ABPCMS.Web/lib/chart.js/src/core/core.layoutService.js

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'use strict';

module.exports = function(Chart) {

	var helpers = Chart.helpers;

	function filterByPosition(array, position) {
		return helpers.where(array, function(v) {
			return v.position === position;
		});
	}

	function sortByWeight(array, reverse) {
		array.forEach(function(v, i) {
			v._tmpIndex_ = i;
			return v;
		});
		array.sort(function(a, b) {
			var v0 = reverse ? b : a;
			var v1 = reverse ? a : b;
			return v0.weight === v1.weight ?
				v0._tmpIndex_ - v1._tmpIndex_ :
				v0.weight - v1.weight;
		});
		array.forEach(function(v) {
			delete v._tmpIndex_;
		});
	}

	/**
	 * @interface ILayoutItem
	 * @prop {String} position - The position of the item in the chart layout. Possible values are
	 * 'left', 'top', 'right', 'bottom', and 'chartArea'
	 * @prop {Number} weight - The weight used to sort the item. Higher weights are further away from the chart area
	 * @prop {Boolean} fullWidth - if true, and the item is horizontal, then push vertical boxes down
	 * @prop {Function} isHorizontal - returns true if the layout item is horizontal (ie. top or bottom)
	 * @prop {Function} update - Takes two parameters: width and height. Returns size of item
	 * @prop {Function} getPadding -  Returns an object with padding on the edges
	 * @prop {Number} width - Width of item. Must be valid after update()
	 * @prop {Number} height - Height of item. Must be valid after update()
	 * @prop {Number} left - Left edge of the item. Set by layout system and cannot be used in update
	 * @prop {Number} top - Top edge of the item. Set by layout system and cannot be used in update
	 * @prop {Number} right - Right edge of the item. Set by layout system and cannot be used in update
	 * @prop {Number} bottom - Bottom edge of the item. Set by layout system and cannot be used in update
	 */

	// The layout service is very self explanatory.  It's responsible for the layout within a chart.
	// Scales, Legends and Plugins all rely on the layout service and can easily register to be placed anywhere they need
	// It is this service's responsibility of carrying out that layout.
	Chart.layoutService = {
		defaults: {},

		/**
		 * Register a box to a chart.
		 * A box is simply a reference to an object that requires layout. eg. Scales, Legend, Title.
		 * @param {Chart} chart - the chart to use
		 * @param {ILayoutItem} item - the item to add to be layed out
		 */
		addBox: function(chart, item) {
			if (!chart.boxes) {