src/main/webapp/Highcharts-5.0.12/code/js/modules/overlapping-datalabels.src.js

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/**
 * @license Highcharts JS v5.0.12 (2017-05-24)
 *
 * (c) 2009-2017 Torstein Honsi
 *
 * License: www.highcharts.com/license
 */
'use strict';
(function(factory) {
    if (typeof module === 'object' && module.exports) {
        module.exports = factory;
    } else {
        factory(Highcharts);
    }
}(function(Highcharts) {
    (function(H) {
        /**
         * (c) 2009-2017 Torstein Honsi
         *
         * License: www.highcharts.com/license
         */
        /**
         * Highcharts module to hide overlapping data labels. This module is included in
         * Highcharts.
         */
        var Chart = H.Chart,
            each = H.each,
            pick = H.pick,
            addEvent = H.addEvent;

        // Collect potensial overlapping data labels. Stack labels probably don't need
        // to be considered because they are usually accompanied by data labels that lie
        // inside the columns.
        Chart.prototype.callbacks.push(function(chart) {
            function collectAndHide() {
                var labels = [];

                each(chart.series || [], function(series) {
                    var dlOptions = series.options.dataLabels,
                        // Range series have two collections
                        collections = series.dataLabelCollections || ['dataLabel'];

                    if (
                        (dlOptions.enabled || series._hasPointLabels) &&
                        !dlOptions.allowOverlap &&
                        series.visible
                    ) { // #3866
                        each(collections, function(coll) {
                            each(series.points, function(point) {
                                if (point[coll]) {
                                    point[coll].labelrank = pick(
                                        point.labelrank,
                                        point.shapeArgs && point.shapeArgs.height
                                    ); // #4118
                                    labels.push(point[coll]);
                                }
                            });
                        });
                    }
                });