/**
 * @license Highcharts JS v7.1.1 (2019-04-09)
 *
 * GridAxis
 *
 * (c) 2016-2019 Lars A. V. Cabrera
 *
 * 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('highcharts/modules/grid-axis', ['highcharts'], function (Highcharts) {
            factory(Highcharts);
            factory.Highcharts = Highcharts;
            return factory;
        });
    } else {
        factory(typeof Highcharts !== 'undefined' ? Highcharts : undefined);
    }
}(function (Highcharts) {
    var _modules = Highcharts ? Highcharts._modules : {};
    function _registerModule(obj, path, args, fn) {
        if (!obj.hasOwnProperty(path)) {
            obj[path] = fn.apply(null, args);
        }
    }
    _registerModule(_modules, 'parts-gantt/GridAxis.js', [_modules['parts/Globals.js']], 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.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'.
        H.dateFormats.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);
                }
            }
        });

    });
    _registerModule(_modules, 'masters/modules/grid-axis.src.js', [], function () {


    });
}));
