/**
 * @license Highcharts JS v7.0.3 (2019-02-06)
 * Tree Grid
 *
 * (c) 2016-2019 Jon Arild Nygard
 *
 * License: www.highcharts.com/license
 */
'use strict';
(function (factory) {
    if (typeof module === 'object' && module.exports) {
        factory['default'] = factory;
        module.exports = factory;
    } else if (typeof define === 'function' && define.amd) {
        define(function () {
            return factory;
        });
    } else {
        factory(typeof Highcharts !== 'undefined' ? Highcharts : undefined);
    }
}(function (Highcharts) {
    (function (H) {
        /* *
         * (c) 2016 Highsoft AS
         * Authors: Lars A. V. Cabrera
         *
         * License: www.highcharts.com/license
         */



        var addEvent = H.addEvent,
            argsToArray = function (args) {
                return Array.prototype.slice.call(args, 1);
            },
            dateFormat = H.dateFormat,
            defined = H.defined,
            isArray = H.isArray,
            isNumber = H.isNumber,
            isObject = function (x) {
                // Always use strict mode
                return H.isObject(x, true);
            },
            merge = H.merge,
            pick = H.pick,
            wrap = H.wrap,
            Axis = H.Axis,
            Tick = H.Tick;

        /**
         * Set grid options for the axis labels. Requires Highcharts Gantt.
         *
         * @since     6.2.0
         * @product   gantt
         * @apioption xAxis.grid
         */

        /**
         * Enable grid on the axis labels. Defaults to true for Gantt charts.
         *
         * @type      {boolean}
         * @default   true
         * @since     6.2.0
         * @product   gantt
         * @apioption xAxis.grid.enabled
         */

        /**
         * Set specific options for each column (or row for horizontal axes) in the
         * grid. Each extra column/row is its own axis, and the axis options can be set
         * here.
         *
         * @sample gantt/demo/left-axis-table
         *         Left axis as a table
         *
         * @type      {Array<Highcharts.XAxisOptions>}
         * @apioption xAxis.grid.columns
         */

        /**
         * Set border color for the label grid lines.
         *
         * @type      {Highcharts.ColorString}
         * @apioption xAxis.grid.borderColor
         */

        /**
         * Set border width of the label grid lines.
         *
         * @type      {number}
         * @default   1
         * @apioption xAxis.grid.borderWidth
         */

        /**
         * Set cell height for grid axis labels. By default this is calculated from font
         * size.
         *
         * @type      {number}
         * @apioption xAxis.grid.cellHeight
         */


        // Enum for which side the axis is on.
        // Maps to axis.side
        var axisSide = {
            top: 0,
            right: 1,
            bottom: 2,
            left: 3,
            0: 'top',
            1: 'right',
            2: 'bottom',
            3: 'left'
        };

        /**
         * Checks if an axis is a navigator axis.
         *
         * @private
         * @function Highcharts.Axis#isNavigatorAxis
         *
         * @return {boolean}
         *         true if axis is found in axis.chart.navigator
         */
        Axis.prototype.isNavigatorAxis = function () {
            return /highcharts-navigator-[xy]axis/.test(this.options.className);
        };

        /**
         * Checks if an axis is the outer axis in its dimension. Since
         * axes are placed outwards in order, the axis with the highest
         * index is the outermost axis.
         *
         * Example: If there are multiple x-axes at the top of the chart,
         * this function returns true if the axis supplied is the last
         * of the x-axes.
         *
         * @private
         * @function Highcharts.Axis#isOuterAxis
         *
         * @return {boolean}
         *         true if the axis is the outermost axis in its dimension; false if not
         */
        Axis.prototype.isOuterAxis = function () {
            var axis = this,
                chart = axis.chart,
                thisIndex = -1,
                isOuter = true;

            chart.axes.forEach(function (otherAxis, index) {
                if (otherAxis.side === axis.side && !otherAxis.isNavigatorAxis()) {
                    if (otherAxis === axis) {
                        // Get the index of the axis in question
                        thisIndex = index;

                        // Check thisIndex >= 0 in case thisIndex has
                        // not been found yet
                    } else if (thisIndex >= 0 && index > thisIndex) {
                        // There was an axis on the same side with a
                        // higher index.
                        isOuter = false;
                    }
                }
            });
            // There were either no other axes on the same side,
            // or the other axes were not farther from the chart
            return isOuter;
        };

        /**
         * Get the largest label width and height.
         *
         * @private
         * @function Highcharts.Axis#getMaxLabelDimensions
         *
         * @param {Highcharts.Dictionary<Highcharts.Tick>} ticks
         *        All the ticks on one axis.
         *
         * @param {Array<number|string>} tickPositions
         *        All the tick positions on one axis.
         *
         * @return {object}
         *         object containing the properties height and width.
         */
        Axis.prototype.getMaxLabelDimensions = function (ticks, tickPositions) {
            var dimensions = {
                width: 0,
                height: 0
            };

            tickPositions.forEach(function (pos) {
                var tick = ticks[pos],
                    tickHeight = 0,
                    tickWidth = 0,
                    label;

                if (isObject(tick)) {
                    label = isObject(tick.label) ? tick.label : {};

                    // Find width and height of tick
                    tickHeight = label.getBBox ? label.getBBox().height : 0;
                    tickWidth = isNumber(label.textPxLength) ? label.textPxLength : 0;

                    // Update the result if width and/or height are larger
                    dimensions.height = Math.max(tickHeight, dimensions.height);
                    dimensions.width = Math.max(tickWidth, dimensions.width);
                }
            });

            return dimensions;
        };

        // Add custom date formats
        H.dateFormats = {
            // Week number
            W: function (timestamp) {
                var d = new Date(timestamp),
                    yearStart,
                    weekNo;

                d.setHours(0, 0, 0, 0);
                d.setDate(d.getDate() - (d.getDay() || 7));
                yearStart = new Date(d.getFullYear(), 0, 1);
                weekNo = Math.ceil((((d - yearStart) / 86400000) + 1) / 7);
                return weekNo;
            },
            // First letter of the day of the week, e.g. 'M' for 'Monday'.
            E: function (timestamp) {
                return dateFormat('%a', timestamp, true).charAt(0);
            }
        };

        addEvent(
            Tick,
            'afterGetLabelPosition',
            /**
             * Center tick labels in cells.
             *
             * @private
             */
            function (e) {
                var tick = this,
                    label = tick.label,
                    axis = tick.axis,
                    reversed = axis.reversed,
                    chart = axis.chart,
                    options = axis.options,
                    gridOptions = (
                        (options && isObject(options.grid)) ? options.grid : {}
                    ),
                    labelOpts = axis.options.labels,
                    align = labelOpts.align,
                    // verticalAlign is currently not supported for axis.labels.
                    verticalAlign = 'middle', // labelOpts.verticalAlign,
                    side = axisSide[axis.side],
                    tickmarkOffset = e.tickmarkOffset,
                    tickPositions = axis.tickPositions,
                    tickPos = tick.pos - tickmarkOffset,
                    nextTickPos = (
                        isNumber(tickPositions[e.index + 1]) ?
                            tickPositions[e.index + 1] - tickmarkOffset :
                            axis.max + tickmarkOffset
                    ),
                    tickSize = axis.tickSize('tick', true),
                    tickWidth = isArray(tickSize) ? tickSize[0] : 0,
                    crispCorr = tickSize && tickSize[1] / 2,
                    labelHeight,
                    lblMetrics,
                    lines,
                    bottom,
                    top,
                    left,
                    right;

                // Only center tick labels in grid axes
                if (gridOptions.enabled === true) {

                    // Calculate top and bottom positions of the cell.
                    if (side === 'top') {
                        bottom = axis.top + axis.offset;
                        top = bottom - tickWidth;
                    } else if (side === 'bottom') {
                        top = chart.chartHeight - axis.bottom + axis.offset;
                        bottom = top + tickWidth;
                    } else {
                        bottom = axis.top + axis.len - axis.translate(
                            reversed ? nextTickPos : tickPos
                        );
                        top = axis.top + axis.len - axis.translate(
                            reversed ? tickPos : nextTickPos
                        );
                    }

                    // Calculate left and right positions of the cell.
                    if (side === 'right') {
                        left = chart.chartWidth - axis.right + axis.offset;
                        right = left + tickWidth;
                    } else if (side === 'left') {
                        right = axis.left + axis.offset;
                        left = right - tickWidth;
                    } else {
                        left = Math.round(axis.left + axis.translate(
                            reversed ? nextTickPos : tickPos
                        )) - crispCorr;
                        right = Math.round(axis.left + axis.translate(
                            reversed ? tickPos : nextTickPos
                        )) - crispCorr;
                    }

                    tick.slotWidth = right - left;

                    // Calculate the positioning of the label based on alignment.
                    e.pos.x = (
                        align === 'left' ?
                            left :
                            align === 'right' ?
                                right :
                                left + ((right - left) / 2) // default to center
                    );
                    e.pos.y = (
                        verticalAlign === 'top' ?
                            top :
                            verticalAlign === 'bottom' ?
                                bottom :
                                top + ((bottom - top) / 2) // default to middle
                    );

                    lblMetrics = chart.renderer.fontMetrics(
                        labelOpts.style.fontSize,
                        label.element
                    );
                    labelHeight = label.getBBox().height;

                    // Adjustment to y position to align the label correctly.
                    // Would be better to have a setter or similar for this.
                    if (!labelOpts.useHTML) {
                        lines = Math.round(labelHeight / lblMetrics.h);
                        e.pos.y += (
                            // Center the label
                            // TODO: why does this actually center the label?
                            ((lblMetrics.b - (lblMetrics.h - lblMetrics.f)) / 2) +
                            // Adjust for height of additional lines.
                            -(((lines - 1) * lblMetrics.h) / 2)
                        );
                    } else {
                        e.pos.y += (
                            // Readjust yCorr in htmlUpdateTransform
                            lblMetrics.b +
                            // Adjust for height of html label
                            -(labelHeight / 2)
                        );
                    }

                    e.pos.x += (axis.horiz && labelOpts.x || 0);
                }
            }
        );

        // Draw vertical axis ticks extra long to create cell floors and roofs.
        // Overrides the tickLength for vertical axes.
        addEvent(Axis, 'afterTickSize', function (e) {
            var axis = this,
                dimensions = axis.maxLabelDimensions,
                options = axis.options,
                gridOptions = (options && isObject(options.grid)) ? options.grid : {},
                labelPadding,
                distance;

            if (gridOptions.enabled === true) {
                labelPadding = (Math.abs(axis.defaultLeftAxisOptions.labels.x) * 2);
                distance = labelPadding +
                    (axis.horiz ? dimensions.height : dimensions.width);

                if (isArray(e.tickSize)) {
                    e.tickSize[0] = distance;
                } else {
                    e.tickSize = [distance];
                }
            }
        });

        addEvent(Axis, 'afterGetTitlePosition', function (e) {
            var axis = this,
                options = axis.options,
                gridOptions = (options && isObject(options.grid)) ? options.grid : {};

            if (gridOptions.enabled === true) {
                // compute anchor points for each of the title align options
                var title = axis.axisTitle,
                    titleWidth = title && title.getBBox().width,
                    horiz = axis.horiz,
                    axisLeft = axis.left,
                    axisTop = axis.top,
                    axisWidth = axis.width,
                    axisHeight = axis.height,
                    axisTitleOptions = options.title,
                    opposite = axis.opposite,
                    offset = axis.offset,
                    tickSize = axis.tickSize() || [0],
                    xOption = axisTitleOptions.x || 0,
                    yOption = axisTitleOptions.y || 0,
                    titleMargin = pick(axisTitleOptions.margin, horiz ? 5 : 10),
                    titleFontSize = axis.chart.renderer.fontMetrics(
                        axisTitleOptions.style && axisTitleOptions.style.fontSize,
                        title
                    ).f,
                    // TODO account for alignment
                    // the position in the perpendicular direction of the axis
                    offAxis = (horiz ? axisTop + axisHeight : axisLeft) +
                        (horiz ? 1 : -1) * // horizontal axis reverses the margin
                        (opposite ? -1 : 1) * // so does opposite axes
                        (tickSize[0] / 2) +
                        (axis.side === axisSide.bottom ? titleFontSize : 0);

                e.titlePosition.x = horiz ?
                    axisLeft - titleWidth / 2 - titleMargin + xOption :
                    offAxis + (opposite ? axisWidth : 0) + offset + xOption;
                e.titlePosition.y = horiz ?
                    (
                        offAxis -
                        (opposite ? axisHeight : 0) +
                        (opposite ? titleFontSize : -titleFontSize) / 2 +
                        offset +
                        yOption
                    ) :
                    axisTop - titleMargin + yOption;
            }
        });

        // Avoid altering tickInterval when reserving space.
        wrap(Axis.prototype, 'unsquish', function (proceed) {
            var axis = this,
                options = axis.options,
                gridOptions = (options && isObject(options.grid)) ? options.grid : {};

            if (gridOptions.enabled === true && this.categories) {
                return this.tickInterval;
            }

            return proceed.apply(this, argsToArray(arguments));
        });

        addEvent(
            Axis,
            'afterSetOptions',
            /**
             * Creates a left and right wall on horizontal axes:
             *
             * - Places leftmost tick at the start of the axis, to create a left wall
             *
             * - Ensures that the rightmost tick is at the end of the axis, to create a
             *   right wall.
             *
             * @private
             * @function
             */
            function (e) {
                var options = this.options,
                    userOptions = e.userOptions,
                    gridAxisOptions,
                    gridOptions = (
                        (options && isObject(options.grid)) ? options.grid : {}
                    );

                if (gridOptions.enabled === true) {

                    // Merge the user options into default grid axis options so that
                    // when a user option is set, it takes presedence.
                    gridAxisOptions = merge(true, {

                        className: (
                            'highcharts-grid-axis ' + (userOptions.className || '')
                        ),

                        dateTimeLabelFormats: {
                            hour: {
                                list: ['%H:%M', '%H']
                            },
                            day: {
                                list: ['%A, %e. %B', '%a, %e. %b', '%E']
                            },
                            week: {
                                list: ['Week %W', 'W%W']
                            },
                            month: {
                                list: ['%B', '%b', '%o']
                            }
                        },

                        grid: {
                            borderWidth: 1
                        },

                        labels: {
                            padding: 2,
                            style: {
                                fontSize: '13px'
                            }
                        },

                        margin: 0,

                        title: {
                            text: null,
                            reserveSpace: false,
                            rotation: 0
                        },

                        // In a grid axis, only allow one unit of certain types, for
                        // example we shouln't have one grid cell spanning two days.
                        units: [[
                            'millisecond', // unit name
                            [1, 10, 100]
                        ], [
                            'second',
                            [1, 10]
                        ], [
                            'minute',
                            [1, 5, 15]
                        ], [
                            'hour',
                            [1, 6]
                        ], [
                            'day',
                            [1]
                        ], [
                            'week',
                            [1]
                        ], [
                            'month',
                            [1]
                        ], [
                            'year',
                            null
                        ]]
                    }, userOptions);

                    // X-axis specific options
                    if (this.coll === 'xAxis') {

                        // For linked axes, tickPixelInterval is used only if the
                        // tickPositioner below doesn't run or returns undefined (like
                        // multiple years)
                        if (
                            defined(userOptions.linkedTo) &&
                            !defined(userOptions.tickPixelInterval)
                        ) {
                            gridAxisOptions.tickPixelInterval = 350;
                        }

                        // For the secondary grid axis, use the primary axis' tick
                        // intervals and return ticks one level higher.
                        if (
                            // Check for tick pixel interval in options
                            !defined(userOptions.tickPixelInterval) &&

                            // Only for linked axes
                            defined(userOptions.linkedTo) &&

                            !defined(userOptions.tickPositioner) &&
                            !defined(userOptions.tickInterval)
                        ) {
                            gridAxisOptions.tickPositioner = function (min, max) {

                                var parentInfo = (
                                    this.linkedParent &&
                                    this.linkedParent.tickPositions &&
                                    this.linkedParent.tickPositions.info
                                );

                                if (parentInfo) {

                                    var unitIdx,
                                        count,
                                        unitName,
                                        i,
                                        units = gridAxisOptions.units,
                                        unitRange;

                                    for (i = 0; i < units.length; i++) {
                                        if (units[i][0] === parentInfo.unitName) {
                                            unitIdx = i;
                                            break;
                                        }
                                    }

                                    // Spanning multiple years, go default
                                    if (!units[unitIdx][1]) {
                                        return;
                                    }

                                    // Get the first allowed count on the next unit.
                                    if (units[unitIdx + 1]) {
                                        unitName = units[unitIdx + 1][0];
                                        count = (units[unitIdx + 1][1] || [1])[0];
                                    }

                                    unitRange = H.timeUnits[unitName];
                                    this.tickInterval = unitRange * count;
                                    return this.getTimeTicks(
                                        {
                                            unitRange: unitRange,
                                            count: count,
                                            unitName: unitName
                                        },
                                        min,
                                        max,
                                        this.options.startOfWeek
                                    );
                                }
                            };
                        }

                    }

                    // Now merge the combined options into the axis options
                    merge(true, this.options, gridAxisOptions);

                    if (this.horiz) {
                        /*               _________________________
                           Make this:    ___|_____|_____|_____|__|
                                         ^                     ^
                                         _________________________
                           Into this:    |_____|_____|_____|_____|
                                            ^                 ^    */
                        options.minPadding = pick(userOptions.minPadding, 0);
                        options.maxPadding = pick(userOptions.maxPadding, 0);
                    }

                    // If borderWidth is set, then use its value for tick and line
                    // width.
                    if (isNumber(options.grid.borderWidth)) {
                        options.tickWidth = options.lineWidth = gridOptions.borderWidth;
                    }

                }
            }
        );

        addEvent(
            Axis,
            'afterSetAxisTranslation',
            function () {
                var axis = this,
                    options = axis.options,
                    gridOptions = (
                        (options && isObject(options.grid)) ? options.grid : {}
                    ),
                    tickInfo = this.tickPositions && this.tickPositions.info,
                    userLabels = this.userOptions.labels || {};

                if (this.horiz) {
                    if (gridOptions.enabled === true) {
                        axis.series.forEach(function (series) {
                            series.options.pointRange = 0;
                        });
                    }

                    // Lower level time ticks, like hours or minutes, represent points
                    // in time and not ranges. These should be aligned left in the grid
                    // cell by default. The same applies to years of higher order.
                    if (
                        tickInfo &&
                        (
                            options.dateTimeLabelFormats[tickInfo.unitName]
                                .range === false ||
                            tickInfo.count > 1 // years
                        ) &&
                        !defined(userLabels.align)
                    ) {
                        options.labels.align = 'left';

                        if (!defined(userLabels.x)) {
                            options.labels.x = 3;
                        }
                    }
                }
            }
        );

        // @todo Does this function do what the drawing says? Seems to affect ticks and
        //       not the labels directly?
        addEvent(
            Axis,
            'trimTicks',
            /**
             * Makes tick labels which are usually ignored in a linked axis displayed if
             * they are within range of linkedParent.min.
             * ```
             *                        _____________________________
             *                        |   |       |       |       |
             * Make this:             |   |   2   |   3   |   4   |
             *                        |___|_______|_______|_______|
             *                          ^
             *                        _____________________________
             *                        |   |       |       |       |
             * Into this:             | 1 |   2   |   3   |   4   |
             *                        |___|_______|_______|_______|
             *                          ^
             * ```
             *
             * @private
             */
            function () {
                var axis = this,
                    options = axis.options,
                    gridOptions = (
                        (options && isObject(options.grid)) ? options.grid : {}
                    ),
                    categoryAxis = axis.categories,
                    tickPositions = axis.tickPositions,
                    firstPos = tickPositions[0],
                    lastPos = tickPositions[tickPositions.length - 1],
                    linkedMin = axis.linkedParent && axis.linkedParent.min,
                    linkedMax = axis.linkedParent && axis.linkedParent.max,
                    min = linkedMin || axis.min,
                    max = linkedMax || axis.max,
                    tickInterval = axis.tickInterval,
                    moreThanMin = firstPos > min,
                    lessThanMax = lastPos < max,
                    endMoreThanMin = firstPos < min && firstPos + tickInterval > min,
                    startLessThanMax = lastPos > max && lastPos - tickInterval < max;

                if (
                    gridOptions.enabled === true &&
                    !categoryAxis &&
                    (axis.horiz || axis.isLinked)
                ) {
                    if ((moreThanMin || endMoreThanMin) && !options.startOnTick) {
                        tickPositions[0] = min;
                    }

                    if ((lessThanMax || startLessThanMax) && !options.endOnTick) {
                        tickPositions[tickPositions.length - 1] = max;
                    }
                }
            }
        );

        addEvent(
            Axis,
            'afterRender',
            /**
             * Draw an extra line on the far side of the outermost axis,
             * creating floor/roof/wall of a grid. And some padding.
             * ```
             * Make this:
             *             (axis.min) __________________________ (axis.max)
             *                           |    |    |    |    |
             * Into this:
             *             (axis.min) __________________________ (axis.max)
             *                        ___|____|____|____|____|__
             * ```
             *
             * @private
             * @function
             *
             * @param {Function} proceed
             *        the original function
             */
            function () {
                var axis = this,
                    options = axis.options,
                    gridOptions = ((
                        options && isObject(options.grid)) ? options.grid : {}
                    ),
                    labelPadding,
                    distance,
                    lineWidth,
                    linePath,
                    yStartIndex,
                    yEndIndex,
                    xStartIndex,
                    xEndIndex,
                    renderer = axis.chart.renderer,
                    horiz = axis.horiz,
                    axisGroupBox;

                if (gridOptions.enabled === true) {

                    // @todo acutual label padding (top, bottom, left, right)

                    // Label padding is needed to figure out where to draw the outer
                    // line.
                    labelPadding = (Math.abs(axis.defaultLeftAxisOptions.labels.x) * 2);
                    axis.maxLabelDimensions = axis.getMaxLabelDimensions(
                        axis.ticks,
                        axis.tickPositions
                    );
                    distance = axis.maxLabelDimensions.width + labelPadding;
                    lineWidth = options.lineWidth;

                    // Remove right wall before rendering if updating
                    if (axis.rightWall) {
                        axis.rightWall.destroy();
                    }

                    axisGroupBox = axis.axisGroup.getBBox();

                    /*
                       Draw an extra axis line on outer axes
                                   >
                       Make this:    |______|______|______|___

                                   > _________________________
                       Into this:    |______|______|______|__|
                                                               */
                    if (axis.isOuterAxis() && axis.axisLine) {
                        if (horiz) {
                            // -1 to avoid adding distance each time the chart updates
                            distance = axisGroupBox.height - 1;
                        }

                        if (lineWidth) {
                            linePath = axis.getLinePath(lineWidth);
                            xStartIndex = linePath.indexOf('M') + 1;
                            xEndIndex = linePath.indexOf('L') + 1;
                            yStartIndex = linePath.indexOf('M') + 2;
                            yEndIndex = linePath.indexOf('L') + 2;

                            // Negate distance if top or left axis
                            if (axis.side === axisSide.top ||
                                axis.side === axisSide.left
                            ) {
                                distance = -distance;
                            }

                            // If axis is horizontal, reposition line path vertically
                            if (horiz) {
                                linePath[yStartIndex] = (
                                    linePath[yStartIndex] + distance
                                );
                                linePath[yEndIndex] = linePath[yEndIndex] + distance;
                            } else {
                                // If axis is vertical, reposition line path
                                // horizontally
                                linePath[xStartIndex] = (
                                    linePath[xStartIndex] + distance
                                );
                                linePath[xEndIndex] = linePath[xEndIndex] + distance;
                            }

                            if (!axis.axisLineExtra) {
                                axis.axisLineExtra = renderer.path(linePath)
                                    .attr({
                                
                                        stroke: options.lineColor,
                                        'stroke-width': lineWidth,
                                
                                        zIndex: 7
                                    })
                                    .addClass('highcharts-axis-line')
                                    .add(axis.axisGroup);
                            } else {
                                axis.axisLineExtra.animate({
                                    d: linePath
                                });
                            }

                            // show or hide the line depending on options.showEmpty
                            axis.axisLine[axis.showAxis ? 'show' : 'hide'](true);
                        }
                    }

                }
            }
        );

        // Wraps axis init to draw cell walls on vertical axes.
        addEvent(Axis, 'init', function (e) {
            var axis = this,
                chart = axis.chart,
                userOptions = e.userOptions,
                gridOptions = (
                    (userOptions && isObject(userOptions.grid)) ?
                        userOptions.grid :
                        {}
                ),
                columnOptions,
                column,
                columnIndex,
                i;

            function applyGridOptions() {
                var options = axis.options,
                    // TODO: Consider using cell margins defined in % of font size?
                    // 25 is optimal height for default fontSize (11px)
                    // 25 / 11 ≈ 2.28
                    fontSizeToCellHeightRatio = 25 / 11,
                    fontSize = options.labels.style.fontSize,
                    fontMetrics = axis.chart.renderer.fontMetrics(fontSize);

                // Center-align by default
                if (!options.labels) {
                    options.labels = {};
                }
                options.labels.align = pick(options.labels.align, 'center');

                // @todo: Check against tickLabelPlacement between/on etc

                /* Prevents adding the last tick label if the axis is not a category
                   axis.
                   Since numeric labels are normally placed at starts and ends of a
                   range of value, and this module makes the label point at the value,
                   an "extra" label would appear. */
                if (!axis.categories) {
                    options.showLastLabel = false;
                }

                // Make tick marks taller, creating cell walls of a grid. Use cellHeight
                // axis option if set
                if (axis.horiz) {
                    options.tickLength = gridOptions.cellHeight ||
                            fontMetrics.h * fontSizeToCellHeightRatio;
                }

                // Prevents rotation of labels when squished, as rotating them would not
                // help.
                axis.labelRotation = 0;
                options.labels.rotation = 0;
            }

            if (gridOptions.enabled) {
                if (defined(gridOptions.borderColor)) {
                    userOptions.tickColor =
                        userOptions.lineColor = gridOptions.borderColor;
                }

                // Handle columns, each column is a grid axis
                if (isArray(gridOptions.columns)) {
                    columnIndex = 0;
                    i = gridOptions.columns.length;
                    while (i--) {
                        columnOptions = merge(
                            userOptions,
                            gridOptions.columns[i],
                            {
                                // Force to behave like category axis
                                type: 'category'
                            }
                        );

                        delete columnOptions.grid.columns; // Prevent recursion

                        column = new Axis(axis.chart, columnOptions);
                        column.isColumn = true;
                        column.columnIndex = columnIndex;

                        wrap(column, 'labelFormatter', function (proceed) {
                            var axis = this.axis,
                                tickPos = axis.tickPositions,
                                value = this.value,
                                series = axis.series[0],
                                isFirst = value === tickPos[0],
                                isLast = value === tickPos[tickPos.length - 1],
                                point = H.find(series.options.data, function (p) {
                                    return p[axis.isXAxis ? 'x' : 'y'] === value;
                                });

                            // Make additional properties available for the formatter
                            this.isFirst = isFirst;
                            this.isLast = isLast;
                            this.point = point;

                            // Call original labelFormatter
                            return proceed.call(this);
                        });

                        columnIndex++;
                    }
                    // This axis should not be shown, instead the column axes take over
                    addEvent(this, 'afterInit', function () {
                        H.erase(chart.axes, this);
                        H.erase(chart[axis.coll], this);
                    });
                } else {
                    addEvent(this, 'afterInit', applyGridOptions);
                }
            }
        });

    }(Highcharts));
    var Tree = (function (H) {
        /* *
         *
         *  (c) 2016-2019 Highsoft AS
         *
         *  Authors: Jon Arild Nygard
         *
         *  License: www.highcharts.com/license
         *
         * */

        /* eslint no-console: 0 */



        var extend = H.extend,
            isNumber = H.isNumber,
            pick = H.pick,
            isFunction = function (x) {
                return typeof x === 'function';
            };

        /**
         * Creates an object map from parent id to childrens index.
         *
         * @private
         * @function Highcharts.Tree#getListOfParents
         *
         * @param {Array<*>} data
         *        List of points set in options. `Array<*>.parent`is parent id of point.
         *
         * @param {Array<string>} ids
         *        List of all point ids.
         *
         * @return {object}
         *         Map from parent id to children index in data
         */
        var getListOfParents = function (data, ids) {
            var listOfParents = data.reduce(function (prev, curr) {
                    var parent = pick(curr.parent, '');

                    if (prev[parent] === undefined) {
                        prev[parent] = [];
                    }
                    prev[parent].push(curr);
                    return prev;
                }, {}),
                parents = Object.keys(listOfParents);

            // If parent does not exist, hoist parent to root of tree.
            parents.forEach(function (parent, list) {
                var children = listOfParents[parent];

                if ((parent !== '') && (ids.indexOf(parent) === -1)) {
                    children.forEach(function (child) {
                        list[''].push(child);
                    });
                    delete list[parent];
                }
            });
            return listOfParents;
        };
        var getNode = function (id, parent, level, data, mapOfIdToChildren, options) {
            var descendants = 0,
                height = 0,
                after = options && options.after,
                before = options && options.before,
                node = {
                    data: data,
                    depth: level - 1,
                    id: id,
                    level: level,
                    parent: parent
                },
                start,
                end,
                children;

            // Allow custom logic before the children has been created.
            if (isFunction(before)) {
                before(node, options);
            }

            // Call getNode recursively on the children. Calulate the height of the
            // node, and the number of descendants.
            children = ((mapOfIdToChildren[id] || [])).map(function (child) {
                var node = getNode(
                        child.id,
                        id,
                        (level + 1),
                        child,
                        mapOfIdToChildren,
                        options
                    ),
                    childStart = child.start,
                    childEnd = (
                        child.milestone === true ?
                            childStart :
                            child.end
                    );

                // Start should be the lowest child.start.
                start = (
                    (!isNumber(start) || childStart < start) ?
                        childStart :
                        start
                );

                // End should be the largest child.end.
                // If child is milestone, then use start as end.
                end = (
                    (!isNumber(end) || childEnd > end) ?
                        childEnd :
                        end
                );

                descendants = descendants + 1 + node.descendants;
                height = Math.max(node.height + 1, height);
                return node;
            });

            // Calculate start and end for point if it is not already explicitly set.
            if (data) {
                data.start = pick(data.start, start);
                data.end = pick(data.end, end);
            }

            extend(node, {
                children: children,
                descendants: descendants,
                height: height
            });

            // Allow custom logic after the children has been created.
            if (isFunction(after)) {
                after(node, options);
            }

            return node;
        };
        var getTree = function (data, options) {
            var ids = data.map(function (d) {
                    return d.id;
                }),
                mapOfIdToChildren = getListOfParents(data, ids);

            return getNode('', null, 1, null, mapOfIdToChildren, options);
        };

        var Tree = {
            getListOfParents: getListOfParents,
            getNode: getNode,
            getTree: getTree
        };


        return Tree;
    }(Highcharts));
    var result = (function (H) {

        var extend = H.extend,
            isArray = H.isArray,
            isBoolean = function (x) {
                return typeof x === 'boolean';
            },
            isFn = function (x) {
                return typeof x === 'function';
            },
            isObject = H.isObject,
            isNumber = H.isNumber,
            merge = H.merge,
            pick = H.pick;

        // TODO Combine buildTree and buildNode with setTreeValues
        // TODO Remove logic from Treemap and make it utilize this mixin.
        var setTreeValues = function setTreeValues(tree, options) {
            var before = options.before,
                idRoot = options.idRoot,
                mapIdToNode = options.mapIdToNode,
                nodeRoot = mapIdToNode[idRoot],
                levelIsConstant = (
                    isBoolean(options.levelIsConstant) ?
                        options.levelIsConstant :
                        true
                ),
                points = options.points,
                point = points[tree.i],
                optionsPoint = point && point.options || {},
                childrenTotal = 0,
                children = [],
                value;

            extend(tree, {
                levelDynamic: tree.level - (levelIsConstant ? 0 : nodeRoot.level),
                name: pick(point && point.name, ''),
                visible: (
                    idRoot === tree.id ||
                    (isBoolean(options.visible) ? options.visible : false)
                )
            });
            if (isFn(before)) {
                tree = before(tree, options);
            }
            // First give the children some values
            tree.children.forEach(function (child, i) {
                var newOptions = extend({}, options);

                extend(newOptions, {
                    index: i,
                    siblings: tree.children.length,
                    visible: tree.visible
                });
                child = setTreeValues(child, newOptions);
                children.push(child);
                if (child.visible) {
                    childrenTotal += child.val;
                }
            });
            tree.visible = childrenTotal > 0 || tree.visible;
            // Set the values
            value = pick(optionsPoint.value, childrenTotal);
            extend(tree, {
                children: children,
                childrenTotal: childrenTotal,
                isLeaf: tree.visible && !childrenTotal,
                val: value
            });
            return tree;
        };

        var getColor = function getColor(node, options) {
            var index = options.index,
                mapOptionsToLevel = options.mapOptionsToLevel,
                parentColor = options.parentColor,
                parentColorIndex = options.parentColorIndex,
                series = options.series,
                colors = options.colors,
                siblings = options.siblings,
                points = series.points,
                getColorByPoint,
                chartOptionsChart = series.chart.options.chart,
                point,
                level,
                colorByPoint,
                colorIndexByPoint,
                color,
                colorIndex;

            function variation(color) {
                var colorVariation = level && level.colorVariation;

                if (colorVariation) {
                    if (colorVariation.key === 'brightness') {
                        return H.color(color).brighten(
                            colorVariation.to * (index / siblings)
                        ).get();
                    }
                }

                return color;
            }

            if (node) {
                point = points[node.i];
                level = mapOptionsToLevel[node.level] || {};
                getColorByPoint = point && level.colorByPoint;

                if (getColorByPoint) {
                    colorIndexByPoint = point.index % (colors ?
                        colors.length :
                        chartOptionsChart.colorCount
                    );
                    colorByPoint = colors && colors[colorIndexByPoint];
                }

                // Select either point color, level color or inherited color.
                if (!series.chart.styledMode) {
                    color = pick(
                        point && point.options.color,
                        level && level.color,
                        colorByPoint,
                        parentColor && variation(parentColor),
                        series.color
                    );
                }

                colorIndex = pick(
                    point && point.options.colorIndex,
                    level && level.colorIndex,
                    colorIndexByPoint,
                    parentColorIndex,
                    options.colorIndex
                );
            }
            return {
                color: color,
                colorIndex: colorIndex
            };
        };

        /**
         * Creates a map from level number to its given options.
         *
         * @private
         * @function getLevelOptions
         *
         * @param {object} params
         *        Object containing parameters.
         *        - `defaults` Object containing default options. The default options
         *           are merged with the userOptions to get the final options for a
         *           specific level.
         *        - `from` The lowest level number.
         *        - `levels` User options from series.levels.
         *        - `to` The highest level number.
         *
         * @return {Highcharts.Dictionary<object>}
         *         Returns a map from level number to its given options.
         */
        var getLevelOptions = function getLevelOptions(params) {
            var result = null,
                defaults,
                converted,
                i,
                from,
                to,
                levels;

            if (isObject(params)) {
                result = {};
                from = isNumber(params.from) ? params.from : 1;
                levels = params.levels;
                converted = {};
                defaults = isObject(params.defaults) ? params.defaults : {};
                if (isArray(levels)) {
                    converted = levels.reduce(function (obj, item) {
                        var level,
                            levelIsConstant,
                            options;

                        if (isObject(item) && isNumber(item.level)) {
                            options = merge({}, item);
                            levelIsConstant = (
                                isBoolean(options.levelIsConstant) ?
                                    options.levelIsConstant :
                                    defaults.levelIsConstant
                            );
                            // Delete redundant properties.
                            delete options.levelIsConstant;
                            delete options.level;
                            // Calculate which level these options apply to.
                            level = item.level + (levelIsConstant ? 0 : from - 1);
                            if (isObject(obj[level])) {
                                extend(obj[level], options);
                            } else {
                                obj[level] = options;
                            }
                        }
                        return obj;
                    }, {});
                }
                to = isNumber(params.to) ? params.to : 1;
                for (i = 0; i <= to; i++) {
                    result[i] = merge(
                        {},
                        defaults,
                        isObject(converted[i]) ? converted[i] : {}
                    );
                }
            }
            return result;
        };

        /**
         * Update the rootId property on the series. Also makes sure that it is
         * accessible to exporting.
         *
         * @private
         * @function updateRootId
         *
         * @param {object} series
         *        The series to operate on.
         *
         * @return {string}
         *         Returns the resulting rootId after update.
         */
        var updateRootId = function (series) {
            var rootId,
                options;

            if (isObject(series)) {
                // Get the series options.
                options = isObject(series.options) ? series.options : {};

                // Calculate the rootId.
                rootId = pick(series.rootNode, options.rootId, '');

                // Set rootId on series.userOptions to pick it up in exporting.
                if (isObject(series.userOptions)) {
                    series.userOptions.rootId = rootId;
                }
                // Set rootId on series to pick it up on next update.
                series.rootNode = rootId;
            }
            return rootId;
        };

        var result = {
            getColor: getColor,
            getLevelOptions: getLevelOptions,
            setTreeValues: setTreeValues,
            updateRootId: updateRootId
        };


        return result;
    }(Highcharts));
    (function (H) {
        /**
         * (c) 2009-2019 Torstein Honsi
         *
         * License: www.highcharts.com/license
         */



        var addEvent = H.addEvent,
            pick = H.pick,
            extend = H.extend,
            isArray = H.isArray,
            fireEvent = H.fireEvent,
            Axis = H.Axis,
            Series = H.Series;

        extend(Axis.prototype, {
            isInBreak: function (brk, val) {
                var ret,
                    repeat = brk.repeat || Infinity,
                    from = brk.from,
                    length = brk.to - brk.from,
                    test = (
                        val >= from ?
                            (val - from) % repeat :
                            repeat - ((from - val) % repeat)
                    );

                if (!brk.inclusive) {
                    ret = test < length && test !== 0;
                } else {
                    ret = test <= length;
                }
                return ret;
            },

            isInAnyBreak: function (val, testKeep) {

                var breaks = this.options.breaks,
                    i = breaks && breaks.length,
                    inbrk,
                    keep,
                    ret;


                if (i) {

                    while (i--) {
                        if (this.isInBreak(breaks[i], val)) {
                            inbrk = true;
                            if (!keep) {
                                keep = pick(
                                    breaks[i].showPoints,
                                    !this.isXAxis
                                );
                            }
                        }
                    }

                    if (inbrk && testKeep) {
                        ret = inbrk && !keep;
                    } else {
                        ret = inbrk;
                    }
                }
                return ret;
            }
        });

        addEvent(Axis, 'afterInit', function () {
            if (typeof this.setBreaks === 'function') {
                this.setBreaks(this.options.breaks, false);
            }
        });

        addEvent(Axis, 'afterSetTickPositions', function () {
            if (this.isBroken) {
                var axis = this,
                    tickPositions = this.tickPositions,
                    info = this.tickPositions.info,
                    newPositions = [],
                    i;

                for (i = 0; i < tickPositions.length; i++) {
                    if (!axis.isInAnyBreak(tickPositions[i])) {
                        newPositions.push(tickPositions[i]);
                    }
                }

                this.tickPositions = newPositions;
                this.tickPositions.info = info;
            }
        });

        // Force Axis to be not-ordinal when breaks are defined
        addEvent(Axis, 'afterSetOptions', function () {
            if (this.isBroken) {
                this.options.ordinal = false;
            }
        });

        /**
         * Dynamically set or unset breaks in an axis. This function in lighter than
         * usin Axis.update, and it also preserves animation.
         *
         * @private
         * @function Highcharts.Axis#setBreaks
         *
         * @param {Array<*>} [breaks]
         *        The breaks to add. When `undefined` it removes existing breaks.
         *
         * @param {boolean} [redraw=true]
         *        Whether to redraw the chart immediately.
         */
        Axis.prototype.setBreaks = function (breaks, redraw) {
            var axis = this,
                isBroken = (isArray(breaks) && !!breaks.length);

            function breakVal2Lin(val) {
                var nval = val,
                    brk,
                    i;

                for (i = 0; i < axis.breakArray.length; i++) {
                    brk = axis.breakArray[i];
                    if (brk.to <= val) {
                        nval -= brk.len;
                    } else if (brk.from >= val) {
                        break;
                    } else if (axis.isInBreak(brk, val)) {
                        nval -= (val - brk.from);
                        break;
                    }
                }

                return nval;
            }

            function breakLin2Val(val) {
                var nval = val,
                    brk,
                    i;

                for (i = 0; i < axis.breakArray.length; i++) {
                    brk = axis.breakArray[i];
                    if (brk.from >= nval) {
                        break;
                    } else if (brk.to < nval) {
                        nval += brk.len;
                    } else if (axis.isInBreak(brk, nval)) {
                        nval += brk.len;
                    }
                }
                return nval;
            }


            axis.isDirty = axis.isBroken !== isBroken;
            axis.isBroken = isBroken;
            axis.options.breaks = axis.userOptions.breaks = breaks;
            axis.forceRedraw = true; // Force recalculation in setScale

            if (!isBroken && axis.val2lin === breakVal2Lin) {
                // Revert to prototype functions
                delete axis.val2lin;
                delete axis.lin2val;
            }

            if (isBroken) {
                axis.userOptions.ordinal = false;
                axis.val2lin = breakVal2Lin;
                axis.lin2val = breakLin2Val;

                axis.setExtremes = function (
                    newMin,
                    newMax,
                    redraw,
                    animation,
                    eventArguments
                ) {
                    // If trying to set extremes inside a break, extend it to before and
                    // after the break ( #3857 )
                    if (this.isBroken) {
                        while (this.isInAnyBreak(newMin)) {
                            newMin -= this.closestPointRange;
                        }
                        while (this.isInAnyBreak(newMax)) {
                            newMax -= this.closestPointRange;
                        }
                    }
                    Axis.prototype.setExtremes.call(
                        this,
                        newMin,
                        newMax,
                        redraw,
                        animation,
                        eventArguments
                    );
                };

                axis.setAxisTranslation = function (saveOld) {
                    Axis.prototype.setAxisTranslation.call(this, saveOld);

                    this.unitLength = null;
                    if (this.isBroken) {
                        var breaks = axis.options.breaks,
                            breakArrayT = [], // Temporary one
                            breakArray = [],
                            length = 0,
                            inBrk,
                            repeat,
                            min = axis.userMin || axis.min,
                            max = axis.userMax || axis.max,
                            pointRangePadding = pick(axis.pointRangePadding, 0),
                            start,
                            i;

                        // Min & max check (#4247)
                        breaks.forEach(function (brk) {
                            repeat = brk.repeat || Infinity;
                            if (axis.isInBreak(brk, min)) {
                                min += (brk.to % repeat) - (min % repeat);
                            }
                            if (axis.isInBreak(brk, max)) {
                                max -= (max % repeat) - (brk.from % repeat);
                            }
                        });

                        // Construct an array holding all breaks in the axis
                        breaks.forEach(function (brk) {
                            start = brk.from;
                            repeat = brk.repeat || Infinity;

                            while (start - repeat > min) {
                                start -= repeat;
                            }
                            while (start < min) {
                                start += repeat;
                            }

                            for (i = start; i < max; i += repeat) {
                                breakArrayT.push({
                                    value: i,
                                    move: 'in'
                                });
                                breakArrayT.push({
                                    value: i + (brk.to - brk.from),
                                    move: 'out',
                                    size: brk.breakSize
                                });
                            }
                        });

                        breakArrayT.sort(function (a, b) {
                            return (
                                (a.value === b.value) ?
                                    (
                                        (a.move === 'in' ? 0 : 1) -
                                        (b.move === 'in' ? 0 : 1)
                                    ) :
                                    a.value - b.value
                            );
                        });

                        // Simplify the breaks
                        inBrk = 0;
                        start = min;

                        breakArrayT.forEach(function (brk) {
                            inBrk += (brk.move === 'in' ? 1 : -1);

                            if (inBrk === 1 && brk.move === 'in') {
                                start = brk.value;
                            }
                            if (inBrk === 0) {
                                breakArray.push({
                                    from: start,
                                    to: brk.value,
                                    len: brk.value - start - (brk.size || 0)
                                });
                                length += brk.value - start - (brk.size || 0);
                            }
                        });

                        axis.breakArray = breakArray;

                        // Used with staticScale, and below, the actual axis length when
                        // breaks are substracted.
                        axis.unitLength = max - min - length + pointRangePadding;

                        fireEvent(axis, 'afterBreaks');

                        if (axis.staticScale) {
                            axis.transA = axis.staticScale;
                        } else if (axis.unitLength) {
                            axis.transA *= (max - axis.min + pointRangePadding) /
                                axis.unitLength;
                        }

                        if (pointRangePadding) {
                            axis.minPixelPadding = axis.transA * axis.minPointOffset;
                        }

                        axis.min = min;
                        axis.max = max;
                    }
                };
            }

            if (pick(redraw, true)) {
                this.chart.redraw();
            }
        };

        addEvent(Series, 'afterGeneratePoints', function () {

            var series = this,
                xAxis = series.xAxis,
                yAxis = series.yAxis,
                points = series.points,
                point,
                i = points.length,
                connectNulls = series.options.connectNulls,
                nullGap;


            if (xAxis && yAxis && (xAxis.options.breaks || yAxis.options.breaks)) {
                while (i--) {
                    point = points[i];

                    // Respect nulls inside the break (#4275)
                    nullGap = point.y === null && connectNulls === false;
                    if (
                        !nullGap &&
                        (
                            xAxis.isInAnyBreak(point.x, true) ||
                            yAxis.isInAnyBreak(point.y, true)
                        )
                    ) {
                        points.splice(i, 1);
                        if (this.data[i]) {
                            // Removes the graphics for this point if they exist
                            this.data[i].destroyElements();
                        }
                    }
                }
            }

        });

        addEvent(Series, 'afterRender', function drawPointsWrapped() {
            this.drawBreaks(this.xAxis, ['x']);
            this.drawBreaks(this.yAxis, pick(this.pointArrayMap, ['y']));
        });

        H.Series.prototype.drawBreaks = function (axis, keys) {
            var series = this,
                points = series.points,
                breaks,
                threshold,
                eventName,
                y;

            if (!axis) {
                return; // #5950
            }

            keys.forEach(function (key) {
                breaks = axis.breakArray || [];
                threshold = axis.isXAxis ?
                    axis.min :
                    pick(series.options.threshold, axis.min);
                points.forEach(function (point) {
                    y = pick(point['stack' + key.toUpperCase()], point[key]);
                    breaks.forEach(function (brk) {
                        eventName = false;

                        if (
                            (threshold < brk.from && y > brk.to) ||
                            (threshold > brk.from && y < brk.from)
                        ) {
                            eventName = 'pointBreak';

                        } else if (
                            (threshold < brk.from && y > brk.from && y < brk.to) ||
                            (threshold > brk.from && y > brk.to && y < brk.from)
                        ) {
                            eventName = 'pointInBreak';
                        }
                        if (eventName) {
                            fireEvent(axis, eventName, { point: point, brk: brk });
                        }
                    });
                });
            });
        };


        /**
         * Extend getGraphPath by identifying gaps in the data so that we can draw a gap
         * in the line or area. This was moved from ordinal axis module to broken axis
         * module as of #5045.
         *
         * @private
         * @function Highcharts.Series#gappedPath
         */
        H.Series.prototype.gappedPath = function () {
            var currentDataGrouping = this.currentDataGrouping,
                groupingSize = currentDataGrouping && currentDataGrouping.gapSize,
                gapSize = this.options.gapSize,
                points = this.points.slice(),
                i = points.length - 1,
                yAxis = this.yAxis,
                xRange,
                stack;

            /**
             * Defines when to display a gap in the graph, together with the
             * [gapUnit](plotOptions.series.gapUnit) option.
             *
             * In case when `dataGrouping` is enabled, points can be grouped into a
             * larger time span. This can make the grouped points to have a greater
             * distance than the absolute value of `gapSize` property, which will result
             * in disappearing graph completely. To prevent this situation the mentioned
             * distance between grouped points is used instead of previously defined
             * `gapSize`.
             *
             * In practice, this option is most often used to visualize gaps in
             * time series. In a stock chart, intraday data is available for daytime
             * hours, while gaps will appear in nights and weekends.
             *
             * @see [gapUnit](plotOptions.series.gapUnit)
             * @see [xAxis.breaks](#xAxis.breaks)
             *
             * @sample {highstock} stock/plotoptions/series-gapsize/
             *         Setting the gap size to 2 introduces gaps for weekends in daily
             *         datasets.
             *
             * @type      {number}
             * @default   0
             * @product   highstock
             * @apioption plotOptions.series.gapSize
             */

            /**
             * Together with [gapSize](plotOptions.series.gapSize), this option defines
             * where to draw gaps in the graph.
             *
             * When the `gapUnit` is `relative` (default), a gap size of 5 means
             * that if the distance between two points is greater than five times
             * that of the two closest points, the graph will be broken.
             *
             * When the `gapUnit` is `value`, the gap is based on absolute axis values,
             * which on a datetime axis is milliseconds. This also applies to the
             * navigator series that inherits gap options from the base series.
             *
             * @see [gapSize](plotOptions.series.gapSize)
             *
             * @type       {string}
             * @default    relative
             * @since      5.0.13
             * @product    highstock
             * @validvalue ["relative", "value"]
             * @apioption  plotOptions.series.gapUnit
             */

            if (gapSize && i > 0) { // #5008

                // Gap unit is relative
                if (this.options.gapUnit !== 'value') {
                    gapSize *= this.closestPointRange;
                }

                // Setting a new gapSize in case dataGrouping is enabled (#7686)
                if (groupingSize && groupingSize > gapSize) {
                    gapSize = groupingSize;
                }

                // extension for ordinal breaks
                while (i--) {
                    if (points[i + 1].x - points[i].x > gapSize) {
                        xRange = (points[i].x + points[i + 1].x) / 2;

                        points.splice( // insert after this one
                            i + 1,
                            0,
                            {
                                isNull: true,
                                x: xRange
                            }
                        );

                        // For stacked chart generate empty stack items, #6546
                        if (this.options.stacking) {
                            stack = yAxis.stacks[this.stackKey][xRange] =
                                new H.StackItem(
                                    yAxis,
                                    yAxis.options.stackLabels,
                                    false,
                                    xRange,
                                    this.stack
                                );
                            stack.total = 0;
                        }
                    }
                }
            }

            // Call base method
            return this.getGraphPath(points);
        };

    }(Highcharts));
    (function (H, Tree, mixinTreeSeries) {
        /* *
         * (c) 2016 Highsoft AS
         * Authors: Jon Arild Nygard
         *
         * License: www.highcharts.com/license
         */

        /* eslint no-console: 0 */



        var addEvent = H.addEvent,
            argsToArray = function (args) {
                return Array.prototype.slice.call(args, 1);
            },
            defined = H.defined,
            extend = H.extend,
            find = H.find,
            fireEvent = H.fireEvent,
            getLevelOptions = mixinTreeSeries.getLevelOptions,
            merge = H.merge,
            isBoolean = function (x) {
                return typeof x === 'boolean';
            },
            isNumber = H.isNumber,
            isObject = function (x) {
                // Always use strict mode.
                return H.isObject(x, true);
            },
            isString = H.isString,
            pick = H.pick,
            wrap = H.wrap,
            GridAxis = H.Axis,
            GridAxisTick = H.Tick;

        var override = function (obj, methods) {
            var method,
                func;

            for (method in methods) {
                if (methods.hasOwnProperty(method)) {
                    func = methods[method];
                    wrap(obj, method, func);
                }
            }
        };

        var getBreakFromNode = function (node, max) {
            var from = node.collapseStart,
                to = node.collapseEnd;

            // In broken-axis, the axis.max is minimized until it is not within a break.
            // Therefore, if break.to is larger than axis.max, the axis.to should not
            // add the 0.5 axis.tickMarkOffset, to avoid adding a break larger than
            // axis.max
            // TODO consider simplifying broken-axis and this might solve itself
            if (to >= max) {
                from -= 0.5;
            }

            return {
                from: from,
                to: to,
                showPoints: false
            };
        };

        /**
         * Creates a list of positions for the ticks on the axis. Filters out positions
         * that are outside min and max, or is inside an axis break.
         *
         * @private
         * @function getTickPositions
         *
         * @param {Highcharts.Axis} axis
         *        The Axis to get the tick positions from.
         *
         * @return {Array<number>}
         *         List of positions.
         */
        var getTickPositions = function (axis) {
            return Object.keys(axis.mapOfPosToGridNode).reduce(
                function (arr, key) {
                    var pos = +key;
                    if (
                        axis.min <= pos &&
                        axis.max >= pos &&
                        !axis.isInAnyBreak(pos)
                    ) {
                        arr.push(pos);
                    }
                    return arr;
                },
                []
            );
        };

        /**
         * Check if a node is collapsed.
         *
         * @private
         * @function isCollapsed
         *
         * @param {Highcharts.Axis} axis
         *        The axis to check against.
         *
         * @param {object} node
         *        The node to check if is collapsed.
         *
         * @param {number} pos
         *        The tick position to collapse.
         *
         * @return {boolean}
         *         Returns true if collapsed, false if expanded.
         */
        var isCollapsed = function (axis, node) {
            var breaks = (axis.options.breaks || []),
                obj = getBreakFromNode(node, axis.max);

            return breaks.some(function (b) {
                return b.from === obj.from && b.to === obj.to;
            });
        };

        /**
         * Calculates the new axis breaks to collapse a node.
         *
         * @private
         * @function collapse
         *
         * @param {Highcharts.Axis} axis
         *        The axis to check against.
         *
         * @param {object} node
         *        The node to collapse.
         *
         * @param {number} pos
         *        The tick position to collapse.
         *
         * @return {Array<object>}
         *         Returns an array of the new breaks for the axis.
         */
        var collapse = function (axis, node) {
            var breaks = (axis.options.breaks || []),
                obj = getBreakFromNode(node, axis.max);

            breaks.push(obj);
            return breaks;
        };

        /**
         * Calculates the new axis breaks to expand a node.
         *
         * @private
         * @function expand
         *
         * @param {Highcharts.Axis} axis
         *        The axis to check against.
         *
         * @param {object} node
         *        The node to expand.
         *
         * @param {number} pos
         *        The tick position to expand.
         *
         * @returns {Array<object>} Returns an array of the new breaks for the axis.
         */
        var expand = function (axis, node) {
            var breaks = (axis.options.breaks || []),
                obj = getBreakFromNode(node, axis.max);

            // Remove the break from the axis breaks array.
            return breaks.reduce(function (arr, b) {
                if (b.to !== obj.to || b.from !== obj.from) {
                    arr.push(b);
                }
                return arr;
            }, []);
        };

        /**
         * Calculates the new axis breaks after toggling the collapse/expand state of a
         * node. If it is collapsed it will be expanded, and if it is exapended it will
         * be collapsed.
         *
         * @private
         * @function toggleCollapse
         *
         * @param {Highcharts.Axis} axis
         *        The axis to check against.
         *
         * @param {object} node
         *        The node to toggle.
         *
         * @param {number} pos
         *        The tick position to toggle.
         *
         * @return {Array<object>}
         *         Returns an array of the new breaks for the axis.
         */
        var toggleCollapse = function (axis, node) {
            return (
                isCollapsed(axis, node) ?
                    expand(axis, node) :
                    collapse(axis, node)
            );
        };
        var renderLabelIcon = function (tick, params) {
            var icon = tick.labelIcon,
                isNew = !icon,
                renderer = params.renderer,
                labelBox = params.xy,
                options = params.options,
                width = options.width,
                height = options.height,
                iconCenter = {
                    x: labelBox.x - (width / 2) - options.padding,
                    y: labelBox.y - (height / 2)
                },
                rotation = params.collapsed ? 90 : 180,
                shouldRender = params.show && H.isNumber(iconCenter.y);

            if (isNew) {
                tick.labelIcon = icon = renderer.path(renderer.symbols[options.type](
                    options.x,
                    options.y,
                    width,
                    height
                ))
                    .addClass('highcharts-label-icon')
                    .add(params.group);
            }

            // Set the new position, and show or hide
            if (!shouldRender) {
                icon.attr({ y: -9999 }); // #1338
            }

            // Presentational attributes
            if (!renderer.styledMode) {
                icon
                    .attr({
                        'stroke-width': 1,
                        'fill': pick(params.color, '#666666')
                    })
                    .css({
                        cursor: 'pointer',
                        stroke: options.lineColor,
                        strokeWidth: options.lineWidth
                    });
            }

            // Update the icon positions
            icon[isNew ? 'attr' : 'animate']({
                translateX: iconCenter.x,
                translateY: iconCenter.y,
                rotation: rotation
            });

        };
        var onTickHover = function (label) {
            label.addClass('highcharts-treegrid-node-active');

            if (!label.renderer.styledMode) {
                label.css({
                    textDecoration: 'underline'
                });
            }
        };
        var onTickHoverExit = function (label, options) {
            var css = defined(options.style) ? options.style : {};

            label.removeClass('highcharts-treegrid-node-active');

            if (!label.renderer.styledMode) {
                label.css({
                    textDecoration: css.textDecoration
                });
            }
        };

        /**
         * Builds the tree of categories and calculates its positions.
         *
         * @param {object} e Event object
         * @param {object} e.target The chart instance which the event was fired on.
         * @param {object[]} e.target.axes The axes of the chart.
         */
        var onBeforeRender = function (e) {
            var chart = e.target,
                axes = chart.axes;

            axes
                .filter(function (axis) {
                    return axis.options.type === 'treegrid';
                })
                .forEach(function (axis) {
                    var labelOptions = axis.options && axis.options.labels,
                        removeFoundExtremesEvent;

                    // setScale is fired after all the series is initialized,
                    // which is an ideal time to update the axis.categories.
                    axis.updateYNames();

                    // Update yData now that we have calculated the y values
                    // TODO: it would be better to be able to calculate y values
                    // before Series.setData
                    axis.series.forEach(function (series) {
                        series.yData = series.options.data.map(function (data) {
                            return data.y;
                        });
                    });

                    // Calculate the label options for each level in the tree.
                    axis.mapOptionsToLevel = getLevelOptions({
                        defaults: labelOptions,
                        from: 1,
                        levels: labelOptions.levels,
                        to: axis.tree.height
                    });

                    // Collapse all the nodes belonging to a point where collapsed
                    // equals true.
                    // Can be called from beforeRender, if getBreakFromNode removes
                    // its dependency on axis.max.
                    removeFoundExtremesEvent =
                        H.addEvent(axis, 'foundExtremes', function () {
                            axis.collapsedNodes.forEach(function (node) {
                                var breaks = collapse(axis, node);

                                axis.setBreaks(breaks, false);
                            });
                            removeFoundExtremesEvent();
                        });
                });
        };

        /**
         * Creates a tree structure of the data, and the treegrid. Calculates
         * categories, and y-values of points based on the tree.
         *
         * @private
         * @function getTreeGridFromData
         *
         * @param {Array<*>} data
         *        All the data points to display in the axis.
         *
         * @param {boolean} uniqueNames
         *        Wether or not the data node with the same name should share grid cell.
         *        If true they do share cell. False by default.
         *
         * @return {object}
         *         Returns an object containing categories, mapOfIdToNode,
         *         mapOfPosToGridNode, and tree.
         *
         * @todo There should be only one point per line.
         * @todo It should be optional to have one category per point, or merge cells
         * @todo Add unit-tests.
         */
        var getTreeGridFromData = function (data, uniqueNames, numberOfSeries) {
            var categories = [],
                collapsedNodes = [],
                mapOfIdToNode = {},
                mapOfPosToGridNode = {},
                posIterator = -1,
                uniqueNamesEnabled = isBoolean(uniqueNames) ? uniqueNames : false,
                tree,
                treeParams,
                updateYValuesAndTickPos;

            // Build the tree from the series data.
            treeParams = {
                // After the children has been created.
                after: function (node) {
                    var gridNode = mapOfPosToGridNode[node.pos],
                        height = 0,
                        descendants = 0;

                    gridNode.children.forEach(function (child) {
                        descendants += child.descendants + 1;
                        height = Math.max(child.height + 1, height);
                    });
                    gridNode.descendants = descendants;
                    gridNode.height = height;
                    if (gridNode.collapsed) {
                        collapsedNodes.push(gridNode);
                    }
                },
                // Before the children has been created.
                before: function (node) {
                    var data = isObject(node.data) ? node.data : {},
                        name = isString(data.name) ? data.name : '',
                        parentNode = mapOfIdToNode[node.parent],
                        parentGridNode = (
                            isObject(parentNode) ?
                                mapOfPosToGridNode[parentNode.pos] :
                                null
                        ),
                        hasSameName = function (x) {
                            return x.name === name;
                        },
                        gridNode,
                        pos;

                    // If not unique names, look for a sibling node with the same name.
                    if (
                        uniqueNamesEnabled &&
                        isObject(parentGridNode) &&
                        !!(gridNode = find(parentGridNode.children, hasSameName))
                    ) {
                        // If if there is a gridNode with the same name, reuse position.
                        pos = gridNode.pos;
                        // Add data node to list of nodes in the grid node.
                        gridNode.nodes.push(node);
                    } else {
                        // If it is a new grid node, increment position.
                        pos = posIterator++;
                    }

                    // Add new grid node to map.
                    if (!mapOfPosToGridNode[pos]) {
                        mapOfPosToGridNode[pos] = gridNode = {
                            depth: parentGridNode ? parentGridNode.depth + 1 : 0,
                            name: name,
                            nodes: [node],
                            children: [],
                            pos: pos
                        };

                        // If not root, then add name to categories.
                        if (pos !== -1) {
                            categories.push(name);
                        }

                        // Add name to list of children.
                        if (isObject(parentGridNode)) {
                            parentGridNode.children.push(gridNode);
                        }
                    }

                    // Add data node to map
                    if (isString(node.id)) {
                        mapOfIdToNode[node.id] = node;
                    }

                    // If one of the points are collapsed, then start the grid node in
                    // collapsed state.
                    if (data.collapsed === true) {
                        gridNode.collapsed = true;
                    }

                    // Assign pos to data node
                    node.pos = pos;
                }
            };

            updateYValuesAndTickPos = function (map, numberOfSeries) {
                var setValues = function (gridNode, start, result) {
                    var nodes = gridNode.nodes,
                        end = start + (start === -1 ? 0 : numberOfSeries - 1),
                        diff = (end - start) / 2,
                        padding = 0.5,
                        pos = start + diff;

                    nodes.forEach(function (node) {
                        var data = node.data;

                        if (isObject(data)) {
                            // Update point
                            data.y = start + data.seriesIndex;
                            // Remove the property once used
                            delete data.seriesIndex;
                        }
                        node.pos = pos;
                    });

                    result[pos] = gridNode;

                    gridNode.pos = pos;
                    gridNode.tickmarkOffset = diff + padding;
                    gridNode.collapseStart = end + padding;


                    gridNode.children.forEach(function (child) {
                        setValues(child, end + 1, result);
                        end = child.collapseEnd - padding;
                    });
                    // Set collapseEnd to the end of the last child node.
                    gridNode.collapseEnd = end + padding;

                    return result;
                };

                return setValues(map['-1'], -1, {});
            };

            // Create tree from data
            tree = Tree.getTree(data, treeParams);

            // Update y values of data, and set calculate tick positions.
            mapOfPosToGridNode = updateYValuesAndTickPos(
                mapOfPosToGridNode,
                numberOfSeries
            );

            // Return the resulting data.
            return {
                categories: categories,
                mapOfIdToNode: mapOfIdToNode,
                mapOfPosToGridNode: mapOfPosToGridNode,
                collapsedNodes: collapsedNodes,
                tree: tree
            };
        };

        override(GridAxis.prototype, {
            init: function (proceed, chart, userOptions) {
                var axis = this,
                    isTreeGrid = userOptions.type === 'treegrid';

                // Set default and forced options for TreeGrid
                if (isTreeGrid) {

                    // Add event for updating the categories of a treegrid.
                    // NOTE Preferably these events should be set on the axis.
                    addEvent(chart, 'beforeRender', onBeforeRender);
                    addEvent(chart, 'beforeRedraw', onBeforeRender);

                    userOptions = merge({
                        // Default options
                        grid: {
                            enabled: true
                        },
                        // TODO: add support for align in treegrid.
                        labels: {
                            align: 'left',

                            /**
                            * Set options on specific levels in a tree grid axis. Takes
                            * precedence over labels options.
                            *
                            * @sample {gantt} gantt/treegrid-axis/labels-levels
                            *         Levels on TreeGrid Labels
                            *
                            * @type      {Array<*>}
                            * @product   gantt
                            * @apioption yAxis.labels.levels
                            */
                            levels: [{
                                /**
                                * Specify the level which the options within this object
                                * applies to.
                                *
                                * @sample {gantt} gantt/treegrid-axis/labels-levels
                                *
                                * @type      {number}
                                * @product   gantt
                                * @apioption yAxis.labels.levels.level
                                */
                                level: undefined
                            }, {
                                level: 1,
                                /**
                                 * @type      {Highcharts.CSSObject}
                                 * @product   gantt
                                 * @apioption yAxis.labels.levels.style
                                 */
                                style: {
                                    /** @ignore-option */
                                    fontWeight: 'bold'
                                }
                            }],

                            /**
                             * The symbol for the collapse and expand icon in a
                             * treegrid.
                             *
                             * @product      gantt
                             * @optionparent yAxis.labels.symbol
                             */
                            symbol: {
                                /**
                                 * The symbol type. Points to a definition function in
                                 * the `Highcharts.Renderer.symbols` collection.
                                 *
                                 * @validvalue ["arc", "circle", "diamond", "square", "triangle", "triangle-down"]
                                 */
                                type: 'triangle',
                                x: -5,
                                y: -5,
                                height: 10,
                                width: 10,
                                padding: 5
                            }
                        },
                        uniqueNames: false

                    }, userOptions, { // User options
                        // Forced options
                        reversed: true,
                        // grid.columns is not supported in treegrid
                        grid: {
                            columns: undefined
                        }
                    });
                }

                // Now apply the original function with the original arguments,
                // which are sliced off this function's arguments
                proceed.apply(axis, [chart, userOptions]);
                if (isTreeGrid) {
                    axis.hasNames = true;
                    axis.options.showLastLabel = true;
                }
            },
            /**
             * Override to add indentation to axis.maxLabelDimensions.
             *
             * @private
             * @function Highcharts.GridAxis#getMaxLabelDimensions
             *
             * @param {Function} proceed
             *        The original function
             */
            getMaxLabelDimensions: function (proceed) {
                var axis = this,
                    options = axis.options,
                    labelOptions = options && options.labels,
                    indentation = (
                        labelOptions && isNumber(labelOptions.indentation) ?
                            options.labels.indentation :
                            0
                    ),
                    retVal = proceed.apply(axis, argsToArray(arguments)),
                    isTreeGrid = axis.options.type === 'treegrid',
                    treeDepth;

                if (isTreeGrid && this.mapOfPosToGridNode) {
                    treeDepth = axis.mapOfPosToGridNode[-1].height;
                    retVal.width += indentation * (treeDepth - 1);
                }

                return retVal;
            },
            /**
             * Generates a tick for initial positioning.
             *
             * @private
             * @function Highcharts.GridAxis#generateTick
             *
             * @param {Function} proceed
             *        The original generateTick function.
             *
             * @param {number} pos
             *        The tick position in axis values.
             */
            generateTick: function (proceed, pos) {
                var axis = this,
                    mapOptionsToLevel = (
                        isObject(axis.mapOptionsToLevel) ? axis.mapOptionsToLevel : {}
                    ),
                    isTreeGrid = axis.options.type === 'treegrid',
                    ticks = axis.ticks,
                    tick = ticks[pos],
                    levelOptions,
                    options,
                    gridNode;

                if (isTreeGrid) {
                    gridNode = axis.mapOfPosToGridNode[pos];
                    levelOptions = mapOptionsToLevel[gridNode.depth];

                    if (levelOptions) {
                        options = {
                            labels: levelOptions
                        };
                    }

                    if (!tick) {
                        ticks[pos] = tick =
                            new GridAxisTick(axis, pos, null, undefined, {
                                category: gridNode.name,
                                tickmarkOffset: gridNode.tickmarkOffset,
                                options: options
                            });
                    } else {
                        // update labels depending on tick interval
                        tick.parameters.category = gridNode.name;
                        tick.options = options;
                        tick.addLabel();
                    }
                } else {
                    proceed.apply(axis, argsToArray(arguments));
                }
            },
            /**
             * Set the tick positions, tickInterval, axis min and max.
             *
             * @private
             * @function Highcharts.GridAxis#setTickInterval
             *
             * @param {Function} proceed
             *        The original setTickInterval function.
             */
            setTickInterval: function (proceed) {
                var axis = this,
                    options = axis.options,
                    isTreeGrid = options.type === 'treegrid';

                if (isTreeGrid) {
                    axis.min = pick(axis.userMin, options.min, axis.dataMin);
                    axis.max = pick(axis.userMax, options.max, axis.dataMax);

                    fireEvent(axis, 'foundExtremes');

                    // setAxisTranslation modifies the min and max according to
                    // axis breaks.
                    axis.setAxisTranslation(true);

                    axis.tickmarkOffset = 0.5;
                    axis.tickInterval = 1;
                    axis.tickPositions = this.mapOfPosToGridNode ?
                        getTickPositions(axis) :
                        [];
                } else {
                    proceed.apply(axis, argsToArray(arguments));
                }
            }
        });
        override(GridAxisTick.prototype, {
            getLabelPosition: function (
                proceed,
                x,
                y,
                label,
                horiz,
                labelOptions,
                tickmarkOffset,
                index,
                step
            ) {
                var tick = this,
                    lbOptions = pick(
                        tick.options && tick.options.labels,
                        labelOptions
                    ),
                    pos = tick.pos,
                    axis = tick.axis,
                    options = axis.options,
                    isTreeGrid = options.type === 'treegrid',
                    result = proceed.apply(
                        tick,
                        [x, y, label, horiz, lbOptions, tickmarkOffset, index, step]
                    ),
                    symbolOptions,
                    indentation,
                    mapOfPosToGridNode,
                    node,
                    level;

                if (isTreeGrid) {
                    symbolOptions = (
                        lbOptions && isObject(lbOptions.symbol) ?
                            lbOptions.symbol :
                            {}
                    );
                    indentation = (
                        lbOptions && isNumber(lbOptions.indentation) ?
                            lbOptions.indentation :
                            0
                    );
                    mapOfPosToGridNode = axis.mapOfPosToGridNode;
                    node = mapOfPosToGridNode && mapOfPosToGridNode[pos];
                    level = (node && node.depth) || 1;
                    result.x += (
                        // Add space for symbols
                        ((symbolOptions.width) + (symbolOptions.padding * 2)) +
                        // Apply indentation
                        ((level - 1) * indentation)
                    );
                }

                return result;
            },
            renderLabel: function (proceed) {
                var tick = this,
                    pos = tick.pos,
                    axis = tick.axis,
                    label = tick.label,
                    mapOfPosToGridNode = axis.mapOfPosToGridNode,
                    options = axis.options,
                    labelOptions = pick(
                        tick.options && tick.options.labels,
                        options && options.labels
                    ),
                    symbolOptions = (
                        labelOptions && isObject(labelOptions.symbol) ?
                            labelOptions.symbol :
                            {}
                    ),
                    node = mapOfPosToGridNode && mapOfPosToGridNode[pos],
                    level = node && node.depth,
                    isTreeGrid = options.type === 'treegrid',
                    hasLabel = !!(label && label.element),
                    shouldRender = axis.tickPositions.indexOf(pos) > -1,
                    prefixClassName = 'highcharts-treegrid-node-',
                    collapsed,
                    addClassName,
                    removeClassName,
                    styledMode = axis.chart.styledMode;

                if (isTreeGrid && node) {
                    // Add class name for hierarchical styling.
                    if (hasLabel) {
                        label.addClass(prefixClassName + 'level-' + level);
                    }
                }

                proceed.apply(tick, argsToArray(arguments));

                if (isTreeGrid && node && hasLabel && node.descendants > 0) {
                    collapsed = isCollapsed(axis, node);

                    renderLabelIcon(
                        tick,
                        {
                            color: !styledMode && label.styles.color,
                            collapsed: collapsed,
                            group: label.parentGroup,
                            options: symbolOptions,
                            renderer: label.renderer,
                            show: shouldRender,
                            xy: label.xy
                        }
                    );

                    // Add class name for the node.
                    addClassName = prefixClassName +
                        (collapsed ? 'collapsed' : 'expanded');
                    removeClassName = prefixClassName +
                        (collapsed ? 'expanded' : 'collapsed');

                    label
                        .addClass(addClassName)
                        .removeClass(removeClassName);

                    if (!styledMode) {
                        label.css({
                            cursor: 'pointer'
                        });
                    }

                    // Add events to both label text and icon
                    [label, tick.labelIcon].forEach(function (object) {
                        if (!object.attachedTreeGridEvents) {
                            // On hover
                            H.addEvent(object.element, 'mouseover', function () {
                                onTickHover(label);
                            });

                            // On hover out
                            H.addEvent(object.element, 'mouseout', function () {
                                onTickHoverExit(label, labelOptions);
                            });

                            H.addEvent(object.element, 'click', function () {
                                tick.toggleCollapse();
                            });
                            object.attachedTreeGridEvents = true;
                        }
                    });
                }
            }
        });

        extend(GridAxisTick.prototype, /** @lends Highcharts.Tick.prototype */{

            /**
             * Collapse the grid cell. Used when axis is of type treegrid.
             *
             * @see gantt/treegrid-axis/collapsed-dynamically/demo.js
             *
             * @private
             * @function Highcharts.GridAxisTick#collapse
             *
             * @param {boolean} [redraw=true]
             *        Whether to redraw the chart or wait for an explicit call to
             *        {@link Highcharts.Chart#redraw}
             */
            collapse: function (redraw) {
                var tick = this,
                    axis = tick.axis,
                    pos = tick.pos,
                    node = axis.mapOfPosToGridNode[pos],
                    breaks = collapse(axis, node);

                axis.setBreaks(breaks, pick(redraw, true));
            },
            /**
             * Expand the grid cell. Used when axis is of type treegrid.
             *
             * @see gantt/treegrid-axis/collapsed-dynamically/demo.js
             *
             * @private
             * @function Highcharts.GridAxisTick#expand
             *
             * @param {boolean} [redraw=true]
             *        Whether to redraw the chart or wait for an explicit call to
             *        {@link Highcharts.Chart#redraw}
             */
            expand: function (redraw) {
                var tick = this,
                    axis = tick.axis,
                    pos = tick.pos,
                    node = axis.mapOfPosToGridNode[pos],
                    breaks = expand(axis, node);

                axis.setBreaks(breaks, pick(redraw, true));
            },
            /**
             * Toggle the collapse/expand state of the grid cell. Used when axis is of
             * type treegrid.
             *
             * @see gantt/treegrid-axis/collapsed-dynamically/demo.js
             *
             * @private
             * @function Highcharts.GridAxisTick#toggleCollapse
             *
             * @param {boolean} [redraw=true]
             *        Whether to redraw the chart or wait for an explicit call to
             *        {@link Highcharts.Chart#redraw}
             */
            toggleCollapse: function (redraw) {
                var tick = this,
                    axis = tick.axis,
                    pos = tick.pos,
                    node = axis.mapOfPosToGridNode[pos],
                    breaks = toggleCollapse(axis, node);

                axis.setBreaks(breaks, pick(redraw, true));
            }
        });

        GridAxis.prototype.updateYNames = function () {
            var axis = this,
                options = axis.options,
                isTreeGrid = options.type === 'treegrid',
                uniqueNames = options.uniqueNames,
                isYAxis = !axis.isXAxis,
                series = axis.series,
                numberOfSeries = 0,
                treeGrid,
                data;

            if (isTreeGrid && isYAxis) {
                // Concatenate data from all series assigned to this axis.
                data = series.reduce(function (arr, s) {
                    if (s.visible) {
                        // Push all data to array
                        s.options.data.forEach(function (data) {
                            if (isObject(data)) {
                                // Set series index on data. Removed again after use.
                                data.seriesIndex = numberOfSeries;
                                arr.push(data);
                            }
                        });

                        // Increment series index
                        if (uniqueNames === true) {
                            numberOfSeries++;
                        }
                    }
                    return arr;
                }, []);

                // Calculate categories and the hierarchy for the grid.
                treeGrid = getTreeGridFromData(
                    data,
                    uniqueNames,
                    (uniqueNames === true) ? numberOfSeries : 1
                );

                // Assign values to the axis.
                axis.categories = treeGrid.categories;
                axis.mapOfPosToGridNode = treeGrid.mapOfPosToGridNode;
                // Used on init to start a node as collapsed
                axis.collapsedNodes = treeGrid.collapsedNodes;
                axis.hasNames = true;
                axis.tree = treeGrid.tree;
            }
        };

        // Make utility functions available for testing.
        GridAxis.prototype.utils = {
            getNode: Tree.getNode
        };

    }(Highcharts, Tree, result));
    return (function () {


    }());
}));
