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

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/**
 * @license Highcharts JS v5.0.6 (2016-12-07)
 * Boost module
 *
 * (c) 2010-2016 Highsoft AS
 * 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) {
        /**
         * License: www.highcharts.com/license
         * Author: Torstein Honsi
         * 
         * This is an experimental Highcharts module that draws long data series on a canvas
         * in order to increase performance of the initial load time and tooltip responsiveness.
         *
         * Compatible with HTML5 canvas compatible browsers (not IE < 9).
         *
         *
         * 
         * Development plan
         * - Column range.
         * - Heatmap. Modify the heatmap-canvas demo so that it uses this module.
         * - Treemap.
         * - Check how it works with Highstock and data grouping. Currently it only works when navigator.adaptToUpdatedData
         *   is false. It is also recommended to set scrollbar.liveRedraw to false.
         * - Check inverted charts.
         * - Check reversed axes.
         * - Chart callback should be async after last series is drawn. (But not necessarily, we don't do
        	 that with initial series animation).
         * - Cache full-size image so we don't have to redraw on hide/show and zoom up. But k-d-tree still
         *   needs to be built.
         * - Test IE9 and IE10.
         * - Stacking is not perhaps not correct since it doesn't use the translation given in 
         *   the translate method. If this gets to complicated, a possible way out would be to 
         *   have a simplified renderCanvas method that simply draws the areaPath on a canvas.
         *
         * If this module is taken in as part of the core
         * - All the loading logic should be merged with core. Update styles in the core.
         * - Most of the method wraps should probably be added directly in parent methods.
         *
         * Notes for boost mode
         * - Area lines are not drawn
         * - Point markers are not drawn on line-type series
         * - Lines are not drawn on scatter charts
         * - Zones and negativeColor don't work
         * - Initial point colors aren't rendered
         * - Columns are always one pixel wide. Don't set the threshold too low.
         *
         * Optimizing tips for users
         * - For scatter plots, use a marker.radius of 1 or less. It results in a rectangle being drawn, which is 
         *   considerably faster than a circle.