include/lib/jqplot/plugins/jqplot.BezierCurveRenderer.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.BezierCurveRenderer.js
    // Renderer which draws lines as stacked bezier curves.
    // Data for the line will not be specified as an array of
    // [x, y] data point values, but as a an array of [start piont, bezier curve]
    // So, the line is specified as: [[xstart, ystart], [cp1x, cp1y, cp2x, cp2y, xend, yend]].
    $.jqplot.BezierCurveRenderer = function(){
        $.jqplot.LineRenderer.call(this);
    };
    
    $.jqplot.BezierCurveRenderer.prototype = new $.jqplot.LineRenderer();
    $.jqplot.BezierCurveRenderer.prototype.constructor = $.jqplot.BezierCurveRenderer;

    
    // Method: setGridData
    // converts the user data values to grid coordinates and stores them
    // in the gridData array.
    // Called with scope of a series.
    $.jqplot.BezierCurveRenderer.prototype.setGridData = function(plot) {
        // recalculate the grid data
        var xp = this._xaxis.series_u2p;
        var yp = this._yaxis.series_u2p;
        // this._plotData should be same as this.data
        var data = this.data;
        this.gridData = [];
        this._prevGridData = [];
        // if seriesIndex = 0, fill to x axis.
        // if seriesIndex > 0, fill to previous series data.
        var idx = this.index;
        if (data.length == 2) {