ZSJ_BCY_Web/lib/hcharts/Highcharts/5.0.6/js/modules/drilldown.src.js

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/**
 * @license Highcharts JS v5.0.6 (2016-12-07)
 * Highcharts Drilldown module
 * 
 * Author: 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) {
        /**
         * Highcharts Drilldown module
         * 
         * Author: Torstein Honsi
         * License: www.highcharts.com/license
         *
         */

        'use strict';

        var noop = H.noop,
            color = H.color,
            defaultOptions = H.defaultOptions,
            each = H.each,
            extend = H.extend,
            format = H.format,
            pick = H.pick,
            wrap = H.wrap,
            Chart = H.Chart,
            seriesTypes = H.seriesTypes,
            PieSeries = seriesTypes.pie,
            ColumnSeries = seriesTypes.column,
            Tick = H.Tick,
            fireEvent = H.fireEvent,
            inArray = H.inArray,
            ddSeriesId = 1;

        // Utilities
        /*
         * Return an intermediate color between two colors, according to pos where 0
         * is the from color and 1 is the to color. This method is copied from ColorAxis.js
         * and should always be kept updated, until we get AMD support.
         */
        function tweenColors(from, to, pos) {
            // Check for has alpha, because rgba colors perform worse due to lack of
            // support in WebKit.
            var hasAlpha,
                ret;

            // Unsupported color, return to-color (#3920)
            if (!to.rgba.length || !from.rgba.length) {
                ret = to.input || 'none';

                // Interpolate