WebContent/highcharts4/js/modules/drilldown.src.js

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/**
 * Highcharts Drilldown plugin
 * 
 * Author: Torstein Honsi
 * License: MIT License
 *
 * Demo: http://jsfiddle.net/highcharts/Vf3yT/
 */

/*global Highcharts,HighchartsAdapter*/
(function (H) {

	"use strict";

	var noop = function () {},
		defaultOptions = H.getOptions(),
		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 = HighchartsAdapter.fireEvent,
		inArray = HighchartsAdapter.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.raw || 'none';

		// Interpolate
		} else {
			from = from.rgba;
			to = to.rgba;
			hasAlpha = (to[3] !== 1 || from[3] !== 1);
			ret = (hasAlpha ? 'rgba(' : 'rgb(') + 
				Math.round(to[0] + (from[0] - to[0]) * (1 - pos)) + ',' + 
				Math.round(to[1] + (from[1] - to[1]) * (1 - pos)) + ',' + 
				Math.round(to[2] + (from[2] - to[2]) * (1 - pos)) + 
				(hasAlpha ? (',' + (to[3] + (from[3] - to[3]) * (1 - pos))) : '') + ')';
		}
		return ret;
	}
	/**