src/main/webapp/static/lib/hcharts/Highcharts/5.0.6/js/modules/overlapping-datalabels.src.js

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/**
 * @license Highcharts JS v5.0.6 (2016-12-07)
 *
 * (c) 2009-2016 Torstein Honsi
 *
 * License: www.highcharts.com/license
 */
(function(factory) {
    if (typeof module === 'object' && module.exports) {
        module.exports = factory;
    } else {
        factory(Highcharts);
    }
}(function(Highcharts) {
    (function(H) {
        /**
         * (c) 2009-2016 Torstein Honsi
         *
         * License: www.highcharts.com/license
         */
        'use strict';
        /**
         * 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,
                        collections = series.dataLabelCollections || ['dataLabel']; // Range series have two collections
                    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]);
                                }
                            });
                        });
                    }
                });
                chart.hideOverlappingLabels(labels);
            }

            // Do it now ...
            collectAndHide();

            // ... and after each chart redraw
            addEvent(chart, 'redraw', collectAndHide);

        });