
      return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
    });
  };

  ChartInternal.prototype.addHiddenTargetIds = function (targetIds) {
    targetIds = targetIds instanceof Array ? targetIds : new Array(targetIds);

    for (var i = 0; i < targetIds.length; i++) {
      if (this.hiddenTargetIds.indexOf(targetIds[i]) < 0) {
        this.hiddenTargetIds = this.hiddenTargetIds.concat(targetIds[i]);
      }
    }

    this.resetCache();
  };

  ChartInternal.prototype.removeHiddenTargetIds = function (targetIds) {
    this.hiddenTargetIds = this.hiddenTargetIds.filter(function (id) {
      return targetIds.indexOf(id) < 0;
    });
    this.resetCache();
  };

  ChartInternal.prototype.addHiddenLegendIds = function (targetIds) {
    targetIds = targetIds instanceof Array ? targetIds : new Array(targetIds);

    for (var i = 0; i < targetIds.length; i++) {
      if (this.hiddenLegendIds.indexOf(targetIds[i]) < 0) {
        this.hiddenLegendIds = this.hiddenLegendIds.concat(targetIds[i]);
      }
    }
  };

  ChartInternal.prototype.removeHiddenLegendIds = function (targetIds) {
    this.hiddenLegendIds = this.hiddenLegendIds.filter(function (id) {
      return targetIds.indexOf(id) < 0;
    });
  };

  ChartInternal.prototype.getValuesAsIdKeyed = function (targets) {
    var ys = {};
    targets.forEach(function (t) {
      ys[t.id] = [];
      t.values.forEach(function (v) {
        ys[t.id].push(v.value);
      });
    });
    return ys;
  };

  ChartInternal.prototype.checkValueInTargets = function (targets, checker) {
    var ids = Object.keys(targets),
        i,
        j,
        values;

    for (i = 0; i < ids.length; i++) {
      values = targets[ids[i]].values;

      for (j = 0; j < values.length; j++) {
        if (checker(values[j].value)) {
          return true;
        }
      }
    }

    return false;
  };

  ChartInternal.prototype.hasNegativeValueInTargets = function (targets) {
    return this.checkValueInTargets(targets, function (v) {
      return v < 0;
    });
  };

  ChartInternal.prototype.hasPositiveValueInTargets = function (targets) {
    return this.checkValueInTargets(targets, function (v) {
      return v > 0;
    });
  };

  ChartInternal.prototype.isOrderDesc = function () {
    var config = this.config;
    return typeof config.data_order === 'string' && config.data_order.toLowerCase() === 'desc';
  };

  ChartInternal.prototype.isOrderAsc = function () {
    var config = this.config;
    return typeof config.data_order === 'string' && config.data_order.toLowerCase() === 'asc';
  };

  ChartInternal.prototype.getOrderFunction = function () {
    var $$ = this,
        config = $$.config,
        orderAsc = $$.isOrderAsc(),
        orderDesc = $$.isOrderDesc();

    if (orderAsc || orderDesc) {
      var reducer = function reducer(p, c) {
        return p + Math.abs(c.value);
      };

      return function (t1, t2) {
        var t1Sum = t1.values.reduce(reducer, 0),
            t2Sum = t2.values.reduce(reducer, 0);
        return orderAsc ? t2Sum - t1Sum : t1Sum - t2Sum;
      };
    } else if (isFunction(config.data_order)) {
      return config.data_order;
    } else if (isArray(config.data_order)) {
      var order = config.data_order;
      return function (t1, t2) {
        return order.indexOf(t1.id) - order.indexOf(t2.id);
      };
    }
  };

  ChartInternal.prototype.orderTargets = function (targets) {
    var fct = this.getOrderFunction();

    if (fct) {
      targets.sort(fct);
    }

    return targets;
  };
  /**
   * Returns all the values from the given targets at the given index.
   *
   * @param {Array} targets
   * @param {Number} index
   * @return {Array}
   */


  ChartInternal.prototype.filterByIndex = function (targets, index) {
    return this.d3.merge(targets.map(function (t) {
      return t.values.filter(function (v) {
        return v.index === index;
      });
    }));
  };

  ChartInternal.prototype.filterByX = function (targets, x) {
    return this.d3.merge(targets.map(function (t) {
      return t.values;
    })).filter(function (v) {
      return v.x - x === 0;
    });
  };

  ChartInternal.prototype.filterRemoveNull = function (data) {
    return data.filter(function (d) {
      return isValue(d.value);
    });
  };

  ChartInternal.prototype.filterByXDomain = function (targets, xDomain) {
    return targets.map(function (t) {
      return {
        id: t.id,
        id_org: t.id_org,
        values: t.values.filter(function (v) {
          return xDomain[0] <= v.x && v.x <= xDomain[1];
        })
      };
    });
  };

  ChartInternal.prototype.hasDataLabel = function () {
    var config = this.config;

    if (typeof config.data_labels === 'boolean' && config.data_labels) {
      return true;
    } else if (_typeof(config.data_labels) === 'object' && notEmpty(config.data_labels)) {
      return true;
    }

    return false;
  };

  ChartInternal.prototype.getDataLabelLength = function (min, max, key) {
    var $$ = this,
        lengths = [0, 0],
        paddingCoef = 1.3;
    $$.selectChart.select('svg').selectAll('.dummy').data([min, max]).enter().append('text').text(function (d) {
      return $$.dataLabelFormat(d.id)(d);
    }).each(function (d, i) {
      lengths[i] = getBBox(this)[key] * paddingCoef;
    }).remove();
    return lengths;
  };
  /**
   * Returns true if the given data point is not arc type, otherwise false.
   * @param {Object} d The data point
   * @return {boolean}
   */


  ChartInternal.prototype.isNoneArc = function (d) {
    return this.hasTarget(this.data.targets, d.id);
  };
  /**
   * Returns true if the given data point is arc type, otherwise false.
   * @param {Object} d The data point
   * @return {boolean}
   */


  ChartInternal.prototype.isArc = function (d) {
    return 'data' in d && this.hasTarget(this.data.targets, d.data.id);
  };
  /**
   * Find the closest point from the given pos among the given targets or
   * undefined if none satisfies conditions.
   *
   * @param {Array} targets
   * @param {Array} pos An [x,y] coordinate
   * @return {Object|undefined}
   */


  ChartInternal.prototype.findClosestFromTargets = function (targets, pos) {
    var $$ = this; // for each target, find the closest point

    var candidates = targets.map(function (t) {
      return $$.findClosest(t.values, pos, $$.config.tooltip_horizontal ? $$.horizontalDistance.bind($$) : $$.dist.bind($$), $$.config.point_sensitivity);
    }).filter(function (v) {
      return v;
    }); // returns the closest of candidates

    if (candidates.length === 0) {
      return undefined;
    } else if (candidates.length === 1) {
      return candidates[0];
    } else {
      return $$.findClosest(candidates, pos, $$.dist.bind($$));
    }
  };
  /**
   * Find the closest point from the x value or undefined if none satisfies conditions.
   *
   * @param {Array} targets
   * @param {Array} x A value on X axis
   * @return {Object|undefined}
   */


  ChartInternal.prototype.findClosestFromTargetsByX = function (targets, x) {
    var closest;
    var diff;
    targets.forEach(function (t) {
      t.values.forEach(function (d) {
        var newDiff = Math.abs(x - d.x);

        if (diff === undefined || newDiff < diff) {
          closest = d;
          diff = newDiff;
        }
      });
    });
    return closest;
  };
  /**
   * Using given compute distance method, returns the closest data point from the
   * given position.
   *
   * Giving optionally a minimum distance to satisfy.
   *
   * @param {Array} dataPoints List of DataPoints
   * @param {Array} pos An [x,y] coordinate
   * @param {Function} computeDist Function to compute distance between 2 points
   * @param {Number} minDist Minimal distance to satisfy
   * @return {Object|undefined} Closest data point
   */


  ChartInternal.prototype.findClosest = function (dataPoints, pos, computeDist) {
    var minDist = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : Infinity;
    var $$ = this;
    var closest; // find closest bar

    dataPoints.filter(function (v) {
      return v && $$.isBarType(v.id);
    }).forEach(function (v) {
      if (!closest) {
        var shape = $$.main.select('.' + CLASS.bars + $$.getTargetSelectorSuffix(v.id) + ' .' + CLASS.bar + '-' + v.index).node();

        if ($$.isWithinBar(pos, shape)) {
          closest = v;
        }
      }
    }); // find closest point from non-bar

    dataPoints.filter(function (v) {
      return v && !$$.isBarType(v.id);
    }).forEach(function (v) {
      var d = computeDist(v, pos);

      if (d < minDist) {
        minDist = d;
        closest = v;
      }
    });
    return closest;
  };

  ChartInternal.prototype.dist = function (data, pos) {
    var $$ = this,
        config = $$.config,
        xIndex = config.axis_rotated ? 1 : 0,
        yIndex = config.axis_rotated ? 0 : 1,
        y = $$.circleY(data, data.index),
        x = $$.x(data.x);
    return Math.sqrt(Math.pow(x - pos[xIndex], 2) + Math.pow(y - pos[yIndex], 2));
  };

  ChartInternal.prototype.horizontalDistance = function (data, pos) {
    var $$ = this,
        config = $$.config,
        xIndex = config.axis_rotated ? 1 : 0,
        x = $$.x(data.x);
    return Math.abs(x - pos[xIndex]);
  };

  ChartInternal.prototype.convertValuesToStep = function (values) {
    var converted = [].concat(values),
        i;

    if (!this.isCategorized()) {
      return values;
    }

    for (i = values.length + 1; 0 < i; i--) {
      converted[i] = converted[i - 1];
    }

    converted[0] = {
      x: converted[0].x - 1,
      value: converted[0].value,
      id: converted[0].id
    };
    converted[values.length + 1] = {
      x: converted[values.length].x + 1,
      value: converted[values.length].value,
      id: converted[values.length].id
    };
    return converted;
  };
  /**
   * Get ratio value
   *
   * @param {String} type Ratio for given type
   * @param {Object} d Data value object
   * @param {Boolean} asPercent Convert the return as percent or not
   * @return {Number} Ratio value
   * @private
   */


  ChartInternal.prototype.getRatio = function (type, d) {
    var asPercent = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
    var $$ = this;
    var api = $$.api;
    var ratio = 0;

    if (d && api.data.shown.call(api).length) {
      ratio = d.ratio || d.value;

      if (type === "arc") {
        if ($$.hasType('gauge')) {
          ratio = (d.endAngle - d.startAngle) / (Math.PI * ($$.config.gauge_fullCircle ? 2 : 1));
        } else {
          var total = $$.getTotalDataSum();
          ratio = d.value / total;
        }
      } else if (type === "index") {
        var _total = $$.getTotalPerIndex($$.axis.getId(d.id));

        d.ratio = isNumber(d.value) && _total && _total[d.index] > 0 ? d.value / _total[d.index] : 0;
        ratio = d.ratio;
      }
    }

    return asPercent && ratio ? ratio * 100 : ratio;
  };

  ChartInternal.prototype.updateDataAttributes = function (name, attrs) {
    var $$ = this,
        config = $$.config,
        current = config['data_' + name];

    if (typeof attrs === 'undefined') {
      return current;
    }

    Object.keys(attrs).forEach(function (id) {
      current[id] = attrs[id];
    });
    $$.redraw({
      withLegend: true
    });
    return current;
  };

  ChartInternal.prototype.load = function (targets, args) {
    var $$ = this;

    if (targets) {
      // filter loading targets if needed
      if (args.filter) {
        targets = targets.filter(args.filter);
      } // set type if args.types || args.type specified


      if (args.type || args.types) {
        targets.forEach(function (t) {
          var type = args.types && args.types[t.id] ? args.types[t.id] : args.type;
          $$.setTargetType(t.id, type);
        });
      } // Update/Add data


      $$.data.targets.forEach(function (d) {
        for (var i = 0; i < targets.length; i++) {
          if (d.id === targets[i].id) {
            d.values = targets[i].values;
            targets.splice(i, 1);
            break;
          }
        }
      });
      $$.data.targets = $$.data.targets.concat(targets); // add remained
    } // Set targets


    $$.updateTargets($$.data.targets); // Redraw with new targets

    $$.redraw({
      withUpdateOrgXDomain: true,
      withUpdateXDomain: true,
      withLegend: true
    });

    if (args.done) {
      args.done();
    }
  };

  ChartInternal.prototype.loadFromArgs = function (args) {
    var $$ = this;
    $$.resetCache();

    if (args.data) {
      $$.load($$.convertDataToTargets(args.data), args);
    } else if (args.url) {
      $$.convertUrlToData(args.url, args.mimeType, args.headers, args.keys, function (data) {
        $$.load($$.convertDataToTargets(data), args);
      });
    } else if (args.json) {
      $$.load($$.convertDataToTargets($$.convertJsonToData(args.json, args.keys)), args);
    } else if (args.rows) {
      $$.load($$.convertDataToTargets($$.convertRowsToData(args.rows)), args);
    } else if (args.columns) {
      $$.load($$.convertDataToTargets($$.convertColumnsToData(args.columns)), args);
    } else {
      $$.load(null, args);
    }
  };

  ChartInternal.prototype.unload = function (targetIds, done) {
    var $$ = this;
    $$.resetCache();

    if (!done) {
      done = function done() {};
    } // filter existing target


    targetIds = targetIds.filter(function (id) {
      return $$.hasTarget($$.data.targets, id);
    }); // If no target, call done and return

    if (!targetIds || targetIds.length === 0) {
      done();
      return;
    }

    $$.svg.selectAll(targetIds.map(function (id) {
      return $$.selectorTarget(id);
    })).transition().style('opacity', 0).remove().call($$.endall, done);
    targetIds.forEach(function (id) {
      // Reset fadein for future load
      $$.withoutFadeIn[id] = false; // Remove target's elements

      if ($$.legend) {
        $$.legend.selectAll('.' + CLASS.legendItem + $$.getTargetSelectorSuffix(id)).remove();
      } // Remove target


      $$.data.targets = $$.data.targets.filter(function (t) {
        return t.id !== id;
      });
    });
  };

  ChartInternal.prototype.getYDomainMin = function (targets) {
    var $$ = this,
        config = $$.config,
        ids = $$.mapToIds(targets),
        ys = $$.getValuesAsIdKeyed(targets),
        j,
        k,
        baseId,
        idsInGroup,
        id,
        hasNegativeValue;

    if (config.data_groups.length > 0) {
      hasNegativeValue = $$.hasNegativeValueInTargets(targets);

      for (j = 0; j < config.data_groups.length; j++) {
        // Determine baseId
        idsInGroup = config.data_groups[j].filter(function (id) {
          return ids.indexOf(id) >= 0;
        });

        if (idsInGroup.length === 0) {
          continue;
        }

        baseId = idsInGroup[0]; // Consider negative values

        if (hasNegativeValue && ys[baseId]) {
          ys[baseId].forEach(function (v, i) {
            ys[baseId][i] = v < 0 ? v : 0;
          });
        } // Compute min


        for (k = 1; k < idsInGroup.length; k++) {
          id = idsInGroup[k];

          if (!ys[id]) {
            continue;
          }

          ys[id].forEach(function (v, i) {
            if ($$.axis.getId(id) === $$.axis.getId(baseId) && ys[baseId] && !(hasNegativeValue && +v > 0)) {
              ys[baseId][i] += +v;
            }
          });
        }
      }
    }

    return $$.d3.min(Object.keys(ys).map(function (key) {
      return $$.d3.min(ys[key]);
    }));
  };

  ChartInternal.prototype.getYDomainMax = function (targets) {
    var $$ = this,
        config = $$.config,
        ids = $$.mapToIds(targets),
        ys = $$.getValuesAsIdKeyed(targets),
        j,
        k,
        baseId,
        idsInGroup,
        id,
        hasPositiveValue;

    if (config.data_groups.length > 0) {
      hasPositiveValue = $$.hasPositiveValueInTargets(targets);

      for (j = 0; j < config.data_groups.length; j++) {
        // Determine baseId
        idsInGroup = config.data_groups[j].filter(function (id) {
          return ids.indexOf(id) >= 0;
        });

        if (idsInGroup.length === 0) {
          continue;
        }

        baseId = idsInGroup[0]; // Consider positive values

        if (hasPositiveValue && ys[baseId]) {
          ys[baseId].forEach(function (v, i) {
            ys[baseId][i] = v > 0 ? v : 0;
          });
        } // Compute max


        for (k = 1; k < idsInGroup.length; k++) {
          id = idsInGroup[k];

          if (!ys[id]) {
            continue;
          }

          ys[id].forEach(function (v, i) {
            if ($$.axis.getId(id) === $$.axis.getId(baseId) && ys[baseId] && !(hasPositiveValue && +v < 0)) {
              ys[baseId][i] += +v;
            }
          });
        }
      }
    }

    return $$.d3.max(Object.keys(ys).map(function (key) {
      return $$.d3.max(ys[key]);
    }));
  };

  ChartInternal.prototype.getYDomain = function (targets, axisId, xDomain) {
    var $$ = this,
        config = $$.config;

    if ($$.isAxisNormalized(axisId)) {
      return [0, 100];
    }

    var targetsByAxisId = targets.filter(function (t) {
      return $$.axis.getId(t.id) === axisId;
    }),
        yTargets = xDomain ? $$.filterByXDomain(targetsByAxisId, xDomain) : targetsByAxisId,
        yMin = axisId === 'y2' ? config.axis_y2_min : config.axis_y_min,
        yMax = axisId === 'y2' ? config.axis_y2_max : config.axis_y_max,
        yDomainMin = $$.getYDomainMin(yTargets),
        yDomainMax = $$.getYDomainMax(yTargets),
        domain,
        domainLength,
        padding_top,
        padding_bottom,
        center = axisId === 'y2' ? config.axis_y2_center : config.axis_y_center,
        yDomainAbs,
        lengths,
        diff,
        ratio,
        isAllPositive,
        isAllNegative,
        isZeroBased = $$.hasType('bar', yTargets) && config.bar_zerobased || $$.hasType('area', yTargets) && config.area_zerobased,
        isInverted = axisId === 'y2' ? config.axis_y2_inverted : config.axis_y_inverted,
        showHorizontalDataLabel = $$.hasDataLabel() && config.axis_rotated,
        showVerticalDataLabel = $$.hasDataLabel() && !config.axis_rotated; // MEMO: avoid inverting domain unexpectedly

    yDomainMin = isValue(yMin) ? yMin : isValue(yMax) ? yDomainMin < yMax ? yDomainMin : yMax - 10 : yDomainMin;
    yDomainMax = isValue(yMax) ? yMax : isValue(yMin) ? yMin < yDomainMax ? yDomainMax : yMin + 10 : yDomainMax;

    if (yTargets.length === 0) {
      // use current domain if target of axisId is none
      return axisId === 'y2' ? $$.y2.domain() : $$.y.domain();
    }

    if (isNaN(yDomainMin)) {
      // set minimum to zero when not number
      yDomainMin = 0;
    }

    if (isNaN(yDomainMax)) {
      // set maximum to have same value as yDomainMin
      yDomainMax = yDomainMin;
    }

    if (yDomainMin === yDomainMax) {
      yDomainMin < 0 ? yDomainMax = 0 : yDomainMin = 0;
    }

    isAllPositive = yDomainMin >= 0 && yDomainMax >= 0;
    isAllNegative = yDomainMin <= 0 && yDomainMax <= 0; // Cancel zerobased if axis_*_min / axis_*_max specified

    if (isValue(yMin) && isAllPositive || isValue(yMax) && isAllNegative) {
      isZeroBased = false;
    } // Bar/Area chart should be 0-based if all positive|negative


    if (isZeroBased) {
      if (isAllPositive) {
        yDomainMin = 0;
      }

      if (isAllNegative) {
        yDomainMax = 0;
      }
    }

    domainLength = Math.abs(yDomainMax - yDomainMin);
    padding_top = padding_bottom = domainLength * 0.1;

    if (typeof center !== 'undefined') {
      yDomainAbs = Math.max(Math.abs(yDomainMin), Math.abs(yDomainMax));
      yDomainMax = center + yDomainAbs;
      yDomainMin = center - yDomainAbs;
    } // add padding for data label


    if (showHorizontalDataLabel) {
      lengths = $$.getDataLabelLength(yDomainMin, yDomainMax, 'width');
      diff = diffDomain($$.y.range());
      ratio = [lengths[0] / diff, lengths[1] / diff];
      padding_top += domainLength * (ratio[1] / (1 - ratio[0] - ratio[1]));
      padding_bottom += domainLength * (ratio[0] / (1 - ratio[0] - ratio[1]));
    } else if (showVerticalDataLabel) {
      lengths = $$.getDataLabelLength(yDomainMin, yDomainMax, 'height');
      var pixelsToAxisPadding = $$.getY(config["axis_".concat(axisId, "_type")], // input domain as pixels
      [0, config.axis_rotated ? $$.width : $$.height], // output range as axis padding
      [0, domainLength]);
      padding_top += pixelsToAxisPadding(lengths[1]);
      padding_bottom += pixelsToAxisPadding(lengths[0]);
    }

    if (axisId === 'y' && notEmpty(config.axis_y_padding)) {
      padding_top = $$.axis.getPadding(config.axis_y_padding, 'top', padding_top, domainLength);
      padding_bottom = $$.axis.getPadding(config.axis_y_padding, 'bottom', padding_bottom, domainLength);
    }

    if (axisId === 'y2' && notEmpty(config.axis_y2_padding)) {
      padding_top = $$.axis.getPadding(config.axis_y2_padding, 'top', padding_top, domainLength);
      padding_bottom = $$.axis.getPadding(config.axis_y2_padding, 'bottom', padding_bottom, domainLength);
    } // Bar/Area chart should be 0-based if all positive|negative


    if (isZeroBased) {
      if (isAllPositive) {
        padding_bottom = yDomainMin;
      }

      if (isAllNegative) {
        padding_top = -yDomainMax;
      }
    }

    domain = [yDomainMin - padding_bottom, yDomainMax + padding_top];
    return isInverted ? domain.reverse() : domain;
  };

  ChartInternal.prototype.getXDomainMin = function (targets) {
    var $$ = this,
        config = $$.config;
    return isDefined(config.axis_x_min) ? $$.isTimeSeries() ? this.parseDate(config.axis_x_min) : config.axis_x_min : $$.d3.min(targets, function (t) {
      return $$.d3.min(t.values, function (v) {
        return v.x;
      });
    });
  };

  ChartInternal.prototype.getXDomainMax = function (targets) {
    var $$ = this,
        config = $$.config;
    return isDefined(config.axis_x_max) ? $$.isTimeSeries() ? this.parseDate(config.axis_x_max) : config.axis_x_max : $$.d3.max(targets, function (t) {
      return $$.d3.max(t.values, function (v) {
        return v.x;
      });
    });
  };

  ChartInternal.prototype.getXDomainPadding = function (domain) {
    var $$ = this,
        config = $$.config,
        diff = domain[1] - domain[0],
        maxDataCount,
        padding,
        paddingLeft,
        paddingRight;

    if ($$.isCategorized()) {
      padding = 0;
    } else if ($$.hasType('bar')) {
      maxDataCount = $$.getMaxDataCount();
      padding = maxDataCount > 1 ? diff / (maxDataCount - 1) / 2 : 0.5;
    } else {
      padding = diff * 0.01;
    }

    if (_typeof(config.axis_x_padding) === 'object' && notEmpty(config.axis_x_padding)) {
      paddingLeft = isValue(config.axis_x_padding.left) ? config.axis_x_padding.left : padding;
      paddingRight = isValue(config.axis_x_padding.right) ? config.axis_x_padding.right : padding;
    } else if (typeof config.axis_x_padding === 'number') {
      paddingLeft = paddingRight = config.axis_x_padding;
    } else {
      paddingLeft = paddingRight = padding;
    }

    return {
      left: paddingLeft,
      right: paddingRight
    };
  };

  ChartInternal.prototype.getXDomain = function (targets) {
    var $$ = this,
        xDomain = [$$.getXDomainMin(targets), $$.getXDomainMax(targets)],
        firstX = xDomain[0],
        lastX = xDomain[1],
        padding = $$.getXDomainPadding(xDomain),
        min = 0,
        max = 0; // show center of x domain if min and max are the same

    if (firstX - lastX === 0 && !$$.isCategorized()) {
      if ($$.isTimeSeries()) {
        firstX = new Date(firstX.getTime() * 0.5);
        lastX = new Date(lastX.getTime() * 1.5);
      } else {
        firstX = firstX === 0 ? 1 : firstX * 0.5;
        lastX = lastX === 0 ? -1 : lastX * 1.5;
      }
    }

    if (firstX || firstX === 0) {
      min = $$.isTimeSeries() ? new Date(firstX.getTime() - padding.left) : firstX - padding.left;
    }

    if (lastX || lastX === 0) {
      max = $$.isTimeSeries() ? new Date(lastX.getTime() + padding.right) : lastX + padding.right;
    }

    return [min, max];
  };

  ChartInternal.prototype.updateXDomain = function (targets, withUpdateXDomain, withUpdateOrgXDomain, withTrim, domain) {
    var $$ = this,
        config = $$.config;

    if (withUpdateOrgXDomain) {
      $$.x.domain(domain ? domain : $$.d3.extent($$.getXDomain(targets)));
      $$.orgXDomain = $$.x.domain();

      if (config.zoom_enabled) {
        $$.zoom.update();
      }

      $$.subX.domain($$.x.domain());

      if ($$.brush) {
        $$.brush.updateScale($$.subX);
      }
    }

    if (withUpdateXDomain) {
      $$.x.domain(domain ? domain : !$$.brush || $$.brush.empty() ? $$.orgXDomain : $$.brush.selectionAsValue());
    } // Trim domain when too big by zoom mousemove event


    if (withTrim) {
      $$.x.domain($$.trimXDomain($$.x.orgDomain()));
    }

    return $$.x.domain();
  };

  ChartInternal.prototype.trimXDomain = function (domain) {
    var zoomDomain = this.getZoomDomain(),
        min = zoomDomain[0],
        max = zoomDomain[1];

    if (domain[0] <= min) {
      domain[1] = +domain[1] + (min - domain[0]);
      domain[0] = min;
    }

    if (max <= domain[1]) {
      domain[0] = +domain[0] - (domain[1] - max);
      domain[1] = max;
    }

    return domain;
  };

  ChartInternal.prototype.drag = function (mouse) {
    var $$ = this,
        config = $$.config,
        main = $$.main,
        d3 = $$.d3;
    var sx, sy, mx, my, minX, maxX, minY, maxY;

    if ($$.hasArcType()) {
      return;
    }

    if (!config.data_selection_enabled) {
      return;
    } // do nothing if not selectable


    if (!config.data_selection_multiple) {
      return;
    } // skip when single selection because drag is used for multiple selection


    sx = $$.dragStart[0];
    sy = $$.dragStart[1];
    mx = mouse[0];
    my = mouse[1];
    minX = Math.min(sx, mx);
    maxX = Math.max(sx, mx);
    minY = config.data_selection_grouped ? $$.margin.top : Math.min(sy, my);
    maxY = config.data_selection_grouped ? $$.height : Math.max(sy, my);
    main.select('.' + CLASS.dragarea).attr('x', minX).attr('y', minY).attr('width', maxX - minX).attr('height', maxY - minY); // TODO: binary search when multiple xs

    main.selectAll('.' + CLASS.shapes).selectAll('.' + CLASS.shape).filter(function (d) {
      return config.data_selection_isselectable(d);
    }).each(function (d, i) {
      var shape = d3.select(this),
          isSelected = shape.classed(CLASS.SELECTED),
          isIncluded = shape.classed(CLASS.INCLUDED),
          _x,
          _y,
          _w,
          _h,
          toggle,
          isWithin = false,
          box;

      if (shape.classed(CLASS.circle)) {
        _x = shape.attr("cx") * 1;
        _y = shape.attr("cy") * 1;
        toggle = $$.togglePoint;
        isWithin = minX < _x && _x < maxX && minY < _y && _y < maxY;
      } else if (shape.classed(CLASS.bar)) {
        box = getPathBox(this);
        _x = box.x;
        _y = box.y;
        _w = box.width;
        _h = box.height;
        toggle = $$.togglePath;
        isWithin = !(maxX < _x || _x + _w < minX) && !(maxY < _y || _y + _h < minY);
      } else {
        // line/area selection not supported yet
        return;
      }

      if (isWithin ^ isIncluded) {
        shape.classed(CLASS.INCLUDED, !isIncluded); // TODO: included/unincluded callback here

        shape.classed(CLASS.SELECTED, !isSelected);
        toggle.call($$, !isSelected, shape, d, i);
      }
    });
  };

  ChartInternal.prototype.dragstart = function (mouse) {
    var $$ = this,
        config = $$.config;

    if ($$.hasArcType()) {
      return;
    }

    if (!config.data_selection_enabled) {
      return;
    } // do nothing if not selectable


    $$.dragStart = mouse;
    $$.main.select('.' + CLASS.chart).append('rect').attr('class', CLASS.dragarea).style('opacity', 0.1);
    $$.dragging = true;
  };

  ChartInternal.prototype.dragend = function () {
    var $$ = this,
        config = $$.config;

    if ($$.hasArcType()) {
      return;
    }

    if (!config.data_selection_enabled) {
      return;
    } // do nothing if not selectable


    $$.main.select('.' + CLASS.dragarea).transition().duration(100).style('opacity', 0).remove();
    $$.main.selectAll('.' + CLASS.shape).classed(CLASS.INCLUDED, false);
    $$.dragging = false;
  };

  ChartInternal.prototype.getYFormat = function (forArc) {
    var $$ = this,
        formatForY = forArc && !$$.hasType('gauge') ? $$.defaultArcValueFormat : $$.yFormat,
        formatForY2 = forArc && !$$.hasType('gauge') ? $$.defaultArcValueFormat : $$.y2Format;
    return function (v, ratio, id) {
      var format = $$.axis.getId(id) === 'y2' ? formatForY2 : formatForY;
      return format.call($$, v, ratio);
    };
  };

  ChartInternal.prototype.yFormat = function (v) {
    var $$ = this,
        config = $$.config,
        format = config.axis_y_tick_format ? config.axis_y_tick_format : $$.defaultValueFormat;
    return format(v);
  };

  ChartInternal.prototype.y2Format = function (v) {
    var $$ = this,
        config = $$.config,
        format = config.axis_y2_tick_format ? config.axis_y2_tick_format : $$.defaultValueFormat;
    return format(v);
  };

  ChartInternal.prototype.defaultValueFormat = function (v) {
    return isValue(v) ? +v : "";
  };

  ChartInternal.prototype.defaultArcValueFormat = function (v, ratio) {
    return (ratio * 100).toFixed(1) + '%';
  };

  ChartInternal.prototype.dataLabelFormat = function (targetId) {
    var $$ = this,
        data_labels = $$.config.data_labels,
        format,
        defaultFormat = function defaultFormat(v) {
      return isValue(v) ? +v : "";
    }; // find format according to axis id


    if (typeof data_labels.format === 'function') {
      format = data_labels.format;
    } else if (_typeof(data_labels.format) === 'object') {
      if (data_labels.format[targetId]) {
        format = data_labels.format[targetId] === true ? defaultFormat : data_labels.format[targetId];
      } else {
        format = function format() {
          return '';
        };
      }
    } else {
      format = defaultFormat;
    }

    return format;
  };

  ChartInternal.prototype.initGrid = function () {
    var $$ = this,
        config = $$.config,
        d3 = $$.d3;
    $$.grid = $$.main.append('g').attr("clip-path", $$.clipPathForGrid).attr('class', CLASS.grid);

    if (config.grid_x_show) {
      $$.grid.append("g").attr("class", CLASS.xgrids);
    }

    if (config.grid_y_show) {
      $$.grid.append('g').attr('class', CLASS.ygrids);
    }

    if (config.grid_focus_show) {
      $$.grid.append('g').attr("class", CLASS.xgridFocus).append('line').attr('class', CLASS.xgridFocus);
    }

    $$.xgrid = d3.selectAll([]);

    if (!config.grid_lines_front) {
      $$.initGridLines();
    }
  };

  ChartInternal.prototype.initGridLines = function () {
    var $$ = this,
        d3 = $$.d3;
    $$.gridLines = $$.main.append('g').attr("clip-path", $$.clipPathForGrid).attr('class', CLASS.grid + ' ' + CLASS.gridLines);
    $$.gridLines.append('g').attr("class", CLASS.xgridLines);
    $$.gridLines.append('g').attr('class', CLASS.ygridLines);
    $$.xgridLines = d3.selectAll([]);
  };

  ChartInternal.prototype.updateXGrid = function (withoutUpdate) {
    var $$ = this,
        config = $$.config,
        d3 = $$.d3,
        xgridData = $$.generateGridData(config.grid_x_type, $$.x),
        tickOffset = $$.isCategorized() ? $$.xAxis.tickOffset() : 0;
    $$.xgridAttr = config.axis_rotated ? {
      'x1': 0,
      'x2': $$.width,
      'y1': function y1(d) {
        return $$.x(d) - tickOffset;
      },
      'y2': function y2(d) {
        return $$.x(d) - tickOffset;
      }
    } : {
      'x1': function x1(d) {
        return $$.x(d) + tickOffset;
      },
      'x2': function x2(d) {
        return $$.x(d) + tickOffset;
      },
      'y1': 0,
      'y2': $$.height
    };

    $$.xgridAttr.opacity = function () {
      var pos = +d3.select(this).attr(config.axis_rotated ? 'y1' : 'x1');
      return pos === (config.axis_rotated ? $$.height : 0) ? 0 : 1;
    };

    var xgrid = $$.main.select('.' + CLASS.xgrids).selectAll('.' + CLASS.xgrid).data(xgridData);
    var xgridEnter = xgrid.enter().append('line').attr("class", CLASS.xgrid).attr('x1', $$.xgridAttr.x1).attr('x2', $$.xgridAttr.x2).attr('y1', $$.xgridAttr.y1).attr('y2', $$.xgridAttr.y2).style("opacity", 0);
    $$.xgrid = xgridEnter.merge(xgrid);

    if (!withoutUpdate) {
      $$.xgrid.attr('x1', $$.xgridAttr.x1).attr('x2', $$.xgridAttr.x2).attr('y1', $$.xgridAttr.y1).attr('y2', $$.xgridAttr.y2).style("opacity", $$.xgridAttr.opacity);
    }

    xgrid.exit().remove();
  };

  ChartInternal.prototype.updateYGrid = function () {
    var $$ = this,
        config = $$.config,
        gridValues = $$.yAxis.tickValues() || $$.y.ticks(config.grid_y_ticks);
    var ygrid = $$.main.select('.' + CLASS.ygrids).selectAll('.' + CLASS.ygrid).data(gridValues);
    var ygridEnter = ygrid.enter().append('line') // TODO: x1, x2, y1, y2, opacity need to be set here maybe
    .attr('class', CLASS.ygrid);
    $$.ygrid = ygridEnter.merge(ygrid);
    $$.ygrid.attr("x1", config.axis_rotated ? $$.y : 0).attr("x2", config.axis_rotated ? $$.y : $$.width).attr("y1", config.axis_rotated ? 0 : $$.y).attr("y2", config.axis_rotated ? $$.height : $$.y);
    ygrid.exit().remove();
    $$.smoothLines($$.ygrid, 'grid');
  };

  ChartInternal.prototype.gridTextAnchor = function (d) {
    return d.position ? d.position : "end";
  };

  ChartInternal.prototype.gridTextDx = function (d) {
    return d.position === 'start' ? 4 : d.position === 'middle' ? 0 : -4;
  };

  ChartInternal.prototype.xGridTextX = function (d) {
    return d.position === 'start' ? -this.height : d.position === 'middle' ? -this.height / 2 : 0;
  };

  ChartInternal.prototype.yGridTextX = function (d) {
    return d.position === 'start' ? 0 : d.position === 'middle' ? this.width / 2 : this.width;
  };

  ChartInternal.prototype.updateGrid = function (duration) {
    var $$ = this,
        main = $$.main,
        config = $$.config,
        xgridLine,
        xgridLineEnter,
        ygridLine,
        ygridLineEnter,
        xv = $$.xv.bind($$),
        yv = $$.yv.bind($$),
        xGridTextX = $$.xGridTextX.bind($$),
        yGridTextX = $$.yGridTextX.bind($$); // hide if arc type

    $$.grid.style('visibility', $$.hasArcType() ? 'hidden' : 'visible');
    main.select('line.' + CLASS.xgridFocus).style("visibility", "hidden");

    if (config.grid_x_show) {
      $$.updateXGrid();
    }

    xgridLine = main.select('.' + CLASS.xgridLines).selectAll('.' + CLASS.xgridLine).data(config.grid_x_lines); // enter

    xgridLineEnter = xgridLine.enter().append('g').attr("class", function (d) {
      return CLASS.xgridLine + (d['class'] ? ' ' + d['class'] : '');
    });
    xgridLineEnter.append('line').attr("x1", config.axis_rotated ? 0 : xv).attr("x2", config.axis_rotated ? $$.width : xv).attr("y1", config.axis_rotated ? xv : 0).attr("y2", config.axis_rotated ? xv : $$.height).style("opacity", 0);
    xgridLineEnter.append('text').attr("text-anchor", $$.gridTextAnchor).attr("transform", config.axis_rotated ? "" : "rotate(-90)").attr("x", config.axis_rotated ? yGridTextX : xGridTextX).attr("y", xv).attr('dx', $$.gridTextDx).attr('dy', -5).style("opacity", 0); // udpate

    $$.xgridLines = xgridLineEnter.merge(xgridLine); // done in d3.transition() of the end of this function
    // exit

    xgridLine.exit().transition().duration(duration).style("opacity", 0).remove(); // Y-Grid

    if (config.grid_y_show) {
      $$.updateYGrid();
    }

    ygridLine = main.select('.' + CLASS.ygridLines).selectAll('.' + CLASS.ygridLine).data(config.grid_y_lines); // enter

    ygridLineEnter = ygridLine.enter().append('g').attr("class", function (d) {
      return CLASS.ygridLine + (d['class'] ? ' ' + d['class'] : '');
    });
    ygridLineEnter.append('line').attr("x1", config.axis_rotated ? yv : 0).attr("x2", config.axis_rotated ? yv : $$.width).attr("y1", config.axis_rotated ? 0 : yv).attr("y2", config.axis_rotated ? $$.height : yv).style("opacity", 0);
    ygridLineEnter.append('text').attr("text-anchor", $$.gridTextAnchor).attr("transform", config.axis_rotated ? "rotate(-90)" : "").attr("x", config.axis_rotated ? xGridTextX : yGridTextX).attr("y", yv).attr('dx', $$.gridTextDx).attr('dy', -5).style("opacity", 0); // update

    $$.ygridLines = ygridLineEnter.merge(ygridLine);
    $$.ygridLines.select('line').transition().duration(duration).attr("x1", config.axis_rotated ? yv : 0).attr("x2", config.axis_rotated ? yv : $$.width).attr("y1", config.axis_rotated ? 0 : yv).attr("y2", config.axis_rotated ? $$.height : yv).style("opacity", 1);
    $$.ygridLines.select('text').transition().duration(duration).attr("x", config.axis_rotated ? $$.xGridTextX.bind($$) : $$.yGridTextX.bind($$)).attr("y", yv).text(function (d) {
      return d.text;
    }).style("opacity", 1); // exit

    ygridLine.exit().transition().duration(duration).style("opacity", 0).remove();
  };

  ChartInternal.prototype.redrawGrid = function (withTransition, transition) {
    var $$ = this,
        config = $$.config,
        xv = $$.xv.bind($$),
        lines = $$.xgridLines.select('line'),
        texts = $$.xgridLines.select('text');
    return [(withTransition ? lines.transition(transition) : lines).attr("x1", config.axis_rotated ? 0 : xv).attr("x2", config.axis_rotated ? $$.width : xv).attr("y1", config.axis_rotated ? xv : 0).attr("y2", config.axis_rotated ? xv : $$.height).style("opacity", 1), (withTransition ? texts.transition(transition) : texts).attr("x", config.axis_rotated ? $$.yGridTextX.bind($$) : $$.xGridTextX.bind($$)).attr("y", xv).text(function (d) {
      return d.text;
    }).style("opacity", 1)];
  };

  ChartInternal.prototype.showXGridFocus = function (selectedData) {
    var $$ = this,
        config = $$.config,
        dataToShow = selectedData.filter(function (d) {
      return d && isValue(d.value);
    }),
        focusEl = $$.main.selectAll('line.' + CLASS.xgridFocus),
        xx = $$.xx.bind($$);

    if (!config.tooltip_show) {
      return;
    } // Hide when stanford plot exists


    if ($$.hasType('stanford') || $$.hasArcType()) {
      return;
    }

    focusEl.style("visibility", "visible").data([dataToShow[0]]).attr(config.axis_rotated ? 'y1' : 'x1', xx).attr(config.axis_rotated ? 'y2' : 'x2', xx);
    $$.smoothLines(focusEl, 'grid');
  };

  ChartInternal.prototype.hideXGridFocus = function () {
    this.main.select('line.' + CLASS.xgridFocus).style("visibility", "hidden");
  };

  ChartInternal.prototype.updateXgridFocus = function () {
    var $$ = this,
        config = $$.config;
    $$.main.select('line.' + CLASS.xgridFocus).attr("x1", config.axis_rotated ? 0 : -10).attr("x2", config.axis_rotated ? $$.width : -10).attr("y1", config.axis_rotated ? -10 : 0).attr("y2", config.axis_rotated ? -10 : $$.height);
  };

  ChartInternal.prototype.generateGridData = function (type, scale) {
    var $$ = this,
        gridData = [],
        xDomain,
        firstYear,
        lastYear,
        i,
        tickNum = $$.main.select("." + CLASS.axisX).selectAll('.tick').size();

    if (type === 'year') {
      xDomain = $$.getXDomain();
      firstYear = xDomain[0].getFullYear();
      lastYear = xDomain[1].getFullYear();

      for (i = firstYear; i <= lastYear; i++) {
        gridData.push(new Date(i + '-01-01 00:00:00'));
      }
    } else {
      gridData = scale.ticks(10);

      if (gridData.length > tickNum) {
        // use only int
        gridData = gridData.filter(function (d) {
          return ("" + d).indexOf('.') < 0;
        });
      }
    }

    return gridData;
  };

  ChartInternal.prototype.getGridFilterToRemove = function (params) {
    return params ? function (line) {
      var found = false;
      [].concat(params).forEach(function (param) {
        if ('value' in param && line.value === param.value || 'class' in param && line['class'] === param['class']) {
          found = true;
        }
      });
      return found;
    } : function () {
      return true;
    };
  };

  ChartInternal.prototype.removeGridLines = function (params, forX) {
    var $$ = this,
        config = $$.config,
        toRemove = $$.getGridFilterToRemove(params),
        toShow = function toShow(line) {
      return !toRemove(line);
    },
        classLines = forX ? CLASS.xgridLines : CLASS.ygridLines,
        classLine = forX ? CLASS.xgridLine : CLASS.ygridLine;

    $$.main.select('.' + classLines).selectAll('.' + classLine).filter(toRemove).transition().duration(config.transition_duration).style('opacity', 0).remove();

    if (forX) {
      config.grid_x_lines = config.grid_x_lines.filter(toShow);
    } else {
      config.grid_y_lines = config.grid_y_lines.filter(toShow);
    }
  };

  ChartInternal.prototype.initEventRect = function () {
    var $$ = this,
        config = $$.config;
    $$.main.select('.' + CLASS.chart).append("g").attr("class", CLASS.eventRects).style('fill-opacity', 0);
    $$.eventRect = $$.main.select('.' + CLASS.eventRects).append('rect').attr('class', CLASS.eventRect); // event rect handle zoom event as well

    if (config.zoom_enabled && $$.zoom) {
      $$.eventRect.call($$.zoom).on("dblclick.zoom", null);

      if (config.zoom_initialRange) {
        // WORKAROUND: Add transition to apply transform immediately when no subchart
        $$.eventRect.transition().duration(0).call($$.zoom.transform, $$.zoomTransform(config.zoom_initialRange));
      }
    }
  };

  ChartInternal.prototype.redrawEventRect = function () {
    var $$ = this,
        d3 = $$.d3,
        config = $$.config;

    function mouseout() {
      $$.svg.select('.' + CLASS.eventRect).style('cursor', null);
      $$.hideXGridFocus();
      $$.hideTooltip();
      $$.unexpandCircles();
      $$.unexpandBars();
    }

    var isHoveringDataPoint = function isHoveringDataPoint(mouse, closest) {
      return closest && ($$.isBarType(closest.id) || $$.dist(closest, mouse) < config.point_sensitivity);
    };

    var withName = function withName(d) {
      return d ? $$.addName(Object.assign({}, d)) : null;
    }; // rects for mouseover


    $$.main.select('.' + CLASS.eventRects).style('cursor', config.zoom_enabled ? config.axis_rotated ? 'ns-resize' : 'ew-resize' : null);
    $$.eventRect.attr('x', 0).attr('y', 0).attr('width', $$.width).attr('height', $$.height).on('mouseout', config.interaction_enabled ? function () {
      if (!config) {
        return;
      } // chart is destroyed


      if ($$.hasArcType()) {
        return;
      }

      if ($$.mouseover) {
        config.data_onmouseout.call($$.api, $$.mouseover);
        $$.mouseover = undefined;
      }

      mouseout();
    } : null).on('mousemove', config.interaction_enabled ? function () {
      // do nothing when dragging
      if ($$.dragging) {
        return;
      }

      var targetsToShow = $$.getTargetsToShow(); // do nothing if arc type

      if ($$.hasArcType(targetsToShow)) {
        return;
      }

      var mouse = d3.mouse(this);
      var closest = withName($$.findClosestFromTargets(targetsToShow, mouse));
      var isMouseCloseToDataPoint = isHoveringDataPoint(mouse, closest); // ensure onmouseout is always called if mousemove switch between 2 targets

      if ($$.mouseover && (!closest || closest.id !== $$.mouseover.id || closest.index !== $$.mouseover.index)) {
        config.data_onmouseout.call($$.api, $$.mouseover);
        $$.mouseover = undefined;
      }

      if (closest && !$$.mouseover) {
        config.data_onmouseover.call($$.api, closest);
        $$.mouseover = closest;
      } // show cursor as pointer if we're hovering a data point close enough


      $$.svg.select('.' + CLASS.eventRect).style('cursor', isMouseCloseToDataPoint ? 'pointer' : null); // if tooltip not grouped, we want to display only data from closest data point

      var showSingleDataPoint = !config.tooltip_grouped || $$.hasType('stanford', targetsToShow); // find data to highlight

      var selectedData;

      if (showSingleDataPoint) {
        if (closest) {
          selectedData = [closest];
        }
      } else {
        var closestByX;

        if (closest) {
          // reuse closest value
          closestByX = closest;
        } else {
          // try to find the closest value by X values from the mouse position
          var mouseX = config.axis_rotated ? mouse[1] : mouse[0];
          closestByX = $$.findClosestFromTargetsByX(targetsToShow, $$.x.invert(mouseX));
        } // highlight all data for this 'x' value


        if (closestByX) {
          selectedData = $$.filterByX(targetsToShow, closestByX.x);
        }
      } // ensure we have data to show


      if (!selectedData || selectedData.length === 0) {
        return mouseout();
      } // inject names for each point


      selectedData = selectedData.map(withName); // show tooltip

      $$.showTooltip(selectedData, this); // expand points

      if (config.point_focus_expand_enabled) {
        $$.unexpandCircles();
        selectedData.forEach(function (d) {
          $$.expandCircles(d.index, d.id, false);
        });
      } // expand bars


      $$.unexpandBars();
      selectedData.forEach(function (d) {
        $$.expandBars(d.index, d.id, false);
      }); // Show xgrid focus line

      $$.showXGridFocus(selectedData);
    } : null).on('click', config.interaction_enabled ? function () {
      var targetsToShow = $$.getTargetsToShow();

      if ($$.hasArcType(targetsToShow)) {
        return;
      }

      var mouse = d3.mouse(this);
      var closest = withName($$.findClosestFromTargets(targetsToShow, mouse));

      if (!isHoveringDataPoint(mouse, closest)) {
        return;
      } // select if selection enabled


      var sameXData;

      if (!config.data_selection_grouped || $$.isStanfordType(closest)) {
        sameXData = [closest];
      } else {
        sameXData = $$.filterByX(targetsToShow, closest.x);
      } // toggle selected state


      sameXData.forEach(function (d) {
        $$.main.selectAll('.' + CLASS.shapes + $$.getTargetSelectorSuffix(d.id)).selectAll('.' + CLASS.shape + '-' + d.index).each(function () {
          if (config.data_selection_grouped || $$.isWithinShape(this, d)) {
            $$.toggleShape(this, d, d.index);
          }
        });
      }); // call data_onclick on the closest data point

      if (closest) {
        var shape = $$.main.selectAll('.' + CLASS.shapes + $$.getTargetSelectorSuffix(closest.id)).select('.' + CLASS.shape + '-' + closest.index);
        config.data_onclick.call($$.api, closest, shape.node());
      }
    } : null).call(config.interaction_enabled && config.data_selection_draggable && $$.drag ? d3.drag().on('drag', function () {
      $$.drag(d3.mouse(this));
    }).on('start', function () {
      $$.dragstart(d3.mouse(this));
    }).on('end', function () {
      $$.dragend();
    }) : function () {});
  };

  ChartInternal.prototype.getMousePosition = function (data) {
    var $$ = this;
    return [$$.x(data.x), $$.getYScale(data.id)(data.value)];
  };

  ChartInternal.prototype.dispatchEvent = function (type, mouse) {
    var $$ = this,
        selector = '.' + CLASS.eventRect,
        eventRect = $$.main.select(selector).node(),
        box = eventRect.getBoundingClientRect(),
        x = box.left + (mouse ? mouse[0] : 0),
        y = box.top + (mouse ? mouse[1] : 0),
        event = document.createEvent("MouseEvents");
    event.initMouseEvent(type, true, true, window, 0, x, y, x, y, false, false, false, false, 0, null);
    eventRect.dispatchEvent(event);
  };

  ChartInternal.prototype.initLegend = function () {
    var $$ = this;
    $$.legendItemTextBox = {};
    $$.legendHasRendered = false;
    $$.legend = $$.svg.append("g").attr("transform", $$.getTranslate('legend'));

    if (!$$.config.legend_show) {
      $$.legend.style('visibility', 'hidden');
      $$.hiddenLegendIds = $$.mapToIds($$.data.targets);
      return;
    } // MEMO: call here to update legend box and tranlate for all
    // MEMO: translate will be upated by this, so transform not needed in updateLegend()


    $$.updateLegendWithDefaults();
  };

  ChartInternal.prototype.updateLegendWithDefaults = function () {
    var $$ = this;
    $$.updateLegend($$.mapToIds($$.data.targets), {
      withTransform: false,
      withTransitionForTransform: false,
      withTransition: false
    });
  };

  ChartInternal.prototype.updateSizeForLegend = function (legendHeight, legendWidth) {
    var $$ = this,
        config = $$.config,
        insetLegendPosition = {
      top: $$.isLegendTop ? $$.getCurrentPaddingTop() + config.legend_inset_y + 5.5 : $$.currentHeight - legendHeight - $$.getCurrentPaddingBottom() - config.legend_inset_y,
      left: $$.isLegendLeft ? $$.getCurrentPaddingLeft() + config.legend_inset_x + 0.5 : $$.currentWidth - legendWidth - $$.getCurrentPaddingRight() - config.legend_inset_x + 0.5
    };
    $$.margin3 = {
      top: $$.isLegendRight ? 0 : $$.isLegendInset ? insetLegendPosition.top : $$.currentHeight - legendHeight,
      right: NaN,
      bottom: 0,
      left: $$.isLegendRight ? $$.currentWidth - legendWidth : $$.isLegendInset ? insetLegendPosition.left : 0
    };
  };

  ChartInternal.prototype.transformLegend = function (withTransition) {
    var $$ = this;
    (withTransition ? $$.legend.transition() : $$.legend).attr("transform", $$.getTranslate('legend'));
  };

  ChartInternal.prototype.updateLegendStep = function (step) {
    this.legendStep = step;
  };

  ChartInternal.prototype.updateLegendItemWidth = function (w) {
    this.legendItemWidth = w;
  };

  ChartInternal.prototype.updateLegendItemHeight = function (h) {
    this.legendItemHeight = h;
  };

  ChartInternal.prototype.getLegendWidth = function () {
    var $$ = this;
    return $$.config.legend_show ? $$.isLegendRight || $$.isLegendInset ? $$.legendItemWidth * ($$.legendStep + 1) : $$.currentWidth : 0;
  };

  ChartInternal.prototype.getLegendHeight = function () {
    var $$ = this,
        h = 0;

    if ($$.config.legend_show) {
      if ($$.isLegendRight) {
        h = $$.currentHeight;
      } else {
        h = Math.max(20, $$.legendItemHeight) * ($$.legendStep + 1);
      }
    }

    return h;
  };

  ChartInternal.prototype.opacityForLegend = function (legendItem) {
    return legendItem.classed(CLASS.legendItemHidden) ? null : 1;
  };

  ChartInternal.prototype.opacityForUnfocusedLegend = function (legendItem) {
    return legendItem.classed(CLASS.legendItemHidden) ? null : 0.3;
  };

  ChartInternal.prototype.toggleFocusLegend = function (targetIds, focus) {
    var $$ = this;
    targetIds = $$.mapToTargetIds(targetIds);
    $$.legend.selectAll('.' + CLASS.legendItem).filter(function (id) {
      return targetIds.indexOf(id) >= 0;
    }).classed(CLASS.legendItemFocused, focus).transition().duration(100).style('opacity', function () {
      var opacity = focus ? $$.opacityForLegend : $$.opacityForUnfocusedLegend;
      return opacity.call($$, $$.d3.select(this));
    });
  };

  ChartInternal.prototype.revertLegend = function () {
    var $$ = this,
        d3 = $$.d3;
    $$.legend.selectAll('.' + CLASS.legendItem).classed(CLASS.legendItemFocused, false).transition().duration(100).style('opacity', function () {
      return $$.opacityForLegend(d3.select(this));
    });
  };

  ChartInternal.prototype.showLegend = function (targetIds) {
    var $$ = this,
        config = $$.config;

    if (!config.legend_show) {
      config.legend_show = true;
      $$.legend.style('visibility', 'visible');

      if (!$$.legendHasRendered) {
        $$.updateLegendWithDefaults();
      }
    }

    $$.removeHiddenLegendIds(targetIds);
    $$.legend.selectAll($$.selectorLegends(targetIds)).style('visibility', 'visible').transition().style('opacity', function () {
      return $$.opacityForLegend($$.d3.select(this));
    });
  };

  ChartInternal.prototype.hideLegend = function (targetIds) {
    var $$ = this,
        config = $$.config;

    if (config.legend_show && isEmpty(targetIds)) {
      config.legend_show = false;
      $$.legend.style('visibility', 'hidden');
    }

    $$.addHiddenLegendIds(targetIds);
    $$.legend.selectAll($$.selectorLegends(targetIds)).style('opacity', 0).style('visibility', 'hidden');
  };

  ChartInternal.prototype.clearLegendItemTextBoxCache = function () {
    this.legendItemTextBox = {};
  };

  ChartInternal.prototype.updateLegend = function (targetIds, options, transitions) {
    var $$ = this,
        config = $$.config;
    var xForLegend, xForLegendText, xForLegendRect, yForLegend, yForLegendText, yForLegendRect, x1ForLegendTile, x2ForLegendTile, yForLegendTile;
    var paddingTop = 4,
        paddingRight = 10,
        maxWidth = 0,
        maxHeight = 0,
        posMin = 10,
        tileWidth = config.legend_item_tile_width + 5;
    var l,
        totalLength = 0,
        offsets = {},
        widths = {},
        heights = {},
        margins = [0],
        steps = {},
        step = 0;
    var withTransition, withTransitionForTransform;
    var texts, rects, tiles, background; // Skip elements when their name is set to null

    targetIds = targetIds.filter(function (id) {
      return !isDefined(config.data_names[id]) || config.data_names[id] !== null;
    });
    options = options || {};
    withTransition = getOption(options, "withTransition", true);
    withTransitionForTransform = getOption(options, "withTransitionForTransform", true);

    function getTextBox(textElement, id) {
      if (!$$.legendItemTextBox[id]) {
        $$.legendItemTextBox[id] = $$.getTextRect(textElement.textContent, CLASS.legendItem, textElement);
      }

      return $$.legendItemTextBox[id];
    }

    function updatePositions(textElement, id, index) {
      var reset = index === 0,
          isLast = index === targetIds.length - 1,
          box = getTextBox(textElement, id),
          itemWidth = box.width + tileWidth + (isLast && !($$.isLegendRight || $$.isLegendInset) ? 0 : paddingRight) + config.legend_padding,
          itemHeight = box.height + paddingTop,
          itemLength = $$.isLegendRight || $$.isLegendInset ? itemHeight : itemWidth,
          areaLength = $$.isLegendRight || $$.isLegendInset ? $$.getLegendHeight() : $$.getLegendWidth(),
          margin,
          maxLength; // MEMO: care about condifion of step, totalLength

      function updateValues(id, withoutStep) {
        if (!withoutStep) {
          margin = (areaLength - totalLength - itemLength) / 2;

          if (margin < posMin) {
            margin = (areaLength - itemLength) / 2;
            totalLength = 0;
            step++;
          }
        }

        steps[id] = step;
        margins[step] = $$.isLegendInset ? 10 : margin;
        offsets[id] = totalLength;
        totalLength += itemLength;
      }

      if (reset) {
        totalLength = 0;
        step = 0;
        maxWidth = 0;
        maxHeight = 0;
      }

      if (config.legend_show && !$$.isLegendToShow(id)) {
        widths[id] = heights[id] = steps[id] = offsets[id] = 0;
        return;
      }

      widths[id] = itemWidth;
      heights[id] = itemHeight;

      if (!maxWidth || itemWidth >= maxWidth) {
        maxWidth = itemWidth;
      }

      if (!maxHeight || itemHeight >= maxHeight) {
        maxHeight = itemHeight;
      }

      maxLength = $$.isLegendRight || $$.isLegendInset ? maxHeight : maxWidth;

      if (config.legend_equally) {
        Object.keys(widths).forEach(function (id) {
          widths[id] = maxWidth;
        });
        Object.keys(heights).forEach(function (id) {
          heights[id] = maxHeight;
        });
        margin = (areaLength - maxLength * targetIds.length) / 2;

        if (margin < posMin) {
          totalLength = 0;
          step = 0;
          targetIds.forEach(function (id) {
            updateValues(id);
          });
        } else {
          updateValues(id, true);
        }
      } else {
        updateValues(id);
      }
    }

    if ($$.isLegendInset) {
      step = config.legend_inset_step ? config.legend_inset_step : targetIds.length;
      $$.updateLegendStep(step);
    }

    if ($$.isLegendRight) {
      xForLegend = function xForLegend(id) {
        return maxWidth * steps[id];
      };

      yForLegend = function yForLegend(id) {
        return margins[steps[id]] + offsets[id];
      };
    } else if ($$.isLegendInset) {
      xForLegend = function xForLegend(id) {
        return maxWidth * steps[id] + 10;
      };

      yForLegend = function yForLegend(id) {
        return margins[steps[id]] + offsets[id];
      };
    } else {
      xForLegend = function xForLegend(id) {
        return margins[steps[id]] + offsets[id];
      };

      yForLegend = function yForLegend(id) {
        return maxHeight * steps[id];
      };
    }

    xForLegendText = function xForLegendText(id, i) {
      return xForLegend(id, i) + 4 + config.legend_item_tile_width;
    };

    yForLegendText = function yForLegendText(id, i) {
      return yForLegend(id, i) + 9;
    };

    xForLegendRect = function xForLegendRect(id, i) {
      return xForLegend(id, i);
    };

    yForLegendRect = function yForLegendRect(id, i) {
      return yForLegend(id, i) - 5;
    };

    x1ForLegendTile = function x1ForLegendTile(id, i) {
      return xForLegend(id, i) - 2;
    };

    x2ForLegendTile = function x2ForLegendTile(id, i) {
      return xForLegend(id, i) - 2 + config.legend_item_tile_width;
    };

    yForLegendTile = function yForLegendTile(id, i) {
      return yForLegend(id, i) + 4;
    }; // Define g for legend area


    l = $$.legend.selectAll('.' + CLASS.legendItem).data(targetIds).enter().append('g').attr('class', function (id) {
      return $$.generateClass(CLASS.legendItem, id);
    }).style('visibility', function (id) {
      return $$.isLegendToShow(id) ? 'visible' : 'hidden';
    }).style('cursor', 'pointer').on('click', function (id) {
      if (config.legend_item_onclick) {
        config.legend_item_onclick.call($$, id);
      } else {
        if ($$.d3.event.altKey) {
          $$.api.hide();
          $$.api.show(id);
        } else {
          $$.api.toggle(id);
          $$.isTargetToShow(id) ? $$.api.focus(id) : $$.api.revert();
        }
      }
    }).on('mouseover', function (id) {
      if (config.legend_item_onmouseover) {
        config.legend_item_onmouseover.call($$, id);
      } else {
        $$.d3.select(this).classed(CLASS.legendItemFocused, true);

        if (!$$.transiting && $$.isTargetToShow(id)) {
          $$.api.focus(id);
        }
      }
    }).on('mouseout', function (id) {
      if (config.legend_item_onmouseout) {
        config.legend_item_onmouseout.call($$, id);
      } else {
        $$.d3.select(this).classed(CLASS.legendItemFocused, false);
        $$.api.revert();
      }
    });
    l.append('text').text(function (id) {
      return isDefined(config.data_names[id]) ? config.data_names[id] : id;
    }).each(function (id, i) {
      updatePositions(this, id, i);
    }).style("pointer-events", "none").attr('x', $$.isLegendRight || $$.isLegendInset ? xForLegendText : -200).attr('y', $$.isLegendRight || $$.isLegendInset ? -200 : yForLegendText);
    l.append('rect').attr("class", CLASS.legendItemEvent).style('fill-opacity', 0).attr('x', $$.isLegendRight || $$.isLegendInset ? xForLegendRect : -200).attr('y', $$.isLegendRight || $$.isLegendInset ? -200 : yForLegendRect);
    l.append('line').attr('class', CLASS.legendItemTile).style('stroke', $$.color).style("pointer-events", "none").attr('x1', $$.isLegendRight || $$.isLegendInset ? x1ForLegendTile : -200).attr('y1', $$.isLegendRight || $$.isLegendInset ? -200 : yForLegendTile).attr('x2', $$.isLegendRight || $$.isLegendInset ? x2ForLegendTile : -200).attr('y2', $$.isLegendRight || $$.isLegendInset ? -200 : yForLegendTile).attr('stroke-width', config.legend_item_tile_height); // Set background for inset legend

    background = $$.legend.select('.' + CLASS.legendBackground + ' rect');

    if ($$.isLegendInset && maxWidth > 0 && background.size() === 0) {
      background = $$.legend.insert('g', '.' + CLASS.legendItem).attr("class", CLASS.legendBackground).append('rect');
    }

    texts = $$.legend.selectAll('text').data(targetIds).text(function (id) {
      return isDefined(config.data_names[id]) ? config.data_names[id] : id;
    }) // MEMO: needed for update
    .each(function (id, i) {
      updatePositions(this, id, i);
    });
    (withTransition ? texts.transition() : texts).attr('x', xForLegendText).attr('y', yForLegendText);
    rects = $$.legend.selectAll('rect.' + CLASS.legendItemEvent).data(targetIds);
    (withTransition ? rects.transition() : rects).attr('width', function (id) {
      return widths[id];
    }).attr('height', function (id) {
      return heights[id];
    }).attr('x', xForLegendRect).attr('y', yForLegendRect);
    tiles = $$.legend.selectAll('line.' + CLASS.legendItemTile).data(targetIds);
    (withTransition ? tiles.transition() : tiles).style('stroke', $$.levelColor ? function (id) {
      return $$.levelColor($$.cache[id].values.reduce(function (total, item) {
        return total + item.value;
      }, 0));
    } : $$.color).attr('x1', x1ForLegendTile).attr('y1', yForLegendTile).attr('x2', x2ForLegendTile).attr('y2', yForLegendTile);

    if (background) {
      (withTransition ? background.transition() : background).attr('height', $$.getLegendHeight() - 12).attr('width', maxWidth * (step + 1) + 10);
    } // toggle legend state


    $$.legend.selectAll('.' + CLASS.legendItem).classed(CLASS.legendItemHidden, function (id) {
      return !$$.isTargetToShow(id);
    }); // Update all to reflect change of legend

    $$.updateLegendItemWidth(maxWidth);
    $$.updateLegendItemHeight(maxHeight);
    $$.updateLegendStep(step); // Update size and scale

    $$.updateSizes();
    $$.updateScales();
    $$.updateSvgSize(); // Update g positions

    $$.transformAll(withTransitionForTransform, transitions);
    $$.legendHasRendered = true;
  };

  ChartInternal.prototype.initRegion = function () {
    var $$ = this;
    $$.region = $$.main.append('g').attr("clip-path", $$.clipPath).attr("class", CLASS.regions);
  };

  ChartInternal.prototype.updateRegion = function (duration) {
    var $$ = this,
        config = $$.config; // hide if arc type

    $$.region.style('visibility', $$.hasArcType() ? 'hidden' : 'visible');
    var mainRegion = $$.main.select('.' + CLASS.regions).selectAll('.' + CLASS.region).data(config.regions);
    var g = mainRegion.enter().append('g');
    g.append('rect').attr("x", $$.regionX.bind($$)).attr("y", $$.regionY.bind($$)).attr("width", $$.regionWidth.bind($$)).attr("height", $$.regionHeight.bind($$)).style("fill-opacity", function (d) {
      return isValue(d.opacity) ? d.opacity : 0.1;
    });
    g.append('text').text($$.labelRegion.bind($$));
    $$.mainRegion = g.merge(mainRegion).attr('class', $$.classRegion.bind($$));
    mainRegion.exit().transition().duration(duration).style("opacity", 0).remove();
  };

  ChartInternal.prototype.redrawRegion = function (withTransition, transition) {
    var $$ = this,
        regions = $$.mainRegion,
        regionLabels = $$.mainRegion.selectAll('text');
    return [(withTransition ? regions.transition(transition) : regions).attr("x", $$.regionX.bind($$)).attr("y", $$.regionY.bind($$)).attr("width", $$.regionWidth.bind($$)).attr("height", $$.regionHeight.bind($$)).style("fill-opacity", function (d) {
      return isValue(d.opacity) ? d.opacity : 0.1;
    }), (withTransition ? regionLabels.transition(transition) : regionLabels).attr("x", $$.labelOffsetX.bind($$)).attr("y", $$.labelOffsetY.bind($$)).attr("transform", $$.labelTransform.bind($$)).attr("style", 'text-anchor: left;')];
  };

  ChartInternal.prototype.regionX = function (d) {
    var $$ = this,
        config = $$.config,
        xPos,
        yScale = d.axis === 'y' ? $$.y : $$.y2;

    if (d.axis === 'y' || d.axis === 'y2') {
      xPos = config.axis_rotated ? 'start' in d ? yScale(d.start) : 0 : 0;
    } else {
      xPos = config.axis_rotated ? 0 : 'start' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.start) : d.start) : 0;
    }

    return xPos;
  };

  ChartInternal.prototype.regionY = function (d) {
    var $$ = this,
        config = $$.config,
        yPos,
        yScale = d.axis === 'y' ? $$.y : $$.y2;

    if (d.axis === 'y' || d.axis === 'y2') {
      yPos = config.axis_rotated ? 0 : 'end' in d ? yScale(d.end) : 0;
    } else {
      yPos = config.axis_rotated ? 'start' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.start) : d.start) : 0 : 0;
    }

    return yPos;
  };

  ChartInternal.prototype.regionWidth = function (d) {
    var $$ = this,
        config = $$.config,
        start = $$.regionX(d),
        end,
        yScale = d.axis === 'y' ? $$.y : $$.y2;

    if (d.axis === 'y' || d.axis === 'y2') {
      end = config.axis_rotated ? 'end' in d ? yScale(d.end) : $$.width : $$.width;
    } else {
      end = config.axis_rotated ? $$.width : 'end' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.end) : d.end) : $$.width;
    }

    return end < start ? 0 : end - start;
  };

  ChartInternal.prototype.regionHeight = function (d) {
    var $$ = this,
        config = $$.config,
        start = this.regionY(d),
        end,
        yScale = d.axis === 'y' ? $$.y : $$.y2;

    if (d.axis === 'y' || d.axis === 'y2') {
      end = config.axis_rotated ? $$.height : 'start' in d ? yScale(d.start) : $$.height;
    } else {
      end = config.axis_rotated ? 'end' in d ? $$.x($$.isTimeSeries() ? $$.parseDate(d.end) : d.end) : $$.height : $$.height;
    }

    return end < start ? 0 : end - start;
  };

  ChartInternal.prototype.isRegionOnX = function (d) {
    return !d.axis || d.axis === 'x';
  };

  ChartInternal.prototype.labelRegion = function (d) {
    return 'label' in d ? d.label : '';
  };

  ChartInternal.prototype.labelTransform = function (d) {
    return 'vertical' in d && d.vertical ? "rotate(90)" : "";
  };

  ChartInternal.prototype.labelOffsetX = function (d) {
    var paddingX = 'paddingX' in d ? d.paddingX : 3;
    var paddingY = 'paddingY' in d ? d.paddingY : 3;
    return 'vertical' in d && d.vertical ? this.regionY(d) + paddingY : this.regionX(d) + paddingX;
  };

  ChartInternal.prototype.labelOffsetY = function (d) {
    var paddingX = 'paddingX' in d ? d.paddingX : 3;
    var paddingY = 'paddingY' in d ? d.paddingY : 3;
    return 'vertical' in d && d.vertical ? -(this.regionX(d) + paddingX) : this.regionY(d) + 10 + paddingY;
  };

  function c3LogScale(d3, linearScale, logScale) {
    var PROJECTION = [0.01, 10];

    if (!linearScale) {
      linearScale = d3.scaleLinear();
      linearScale.range(PROJECTION);
    }

    if (!logScale) {
      logScale = d3.scaleLog();
      logScale.domain(PROJECTION);
      logScale.nice();
    } // copied from https://github.com/compute-io/logspace


    function logspace(a, b, len) {
      var arr, end, tmp, d;

      if (arguments.length < 3) {
        len = 10;
      } else {
        if (len === 0) {
          return [];
        }
      } // Calculate the increment:


      end = len - 1;
      d = (b - a) / end; // Build the output array...

      arr = new Array(len);
      tmp = a;
      arr[0] = Math.pow(10, tmp);

      for (var i = 1; i < end; i++) {
        tmp += d;
        arr[i] = Math.pow(10, tmp);
      }

      arr[end] = Math.pow(10, b);
      return arr;
    }

    function scale(x) {
      return logScale(linearScale(x));
    }

    scale.domain = function (x) {
      if (!arguments.length) {
        return linearScale.domain();
      }

      linearScale.domain(x);
      return scale;
    };

    scale.range = function (x) {
      if (!arguments.length) {
        return logScale.range();
      }

      logScale.range(x);
      return scale;
    };

    scale.ticks = function (m) {
      return logspace(-2, 1, m || 10).map(function (v) {
        return linearScale.invert(v);
      });
    };

    scale.copy = function () {
      return c3LogScale(d3, linearScale.copy(), logScale.copy());
    };

    return scale;
  }

  ChartInternal.prototype.getScale = function (min, max, forTimeseries) {
    return (forTimeseries ? this.d3.scaleTime() : this.d3.scaleLinear()).range([min, max]);
  };

  ChartInternal.prototype.getX = function (min, max, domain, offset) {
    var $$ = this,
        scale = $$.getScale(min, max, $$.isTimeSeries()),
        _scale = domain ? scale.domain(domain) : scale,
        key; // Define customized scale if categorized axis


    if ($$.isCategorized()) {
      offset = offset || function () {
        return 0;
      };

      scale = function scale(d, raw) {
        var v = _scale(d) + offset(d);
        return raw ? v : Math.ceil(v);
      };
    } else {
      scale = function scale(d, raw) {
        var v = _scale(d);

        return raw ? v : Math.ceil(v);
      };
    } // define functions


    for (key in _scale) {
      scale[key] = _scale[key];
    }

    scale.orgDomain = function () {
      return _scale.domain();
    }; // define custom domain() for categorized axis


    if ($$.isCategorized()) {
      scale.domain = function (domain) {
        if (!arguments.length) {
          domain = this.orgDomain();
          return [domain[0], domain[1] + 1];
        }

        _scale.domain(domain);

        return scale;
      };
    }

    return scale;
  };
  /**
   * Creates and configures a D3 scale instance for the given type.
   *
   * By defaults it returns a Linear scale.
   *
   * @param {String} type Type of d3-scale to create. Type can be 'linear', 'time', 'timeseries' or 'log'.
   * @param {Array} domain The scale domain such as [from, to]
   * @param {Array} range The scale's range such as [from, to]
   *
   * @return A d3-scale instance
   */


  ChartInternal.prototype.getY = function (type, domain, range) {
    var scale;

    if (type === 'timeseries' || type === 'time') {
      scale = this.d3.scaleTime();
    } else if (type === 'log') {
      scale = c3LogScale(this.d3);
    } else if (type === 'linear' || type === undefined) {
      scale = this.d3.scaleLinear();
    } else {
      throw new Error("Invalid Y axis type: \"".concat(type, "\""));
    }

    if (domain) {
      scale.domain(domain);
    }

    if (range) {
      scale.range(range);
    }

    return scale;
  };

  ChartInternal.prototype.getYScale = function (id) {
    return this.axis.getId(id) === 'y2' ? this.y2 : this.y;
  };

  ChartInternal.prototype.getSubYScale = function (id) {
    return this.axis.getId(id) === 'y2' ? this.subY2 : this.subY;
  };

  ChartInternal.prototype.updateScales = function () {
    var $$ = this,
        config = $$.config,
        forInit = !$$.x; // update edges

    $$.xMin = config.axis_rotated ? 1 : 0;
    $$.xMax = config.axis_rotated ? $$.height : $$.width;
    $$.yMin = config.axis_rotated ? 0 : $$.height;
    $$.yMax = config.axis_rotated ? $$.width : 1;
    $$.subXMin = $$.xMin;
    $$.subXMax = $$.xMax;
    $$.subYMin = config.axis_rotated ? 0 : $$.height2;
    $$.subYMax = config.axis_rotated ? $$.width2 : 1; // update scales

    $$.x = $$.getX($$.xMin, $$.xMax, forInit ? undefined : $$.x.orgDomain(), function () {
      return $$.xAxis.tickOffset();
    });
    $$.y = $$.getY(config.axis_y_type, forInit ? config.axis_y_default : $$.y.domain(), [$$.yMin, $$.yMax]);
    $$.y2 = $$.getY(config.axis_y2_type, forInit ? config.axis_y2_default : $$.y2.domain(), [$$.yMin, $$.yMax]);
    $$.subX = $$.getX($$.xMin, $$.xMax, $$.orgXDomain, function (d) {
      return d % 1 ? 0 : $$.subXAxis.tickOffset();
    });
    $$.subY = $$.getY(config.axis_y_type, forInit ? config.axis_y_default : $$.subY.domain(), [$$.subYMin, $$.subYMax]);
    $$.subY2 = $$.getY(config.axis_y2_type, forInit ? config.axis_y2_default : $$.subY2.domain(), [$$.subYMin, $$.subYMax]); // update axes

    $$.xAxisTickFormat = $$.axis.getXAxisTickFormat();
    $$.xAxisTickValues = $$.axis.getXAxisTickValues();
    $$.yAxisTickValues = $$.axis.getYAxisTickValues();
    $$.y2AxisTickValues = $$.axis.getY2AxisTickValues();
    $$.xAxis = $$.axis.getXAxis($$.x, $$.xOrient, $$.xAxisTickFormat, $$.xAxisTickValues, config.axis_x_tick_outer);
    $$.subXAxis = $$.axis.getXAxis($$.subX, $$.subXOrient, $$.xAxisTickFormat, $$.xAxisTickValues, config.axis_x_tick_outer);
    $$.yAxis = $$.axis.getYAxis('y', $$.y, $$.yOrient, $$.yAxisTickValues, config.axis_y_tick_outer);
    $$.y2Axis = $$.axis.getYAxis('y2', $$.y2, $$.y2Orient, $$.y2AxisTickValues, config.axis_y2_tick_outer); // Set initialized scales to brush and zoom

    if (!forInit) {
      if ($$.brush) {
        $$.brush.updateScale($$.subX);
      }
    } // update for arc


    if ($$.updateArc) {
      $$.updateArc();
    }
  };

  ChartInternal.prototype.selectPoint = function (target, d, i) {
    var $$ = this,
        config = $$.config,
        cx = (config.axis_rotated ? $$.circleY : $$.circleX).bind($$),
        cy = (config.axis_rotated ? $$.circleX : $$.circleY).bind($$),
        r = $$.pointSelectR.bind($$);
    config.data_onselected.call($$.api, d, target.node()); // add selected-circle on low layer g

    $$.main.select('.' + CLASS.selectedCircles + $$.getTargetSelectorSuffix(d.id)).selectAll('.' + CLASS.selectedCircle + '-' + i).data([d]).enter().append('circle').attr("class", function () {
      return $$.generateClass(CLASS.selectedCircle, i);
    }).attr("cx", cx).attr("cy", cy).attr("stroke", function () {
      return $$.color(d);
    }).attr("r", function (d) {
      return $$.pointSelectR(d) * 1.4;
    }).transition().duration(100).attr("r", r);
  };

  ChartInternal.prototype.unselectPoint = function (target, d, i) {
    var $$ = this;
    $$.config.data_onunselected.call($$.api, d, target.node()); // remove selected-circle from low layer g

    $$.main.select('.' + CLASS.selectedCircles + $$.getTargetSelectorSuffix(d.id)).selectAll('.' + CLASS.selectedCircle + '-' + i).transition().duration(100).attr('r', 0).remove();
  };

  ChartInternal.prototype.togglePoint = function (selected, target, d, i) {
    selected ? this.selectPoint(target, d, i) : this.unselectPoint(target, d, i);
  };

  ChartInternal.prototype.selectPath = function (target, d) {
    var $$ = this;
    $$.config.data_onselected.call($$, d, target.node());

    if ($$.config.interaction_brighten) {
      target.transition().duration(100).style("fill", function () {
        return $$.d3.rgb($$.color(d)).brighter(0.75);
      });
    }
  };

  ChartInternal.prototype.unselectPath = function (target, d) {
    var $$ = this;
    $$.config.data_onunselected.call($$, d, target.node());

    if ($$.config.interaction_brighten) {
      target.transition().duration(100).style("fill", function () {
        return $$.color(d);
      });
    }
  };

  ChartInternal.prototype.togglePath = function (selected, target, d, i) {
    selected ? this.selectPath(target, d, i) : this.unselectPath(target, d, i);
  };

  ChartInternal.prototype.getToggle = function (that, d) {
    var $$ = this,
        toggle;

    if (that.nodeName === 'circle') {
      if ($$.isStepType(d)) {
        // circle is hidden in step chart, so treat as within the click area
        toggle = function toggle() {}; // TODO: how to select step chart?

      } else {
        toggle = $$.togglePoint;
      }
    } else if (that.nodeName === 'path') {
      toggle = $$.togglePath;
    }

    return toggle;
  };

  ChartInternal.prototype.toggleShape = function (that, d, i) {
    var $$ = this,
        d3 = $$.d3,
        config = $$.config,
        shape = d3.select(that),
        isSelected = shape.classed(CLASS.SELECTED),
        toggle = $$.getToggle(that, d).bind($$);

    if (config.data_selection_enabled && config.data_selection_isselectable(d)) {
      if (!config.data_selection_multiple) {
        $$.main.selectAll('.' + CLASS.shapes + (config.data_selection_grouped ? $$.getTargetSelectorSuffix(d.id) : "")).selectAll('.' + CLASS.shape).each(function (d, i) {
          var shape = d3.select(this);

          if (shape.classed(CLASS.SELECTED)) {
            toggle(false, shape.classed(CLASS.SELECTED, false), d, i);
          }
        });
      }

      shape.classed(CLASS.SELECTED, !isSelected);
      toggle(!isSelected, shape, d, i);
    }
  };

  ChartInternal.prototype.initBar = function () {
    var $$ = this;
    $$.main.select('.' + CLASS.chart).append("g").attr("class", CLASS.chartBars);
  };

  ChartInternal.prototype.updateTargetsForBar = function (targets) {
    var $$ = this,
        config = $$.config,
        mainBars,
        mainBarEnter,
        classChartBar = $$.classChartBar.bind($$),
        classBars = $$.classBars.bind($$),
        classFocus = $$.classFocus.bind($$);
    mainBars = $$.main.select('.' + CLASS.chartBars).selectAll('.' + CLASS.chartBar).data(targets).attr('class', function (d) {
      return classChartBar(d) + classFocus(d);
    });
    mainBarEnter = mainBars.enter().append('g').attr('class', classChartBar).style("pointer-events", "none"); // Bars for each data

    mainBarEnter.append('g').attr("class", classBars).style("cursor", function (d) {
      return config.data_selection_isselectable(d) ? "pointer" : null;
    });
  };

  ChartInternal.prototype.updateBar = function (durationForExit) {
    var $$ = this,
        barData = $$.barData.bind($$),
        classBar = $$.classBar.bind($$),
        initialOpacity = $$.initialOpacity.bind($$),
        color = function color(d) {
      return $$.color(d.id);
    };

    var mainBar = $$.main.selectAll('.' + CLASS.bars).selectAll('.' + CLASS.bar).data(barData);
    var mainBarEnter = mainBar.enter().append('path').attr("class", classBar).style("stroke", color).style("fill", color);
    $$.mainBar = mainBarEnter.merge(mainBar).style("opacity", initialOpacity);
    mainBar.exit().transition().duration(durationForExit).style("opacity", 0);
  };

  ChartInternal.prototype.redrawBar = function (drawBar, withTransition, transition) {
    var $$ = this;
    return [(withTransition ? this.mainBar.transition(transition) : this.mainBar).attr('d', drawBar).style("stroke", this.color).style("fill", this.color).style("opacity", function (d) {
      return $$.isTargetToShow(d.id) ? 1 : 0;
    })];
  };

  ChartInternal.prototype.getBarW = function (axis, barTargetsNum) {
    var $$ = this,
        config = $$.config,
        w = typeof config.bar_width === 'number' ? config.bar_width : barTargetsNum ? axis.tickInterval() * config.bar_width_ratio / barTargetsNum : 0;
    return config.bar_width_max && w > config.bar_width_max ? config.bar_width_max : w;
  };

  ChartInternal.prototype.getBars = function (i, id) {
    var $$ = this;
    return (id ? $$.main.selectAll('.' + CLASS.bars + $$.getTargetSelectorSuffix(id)) : $$.main).selectAll('.' + CLASS.bar + (isValue(i) ? '-' + i : ''));
  };

  ChartInternal.prototype.expandBars = function (i, id, reset) {
    var $$ = this;

    if (reset) {
      $$.unexpandBars();
    }

    $$.getBars(i, id).classed(CLASS.EXPANDED, true);
  };

  ChartInternal.prototype.unexpandBars = function (i) {
    var $$ = this;
    $$.getBars(i).classed(CLASS.EXPANDED, false);
  };

  ChartInternal.prototype.generateDrawBar = function (barIndices, isSub) {
    var $$ = this,
        config = $$.config,
        getPoints = $$.generateGetBarPoints(barIndices, isSub);
    return function (d, i) {
      // 4 points that make a bar
      var points = getPoints(d, i); // switch points if axis is rotated, not applicable for sub chart

      var indexX = config.axis_rotated ? 1 : 0;
      var indexY = config.axis_rotated ? 0 : 1;
      var path = 'M ' + points[0][indexX] + ',' + points[0][indexY] + ' ' + 'L' + points[1][indexX] + ',' + points[1][indexY] + ' ' + 'L' + points[2][indexX] + ',' + points[2][indexY] + ' ' + 'L' + points[3][indexX] + ',' + points[3][indexY] + ' ' + 'z';
      return path;
    };
  };

  ChartInternal.prototype.generateGetBarPoints = function (barIndices, isSub) {
    var $$ = this,
        axis = isSub ? $$.subXAxis : $$.xAxis,
        barTargetsNum = barIndices.__max__ + 1,
        barW = $$.getBarW(axis, barTargetsNum),
        barX = $$.getShapeX(barW, barTargetsNum, barIndices, !!isSub),
        barY = $$.getShapeY(!!isSub),
        barOffset = $$.getShapeOffset($$.isBarType, barIndices, !!isSub),
        barSpaceOffset = barW * ($$.config.bar_space / 2),
        yScale = isSub ? $$.getSubYScale : $$.getYScale;
    return function (d, i) {
      var y0 = yScale.call($$, d.id)(0),
          offset = barOffset(d, i) || y0,
          // offset is for stacked bar chart
      posX = barX(d),
          posY = barY(d); // fix posY not to overflow opposite quadrant

      if ($$.config.axis_rotated) {
        if (0 < d.value && posY < y0 || d.value < 0 && y0 < posY) {
          posY = y0;
        }
      }

      posY -= y0 - offset; // 4 points that make a bar

      return [[posX + barSpaceOffset, offset], [posX + barSpaceOffset, posY], [posX + barW - barSpaceOffset, posY], [posX + barW - barSpaceOffset, offset]];
    };
  };
  /**
   * Returns whether the data point is within the given bar shape.
   *
   * @param mouse
   * @param barShape
   * @return {boolean}
   */


  ChartInternal.prototype.isWithinBar = function (mouse, barShape) {
    return isWithinBox(mouse, getBBox(barShape), 2);
  };

  ChartInternal.prototype.getShapeIndices = function (typeFilter) {
    var $$ = this,
        config = $$.config,
        indices = {},
        i = 0,
        j,
        k;
    $$.filterTargetsToShow($$.data.targets.filter(typeFilter, $$)).forEach(function (d) {
      for (j = 0; j < config.data_groups.length; j++) {
        if (config.data_groups[j].indexOf(d.id) < 0) {
          continue;
        }

        for (k = 0; k < config.data_groups[j].length; k++) {
          if (config.data_groups[j][k] in indices) {
            indices[d.id] = indices[config.data_groups[j][k]];
            break;
          }
        }
      }

      if (isUndefined(indices[d.id])) {
        indices[d.id] = i++;
      }
    });
    indices.__max__ = i - 1;
    return indices;
  };

  ChartInternal.prototype.getShapeX = function (offset, targetsNum, indices, isSub) {
    var $$ = this,
        scale = isSub ? $$.subX : $$.x;
    return function (d) {
      var index = d.id in indices ? indices[d.id] : 0;
      return d.x || d.x === 0 ? scale(d.x) - offset * (targetsNum / 2 - index) : 0;
    };
  };

  ChartInternal.prototype.getShapeY = function (isSub) {
    var $$ = this;
    return function (d) {
      var scale = isSub ? $$.getSubYScale(d.id) : $$.getYScale(d.id);
      return scale($$.isTargetNormalized(d.id) ? $$.getRatio('index', d, true) : d.value);
    };
  };

  ChartInternal.prototype.getShapeOffset = function (typeFilter, indices, isSub) {
    var $$ = this,
        targets = $$.orderTargets($$.filterTargetsToShow($$.data.targets.filter(typeFilter, $$))),
        targetIds = targets.map(function (t) {
      return t.id;
    });
    return function (d, i) {
      var scale = isSub ? $$.getSubYScale(d.id) : $$.getYScale(d.id),
          y0 = scale(0),
          offset = y0;
      targets.forEach(function (t) {
        var rowValues = $$.isStepType(d) ? $$.convertValuesToStep(t.values) : t.values;
        var isTargetNormalized = $$.isTargetNormalized(d.id);
        var values = rowValues.map(function (v) {
          return isTargetNormalized ? $$.getRatio("index", v, true) : v.value;
        });

        if (t.id === d.id || indices[t.id] !== indices[d.id]) {
          return;
        }

        if (targetIds.indexOf(t.id) < targetIds.indexOf(d.id)) {
          // check if the x values line up
          if (isUndefined(rowValues[i]) || +rowValues[i].x !== +d.x) {
            // "+" for timeseries
            // if not, try to find the value that does line up
            i = -1;
            rowValues.forEach(function (v, j) {
              var x1 = v.x.constructor === Date ? +v.x : v.x;
              var x2 = d.x.constructor === Date ? +d.x : d.x;

              if (x1 === x2) {
                i = j;
              }
            });
          }

          if (i in rowValues && rowValues[i].value * d.value >= 0) {
            offset += scale(values[i]) - y0;
          }
        }
      });
      return offset;
    };
  };

  ChartInternal.prototype.isWithinShape = function (that, d) {
    var $$ = this,
        shape = $$.d3.select(that),
        isWithin;

    if (!$$.isTargetToShow(d.id)) {
      isWithin = false;
    } else if (that.nodeName === 'circle') {
      isWithin = $$.isStepType(d) ? $$.isWithinStep(that, $$.getYScale(d.id)(d.value)) : $$.isWithinCircle(that, $$.pointSelectR(d) * 1.5);
    } else if (that.nodeName === 'path') {
      isWithin = shape.classed(CLASS.bar) ? $$.isWithinBar($$.d3.mouse(that), that) : true;
    }

    return isWithin;
  };

  ChartInternal.prototype.getInterpolate = function (d) {
    var $$ = this,
        d3 = $$.d3,
        types = {
      'linear': d3.curveLinear,
      'linear-closed': d3.curveLinearClosed,
      'basis': d3.curveBasis,
      'basis-open': d3.curveBasisOpen,
      'basis-closed': d3.curveBasisClosed,
      'bundle': d3.curveBundle,
      'cardinal': d3.curveCardinal,
      'cardinal-open': d3.curveCardinalOpen,
      'cardinal-closed': d3.curveCardinalClosed,
      'monotone': d3.curveMonotoneX,
      'step': d3.curveStep,
      'step-before': d3.curveStepBefore,
      'step-after': d3.curveStepAfter
    },
        type;

    if ($$.isSplineType(d)) {
      type = types[$$.config.spline_interpolation_type] || types.cardinal;
    } else if ($$.isStepType(d)) {
      type = types[$$.config.line_step_type];
    } else {
      type = types.linear;
    }

    return type;
  };

  ChartInternal.prototype.initLine = function () {
    var $$ = this;
    $$.main.select('.' + CLASS.chart).append("g").attr("class", CLASS.chartLines);
  };

  ChartInternal.prototype.updateTargetsForLine = function (targets) {
    var $$ = this,
        config = $$.config,
        mainLines,
        mainLineEnter,
        classChartLine = $$.classChartLine.bind($$),
        classLines = $$.classLines.bind($$),
        classAreas = $$.classAreas.bind($$),
        classCircles = $$.classCircles.bind($$),
        classFocus = $$.classFocus.bind($$);
    mainLines = $$.main.select('.' + CLASS.chartLines).selectAll('.' + CLASS.chartLine).data(targets).attr('class', function (d) {
      return classChartLine(d) + classFocus(d);
    });
    mainLineEnter = mainLines.enter().append('g').attr('class', classChartLine).style('opacity', 0).style("pointer-events", "none"); // Lines for each data

    mainLineEnter.append('g').attr("class", classLines); // Areas

    mainLineEnter.append('g').attr('class', classAreas); // Circles for each data point on lines

    mainLineEnter.append('g').attr("class", function (d) {
      return $$.generateClass(CLASS.selectedCircles, d.id);
    });
    mainLineEnter.append('g').attr("class", classCircles).style("cursor", function (d) {
      return config.data_selection_isselectable(d) ? "pointer" : null;
    }); // Update date for selected circles

    targets.forEach(function (t) {
      $$.main.selectAll('.' + CLASS.selectedCircles + $$.getTargetSelectorSuffix(t.id)).selectAll('.' + CLASS.selectedCircle).each(function (d) {
        d.value = t.values[d.index].value;
      });
    }); // MEMO: can not keep same color...
    //mainLineUpdate.exit().remove();
  };

  ChartInternal.prototype.updateLine = function (durationForExit) {
    var $$ = this;
    var mainLine = $$.main.selectAll('.' + CLASS.lines).selectAll('.' + CLASS.line).data($$.lineData.bind($$));
    var mainLineEnter = mainLine.enter().append('path').attr('class', $$.classLine.bind($$)).style("stroke", $$.color);
    $$.mainLine = mainLineEnter.merge(mainLine).style("opacity", $$.initialOpacity.bind($$)).style('shape-rendering', function (d) {
      return $$.isStepType(d) ? 'crispEdges' : '';
    }).attr('transform', null);
    mainLine.exit().transition().duration(durationForExit).style('opacity', 0);
  };

  ChartInternal.prototype.redrawLine = function (drawLine, withTransition, transition) {
    return [(withTransition ? this.mainLine.transition(transition) : this.mainLine).attr("d", drawLine).style("stroke", this.color).style("opacity", 1)];
  };

  ChartInternal.prototype.generateDrawLine = function (lineIndices, isSub) {
    var $$ = this,
        config = $$.config,
        line = $$.d3.line(),
        getPoints = $$.generateGetLinePoints(lineIndices, isSub),
        yScaleGetter = isSub ? $$.getSubYScale : $$.getYScale,
        xValue = function xValue(d) {
      return (isSub ? $$.subxx : $$.xx).call($$, d);
    },
        yValue = function yValue(d, i) {
      return config.data_groups.length > 0 ? getPoints(d, i)[0][1] : yScaleGetter.call($$, d.id)(d.value);
    };

    line = config.axis_rotated ? line.x(yValue).y(xValue) : line.x(xValue).y(yValue);

    if (!config.line_connectNull) {
      line = line.defined(function (d) {
        return d.value != null;
      });
    }

    return function (d) {
      var values = config.line_connectNull ? $$.filterRemoveNull(d.values) : d.values,
          x = isSub ? $$.subX : $$.x,
          y = yScaleGetter.call($$, d.id),
          x0 = 0,
          y0 = 0,
          path;

      if ($$.isLineType(d)) {
        if (config.data_regions[d.id]) {
          path = $$.lineWithRegions(values, x, y, config.data_regions[d.id]);
        } else {
          if ($$.isStepType(d)) {
            values = $$.convertValuesToStep(values);
          }

          path = line.curve($$.getInterpolate(d))(values);
        }
      } else {
        if (values[0]) {
          x0 = x(values[0].x);
          y0 = y(values[0].value);
        }

        path = config.axis_rotated ? "M " + y0 + " " + x0 : "M " + x0 + " " + y0;
      }

      return path ? path : "M 0 0";
    };
  };

  ChartInternal.prototype.generateGetLinePoints = function (lineIndices, isSub) {
    // partial duplication of generateGetBarPoints
    var $$ = this,
        config = $$.config,
        lineTargetsNum = lineIndices.__max__ + 1,
        x = $$.getShapeX(0, lineTargetsNum, lineIndices, !!isSub),
        y = $$.getShapeY(!!isSub),
        lineOffset = $$.getShapeOffset($$.isLineType, lineIndices, !!isSub),
        yScale = isSub ? $$.getSubYScale : $$.getYScale;
    return function (d, i) {
      var y0 = yScale.call($$, d.id)(0),
          offset = lineOffset(d, i) || y0,
          // offset is for stacked area chart
      posX = x(d),
          posY = y(d); // fix posY not to overflow opposite quadrant

      if (config.axis_rotated) {
        if (0 < d.value && posY < y0 || d.value < 0 && y0 < posY) {
          posY = y0;
        }
      } // 1 point that marks the line position


      return [[posX, posY - (y0 - offset)], [posX, posY - (y0 - offset)], // needed for compatibility
      [posX, posY - (y0 - offset)], // needed for compatibility
      [posX, posY - (y0 - offset)] // needed for compatibility
      ];
    };
  };

  ChartInternal.prototype.lineWithRegions = function (d, x, y, _regions) {
    var $$ = this,
        config = $$.config,
        prev = -1,
        i,
        j,
        s = "M",
        sWithRegion,
        xp,
        yp,
        dx,
        dy,
        dd,
        diff,
        diffx2,
        xOffset = $$.isCategorized() ? 0.5 : 0,
        xValue,
        yValue,
        regions = [];

    function isWithinRegions(x, regions) {
      var i;

      for (i = 0; i < regions.length; i++) {
        if (regions[i].start < x && x <= regions[i].end) {
          return true;
        }
      }

      return false;
    } // Check start/end of regions


    if (isDefined(_regions)) {
      for (i = 0; i < _regions.length; i++) {
        regions[i] = {};

        if (isUndefined(_regions[i].start)) {
          regions[i].start = d[0].x;
        } else {
          regions[i].start = $$.isTimeSeries() ? $$.parseDate(_regions[i].start) : _regions[i].start;
        }

        if (isUndefined(_regions[i].end)) {
          regions[i].end = d[d.length - 1].x;
        } else {
          regions[i].end = $$.isTimeSeries() ? $$.parseDate(_regions[i].end) : _regions[i].end;
        }
      }
    } // Set scales


    xValue = config.axis_rotated ? function (d) {
      return y(d.value);
    } : function (d) {
      return x(d.x);
    };
    yValue = config.axis_rotated ? function (d) {
      return x(d.x);
    } : function (d) {
      return y(d.value);
    }; // Define svg generator function for region

    function generateM(points) {
      return 'M' + points[0][0] + ' ' + points[0][1] + ' ' + points[1][0] + ' ' + points[1][1];
    }

    if ($$.isTimeSeries()) {
      sWithRegion = function sWithRegion(d0, d1, j, diff) {
        var x0 = d0.x.getTime(),
            x_diff = d1.x - d0.x,
            xv0 = new Date(x0 + x_diff * j),
            xv1 = new Date(x0 + x_diff * (j + diff)),
            points;

        if (config.axis_rotated) {
          points = [[y(yp(j)), x(xv0)], [y(yp(j + diff)), x(xv1)]];
        } else {
          points = [[x(xv0), y(yp(j))], [x(xv1), y(yp(j + diff))]];
        }

        return generateM(points);
      };
    } else {
      sWithRegion = function sWithRegion(d0, d1, j, diff) {
        var points;

        if (config.axis_rotated) {
          points = [[y(yp(j), true), x(xp(j))], [y(yp(j + diff), true), x(xp(j + diff))]];
        } else {
          points = [[x(xp(j), true), y(yp(j))], [x(xp(j + diff), true), y(yp(j + diff))]];
        }

        return generateM(points);
      };
    } // Generate


    for (i = 0; i < d.length; i++) {
      // Draw as normal
      if (isUndefined(regions) || !isWithinRegions(d[i].x, regions)) {
        s += " " + xValue(d[i]) + " " + yValue(d[i]);
      } // Draw with region // TODO: Fix for horizotal charts
      else {
          xp = $$.getScale(d[i - 1].x + xOffset, d[i].x + xOffset, $$.isTimeSeries());
          yp = $$.getScale(d[i - 1].value, d[i].value);
          dx = x(d[i].x) - x(d[i - 1].x);
          dy = y(d[i].value) - y(d[i - 1].value);
          dd = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));
          diff = 2 / dd;
          diffx2 = diff * 2;

          for (j = diff; j <= 1; j += diffx2) {
            s += sWithRegion(d[i - 1], d[i], j, diff);
          }
        }

      prev = d[i].x;
    }

    return s;
  };

  ChartInternal.prototype.updateArea = function (durationForExit) {
    var $$ = this,
        d3 = $$.d3;
    var mainArea = $$.main.selectAll('.' + CLASS.areas).selectAll('.' + CLASS.area).data($$.lineData.bind($$));
    var mainAreaEnter = mainArea.enter().append('path').attr("class", $$.classArea.bind($$)).style("fill", $$.color).style("opacity", function () {
      $$.orgAreaOpacity = +d3.select(this).style('opacity');
      return 0;
    });
    $$.mainArea = mainAreaEnter.merge(mainArea).style("opacity", $$.orgAreaOpacity);
    mainArea.exit().transition().duration(durationForExit).style('opacity', 0);
  };

  ChartInternal.prototype.redrawArea = function (drawArea, withTransition, transition) {
    return [(withTransition ? this.mainArea.transition(transition) : this.mainArea).attr("d", drawArea).style("fill", this.color).style("opacity", this.orgAreaOpacity)];
  };

  ChartInternal.prototype.generateDrawArea = function (areaIndices, isSub) {
    var $$ = this,
        config = $$.config,
        area = $$.d3.area(),
        getPoints = $$.generateGetAreaPoints(areaIndices, isSub),
        yScaleGetter = isSub ? $$.getSubYScale : $$.getYScale,
        xValue = function xValue(d) {
      return (isSub ? $$.subxx : $$.xx).call($$, d);
    },
        value0 = function value0(d, i) {
      return config.data_groups.length > 0 ? getPoints(d, i)[0][1] : yScaleGetter.call($$, d.id)($$.getAreaBaseValue(d.id));
    },
        value1 = function value1(d, i) {
      return config.data_groups.length > 0 ? getPoints(d, i)[1][1] : yScaleGetter.call($$, d.id)(d.value);
    };

    area = config.axis_rotated ? area.x0(value0).x1(value1).y(xValue) : area.x(xValue).y0(config.area_above ? 0 : value0).y1(value1);

    if (!config.line_connectNull) {
      area = area.defined(function (d) {
        return d.value !== null;
      });
    }

    return function (d) {
      var values = config.line_connectNull ? $$.filterRemoveNull(d.values) : d.values,
          x0 = 0,
          y0 = 0,
          path;

      if ($$.isAreaType(d)) {
        if ($$.isStepType(d)) {
          values = $$.convertValuesToStep(values);
        }

        path = area.curve($$.getInterpolate(d))(values);
      } else {
        if (values[0]) {
          x0 = $$.x(values[0].x);
          y0 = $$.getYScale(d.id)(values[0].value);
        }

        path = config.axis_rotated ? "M " + y0 + " " + x0 : "M " + x0 + " " + y0;
      }

      return path ? path : "M 0 0";
    };
  };

  ChartInternal.prototype.getAreaBaseValue = function () {
    return 0;
  };

  ChartInternal.prototype.generateGetAreaPoints = function (areaIndices, isSub) {
    // partial duplication of generateGetBarPoints
    var $$ = this,
        config = $$.config,
        areaTargetsNum = areaIndices.__max__ + 1,
        x = $$.getShapeX(0, areaTargetsNum, areaIndices, !!isSub),
        y = $$.getShapeY(!!isSub),
        areaOffset = $$.getShapeOffset($$.isAreaType, areaIndices, !!isSub),
        yScale = isSub ? $$.getSubYScale : $$.getYScale;
    return function (d, i) {
      var y0 = yScale.call($$, d.id)(0),
          offset = areaOffset(d, i) || y0,
          // offset is for stacked area chart
      posX = x(d),
          posY = y(d); // fix posY not to overflow opposite quadrant

      if (config.axis_rotated) {
        if (0 < d.value && posY < y0 || d.value < 0 && y0 < posY) {
          posY = y0;
        }
      } // 1 point that marks the area position


      return [[posX, offset], [posX, posY - (y0 - offset)], [posX, posY - (y0 - offset)], // needed for compatibility
      [posX, offset] // needed for compatibility
      ];
    };
  };

  ChartInternal.prototype.updateCircle = function (cx, cy) {
    var $$ = this;
    var mainCircle = $$.main.selectAll('.' + CLASS.circles).selectAll('.' + CLASS.circle).data($$.lineOrScatterOrStanfordData.bind($$));
    var mainCircleEnter = mainCircle.enter().append("circle").attr('shape-rendering', $$.isStanfordGraphType() ? 'crispEdges' : '').attr("class", $$.classCircle.bind($$)).attr("cx", cx).attr("cy", cy).attr("r", $$.pointR.bind($$)).style("color", $$.isStanfordGraphType() ? $$.getStanfordPointColor.bind($$) : $$.color);
    $$.mainCircle = mainCircleEnter.merge(mainCircle).style("opacity", $$.isStanfordGraphType() ? 1 : $$.initialOpacityForCircle.bind($$));
    mainCircle.exit().style("opacity", 0);
  };

  ChartInternal.prototype.redrawCircle = function (cx, cy, withTransition, transition) {
    var $$ = this,
        selectedCircles = $$.main.selectAll('.' + CLASS.selectedCircle);
    return [(withTransition ? $$.mainCircle.transition(transition) : $$.mainCircle).style('opacity', this.opacityForCircle.bind($$)).style("color", $$.isStanfordGraphType() ? $$.getStanfordPointColor.bind($$) : $$.color).attr("cx", cx).attr("cy", cy), (withTransition ? selectedCircles.transition(transition) : selectedCircles).attr("cx", cx).attr("cy", cy)];
  };

  ChartInternal.prototype.circleX = function (d) {
    return d.x || d.x === 0 ? this.x(d.x) : null;
  };

  ChartInternal.prototype.updateCircleY = function () {
    var $$ = this,
        lineIndices,
        getPoints;

    if ($$.config.data_groups.length > 0) {
      lineIndices = $$.getShapeIndices($$.isLineType), getPoints = $$.generateGetLinePoints(lineIndices);

      $$.circleY = function (d, i) {
        return getPoints(d, i)[0][1];
      };
    } else {
      $$.circleY = function (d) {
        return $$.getYScale(d.id)(d.value);
      };
    }
  };

  ChartInternal.prototype.getCircles = function (i, id) {
    var $$ = this;
    return (id ? $$.main.selectAll('.' + CLASS.circles + $$.getTargetSelectorSuffix(id)) : $$.main).selectAll('.' + CLASS.circle + (isValue(i) ? '-' + i : ''));
  };

  ChartInternal.prototype.expandCircles = function (i, id, reset) {
    var $$ = this,
        r = $$.pointExpandedR.bind($$);

    if (reset) {
      $$.unexpandCircles();
    }

    $$.getCircles(i, id).classed(CLASS.EXPANDED, true).attr('r', r);
  };

  ChartInternal.prototype.unexpandCircles = function (i) {
    var $$ = this,
        r = $$.pointR.bind($$);
    $$.getCircles(i).filter(function () {
      return $$.d3.select(this).classed(CLASS.EXPANDED);
    }).classed(CLASS.EXPANDED, false).attr('r', r);
  };

  ChartInternal.prototype.pointR = function (d) {
    var $$ = this,
        config = $$.config;
    return $$.isStepType(d) ? 0 : isFunction(config.point_r) ? config.point_r(d) : config.point_r;
  };

  ChartInternal.prototype.pointExpandedR = function (d) {
    var $$ = this,
        config = $$.config;

    if (config.point_focus_expand_enabled) {
      return isFunction(config.point_focus_expand_r) ? config.point_focus_expand_r(d) : config.point_focus_expand_r ? config.point_focus_expand_r : $$.pointR(d) * 1.75;
    } else {
      return $$.pointR(d);
    }
  };

  ChartInternal.prototype.pointSelectR = function (d) {
    var $$ = this,
        config = $$.config;
    return isFunction(config.point_select_r) ? config.point_select_r(d) : config.point_select_r ? config.point_select_r : $$.pointR(d) * 4;
  };

  ChartInternal.prototype.isWithinCircle = function (that, r) {
    var d3 = this.d3,
        mouse = d3.mouse(that),
        d3_this = d3.select(that),
        cx = +d3_this.attr("cx"),
        cy = +d3_this.attr("cy");
    return Math.sqrt(Math.pow(cx - mouse[0], 2) + Math.pow(cy - mouse[1], 2)) < r;
  };

  ChartInternal.prototype.isWithinStep = function (that, y) {
    return Math.abs(y - this.d3.mouse(that)[1]) < 30;
  };

  ChartInternal.prototype.getCurrentWidth = function () {
    var $$ = this,
        config = $$.config;
    return config.size_width ? config.size_width : $$.getParentWidth();
  };

  ChartInternal.prototype.getCurrentHeight = function () {
    var $$ = this,
        config = $$.config,
        h = config.size_height ? config.size_height : $$.getParentHeight();
    return h > 0 ? h : 320 / ($$.hasType('gauge') && !config.gauge_fullCircle ? 2 : 1);
  };

  ChartInternal.prototype.getCurrentPaddingTop = function () {
    var $$ = this,
        config = $$.config,
        padding = isValue(config.padding_top) ? config.padding_top : 0;

    if ($$.title && $$.title.node()) {
      padding += $$.getTitlePadding();
    }

    return padding;
  };

  ChartInternal.prototype.getCurrentPaddingBottom = function () {
    var config = this.config;
    return isValue(config.padding_bottom) ? config.padding_bottom : 0;
  };

  ChartInternal.prototype.getCurrentPaddingLeft = function (withoutRecompute) {
    var $$ = this,
        config = $$.config;

    if (isValue(config.padding_left)) {
      return config.padding_left;
    } else if (config.axis_rotated) {
      return !config.axis_x_show || config.axis_x_inner ? 1 : Math.max(ceil10($$.getAxisWidthByAxisId('x', withoutRecompute)), 40);
    } else if (!config.axis_y_show || config.axis_y_inner) {
      // && !config.axis_rotated
      return $$.axis.getYAxisLabelPosition().isOuter ? 30 : 1;
    } else {
      return ceil10($$.getAxisWidthByAxisId('y', withoutRecompute));
    }
  };

  ChartInternal.prototype.getCurrentPaddingRight = function () {
    var $$ = this,
        config = $$.config,
        padding = 0,
        defaultPadding = 10,
        legendWidthOnRight = $$.isLegendRight ? $$.getLegendWidth() + 20 : 0;

    if (isValue(config.padding_right)) {
      padding = config.padding_right + 1; // 1 is needed not to hide tick line
    } else if (config.axis_rotated) {
      padding = defaultPadding + legendWidthOnRight;
    } else if (!config.axis_y2_show || config.axis_y2_inner) {
      // && !config.axis_rotated
      padding = 2 + legendWidthOnRight + ($$.axis.getY2AxisLabelPosition().isOuter ? 20 : 0);
    } else {
      padding = ceil10($$.getAxisWidthByAxisId('y2')) + legendWidthOnRight;
    }

    if ($$.colorScale && $$.colorScale.node()) {
      padding += $$.getColorScalePadding();
    }

    return padding;
  };

  ChartInternal.prototype.getParentRectValue = function (key) {
    var parent = this.selectChart.node(),
        v;

    while (parent && parent.tagName !== 'BODY') {
      try {
        v = parent.getBoundingClientRect()[key];
      } catch (e) {
        if (key === 'width') {
          // In IE in certain cases getBoundingClientRect
          // will cause an "unspecified error"
          v = parent.offsetWidth;
        }
      }

      if (v) {
        break;
      }

      parent = parent.parentNode;
    }

    return v;
  };

  ChartInternal.prototype.getParentWidth = function () {
    return this.getParentRectValue('width');
  };

  ChartInternal.prototype.getParentHeight = function () {
    var h = this.selectChart.style('height');
    return h.indexOf('px') > 0 ? +h.replace('px', '') : 0;
  };

  ChartInternal.prototype.getSvgLeft = function (withoutRecompute) {
    var $$ = this,
        config = $$.config,
        hasLeftAxisRect = config.axis_rotated || !config.axis_rotated && !config.axis_y_inner,
        leftAxisClass = config.axis_rotated ? CLASS.axisX : CLASS.axisY,
        leftAxis = $$.main.select('.' + leftAxisClass).node(),
        svgRect = leftAxis && hasLeftAxisRect ? leftAxis.getBoundingClientRect() : {
      right: 0
    },
        chartRect = $$.selectChart.node().getBoundingClientRect(),
        hasArc = $$.hasArcType(),
        svgLeft = svgRect.right - chartRect.left - (hasArc ? 0 : $$.getCurrentPaddingLeft(withoutRecompute));
    return svgLeft > 0 ? svgLeft : 0;
  };

  ChartInternal.prototype.getAxisWidthByAxisId = function (id, withoutRecompute) {
    var $$ = this,
        position = $$.axis.getLabelPositionById(id);
    return $$.axis.getMaxTickWidth(id, withoutRecompute) + (position.isInner ? 20 : 40);
  };

  ChartInternal.prototype.getHorizontalAxisHeight = function (axisId) {
    var $$ = this,
        config = $$.config,
        h = 30;

    if (axisId === 'x' && !config.axis_x_show) {
      return 8;
    }

    if (axisId === 'x' && config.axis_x_height) {
      return config.axis_x_height;
    }

    if (axisId === 'y' && !config.axis_y_show) {
      return config.legend_show && !$$.isLegendRight && !$$.isLegendInset ? 10 : 1;
    }

    if (axisId === 'y2' && !config.axis_y2_show) {
      return $$.rotated_padding_top;
    } // Calculate x axis height when tick rotated


    if (axisId === 'x' && !config.axis_rotated && config.axis_x_tick_rotate) {
      h = 30 + $$.axis.getMaxTickWidth(axisId) * Math.cos(Math.PI * (90 - Math.abs(config.axis_x_tick_rotate)) / 180);
    } // Calculate y axis height when tick rotated


    if (axisId === 'y' && config.axis_rotated && config.axis_y_tick_rotate) {
      h = 30 + $$.axis.getMaxTickWidth(axisId) * Math.cos(Math.PI * (90 - Math.abs(config.axis_y_tick_rotate)) / 180);
    }

    return h + ($$.axis.getLabelPositionById(axisId).isInner ? 0 : 10) + (axisId === 'y2' ? -10 : 0);
  };

  ChartInternal.prototype.initBrush = function (scale) {
    var $$ = this,
        d3 = $$.d3; // TODO: dynamically change brushY/brushX according to axis_rotated.

    $$.brush = ($$.config.axis_rotated ? d3.brushY() : d3.brushX()).on("brush", function () {
      var event = d3.event.sourceEvent;

      if (event && event.type === "zoom") {
        return;
      }

      $$.redrawForBrush();
    }).on("end", function () {
      var event = d3.event.sourceEvent;

      if (event && event.type === "zoom") {
        return;
      }

      if ($$.brush.empty() && event && event.type !== 'end') {
        $$.brush.clear();
      }
    });

    $$.brush.updateExtent = function () {
      var range = this.scale.range(),
          extent;

      if ($$.config.axis_rotated) {
        extent = [[0, range[0]], [$$.width2, range[1]]];
      } else {
        extent = [[range[0], 0], [range[1], $$.height2]];
      }

      this.extent(extent);
      return this;
    };

    $$.brush.updateScale = function (scale) {
      this.scale = scale;
      return this;
    };

    $$.brush.update = function (scale) {
      this.updateScale(scale || $$.subX).updateExtent();
      $$.context.select('.' + CLASS.brush).call(this);
    };

    $$.brush.clear = function () {
      $$.context.select('.' + CLASS.brush).call($$.brush.move, null);
    };

    $$.brush.selection = function () {
      return d3.brushSelection($$.context.select('.' + CLASS.brush).node());
    };

    $$.brush.selectionAsValue = function (selectionAsValue, withTransition) {
      var selection, brush;

      if (selectionAsValue) {
        if ($$.context) {
          selection = [this.scale(selectionAsValue[0]), this.scale(selectionAsValue[1])];
          brush = $$.context.select('.' + CLASS.brush);

          if (withTransition) {
            brush = brush.transition();
          }

          $$.brush.move(brush, selection);
        }

        return [];
      }

      selection = $$.brush.selection() || [0, 0];
      return [this.scale.invert(selection[0]), this.scale.invert(selection[1])];
    };

    $$.brush.empty = function () {
      var selection = $$.brush.selection();
      return !selection || selection[0] === selection[1];
    };

    return $$.brush.updateScale(scale);
  };

  ChartInternal.prototype.initSubchart = function () {
    var $$ = this,
        config = $$.config,
        context = $$.context = $$.svg.append("g").attr("transform", $$.getTranslate('context')); // set style

    context.style('visibility', 'visible'); // Define g for chart area

    context.append('g').attr("clip-path", $$.clipPathForSubchart).attr('class', CLASS.chart); // Define g for bar chart area

    context.select('.' + CLASS.chart).append("g").attr("class", CLASS.chartBars); // Define g for line chart area

    context.select('.' + CLASS.chart).append("g").attr("class", CLASS.chartLines); // Add extent rect for Brush

    context.append("g").attr("clip-path", $$.clipPath).attr("class", CLASS.brush); // ATTENTION: This must be called AFTER chart added
    // Add Axis

    $$.axes.subx = context.append("g").attr("class", CLASS.axisX).attr("transform", $$.getTranslate('subx')).attr("clip-path", config.axis_rotated ? "" : $$.clipPathForXAxis);
  };

  ChartInternal.prototype.initSubchartBrush = function () {
    var $$ = this; // Add extent rect for Brush

    $$.initBrush($$.subX).updateExtent();
    $$.context.select('.' + CLASS.brush).call($$.brush);
  };

  ChartInternal.prototype.updateTargetsForSubchart = function (targets) {
    var $$ = this,
        context = $$.context,
        config = $$.config,
        contextLineEnter,
        contextLine,
        contextBarEnter,
        contextBar,
        classChartBar = $$.classChartBar.bind($$),
        classBars = $$.classBars.bind($$),
        classChartLine = $$.classChartLine.bind($$),
        classLines = $$.classLines.bind($$),
        classAreas = $$.classAreas.bind($$); //-- Bar --//

    contextBar = context.select('.' + CLASS.chartBars).selectAll('.' + CLASS.chartBar).data(targets);
    contextBarEnter = contextBar.enter().append('g').style('opacity', 0);
    contextBarEnter.merge(contextBar).attr('class', classChartBar); // Bars for each data

    contextBarEnter.append('g').attr("class", classBars); //-- Line --//

    contextLine = context.select('.' + CLASS.chartLines).selectAll('.' + CLASS.chartLine).data(targets);
    contextLineEnter = contextLine.enter().append('g').style('opacity', 0);
    contextLineEnter.merge(contextLine).attr('class', classChartLine); // Lines for each data

    contextLineEnter.append("g").attr("class", classLines); // Area

    contextLineEnter.append("g").attr("class", classAreas); //-- Brush --//

    context.selectAll('.' + CLASS.brush + ' rect').attr(config.axis_rotated ? "width" : "height", config.axis_rotated ? $$.width2 : $$.height2);
  };

  ChartInternal.prototype.updateBarForSubchart = function (durationForExit) {
    var $$ = this;
    var contextBar = $$.context.selectAll('.' + CLASS.bars).selectAll('.' + CLASS.bar).data($$.barData.bind($$));
    var contextBarEnter = contextBar.enter().append('path').attr("class", $$.classBar.bind($$)).style("stroke", 'none').style("fill", $$.color);
    contextBar.exit().transition().duration(durationForExit).style('opacity', 0).remove();
    $$.contextBar = contextBarEnter.merge(contextBar).style("opacity", $$.initialOpacity.bind($$));
  };

  ChartInternal.prototype.redrawBarForSubchart = function (drawBarOnSub, withTransition, duration) {
    (withTransition ? this.contextBar.transition(Math.random().toString()).duration(duration) : this.contextBar).attr('d', drawBarOnSub).style('opacity', 1);
  };

  ChartInternal.prototype.updateLineForSubchart = function (durationForExit) {
    var $$ = this;
    var contextLine = $$.context.selectAll('.' + CLASS.lines).selectAll('.' + CLASS.line).data($$.lineData.bind($$));
    var contextLineEnter = contextLine.enter().append('path').attr('class', $$.classLine.bind($$)).style('stroke', $$.color);
    contextLine.exit().transition().duration(durationForExit).style('opacity', 0).remove();
    $$.contextLine = contextLineEnter.merge(contextLine).style("opacity", $$.initialOpacity.bind($$));
  };

  ChartInternal.prototype.redrawLineForSubchart = function (drawLineOnSub, withTransition, duration) {
    (withTransition ? this.contextLine.transition(Math.random().toString()).duration(duration) : this.contextLine).attr("d", drawLineOnSub).style('opacity', 1);
  };

  ChartInternal.prototype.updateAreaForSubchart = function (durationForExit) {
    var $$ = this,
        d3 = $$.d3;
    var contextArea = $$.context.selectAll('.' + CLASS.areas).selectAll('.' + CLASS.area).data($$.lineData.bind($$));
    var contextAreaEnter = contextArea.enter().append('path').attr("class", $$.classArea.bind($$)).style("fill", $$.color).style("opacity", function () {
      $$.orgAreaOpacity = +d3.select(this).style('opacity');
      return 0;
    });
    contextArea.exit().transition().duration(durationForExit).style('opacity', 0).remove();
    $$.contextArea = contextAreaEnter.merge(contextArea).style("opacity", 0);
  };

  ChartInternal.prototype.redrawAreaForSubchart = function (drawAreaOnSub, withTransition, duration) {
    (withTransition ? this.contextArea.transition(Math.random().toString()).duration(duration) : this.contextArea).attr("d", drawAreaOnSub).style("fill", this.color).style("opacity", this.orgAreaOpacity);
  };

  ChartInternal.prototype.redrawSubchart = function (withSubchart, transitions, duration, durationForExit, areaIndices, barIndices, lineIndices) {
    var $$ = this,
        d3 = $$.d3,
        drawAreaOnSub,
        drawBarOnSub,
        drawLineOnSub; // reflect main chart to extent on subchart if zoomed

    if (d3.event && d3.event.type === 'zoom') {
      $$.brush.selectionAsValue($$.x.orgDomain());
    } // update subchart elements if needed


    if (withSubchart) {
      // extent rect
      if (!$$.brush.empty()) {
        $$.brush.selectionAsValue($$.x.orgDomain());
      } // setup drawer - MEMO: this must be called after axis updated


      drawAreaOnSub = $$.generateDrawArea(areaIndices, true);
      drawBarOnSub = $$.generateDrawBar(barIndices, true);
      drawLineOnSub = $$.generateDrawLine(lineIndices, true);
      $$.updateBarForSubchart(duration);
      $$.updateLineForSubchart(duration);
      $$.updateAreaForSubchart(duration);
      $$.redrawBarForSubchart(drawBarOnSub, duration, duration);
      $$.redrawLineForSubchart(drawLineOnSub, duration, duration);
      $$.redrawAreaForSubchart(drawAreaOnSub, duration, duration);
    }
  };

  ChartInternal.prototype.redrawForBrush = function () {
    var $$ = this,
        x = $$.x,
        d3 = $$.d3,
        s;
    $$.redraw({
      withTransition: false,
      withY: $$.config.zoom_rescale,
      withSubchart: false,
      withUpdateXDomain: true,
      withEventRect: false,
      withDimension: false
    }); // update zoom transation binded to event rect

    s = d3.event.selection || $$.brush.scale.range();
    $$.main.select('.' + CLASS.eventRect).call($$.zoom.transform, d3.zoomIdentity.scale($$.width / (s[1] - s[0])).translate(-s[0], 0));
    $$.config.subchart_onbrush.call($$.api, x.orgDomain());
  };

  ChartInternal.prototype.transformContext = function (withTransition, transitions) {
    var $$ = this,
        subXAxis;

    if (transitions && transitions.axisSubX) {
      subXAxis = transitions.axisSubX;
    } else {
      subXAxis = $$.context.select('.' + CLASS.axisX);

      if (withTransition) {
        subXAxis = subXAxis.transition();
      }
    }

    $$.context.attr("transform", $$.getTranslate('context'));
    subXAxis.attr("transform", $$.getTranslate('subx'));
  };

  ChartInternal.prototype.getDefaultSelection = function () {
    var $$ = this,
        config = $$.config,
        selection = isFunction(config.axis_x_selection) ? config.axis_x_selection($$.getXDomain($$.data.targets)) : config.axis_x_selection;

    if ($$.isTimeSeries()) {
      selection = [$$.parseDate(selection[0]), $$.parseDate(selection[1])];
    }

    return selection;
  };

  ChartInternal.prototype.removeSubchart = function () {
    var $$ = this;
    $$.brush = null;
    $$.context.remove();
    $$.context = null;
  };

  ChartInternal.prototype.initText = function () {
    var $$ = this;
    $$.main.select('.' + CLASS.chart).append("g").attr("class", CLASS.chartTexts);
    $$.mainText = $$.d3.selectAll([]);
  };

  ChartInternal.prototype.updateTargetsForText = function (targets) {
    var $$ = this,
        classChartText = $$.classChartText.bind($$),
        classTexts = $$.classTexts.bind($$),
        classFocus = $$.classFocus.bind($$);
    var mainText = $$.main.select('.' + CLASS.chartTexts).selectAll('.' + CLASS.chartText).data(targets);
    var mainTextEnter = mainText.enter().append('g').attr('class', classChartText).style('opacity', 0).style("pointer-events", "none");
    mainTextEnter.append('g').attr('class', classTexts);
    mainTextEnter.merge(mainText).attr('class', function (d) {
      return classChartText(d) + classFocus(d);
    });
  };

  ChartInternal.prototype.updateText = function (xForText, yForText, durationForExit) {
    var $$ = this,
        config = $$.config,
        barOrLineData = $$.barOrLineData.bind($$),
        classText = $$.classText.bind($$);
    var mainText = $$.main.selectAll('.' + CLASS.texts).selectAll('.' + CLASS.text).data(barOrLineData);
    var mainTextEnter = mainText.enter().append('text').attr("class", classText).attr('text-anchor', function (d) {
      return config.axis_rotated ? d.value < 0 ? 'end' : 'start' : 'middle';
    }).style("stroke", 'none').attr('x', xForText).attr('y', yForText).style("fill", function (d) {
      return $$.color(d);
    }).style("fill-opacity", 0);
    $$.mainText = mainTextEnter.merge(mainText).text(function (d, i, j) {
      return $$.dataLabelFormat(d.id)(d.value, d.id, i, j);
    });
    mainText.exit().transition().duration(durationForExit).style('fill-opacity', 0).remove();
  };

  ChartInternal.prototype.redrawText = function (xForText, yForText, forFlow, withTransition, transition) {
    return [(withTransition ? this.mainText.transition(transition) : this.mainText).attr('x', xForText).attr('y', yForText).style("fill", this.color).style("fill-opacity", forFlow ? 0 : this.opacityForText.bind(this))];
  };

  ChartInternal.prototype.getTextRect = function (text, cls, element) {
    var dummy = this.d3.select('body').append('div').classed('c3', true),
        svg = dummy.append("svg").style('visibility', 'hidden').style('position', 'fixed').style('top', 0).style('left', 0),
        font = this.d3.select(element).style('font'),
        rect;
    svg.selectAll('.dummy').data([text]).enter().append('text').classed(cls ? cls : "", true).style('font', font).text(text).each(function () {
      rect = getBBox(this);
    });
    dummy.remove();
    return rect;
  };

  ChartInternal.prototype.generateXYForText = function (areaIndices, barIndices, lineIndices, forX) {
    var $$ = this,
        getAreaPoints = $$.generateGetAreaPoints(areaIndices, false),
        getBarPoints = $$.generateGetBarPoints(barIndices, false),
        getLinePoints = $$.generateGetLinePoints(lineIndices, false),
        getter = forX ? $$.getXForText : $$.getYForText;
    return function (d, i) {
      var getPoints = $$.isAreaType(d) ? getAreaPoints : $$.isBarType(d) ? getBarPoints : getLinePoints;
      return getter.call($$, getPoints(d, i), d, this);
    };
  };

  ChartInternal.prototype.getXForText = function (points, d, textElement) {
    var $$ = this,
        box = getBBox(textElement),
        xPos,
        padding;

    if ($$.config.axis_rotated) {
      padding = $$.isBarType(d) ? 4 : 6;
      xPos = points[2][1] + padding * (d.value < 0 ? -1 : 1);
    } else {
      xPos = $$.hasType('bar') ? (points[2][0] + points[0][0]) / 2 : points[0][0];
    } // show labels regardless of the domain if value is null


    if (d.value === null) {
      if (xPos > $$.width) {
        xPos = $$.width - box.width;
      } else if (xPos < 0) {
        xPos = 4;
      }
    }

    return xPos;
  };

  ChartInternal.prototype.getYForText = function (points, d, textElement) {
    var $$ = this,
        box = getBBox(textElement),
        yPos;

    if ($$.config.axis_rotated) {
      yPos = (points[0][0] + points[2][0] + box.height * 0.6) / 2;
    } else {
      yPos = points[2][1];

      if (d.value < 0 || d.value === 0 && !$$.hasPositiveValue) {
        yPos += box.height;

        if ($$.isBarType(d) && $$.isSafari()) {
          yPos -= 3;
        } else if (!$$.isBarType(d) && $$.isChrome()) {
          yPos += 3;
        }
      } else {
        yPos += $$.isBarType(d) ? -3 : -6;
      }
    } // show labels regardless of the domain if value is null


    if (d.value === null && !$$.config.axis_rotated) {
      if (yPos < box.height) {
        yPos = box.height;
      } else if (yPos > this.height) {
        yPos = this.height - 4;
      }
    }

    return yPos;
  };

  ChartInternal.prototype.initTitle = function () {
    var $$ = this;
    $$.title = $$.svg.append("text").text($$.config.title_text).attr("class", $$.CLASS.title);
  };

  ChartInternal.prototype.redrawTitle = function () {
    var $$ = this;
    $$.title.attr("x", $$.xForTitle.bind($$)).attr("y", $$.yForTitle.bind($$));
  };

  ChartInternal.prototype.xForTitle = function () {
    var $$ = this,
        config = $$.config,
        position = config.title_position || 'left',
        x;

    if (position.indexOf('right') >= 0) {
      x = $$.currentWidth - $$.getTextRect($$.title.node().textContent, $$.CLASS.title, $$.title.node()).width - config.title_padding.right;
    } else if (position.indexOf('center') >= 0) {
      x = Math.max(($$.currentWidth - $$.getTextRect($$.title.node().textContent, $$.CLASS.title, $$.title.node()).width) / 2, 0);
    } else {
      // left
      x = config.title_padding.left;
    }

    return x;
  };

  ChartInternal.prototype.yForTitle = function () {
    var $$ = this;
    return $$.config.title_padding.top + $$.getTextRect($$.title.node().textContent, $$.CLASS.title, $$.title.node()).height;
  };

  ChartInternal.prototype.getTitlePadding = function () {
    var $$ = this;
    return $$.yForTitle() + $$.config.title_padding.bottom;
  };

  function powerOfTen(d) {
    return d / Math.pow(10, Math.ceil(Math.log(d) / Math.LN10 - 1e-12)) === 1;
  }

  ChartInternal.prototype.drawColorScale = function () {
    var $$ = this,
        d3 = $$.d3,
        config = $$.config,
        target = $$.data.targets[0],
        barWidth,
        barHeight,
        axis,
        points,
        legendAxis,
        axisScale,
        inverseScale,
        height;
    barWidth = !isNaN(config.stanford_scaleWidth) ? config.stanford_scaleWidth : 20;
    barHeight = 5;

    if (barHeight < 0 || barWidth < 0) {
      throw Error("Colorscale's barheight and barwidth must be greater than 0.");
    }

    height = $$.height - config.stanford_padding.bottom - config.stanford_padding.top;
    points = d3.range(config.stanford_padding.bottom, height, barHeight);
    inverseScale = d3.scaleSequential(target.colors).domain([points[points.length - 1], points[0]]);

    if ($$.colorScale) {
      $$.colorScale.remove();
    }

    $$.colorScale = $$.svg.append("g").attr('width', 50).attr('height', height).attr('class', CLASS.colorScale);
    $$.colorScale.append('g').attr('transform', "translate(0, ".concat(config.stanford_padding.top, ")")).selectAll('bars').data(points).enter().append('rect').attr('y', function (d, i) {
      return i * barHeight;
    }).attr('x', 0).attr('width', barWidth).attr('height', barHeight).attr('fill', function (d) {
      return inverseScale(d);
    }); // Legend Axis

    axisScale = d3.scaleLog().domain([target.minEpochs, target.maxEpochs]).range([points[0] + config.stanford_padding.top + points[points.length - 1] + barHeight - 1, points[0] + config.stanford_padding.top]);
    legendAxis = d3.axisRight(axisScale);

    if (config.stanford_scaleFormat === 'pow10') {
      legendAxis.tickValues([1, 10, 100, 1000, 10000, 100000, 1000000, 10000000]);
    } else if (isFunction(config.stanford_scaleFormat)) {
      legendAxis.tickFormat(config.stanford_scaleFormat);
    } else {
      legendAxis.tickFormat(d3.format("d"));
    }

    if (isFunction(config.stanford_scaleValues)) {
      legendAxis.tickValues(config.stanford_scaleValues(target.minEpochs, target.maxEpochs));
    } // Draw Axis


    axis = $$.colorScale.append("g").attr("class", "legend axis").attr("transform", "translate(".concat(barWidth, ",0)")).call(legendAxis);

    if (config.stanford_scaleFormat === 'pow10') {
      axis.selectAll(".tick text").text(null).filter(powerOfTen).text(10).append("tspan").attr("dy", "-.7em") // https://bl.ocks.org/mbostock/6738229
      .text(function (d) {
        return Math.round(Math.log(d) / Math.LN10);
      });
    }

    $$.colorScale.attr('transform', "translate(".concat($$.currentWidth - $$.xForColorScale(), ", 0)"));
  };

  ChartInternal.prototype.xForColorScale = function () {
    var $$ = this;
    return $$.config.stanford_padding.right + getBBox($$.colorScale.node()).width;
  };

  ChartInternal.prototype.getColorScalePadding = function () {
    var $$ = this;
    return $$.xForColorScale() + $$.config.stanford_padding.left + 20;
  };

  ChartInternal.prototype.isStanfordGraphType = function () {
    var $$ = this;
    return $$.config.data_type === 'stanford';
  };

  ChartInternal.prototype.initStanfordData = function () {
    var $$ = this,
        d3 = $$.d3,
        config = $$.config,
        target = $$.data.targets[0],
        epochs,
        maxEpochs,
        minEpochs; // Make larger values appear on top

    target.values.sort(compareEpochs); // Get array of epochs

    epochs = target.values.map(function (a) {
      return a.epochs;
    });
    minEpochs = !isNaN(config.stanford_scaleMin) ? config.stanford_scaleMin : d3.min(epochs);
    maxEpochs = !isNaN(config.stanford_scaleMax) ? config.stanford_scaleMax : d3.max(epochs);

    if (minEpochs > maxEpochs) {
      throw Error("Number of minEpochs has to be smaller than maxEpochs");
    }

    target.colors = isFunction(config.stanford_colors) ? config.stanford_colors : d3.interpolateHslLong(d3.hsl(250, 1, 0.5), d3.hsl(0, 1, 0.5));
    target.colorscale = d3.scaleSequentialLog(target.colors).domain([minEpochs, maxEpochs]);
    target.minEpochs = minEpochs;
    target.maxEpochs = maxEpochs;
  };

  ChartInternal.prototype.getStanfordPointColor = function (d) {
    var $$ = this,
        target = $$.data.targets[0];
    return target.colorscale(d.epochs);
  }; // http://jsfiddle.net/Xotic750/KtzLq/


  ChartInternal.prototype.getCentroid = function (points) {
    var area = getRegionArea(points);
    var x = 0,
        y = 0,
        i,
        j,
        f,
        point1,
        point2;

    for (i = 0, j = points.length - 1; i < points.length; j = i, i += 1) {
      point1 = points[i];
      point2 = points[j];
      f = point1.x * point2.y - point2.x * point1.y;
      x += (point1.x + point2.x) * f;
      y += (point1.y + point2.y) * f;
    }

    f = area * 6;
    return {
      x: x / f,
      y: y / f
    };
  };

  ChartInternal.prototype.getStanfordTooltipTitle = function (d) {
    var $$ = this,
        labelX = $$.axis.getLabelText('x'),
        labelY = $$.axis.getLabelText('y');
    return "\n      <tr><th>".concat(labelX ? sanitise(labelX) : "x", "</th><th class='value'>").concat(d.x, "</th></tr>\n      <tr><th>").concat(labelY ? sanitise(labelY) : "y", "</th><th class='value'>").concat(d.value, "</th></tr>\n    ");
  };

  ChartInternal.prototype.countEpochsInRegion = function (region) {
    var $$ = this,
        target = $$.data.targets[0],
        total,
        count;
    total = target.values.reduce(function (accumulator, currentValue) {
      return accumulator + Number(currentValue.epochs);
    }, 0);
    count = target.values.reduce(function (accumulator, currentValue) {
      if (pointInRegion(currentValue, region)) {
        return accumulator + Number(currentValue.epochs);
      }

      return accumulator;
    }, 0);
    return {
      value: count,
      percentage: count !== 0 ? (count / total * 100).toFixed(1) : 0
    };
  };

  var getRegionArea = function getRegionArea(points) {
    // thanks to: https://stackoverflow.com/questions/16282330/find-centerpoint-of-polygon-in-javascript
    var area = 0,
        i,
        j,
        point1,
        point2;

    for (i = 0, j = points.length - 1; i < points.length; j = i, i += 1) {
      point1 = points[i];
      point2 = points[j];
      area += point1.x * point2.y;
      area -= point1.y * point2.x;
    }

    area /= 2;
    return area;
  };
  var pointInRegion = function pointInRegion(point, region) {
    // thanks to: http://bl.ocks.org/bycoffe/5575904
    // ray-casting algorithm based on
    // http://www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/pnpoly.html
    var xi,
        yi,
        yj,
        xj,
        intersect,
        x = point.x,
        y = point.value,
        inside = false;

    for (var i = 0, j = region.length - 1; i < region.length; j = i++) {
      xi = region[i].x;
      yi = region[i].y;
      xj = region[j].x;
      yj = region[j].y;
      intersect = yi > y !== yj > y && x < (xj - xi) * (y - yi) / (yj - yi) + xi;

      if (intersect) {
        inside = !inside;
      }
    }

    return inside;
  };
  var compareEpochs = function compareEpochs(a, b) {
    if (a.epochs < b.epochs) {
      return -1;
    }

    if (a.epochs > b.epochs) {
      return 1;
    }

    return 0;
  };

  ChartInternal.prototype.initStanfordElements = function () {
    var $$ = this; // Avoid blocking eventRect

    $$.stanfordElements = $$.main.select('.' + CLASS.chart).append('g').attr('class', CLASS.stanfordElements);
    $$.stanfordElements.append('g').attr('class', CLASS.stanfordLines);
    $$.stanfordElements.append('g').attr('class', CLASS.stanfordTexts);
    $$.stanfordElements.append('g').attr('class', CLASS.stanfordRegions);
  };

  ChartInternal.prototype.updateStanfordElements = function (duration) {
    var $$ = this,
        main = $$.main,
        config = $$.config,
        stanfordLine,
        stanfordLineEnter,
        stanfordRegion,
        stanfordRegionEnter,
        stanfordText,
        stanfordTextEnter,
        xvCustom = $$.xvCustom.bind($$),
        yvCustom = $$.yvCustom.bind($$),
        countPointsInRegion = $$.countEpochsInRegion.bind($$); // Stanford-Lines

    stanfordLine = main.select('.' + CLASS.stanfordLines).style('shape-rendering', 'geometricprecision').selectAll('.' + CLASS.stanfordLine).data(config.stanford_lines); // enter

    stanfordLineEnter = stanfordLine.enter().append('g').attr("class", function (d) {
      return CLASS.stanfordLine + (d['class'] ? ' ' + d['class'] : '');
    });
    stanfordLineEnter.append('line').attr("x1", function (d) {
      return config.axis_rotated ? yvCustom(d, 'value_y1') : xvCustom(d, 'value_x1');
    }).attr("x2", function (d) {
      return config.axis_rotated ? yvCustom(d, 'value_y2') : xvCustom(d, 'value_x2');
    }).attr("y1", function (d) {
      return config.axis_rotated ? xvCustom(d, 'value_x1') : yvCustom(d, 'value_y1');
    }).attr("y2", function (d) {
      return config.axis_rotated ? xvCustom(d, 'value_x2') : yvCustom(d, 'value_y2');
    }).style("opacity", 0); // update

    $$.stanfordLines = stanfordLineEnter.merge(stanfordLine);
    $$.stanfordLines.select('line').transition().duration(duration).attr("x1", function (d) {
      return config.axis_rotated ? yvCustom(d, 'value_y1') : xvCustom(d, 'value_x1');
    }).attr("x2", function (d) {
      return config.axis_rotated ? yvCustom(d, 'value_y2') : xvCustom(d, 'value_x2');
    }).attr("y1", function (d) {
      return config.axis_rotated ? xvCustom(d, 'value_x1') : yvCustom(d, 'value_y1');
    }).attr("y2", function (d) {
      return config.axis_rotated ? xvCustom(d, 'value_x2') : yvCustom(d, 'value_y2');
    }).style("opacity", 1); // exit

    stanfordLine.exit().transition().duration(duration).style("opacity", 0).remove(); // Stanford-Text

    stanfordText = main.select('.' + CLASS.stanfordTexts).selectAll('.' + CLASS.stanfordText).data(config.stanford_texts); // enter

    stanfordTextEnter = stanfordText.enter().append('g').attr("class", function (d) {
      return CLASS.stanfordText + (d['class'] ? ' ' + d['class'] : '');
    });
    stanfordTextEnter.append('text').attr("x", function (d) {
      return config.axis_rotated ? yvCustom(d, 'y') : xvCustom(d, 'x');
    }).attr("y", function (d) {
      return config.axis_rotated ? xvCustom(d, 'x') : yvCustom(d, 'y');
    }).style("opacity", 0); // update

    $$.stanfordTexts = stanfordTextEnter.merge(stanfordText);
    $$.stanfordTexts.select('text').transition().duration(duration).attr("x", function (d) {
      return config.axis_rotated ? yvCustom(d, 'y') : xvCustom(d, 'x');
    }).attr("y", function (d) {
      return config.axis_rotated ? xvCustom(d, 'x') : yvCustom(d, 'y');
    }).text(function (d) {
      return d.content;
    }).style("opacity", 1); // exit

    stanfordText.exit().transition().duration(duration).style("opacity", 0).remove(); // Stanford-Regions

    stanfordRegion = main.select('.' + CLASS.stanfordRegions).selectAll('.' + CLASS.stanfordRegion).data(config.stanford_regions); // enter

    stanfordRegionEnter = stanfordRegion.enter().append('g').attr("class", function (d) {
      return CLASS.stanfordRegion + (d['class'] ? ' ' + d['class'] : '');
    });
    stanfordRegionEnter.append('polygon').attr("points", function (d) {
      return d.points.map(function (value) {
        return [config.axis_rotated ? yvCustom(value, 'y') : xvCustom(value, 'x'), config.axis_rotated ? xvCustom(value, 'x') : yvCustom(value, 'y')].join(",");
      }).join(" ");
    }).style("opacity", 0);
    stanfordRegionEnter.append('text').attr("x", function (d) {
      return $$.getCentroid(d.points).x;
    }).attr("y", function (d) {
      return $$.getCentroid(d.points).y;
    }).style("opacity", 0); // update

    $$.stanfordRegions = stanfordRegionEnter.merge(stanfordRegion);
    $$.stanfordRegions.select('polygon').transition().duration(duration).attr("points", function (d) {
      return d.points.map(function (value) {
        return [config.axis_rotated ? yvCustom(value, 'y') : xvCustom(value, 'x'), config.axis_rotated ? xvCustom(value, 'x') : yvCustom(value, 'y')].join(",");
      }).join(" ");
    }).style("opacity", function (d) {
      return d.opacity ? d.opacity : 0.2;
    });
    $$.stanfordRegions.select('text').transition().duration(duration).attr("x", function (d) {
      return config.axis_rotated ? yvCustom($$.getCentroid(d.points), 'y') : xvCustom($$.getCentroid(d.points), 'x');
    }).attr("y", function (d) {
      return config.axis_rotated ? xvCustom($$.getCentroid(d.points), 'x') : yvCustom($$.getCentroid(d.points), 'y');
    }).text(function (d) {
      if (d.text) {
        var value, percentage, temp;

        if ($$.isStanfordGraphType()) {
          temp = countPointsInRegion(d.points);
          value = temp.value;
          percentage = temp.percentage;
        }

        return d.text(value, percentage);
      }

      return "";
    }).attr("text-anchor", "middle").attr("dominant-baseline", "middle").style("opacity", 1); // exit

    stanfordRegion.exit().transition().duration(duration).style("opacity", 0).remove();
  };

  ChartInternal.prototype.initTooltip = function () {
    var $$ = this,
        config = $$.config,
        i;
    $$.tooltip = $$.selectChart.style("position", "relative").append("div").attr('class', CLASS.tooltipContainer).style("position", "absolute").style("pointer-events", "none").style("display", "none"); // Show tooltip if needed

    if (config.tooltip_init_show) {
      if ($$.isTimeSeries() && isString(config.tooltip_init_x)) {
        config.tooltip_init_x = $$.parseDate(config.tooltip_init_x);

        for (i = 0; i < $$.data.targets[0].values.length; i++) {
          if ($$.data.targets[0].values[i].x - config.tooltip_init_x === 0) {
            break;
          }
        }

        config.tooltip_init_x = i;
      }

      $$.tooltip.html(config.tooltip_contents.call($$, $$.data.targets.map(function (d) {
        return $$.addName(d.values[config.tooltip_init_x]);
      }), $$.axis.getXAxisTickFormat(), $$.getYFormat($$.hasArcType()), $$.color));
      $$.tooltip.style("top", config.tooltip_init_position.top).style("left", config.tooltip_init_position.left).style("display", "block");
    }
  };

  ChartInternal.prototype.getTooltipSortFunction = function () {
    var $$ = this,
        config = $$.config;

    if (config.data_groups.length === 0 || config.tooltip_order !== undefined) {
      // if data are not grouped or if an order is specified
      // for the tooltip values we sort them by their values
      var order = config.tooltip_order;

      if (order === undefined) {
        order = config.data_order;
      }

      var valueOf = function valueOf(obj) {
        return obj ? obj.value : null;
      }; // if data are not grouped, we sort them by their value


      if (isString(order) && order.toLowerCase() === 'asc') {
        return function (a, b) {
          return valueOf(a) - valueOf(b);
        };
      } else if (isString(order) && order.toLowerCase() === 'desc') {
        return function (a, b) {
          return valueOf(b) - valueOf(a);
        };
      } else if (isFunction(order)) {
        // if the function is from data_order we need
        // to wrap the returned function in order to format
        // the sorted value to the expected format
        var sortFunction = order;

        if (config.tooltip_order === undefined) {
          sortFunction = function sortFunction(a, b) {
            return order(a ? {
              id: a.id,
              values: [a]
            } : null, b ? {
              id: b.id,
              values: [b]
            } : null);
          };
        }

        return sortFunction;
      } else if (isArray(order)) {
        return function (a, b) {
          return order.indexOf(a.id) - order.indexOf(b.id);
        };
      }
    } else {
      // if data are grouped, we follow the order of grouped targets
      var ids = $$.orderTargets($$.data.targets).map(function (i) {
        return i.id;
      }); // if it was either asc or desc we need to invert the order
      // returned by orderTargets

      if ($$.isOrderAsc() || $$.isOrderDesc()) {
        ids = ids.reverse();
      }

      return function (a, b) {
        return ids.indexOf(a.id) - ids.indexOf(b.id);
      };
    }
  };

  ChartInternal.prototype.getTooltipContent = function (d, defaultTitleFormat, defaultValueFormat, color) {
    var $$ = this,
        config = $$.config,
        titleFormat = config.tooltip_format_title || defaultTitleFormat,
        nameFormat = config.tooltip_format_name || function (name) {
      return name;
    },
        text,
        i,
        title,
        value,
        name,
        bgcolor;

    var valueFormat = config.tooltip_format_value;

    if (!valueFormat) {
      valueFormat = $$.isTargetNormalized(d.id) ? function (v, ratio) {
        return "".concat((ratio * 100).toFixed(2), "%");
      } : defaultValueFormat;
    }

    var tooltipSortFunction = this.getTooltipSortFunction();

    if (tooltipSortFunction) {
      d.sort(tooltipSortFunction);
    }

    for (i = 0; i < d.length; i++) {
      if (!(d[i] && (d[i].value || d[i].value === 0))) {
        continue;
      }

      if ($$.isStanfordGraphType()) {
        // Custom tooltip for stanford plots
        if (!text) {
          title = $$.getStanfordTooltipTitle(d[i]);
          text = "<table class='" + $$.CLASS.tooltip + "'>" + title;
        }

        bgcolor = $$.getStanfordPointColor(d[i]);
        name = sanitise(config.data_epochs); // Epochs key name

        value = d[i].epochs;
      } else {
        // Regular tooltip
        if (!text) {
          title = sanitise(titleFormat ? titleFormat(d[i].x, d[i].index) : d[i].x);
          text = "<table class='" + $$.CLASS.tooltip + "'>" + (title || title === 0 ? "<tr><th colspan='2'>" + title + "</th></tr>" : "");
        }

        value = sanitise(valueFormat(d[i].value, d[i].ratio, d[i].id, d[i].index, d));

        if (value !== undefined) {
          // Skip elements when their name is set to null
          if (d[i].name === null) {
            continue;
          }

          name = sanitise(nameFormat(d[i].name, d[i].ratio, d[i].id, d[i].index));
          bgcolor = $$.levelColor ? $$.levelColor(d[i].value) : color(d[i].id);
        }
      }

      if (value !== undefined) {
        text += "<tr class='" + $$.CLASS.tooltipName + "-" + $$.getTargetSelectorSuffix(d[i].id) + "'>";
        text += "<td class='name'><span style='background-color:" + bgcolor + "'></span>" + name + "</td>";
        text += "<td class='value'>" + value + "</td>";
        text += "</tr>";
      }
    }

    return text + "</table>";
  };

  ChartInternal.prototype.tooltipPosition = function (dataToShow, tWidth, tHeight, element) {
    var $$ = this,
        config = $$.config,
        d3 = $$.d3;
    var svgLeft, tooltipLeft, tooltipRight, tooltipTop, chartRight;
    var forArc = $$.hasArcType(),
        mouse = d3.mouse(element); // Determin tooltip position

    if (forArc) {
      tooltipLeft = ($$.width - ($$.isLegendRight ? $$.getLegendWidth() : 0)) / 2 + mouse[0];
      tooltipTop = ($$.hasType('gauge') ? $$.height : $$.height / 2) + mouse[1] + 20;
    } else {
      svgLeft = $$.getSvgLeft(true);

      if (config.axis_rotated) {
        tooltipLeft = svgLeft + mouse[0] + 100;
        tooltipRight = tooltipLeft + tWidth;
        chartRight = $$.currentWidth - $$.getCurrentPaddingRight();
        tooltipTop = $$.x(dataToShow[0].x) + 20;
      } else {
        tooltipLeft = svgLeft + $$.getCurrentPaddingLeft(true) + $$.x(dataToShow[0].x) + 20;
        tooltipRight = tooltipLeft + tWidth;
        chartRight = svgLeft + $$.currentWidth - $$.getCurrentPaddingRight();
        tooltipTop = mouse[1] + 15;
      }

      if (tooltipRight > chartRight) {
        // 20 is needed for Firefox to keep tooltip width
        tooltipLeft -= tooltipRight - chartRight + 20;
      }

      if (tooltipTop + tHeight > $$.currentHeight) {
        tooltipTop -= tHeight + 30;
      }
    }

    if (tooltipTop < 0) {
      tooltipTop = 0;
    }

    return {
      top: tooltipTop,
      left: tooltipLeft
    };
  };

  ChartInternal.prototype.showTooltip = function (selectedData, element) {
    var $$ = this,
        config = $$.config;
    var tWidth, tHeight, position;
    var forArc = $$.hasArcType(),
        dataToShow = selectedData.filter(function (d) {
      return d && isValue(d.value);
    }),
        positionFunction = config.tooltip_position || ChartInternal.prototype.tooltipPosition;

    if (dataToShow.length === 0 || !config.tooltip_show) {
      return;
    }

    $$.tooltip.html(config.tooltip_contents.call($$, selectedData, $$.axis.getXAxisTickFormat(), $$.getYFormat(forArc), $$.color)).style("display", "block"); // Get tooltip dimensions

    tWidth = $$.tooltip.property('offsetWidth');
    tHeight = $$.tooltip.property('offsetHeight');
    position = positionFunction.call(this, dataToShow, tWidth, tHeight, element); // Set tooltip

    $$.tooltip.style("top", position.top + "px").style("left", position.left + 'px');
  };

  ChartInternal.prototype.hideTooltip = function () {
    this.tooltip.style("display", "none");
  };

  ChartInternal.prototype.setTargetType = function (targetIds, type) {
    var $$ = this,
        config = $$.config;
    $$.mapToTargetIds(targetIds).forEach(function (id) {
      $$.withoutFadeIn[id] = type === config.data_types[id];
      config.data_types[id] = type;
    });

    if (!targetIds) {
      config.data_type = type;
    }
  };

  ChartInternal.prototype.hasType = function (type, targets) {
    var $$ = this,
        types = $$.config.data_types,
        has = false;
    targets = targets || $$.data.targets;

    if (targets && targets.length) {
      targets.forEach(function (target) {
        var t = types[target.id];

        if (t && t.indexOf(type) >= 0 || !t && type === 'line') {
          has = true;
        }
      });
    } else if (Object.keys(types).length) {
      Object.keys(types).forEach(function (id) {
        if (types[id] === type) {
          has = true;
        }
      });
    } else {
      has = $$.config.data_type === type;
    }

    return has;
  };

  ChartInternal.prototype.hasArcType = function (targets) {
    return this.hasType('pie', targets) || this.hasType('donut', targets) || this.hasType('gauge', targets);
  };

  ChartInternal.prototype.isLineType = function (d) {
    var config = this.config,
        id = isString(d) ? d : d.id;
    return !config.data_types[id] || ['line', 'spline', 'area', 'area-spline', 'step', 'area-step'].indexOf(config.data_types[id]) >= 0;
  };

  ChartInternal.prototype.isStepType = function (d) {
    var id = isString(d) ? d : d.id;
    return ['step', 'area-step'].indexOf(this.config.data_types[id]) >= 0;
  };

  ChartInternal.prototype.isSplineType = function (d) {
    var id = isString(d) ? d : d.id;
    return ['spline', 'area-spline'].indexOf(this.config.data_types[id]) >= 0;
  };

  ChartInternal.prototype.isAreaType = function (d) {
    var id = isString(d) ? d : d.id;
    return ['area', 'area-spline', 'area-step'].indexOf(this.config.data_types[id]) >= 0;
  };

  ChartInternal.prototype.isBarType = function (d) {
    var id = isString(d) ? d : d.id;
    return this.config.data_types[id] === 'bar';
  };

  ChartInternal.prototype.isScatterType = function (d) {
    var id = isString(d) ? d : d.id;
    return this.config.data_types[id] === 'scatter';
  };

  ChartInternal.prototype.isStanfordType = function (d) {
    var id = isString(d) ? d : d.id;
    return this.config.data_types[id] === 'stanford';
  };

  ChartInternal.prototype.isPieType = function (d) {
    var id = isString(d) ? d : d.id;
    return this.config.data_types[id] === 'pie';
  };

  ChartInternal.prototype.isGaugeType = function (d) {
    var id = isString(d) ? d : d.id;
    return this.config.data_types[id] === 'gauge';
  };

  ChartInternal.prototype.isDonutType = function (d) {
    var id = isString(d) ? d : d.id;
    return this.config.data_types[id] === 'donut';
  };

  ChartInternal.prototype.isArcType = function (d) {
    return this.isPieType(d) || this.isDonutType(d) || this.isGaugeType(d);
  };

  ChartInternal.prototype.lineData = function (d) {
    return this.isLineType(d) ? [d] : [];
  };

  ChartInternal.prototype.arcData = function (d) {
    return this.isArcType(d.data) ? [d] : [];
  };
  /* not used
   function scatterData(d) {
   return isScatterType(d) ? d.values : [];
   }
   */


  ChartInternal.prototype.barData = function (d) {
    return this.isBarType(d) ? d.values : [];
  };

  ChartInternal.prototype.lineOrScatterOrStanfordData = function (d) {
    return this.isLineType(d) || this.isScatterType(d) || this.isStanfordType(d) ? d.values : [];
  };

  ChartInternal.prototype.barOrLineData = function (d) {
    return this.isBarType(d) || this.isLineType(d) ? d.values : [];
  };

  ChartInternal.prototype.isSafari = function () {
    var ua = window.navigator.userAgent;
    return ua.indexOf('Safari') >= 0 && ua.indexOf('Chrome') < 0;
  };

  ChartInternal.prototype.isChrome = function () {
    var ua = window.navigator.userAgent;
    return ua.indexOf('Chrome') >= 0;
  };

  ChartInternal.prototype.initZoom = function () {
    var $$ = this,
        d3 = $$.d3,
        config = $$.config,
        startEvent;
    $$.zoom = d3.zoom().on("start", function () {
      if (config.zoom_type !== 'scroll') {
        return;
      }

      var e = d3.event.sourceEvent;

      if (e && e.type === "brush") {
        return;
      }

      startEvent = e;
      config.zoom_onzoomstart.call($$.api, e);
    }).on("zoom", function () {
      if (config.zoom_type !== 'scroll') {
        return;
      }

      var e = d3.event.sourceEvent;

      if (e && e.type === "brush") {
        return;
      }

      $$.redrawForZoom();
      config.zoom_onzoom.call($$.api, $$.x.orgDomain());
    }).on('end', function () {
      if (config.zoom_type !== 'scroll') {
        return;
      }

      var e = d3.event.sourceEvent;

      if (e && e.type === "brush") {
        return;
      } // if click, do nothing. otherwise, click interaction will be canceled.


      if (e && startEvent.clientX === e.clientX && startEvent.clientY === e.clientY) {
        return;
      }

      config.zoom_onzoomend.call($$.api, $$.x.orgDomain());
    });

    $$.zoom.updateDomain = function () {
      if (d3.event && d3.event.transform) {
        $$.x.domain(d3.event.transform.rescaleX($$.subX).domain());
      }

      return this;
    };

    $$.zoom.updateExtent = function () {
      this.scaleExtent([1, Infinity]).translateExtent([[0, 0], [$$.width, $$.height]]).extent([[0, 0], [$$.width, $$.height]]);
      return this;
    };

    $$.zoom.update = function () {
      return this.updateExtent().updateDomain();
    };

    return $$.zoom.updateExtent();
  };

  ChartInternal.prototype.zoomTransform = function (range) {
    var $$ = this,
        s = [$$.x(range[0]), $$.x(range[1])];
    return $$.d3.zoomIdentity.scale($$.width / (s[1] - s[0])).translate(-s[0], 0);
  };

  ChartInternal.prototype.initDragZoom = function () {
    var $$ = this;
    var d3 = $$.d3;
    var config = $$.config;
    var context = $$.context = $$.svg;
    var brushXPos = $$.margin.left + 20.5;
    var brushYPos = $$.margin.top + 0.5;

    if (!(config.zoom_type === 'drag' && config.zoom_enabled)) {
      return;
    }

    var getZoomedDomain = function getZoomedDomain(selection) {
      return selection && selection.map(function (x) {
        return $$.x.invert(x);
      });
    };

    var brush = $$.dragZoomBrush = d3.brushX().on("start", function () {
      $$.api.unzoom();
      $$.svg.select("." + CLASS.dragZoom).classed("disabled", false);
      config.zoom_onzoomstart.call($$.api, d3.event.sourceEvent);
    }).on("brush", function () {
      config.zoom_onzoom.call($$.api, getZoomedDomain(d3.event.selection));
    }).on("end", function () {
      if (d3.event.selection == null) {
        return;
      }

      var zoomedDomain = getZoomedDomain(d3.event.selection);

      if (!config.zoom_disableDefaultBehavior) {
        $$.api.zoom(zoomedDomain);
      }

      $$.svg.select("." + CLASS.dragZoom).classed("disabled", true);
      config.zoom_onzoomend.call($$.api, zoomedDomain);
    });
    context.append("g").classed(CLASS.dragZoom, true).attr("clip-path", $$.clipPath).attr("transform", "translate(" + brushXPos + "," + brushYPos + ")").call(brush);
  };

  ChartInternal.prototype.getZoomDomain = function () {
    var $$ = this,
        config = $$.config,
        d3 = $$.d3,
        min = d3.min([$$.orgXDomain[0], config.zoom_x_min]),
        max = d3.max([$$.orgXDomain[1], config.zoom_x_max]);
    return [min, max];
  };

  ChartInternal.prototype.redrawForZoom = function () {
    var $$ = this,
        d3 = $$.d3,
        config = $$.config,
        zoom = $$.zoom,
        x = $$.x;

    if (!config.zoom_enabled) {
      return;
    }

    if ($$.filterTargetsToShow($$.data.targets).length === 0) {
      return;
    }

    zoom.update();

    if (config.zoom_disableDefaultBehavior) {
      return;
    }

    if ($$.isCategorized() && x.orgDomain()[0] === $$.orgXDomain[0]) {
      x.domain([$$.orgXDomain[0] - 1e-10, x.orgDomain()[1]]);
    }

    $$.redraw({
      withTransition: false,
      withY: config.zoom_rescale,
      withSubchart: false,
      withEventRect: false,
      withDimension: false
    });

    if (d3.event.sourceEvent && d3.event.sourceEvent.type === 'mousemove') {
      $$.cancelClick = true;
    }
  };

  return c3;

})));