text: /**
   * 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.CanvasAxisTickRenderer
      * Renderer to draw axis ticks with a canvas element to support advanced
      * featrues such as rotated text.  This renderer uses a separate rendering engine
      * to draw the text on the canvas.  Two modes of rendering the text are available.
      * If the browser has native font support for canvas fonts (currently Mozila 3.5
      * and Safari 4), you can enable text rendering with the canvas fillText method.
      * You do so by setting the "enableFontSupport" option to true. 
      * 
      * Browsers lacking native font support will have the text drawn on the canvas
      * using the Hershey font metrics.  Even if the "enableFontSupport" option is true
      * non-supporting browsers will still render with the Hershey font.
      */
      $.jqplot.CanvasAxisTickRenderer = function(options) {
          // Group: Properties
          
          // prop: mark
          // tick mark on the axis.  One of 'inside', 'outside', 'cross', '' or null.
          this.mark = 'outside';
          // prop: showMark
          // wether or not to show the mark on the axis.
          this.showMark = true;
          // prop: showGridline
          // wether or not to draw the gridline on the grid at this tick.
          this.showGridline = true;
          // prop: isMinorTick
          // if this is a minor tick.
          this.isMinorTick = false;
          // prop: angle
          // angle of text, measured clockwise from x axis.
          this.angle = 0;
          // prop:  markSize
          // Length of the tick marks in pixels.  For 'cross' style, length
          // will be stoked above and below axis, so total length will be twice this.
          this.markSize = 4;
          // prop: show
          // wether or not to show the tick (mark and label).
          this.show = true;
          // prop: showLabel
          // wether or not to show the label.
          this.showLabel = true;
          // prop: labelPosition
          // 'auto', 'start', 'middle' or 'end'.
          // Whether tick label should be positioned so the start, middle, or end
          // of the tick mark.
          this.labelPosition = 'auto';
          this.label = '';
          this.value = null;
          this._styles = {};
          // prop: formatter
          // A class of a formatter for the tick text.
          // The default $.jqplot.DefaultTickFormatter uses sprintf.
          this.formatter = $.jqplot.DefaultTickFormatter;
          // prop: formatString
          // string passed to the formatter.
          this.formatString = '';
          // prop: prefix
          // String to prepend to the tick label.
          // Prefix is prepended to the formatted tick label.
          this.prefix = '';
          // prop: fontFamily
          // css spec for the font-family css attribute.
          this.fontFamily = '"Trebuchet MS", Arial, Helvetica, sans-serif';
          // prop: fontSize
          // CSS spec for font size.
          this.fontSize = '10pt';
          // prop: fontWeight
          // CSS spec for fontWeight
          this.fontWeight = 'normal';
          // prop: fontStretch
          // Multiplier to condense or expand font width.  
          // Applies only to browsers which don't support canvas native font rendering.
          this.fontStretch = 1.0;
          // prop: textColor
          // css spec for the color attribute.
          this.textColor = '#666666';
          // prop: enableFontSupport
          // true to turn on native canvas font support in Mozilla 3.5+ and Safari 4+.
          // If true, tick label will be drawn with canvas tag native support for fonts.
          // If false, tick label will be drawn with Hershey font metrics.
          this.enableFontSupport = true;
          // prop: pt2px
          // Point to pixel scaling factor, used for computing height of bounding box
          // around a label.  The labels text renderer has a default setting of 1.4, which 
          // should be suitable for most fonts.  Leave as null to use default.  If tops of
          // letters appear clipped, increase this.  If bounding box seems too big, decrease.
          // This is an issue only with the native font renderering capabilities of Mozilla
          // 3.5 and Safari 4 since they do not provide a method to determine the font height.
          this.pt2px = null;
          
          this._elem;
          this._ctx;
          this._plotWidth;
          this._plotHeight;
          this._plotDimensions = {height:null, width:null};
          
          $.extend(true, this, options);
          
          var ropts = {fontSize:this.fontSize, fontWeight:this.fontWeight, fontStretch:this.fontStretch, fillStyle:this.textColor, angle:this.getAngleRad(), fontFamily:this.fontFamily};
          if (this.pt2px) {
              ropts.pt2px = this.pt2px;
          }
          
          if (this.enableFontSupport) {
              if ($.jqplot.support_canvas_text()) {
                  this._textRenderer = new $.jqplot.CanvasFontRenderer(ropts);
              }
              
              else {
                  this._textRenderer = new $.jqplot.CanvasTextRenderer(ropts); 
              }
          }
          else {
              this._textRenderer = new $.jqplot.CanvasTextRenderer(ropts); 
          }
      };
      
      $.jqplot.CanvasAxisTickRenderer.prototype.init = function(options) {
          $.extend(true, this, options);
          this._textRenderer.init({fontSize:this.fontSize, fontWeight:this.fontWeight, fontStretch:this.fontStretch, fillStyle:this.textColor, angle:this.getAngleRad(), fontFamily:this.fontFamily});
      };
      
      // return width along the x axis
      // will check first to see if an element exists.
      // if not, will return the computed text box width.
      $.jqplot.CanvasAxisTickRenderer.prototype.getWidth = function(ctx) {
          if (this._elem) {
           return this._elem.outerWidth(true);
          }
          else {
              var tr = this._textRenderer;
              var l = tr.getWidth(ctx);
              var h = tr.getHeight(ctx);
              var w = Math.abs(Math.sin(tr.angle)*h) + Math.abs(Math.cos(tr.angle)*l);
              return w;
          }
      };
      
      // return height along the y axis.
      $.jqplot.CanvasAxisTickRenderer.prototype.getHeight = function(ctx) {
          if (this._elem) {
           return this._elem.outerHeight(true);
          }
          else {
              var tr = this._textRenderer;
              var l = tr.getWidth(ctx);
              var h = tr.getHeight(ctx);
              var w = Math.abs(Math.cos(tr.angle)*h) + Math.abs(Math.sin(tr.angle)*l);
              return w;
          }
      };
      
      $.jqplot.CanvasAxisTickRenderer.prototype.getAngleRad = function() {
          var a = this.angle * Math.PI/180;
          return a;
      };
      
      
      $.jqplot.CanvasAxisTickRenderer.prototype.setTick = function(value, axisName, isMinor) {
          this.value = value;
          if (isMinor) {
              this.isMinorTick = true;
          }
          return this;
      };
      
      $.jqplot.CanvasAxisTickRenderer.prototype.draw = function(ctx, plot) {
          if (!this.label) {
              this.label = this.prefix + this.formatter(this.formatString, this.value);
          }
          
          // Memory Leaks patch
          if (this._elem) {
              if ($.jqplot.use_excanvas && window.G_vmlCanvasManager.uninitElement !== undefined) {
                  window.G_vmlCanvasManager.uninitElement(this._elem.get(0));
              }
              
              this._elem.emptyForce();
              this._elem = null;
          }
  
          // create a canvas here, but can't draw on it untill it is appended
          // to dom for IE compatability.
  
          var elem = plot.canvasManager.getCanvas();
  
          this._textRenderer.setText(this.label, ctx);
          var w = this.getWidth(ctx);
          var h = this.getHeight(ctx);
          // canvases seem to need to have width and heigh attributes directly set.
          elem.width = w;
          elem.height = h;
          elem.style.width = w;
          elem.style.height = h;
          elem.style.textAlign = 'left';
          elem.style.position = 'absolute';
  		
  		elem = plot.canvasManager.initCanvas(elem);
  		
          this._elem = $(elem);
          this._elem.css(this._styles);
          this._elem.addClass('jqplot-'+this.axis+'-tick');
  		
          elem = null;
          return this._elem;
      };
      
      $.jqplot.CanvasAxisTickRenderer.prototype.pack = function() {
          this._textRenderer.draw(this._elem.get(0).getContext("2d"), this.label);
      };
      
  })(jQuery);