include/lib/jqplot/plugins/jqplot.donutRenderer.js

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/**
 * jqPlot
 * Pure JavaScript plotting plugin using jQuery
 *
 * Version: 1.0.3
 * Revision: 1117
 *
 * Copyright (c) 2009-2012 Chris Leonello
 * jqPlot is currently available for use in all personal or commercial projects 
 * under both the MIT (http://www.opensource.org/licenses/mit-license.php) and GPL 
 * version 2.0 (http://www.gnu.org/licenses/gpl-2.0.html) licenses. This means that you can 
 * choose the license that best suits your project and use it accordingly. 
 *
 * Although not required, the author would appreciate an email letting him 
 * know of any substantial use of jqPlot.  You can reach the author at: 
 * chris at jqplot dot com or see http://www.jqplot.com/info.php .
 *
 * If you are feeling kind and generous, consider supporting the project by
 * making a donation at: http://www.jqplot.com/donate.php .
 *
 * sprintf functions contained in jqplot.sprintf.js by Ash Searle:
 *
 *     version 2007.04.27
 *     author Ash Searle
 *     http://hexmen.com/blog/2007/03/printf-sprintf/
 *     http://hexmen.com/js/sprintf.js
 *     The author (Ash Searle) has placed this code in the public domain:
 *     "This code is unrestricted: you are free to use it however you like."
 * 
 */
(function($) {
    /**
     * Class: $.jqplot.DonutRenderer
     * Plugin renderer to draw a donut chart.
     * x values, if present, will be used as slice labels.
     * y values give slice size.
     * 
     * To use this renderer, you need to include the 
     * donut renderer plugin, for example:
     * 
     * > <script type="text/javascript" src="plugins/jqplot.donutRenderer.js"></script>
     * 
     * Properties described here are passed into the $.jqplot function
     * as options on the series renderer.  For example:
     * 
     * > plot2 = $.jqplot('chart2', [s1, s2], {
     * >     seriesDefaults: {
     * >         renderer:$.jqplot.DonutRenderer,
     * >         rendererOptions:{
     * >              sliceMargin: 2,
     * >              innerDiameter: 110,
     * >              startAngle: -90
     * >          }
     * >      }
     * > });
     * 
     * A donut plot will trigger events on the plot target
     * according to user interaction.  All events return the event object,
     * the series index, the point (slice) index, and the point data for 
     * the appropriate slice.