wwbsr/node_modules/highcharts/modules/series-label.src.js

/**
 * @license Highcharts JS v8.2.0 (2020-08-20)
 *
 * (c) 2009-2019 Torstein Honsi
 *
 * 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/series-label', ['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, 'Extensions/SeriesLabel.js', [_modules['Core/Chart/Chart.js'], _modules['Core/Globals.js'], _modules['Core/Renderer/SVG/SVGRenderer.js'], _modules['Core/Utilities.js']], function (Chart, H, SVGRenderer, U) {
        /* *
         *
         *  (c) 2009-2020 Torstein Honsi
         *
         *  License: www.highcharts.com/license
         *
         *  !!!!!!! SOURCE GETS TRANSPILED BY TYPESCRIPT. EDIT TS FILE ONLY. !!!!!!!
         *
         * */
        var addEvent = U.addEvent,
            animObject = U.animObject,
            extend = U.extend,
            fireEvent = U.fireEvent,
            format = U.format,
            isNumber = U.isNumber,
            pick = U.pick,
            setOptions = U.setOptions,
            syncTimeout = U.syncTimeout;
        /**
         * Containing the position of a box that should be avoided by labels.
         *
         * @interface Highcharts.LabelIntersectBoxObject
         */ /**
        * @name Highcharts.LabelIntersectBoxObject#bottom
        * @type {number}
        */ /**
        * @name Highcharts.LabelIntersectBoxObject#left
        * @type {number}
        */ /**
        * @name Highcharts.LabelIntersectBoxObject#right
        * @type {number}
        */ /**
        * @name Highcharts.LabelIntersectBoxObject#top
        * @type {number}
        */
        /*
         * Highcharts module to place labels next to a series in a natural position.
         *
         * TODO:
         * - add column support (box collision detection, boxesToAvoid logic)
         * - avoid data labels, when data labels above, show series label below.
         * - add more options (connector, format, formatter)
         *
         * https://jsfiddle.net/highcharts/L2u9rpwr/
         * https://jsfiddle.net/highcharts/y5A37/
         * https://jsfiddle.net/highcharts/264Nm/
         * https://jsfiddle.net/highcharts/y5A37/
         */
        ''; // detach doclets above
        var labelDistance = 3,
            Series = H.Series;
        setOptions({
            /**
             * @optionparent plotOptions
             *
             * @private
             */
            plotOptions: {
                series: {
                    /**
                     * Series labels are placed as close to the series as possible in a
                     * natural way, seeking to avoid other series. The goal of this
                     * feature is to make the chart more easily readable, like if a
                     * human designer placed the labels in the optimal position.
                     *
                     * The series labels currently work with series types having a
                     * `graph` or an `area`.
                     *
                     * @sample highcharts/series-label/line-chart
                     *         Line chart
                     * @sample highcharts/demo/streamgraph
                     *         Stream graph
                     * @sample highcharts/series-label/stock-chart
                     *         Stock chart
                     *
                     * @declare  Highcharts.SeriesLabelOptionsObject
                     * @since    6.0.0
                     * @product  highcharts highstock gantt
                     * @requires modules/series-label
                     */
                    label: {
                        /**
                         * Enable the series label per series.
                         */
                        enabled: true,
                        /**
                         * Allow labels to be placed distant to the graph if necessary,
                         * and draw a connector line to the graph. Setting this option
                         * to true may decrease the performance significantly, since the
                         * algorithm with systematically search for open spaces in the
                         * whole plot area. Visually, it may also result in a more
                         * cluttered chart, though more of the series will be labeled.
                         */
                        connectorAllowed: false,
                        /**
                         * If the label is closer than this to a neighbour graph, draw a
                         * connector.
                         */
                        connectorNeighbourDistance: 24,
                        /**
                         * A format string for the label, with support for a subset of
                         * HTML. Variables are enclosed by curly brackets. Available
                         * variables are `name`, `options.xxx`, `color` and other
                         * members from the `series` object. Use this option also to set
                         * a static text for the label.
                         *
                         * @type string
                         * @since 8.1.0
                         */
                        format: void 0,
                        /**
                         * Callback function to format each of the series' labels. The
                         * `this` keyword refers to the series object. By default the
                         * `formatter` is undefined and the `series.name` is rendered.
                         *
                         * @type {Highcharts.FormatterCallbackFunction<Series>}
                         * @since 8.1.0
                         */
                        formatter: void 0,
                        /**
                         * For area-like series, allow the font size to vary so that
                         * small areas get a smaller font size. The default applies this
                         * effect to area-like series but not line-like series.
                         *
                         * @type {number|null}
                         */
                        minFontSize: null,
                        /**
                         * For area-like series, allow the font size to vary so that
                         * small areas get a smaller font size. The default applies this
                         * effect to area-like series but not line-like series.
                         *
                         * @type {number|null}
                         */
                        maxFontSize: null,
                        /**
                         * Draw the label on the area of an area series. By default it
                         * is drawn on the area. Set it to `false` to draw it next to
                         * the graph instead.
                         *
                         * @type {boolean|null}
                         */
                        onArea: null,
                        /**
                         * Styles for the series label. The color defaults to the series
                         * color, or a contrast color if `onArea`.
                         *
                         * @type {Highcharts.CSSObject}
                         */
                        style: {
                            /** @internal */
                            fontWeight: 'bold'
                        },
                        /**
                         * An array of boxes to avoid when laying out the labels. Each
                         * item has a `left`, `right`, `top` and `bottom` property.
                         *
                         * @type {Array<Highcharts.LabelIntersectBoxObject>}
                         */
                        boxesToAvoid: []
                    }
                }
            }
        });
        /* eslint-disable valid-jsdoc */
        /**
         * Counter-clockwise, part of the fast line intersection logic.
         *
         * @private
         * @function ccw
         */
        function ccw(x1, y1, x2, y2, x3, y3) {
            var cw = ((y3 - y1) * (x2 - x1)) - ((y2 - y1) * (x3 - x1));
            return cw > 0 ? true : !(cw < 0);
        }
        /**
         * Detect if two lines intersect.
         *
         * @private
         * @function intersectLine
         */
        function intersectLine(x1, y1, x2, y2, x3, y3, x4, y4) {
            return ccw(x1, y1, x3, y3, x4, y4) !== ccw(x2, y2, x3, y3, x4, y4) &&
                ccw(x1, y1, x2, y2, x3, y3) !== ccw(x1, y1, x2, y2, x4, y4);
        }
        /**
         * Detect if a box intersects with a line.
         *
         * @private
         * @function boxIntersectLine
         */
        function boxIntersectLine(x, y, w, h, x1, y1, x2, y2) {
            return (intersectLine(x, y, x + w, y, x1, y1, x2, y2) || // top of label
                intersectLine(x + w, y, x + w, y + h, x1, y1, x2, y2) || // right
                intersectLine(x, y + h, x + w, y + h, x1, y1, x2, y2) || // bottom
                intersectLine(x, y, x, y + h, x1, y1, x2, y2) // left of label
            );
        }
        /**
         * General symbol definition for labels with connector.
         *
         * @private
         * @function Highcharts.SVGRenderer#symbols.connector
         */
        SVGRenderer.prototype.symbols.connector = function (x, y, w, h, options) {
            var anchorX = options && options.anchorX,
                anchorY = options && options.anchorY,
                path,
                yOffset,
                lateral = w / 2;
            if (isNumber(anchorX) && isNumber(anchorY)) {
                path = [['M', anchorX, anchorY]];
                // Prefer 45 deg connectors
                yOffset = y - anchorY;
                if (yOffset < 0) {
                    yOffset = -h - yOffset;
                }
                if (yOffset < w) {
                    lateral = anchorX < x + (w / 2) ? yOffset : w - yOffset;
                }
                // Anchor below label
                if (anchorY > y + h) {
                    path.push(['L', x + lateral, y + h]);
                    // Anchor above label
                }
                else if (anchorY < y) {
                    path.push(['L', x + lateral, y]);
                    // Anchor left of label
                }
                else if (anchorX < x) {
                    path.push(['L', x, y + h / 2]);
                    // Anchor right of label
                }
                else if (anchorX > x + w) {
                    path.push(['L', x + w, y + h / 2]);
                }
            }
            return path || [];
        };
        /**
         * Points to avoid. In addition to actual data points, the label should avoid
         * interpolated positions.
         *
         * @private
         * @function Highcharts.Series#getPointsOnGraph
         */
        Series.prototype.getPointsOnGraph = function () {
            if (!this.xAxis && !this.yAxis) {
                return;
            }
            var distance = 16,
                points = this.points,
                point,
                last,
                interpolated = [],
                i,
                deltaX,
                deltaY,
                delta,
                len,
                n,
                j,
                d,
                graph = this.graph || this.area,
                node = graph.element,
                inverted = this.chart.inverted,
                xAxis = this.xAxis,
                yAxis = this.yAxis,
                paneLeft = inverted ? yAxis.pos : xAxis.pos,
                paneTop = inverted ? xAxis.pos : yAxis.pos,
                onArea = pick(this.options.label.onArea, !!this.area),
                translatedThreshold = yAxis.getThreshold(this.options.threshold),
                grid = {};
            /**
             * Push the point to the interpolated points, but only if that position in
             * the grid has not been occupied. As a performance optimization, we divide
             * the plot area into a grid and only add one point per series (#9815).
             * @private
             */
            function pushDiscrete(point) {
                var cellSize = 8, key = Math.round(point.plotX / cellSize) + ',' +
                        Math.round(point.plotY / cellSize);
                if (!grid[key]) {
                    grid[key] = 1;
                    interpolated.push(point);
                }
            }
            // For splines, get the point at length (possible caveat: peaks are not
            // correctly detected)
            if (this.getPointSpline &&
                node.getPointAtLength &&
                !onArea &&
                // Not performing well on complex series, node.getPointAtLength is too
                // heavy (#9815)
                points.length < this.chart.plotSizeX / distance) {
                // If it is animating towards a path definition, use that briefly, and
                // reset
                if (graph.toD) {
                    d = graph.attr('d');
                    graph.attr({ d: graph.toD });
                }
                len = node.getTotalLength();
                for (i = 0; i < len; i += distance) {
                    point = node.getPointAtLength(i);
                    pushDiscrete({
                        chartX: paneLeft + point.x,
                        chartY: paneTop + point.y,
                        plotX: point.x,
                        plotY: point.y
                    });
                }
                if (d) {
                    graph.attr({ d: d });
                }
                // Last point
                point = points[points.length - 1];
                point.chartX = paneLeft + point.plotX;
                point.chartY = paneTop + point.plotY;
                pushDiscrete(point);
                // Interpolate
            }
            else {
                len = points.length;
                for (i = 0; i < len; i += 1) {
                    point = points[i];
                    last = points[i - 1];
                    // Absolute coordinates so we can compare different panes
                    point.chartX = paneLeft + point.plotX;
                    point.chartY = paneTop + point.plotY;
                    if (onArea) {
                        // Vertically centered inside area
                        point.chartCenterY = paneTop + (point.plotY +
                            pick(point.yBottom, translatedThreshold)) / 2;
                    }
                    // Add interpolated points
                    if (i > 0) {
                        deltaX = Math.abs(point.chartX - last.chartX);
                        deltaY = Math.abs(point.chartY - last.chartY);
                        delta = Math.max(deltaX, deltaY);
                        if (delta > distance) {
                            n = Math.ceil(delta / distance);
                            for (j = 1; j < n; j += 1) {
                                pushDiscrete({
                                    chartX: last.chartX +
                                        (point.chartX - last.chartX) *
                                            (j / n),
                                    chartY: last.chartY +
                                        (point.chartY - last.chartY) *
                                            (j / n),
                                    chartCenterY: last.chartCenterY +
                                        (point.chartCenterY -
                                            last.chartCenterY) * (j / n),
                                    plotX: last.plotX +
                                        (point.plotX - last.plotX) *
                                            (j / n),
                                    plotY: last.plotY +
                                        (point.plotY - last.plotY) *
                                            (j / n)
                                });
                            }
                        }
                    }
                    // Add the real point in order to find positive and negative peaks
                    if (isNumber(point.plotY)) {
                        pushDiscrete(point);
                    }
                }
            }
            // Get the bounding box so we can do a quick check first if the bounding
            // boxes overlap.
            /*
            interpolated.bBox = node.getBBox();
            interpolated.bBox.x += paneLeft;
            interpolated.bBox.y += paneTop;
            */
            return interpolated;
        };
        /**
         * Overridable function to return series-specific font sizes for the labels. By
         * default it returns bigger font sizes for series with the greater sum of y
         * values.
         *
         * @private
         * @function Highcharts.Series#labelFontSize
         */
        Series.prototype.labelFontSize = function (minFontSize, maxFontSize) {
            return minFontSize + ((this.sum / this.chart.labelSeriesMaxSum) *
                (maxFontSize - minFontSize)) + 'px';
        };
        /**
         * Check whether a proposed label position is clear of other elements.
         *
         * @private
         * @function Highcharts.Series#checkClearPoint
         */
        Series.prototype.checkClearPoint = function (x, y, bBox, checkDistance) {
            var distToOthersSquared = Number.MAX_VALUE, // distance to other graphs
                distToPointSquared = Number.MAX_VALUE,
                dist,
                connectorPoint,
                onArea = pick(this.options.label.onArea, !!this.area),
                findDistanceToOthers = (onArea || this.options.label.connectorAllowed),
                chart = this.chart,
                series,
                points,
                leastDistance = 16,
                withinRange,
                xDist,
                yDist,
                i,
                j;
            /**
             * @private
             */
            function intersectRect(r1, r2) {
                return !(r2.left > r1.right ||
                    r2.right < r1.left ||
                    r2.top > r1.bottom ||
                    r2.bottom < r1.top);
            }
            /**
             * Get the weight in order to determine the ideal position. Larger distance
             * to other series gives more weight. Smaller distance to the actual point
             * (connector points only) gives more weight.
             * @private
             */
            function getWeight(distToOthersSquared, distToPointSquared) {
                return distToOthersSquared - distToPointSquared;
            }
            // First check for collision with existing labels
            for (i = 0; i < chart.boxesToAvoid.length; i += 1) {
                if (intersectRect(chart.boxesToAvoid[i], {
                    left: x,
                    right: x + bBox.width,
                    top: y,
                    bottom: y + bBox.height
                })) {
                    return false;
                }
            }
            // For each position, check if the lines around the label intersect with any
            // of the graphs.
            for (i = 0; i < chart.series.length; i += 1) {
                series = chart.series[i];
                points = series.interpolatedPoints;
                if (series.visible && points) {
                    for (j = 1; j < points.length; j += 1) {
                        if (
                        // To avoid processing, only check intersection if the X
                        // values are close to the box.
                        points[j].chartX >= x - leastDistance &&
                            points[j - 1].chartX <= x + bBox.width +
                                leastDistance
                        /* @todo condition above is not the same as below
                        (
                            (points[j].chartX as any) >=
                            (x - leastDistance)
                        ) && (
                            (points[j - 1].chartX as any) <=
                            (x + bBox.width + leastDistance)
                        ) */
                        ) {
                            // If any of the box sides intersect with the line, return.
                            if (boxIntersectLine(x, y, bBox.width, bBox.height, points[j - 1].chartX, points[j - 1].chartY, points[j].chartX, points[j].chartY)) {
                                return false;
                            }
                            // But if it is too far away (a padded box doesn't
                            // intersect), also return.
                            if (this === series && !withinRange && checkDistance) {
                                withinRange = boxIntersectLine(x - leastDistance, y - leastDistance, bBox.width + 2 * leastDistance, bBox.height + 2 * leastDistance, points[j - 1].chartX, points[j - 1].chartY, points[j].chartX, points[j].chartY);
                            }
                        }
                        // Find the squared distance from the center of the label. On
                        // area series, avoid its own graph.
                        if ((findDistanceToOthers || withinRange) &&
                            (this !== series || onArea)) {
                            xDist = x + bBox.width / 2 - points[j].chartX;
                            yDist = y + bBox.height / 2 - points[j].chartY;
                            distToOthersSquared = Math.min(distToOthersSquared, xDist * xDist + yDist * yDist);
                        }
                    }
                    // Do we need a connector?
                    if (!onArea &&
                        findDistanceToOthers &&
                        this === series &&
                        ((checkDistance && !withinRange) ||
                            distToOthersSquared < Math.pow(this.options.label.connectorNeighbourDistance, 2))) {
                        for (j = 1; j < points.length; j += 1) {
                            dist = Math.min((Math.pow(x + bBox.width / 2 - points[j].chartX, 2) +
                                Math.pow(y + bBox.height / 2 - points[j].chartY, 2)), (Math.pow(x - points[j].chartX, 2) +
                                Math.pow(y - points[j].chartY, 2)), (Math.pow(x + bBox.width - points[j].chartX, 2) +
                                Math.pow(y - points[j].chartY, 2)), (Math.pow(x + bBox.width - points[j].chartX, 2) +
                                Math.pow(y + bBox.height - points[j].chartY, 2)), (Math.pow(x - points[j].chartX, 2) +
                                Math.pow(y + bBox.height - points[j].chartY, 2)));
                            if (dist < distToPointSquared) {
                                distToPointSquared = dist;
                                connectorPoint = points[j];
                            }
                        }
                        withinRange = true;
                    }
                }
            }
            return !checkDistance || withinRange ? {
                x: x,
                y: y,
                weight: getWeight(distToOthersSquared, connectorPoint ? distToPointSquared : 0),
                connectorPoint: connectorPoint
            } : false;
        };
        /**
         * The main initialize method that runs on chart level after initialization and
         * redraw. It runs in  a timeout to prevent locking, and loops over all series,
         * taking all series and labels into account when placing the labels.
         *
         * @private
         * @function Highcharts.Chart#drawSeriesLabels
         */
        Chart.prototype.drawSeriesLabels = function () {
            // console.time('drawSeriesLabels');
            var chart = this,
                labelSeries = this.labelSeries;
            chart.boxesToAvoid = [];
            // Build the interpolated points
            labelSeries.forEach(function (series) {
                series.interpolatedPoints = series.getPointsOnGraph();
                (series.options.label.boxesToAvoid || []).forEach(function (box) {
                    chart.boxesToAvoid.push(box);
                });
            });
            chart.series.forEach(function (series) {
                var labelOptions = series.options.label;
                if (!labelOptions || (!series.xAxis && !series.yAxis)) {
                    return;
                }
                var bBox, x, y, results = [], clearPoint, i, best, inverted = chart.inverted, paneLeft = (inverted ? series.yAxis.pos : series.xAxis.pos), paneTop = (inverted ? series.xAxis.pos : series.yAxis.pos), paneWidth = chart.inverted ? series.yAxis.len : series.xAxis.len, paneHeight = chart.inverted ? series.xAxis.len : series.yAxis.len, points = series.interpolatedPoints, onArea = pick(labelOptions.onArea, !!series.area), label = series.labelBySeries, isNew = !label, minFontSize = labelOptions.minFontSize, maxFontSize = labelOptions.maxFontSize, dataExtremes, areaMin, areaMax, colorClass = 'highcharts-color-' + pick(series.colorIndex, 'none');
                // Stay within the area data bounds (#10038)
                if (onArea && !inverted) {
                    dataExtremes = [
                        series.xAxis.toPixels(series.xData[0]),
                        series.xAxis.toPixels(series.xData[series.xData.length - 1])
                    ];
                    areaMin = Math.min.apply(Math, dataExtremes);
                    areaMax = Math.max.apply(Math, dataExtremes);
                }
                /**
                 * @private
                 */
                function insidePane(x, y, bBox) {
                    var leftBound = Math.max(paneLeft,
                        pick(areaMin, -Infinity)),
                        rightBound = Math.min(paneLeft + paneWidth,
                        pick(areaMax,
                        Infinity));
                    return (x > leftBound &&
                        x <= rightBound - bBox.width &&
                        y >= paneTop &&
                        y <= paneTop + paneHeight - bBox.height);
                }
                /**
                 * @private
                 */
                function destroyLabel() {
                    if (label) {
                        series.labelBySeries = label.destroy();
                    }
                }
                if (series.visible && !series.isSeriesBoosting && points) {
                    if (!label) {
                        var labelText = series.name;
                        if (typeof labelOptions.format === 'string') {
                            labelText = format(labelOptions.format, series, chart);
                        }
                        else if (labelOptions.formatter) {
                            labelText = labelOptions.formatter.call(series);
                        }
                        series.labelBySeries = label = chart.renderer
                            .label(labelText, 0, -9999, 'connector')
                            .addClass('highcharts-series-label ' +
                            'highcharts-series-label-' + series.index + ' ' +
                            (series.options.className || '') + ' ' +
                            colorClass);
                        if (!chart.renderer.styledMode) {
                            label.css(extend({
                                color: onArea ?
                                    chart.renderer.getContrast(series.color) :
                                    series.color
                            }, labelOptions.style || {}));
                            label.attr({
                                opacity: chart.renderer.forExport ? 1 : 0,
                                stroke: series.color,
                                'stroke-width': 1
                            });
                        }
                        // Adapt label sizes to the sum of the data
                        if (minFontSize && maxFontSize) {
                            label.css({
                                fontSize: series.labelFontSize(minFontSize, maxFontSize)
                            });
                        }
                        label
                            .attr({
                            padding: 0,
                            zIndex: 3
                        })
                            .add();
                    }
                    bBox = label.getBBox();
                    bBox.width = Math.round(bBox.width);
                    // Ideal positions are centered above or below a point on right side
                    // of chart
                    for (i = points.length - 1; i > 0; i -= 1) {
                        if (onArea) {
                            // Centered
                            x = points[i].chartX - bBox.width / 2;
                            y = points[i].chartCenterY - bBox.height / 2;
                            if (insidePane(x, y, bBox)) {
                                best = series.checkClearPoint(x, y, bBox);
                            }
                            if (best) {
                                results.push(best);
                            }
                        }
                        else {
                            // Right - up
                            x = points[i].chartX + labelDistance;
                            y = points[i].chartY - bBox.height - labelDistance;
                            if (insidePane(x, y, bBox)) {
                                best = series.checkClearPoint(x, y, bBox, true);
                            }
                            if (best) {
                                results.push(best);
                            }
                            // Right - down
                            x = points[i].chartX + labelDistance;
                            y = points[i].chartY + labelDistance;
                            if (insidePane(x, y, bBox)) {
                                best = series.checkClearPoint(x, y, bBox, true);
                            }
                            if (best) {
                                results.push(best);
                            }
                            // Left - down
                            x = points[i].chartX - bBox.width - labelDistance;
                            y = points[i].chartY + labelDistance;
                            if (insidePane(x, y, bBox)) {
                                best = series.checkClearPoint(x, y, bBox, true);
                            }
                            if (best) {
                                results.push(best);
                            }
                            // Left - up
                            x = points[i].chartX - bBox.width - labelDistance;
                            y = points[i].chartY - bBox.height - labelDistance;
                            if (insidePane(x, y, bBox)) {
                                best = series.checkClearPoint(x, y, bBox, true);
                            }
                            if (best) {
                                results.push(best);
                            }
                        }
                    }
                    // Brute force, try all positions on the chart in a 16x16 grid
                    if (labelOptions.connectorAllowed && !results.length && !onArea) {
                        for (x = paneLeft + paneWidth - bBox.width; x >= paneLeft; x -= 16) {
                            for (y = paneTop; y < paneTop + paneHeight - bBox.height; y += 16) {
                                clearPoint = series.checkClearPoint(x, y, bBox, true);
                                if (clearPoint) {
                                    results.push(clearPoint);
                                }
                            }
                        }
                    }
                    if (results.length) {
                        results.sort(function (a, b) {
                            return b.weight - a.weight;
                        });
                        best = results[0];
                        chart.boxesToAvoid.push({
                            left: best.x,
                            right: best.x + bBox.width,
                            top: best.y,
                            bottom: best.y + bBox.height
                        });
                        // Move it if needed
                        var dist = Math.sqrt(Math.pow(Math.abs(best.x - (label.x || 0)), 2) +
                                Math.pow(Math.abs(best.y - (label.y || 0)), 2));
                        if (dist && series.labelBySeries) {
                            // Move fast and fade in - pure animation movement is
                            // distractive...
                            var attr = {
                                    opacity: chart.renderer.forExport ? 1 : 0,
                                    x: best.x,
                                    y: best.y
                                },
                                anim = {
                                    opacity: 1
                                };
                            // ... unless we're just moving a short distance
                            if (dist <= 10) {
                                anim = {
                                    x: attr.x,
                                    y: attr.y
                                };
                                attr = {};
                            }
                            // Default initial animation to a fraction of the series
                            // animation (#9396)
                            var animationOptions = void 0;
                            if (isNew) {
                                animationOptions = animObject(series.options.animation);
                                // @todo: Safely remove any cast after merging #13005
                                animationOptions.duration *= 0.2;
                            }
                            series.labelBySeries
                                .attr(extend(attr, {
                                anchorX: best.connectorPoint &&
                                    best.connectorPoint.plotX + paneLeft,
                                anchorY: best.connectorPoint &&
                                    best.connectorPoint.plotY + paneTop
                            }))
                                .animate(anim, animationOptions);
                            // Record closest point to stick to for sync redraw
                            series.options.kdNow = true;
                            series.buildKDTree();
                            var closest = series.searchPoint({
                                    chartX: best.x,
                                    chartY: best.y
                                },
                                true);
                            if (closest) {
                                label.closest = [
                                    closest,
                                    best.x - (closest.plotX || 0),
                                    best.y - (closest.plotY || 0)
                                ];
                            }
                        }
                    }
                    else {
                        destroyLabel();
                    }
                }
                else {
                    destroyLabel();
                }
            });
            fireEvent(chart, 'afterDrawSeriesLabels');
            // console.timeEnd('drawSeriesLabels');
        };
        /* eslint-disable no-invalid-this */
        /**
         * Prepare drawing series labels.
         *
         * @private
         * @function drawLabels
         */
        function drawLabels(e) {
            if (this.renderer) {
                var chart = this,
                    delay = animObject(chart.renderer.globalAnimation).duration;
                chart.labelSeries = [];
                chart.labelSeriesMaxSum = 0;
                U.clearTimeout(chart.seriesLabelTimer);
                // Which series should have labels
                chart.series.forEach(function (series) {
                    var options = series.options.label,
                        label = series.labelBySeries,
                        closest = label && label.closest;
                    if (options.enabled &&
                        series.visible &&
                        (series.graph || series.area) &&
                        !series.isSeriesBoosting) {
                        chart.labelSeries.push(series);
                        if (options.minFontSize && options.maxFontSize) {
                            series.sum = series.yData.reduce(function (pv, cv) {
                                return (pv || 0) + (cv || 0);
                            }, 0);
                            chart.labelSeriesMaxSum = Math.max(chart.labelSeriesMaxSum, series.sum);
                        }
                        // The labels are processing heavy, wait until the animation is
                        // done
                        if (e.type === 'load') {
                            delay = Math.max(delay, animObject(series.options.animation).duration);
                        }
                        // Keep the position updated to the axis while redrawing
                        if (closest) {
                            if (typeof closest[0].plotX !== 'undefined') {
                                label.animate({
                                    x: closest[0].plotX + closest[1],
                                    y: closest[0].plotY + closest[2]
                                });
                            }
                            else {
                                label.attr({ opacity: 0 });
                            }
                        }
                    }
                });
                chart.seriesLabelTimer = syncTimeout(function () {
                    if (chart.series && chart.labelSeries) { // #7931, chart destroyed
                        chart.drawSeriesLabels();
                    }
                }, chart.renderer.forExport || !delay ? 0 : delay);
            }
        }
        // Leave both events, we handle animation differently (#9815)
        addEvent(Chart, 'load', drawLabels);
        addEvent(Chart, 'redraw', drawLabels);

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


    });
}));