include/lib/jqplot/plugins/jqplot.dateAxisRenderer.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: $.jqplot.DateAxisRenderer
     * A plugin for a jqPlot to render an axis as a series of date values.
     * This renderer has no options beyond those supplied by the <Axis> class.
     * It supplies it's own tick formatter, so the tickOptions.formatter option
     * should not be overridden.
     * 
     * Thanks to Ken Synder for his enhanced Date instance methods which are
     * included with this code <http://kendsnyder.com/sandbox/date/>.
     * 
     * To use this renderer, include the plugin in your source
     * > <script type="text/javascript" language="javascript" src="plugins/jqplot.dateAxisRenderer.js"></script>
     * 
     * and supply the appropriate options to your plot
     * 
     * > {axes:{xaxis:{renderer:$.jqplot.DateAxisRenderer}}}
     * 
     * Dates can be passed into the axis in almost any recognizable value and 
     * will be parsed.  They will be rendered on the axis in the format
     * specified by tickOptions.formatString.  e.g. tickOptions.formatString = '%Y-%m-%d'.
     * 
     * Accecptable format codes 
     * are:
     * 
     * > Code    Result                  Description
     * >             == Years ==
     * > %Y      2008                Four-digit year
     * > %y      08                  Two-digit year
     * >             == Months ==