text: // Copyright 2006 Google Inc.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //   http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  
  // Known Issues:
  //
  // * Patterns are not implemented.
  // * Radial gradient are not implemented. The VML version of these look very
  //   different from the canvas one.
  // * Clipping paths are not implemented.
  // * Coordsize. The width and height attribute have higher priority than the
  //   width and height style values which isn't correct.
  // * Painting mode isn't implemented.
  // * Canvas width/height should is using content-box by default. IE in
  //   Quirks mode will draw the canvas using border-box. Either change your
  //   doctype to HTML5
  //   (http://www.whatwg.org/specs/web-apps/current-work/#the-doctype)
  //   or use Box Sizing Behavior from WebFX
  //   (http://webfx.eae.net/dhtml/boxsizing/boxsizing.html)
  // * Non uniform scaling does not correctly scale strokes.
  // * Optimize. There is always room for speed improvements.
  
  // Only add this code if we do not already have a canvas implementation
  if (!document.createElement('canvas').getContext) {
  
  (function() {
  
    // alias some functions to make (compiled) code shorter
    var m = Math;
    var mr = m.round;
    var ms = m.sin;
    var mc = m.cos;
    var abs = m.abs;
    var sqrt = m.sqrt;
  
    // this is used for sub pixel precision
    var Z = 10;
    var Z2 = Z / 2;
  
    /**
     * This funtion is assigned to the <canvas> elements as element.getContext().
     * @this {HTMLElement}
     * @return {CanvasRenderingContext2D_}
     */
    function getContext() {
      return this.context_ ||
          (this.context_ = new CanvasRenderingContext2D_(this));
    }
  
    var slice = Array.prototype.slice;
  
    /**
     * Binds a function to an object. The returned function will always use the
     * passed in {@code obj} as {@code this}.
     *
     * Example:
     *
     *   g = bind(f, obj, a, b)
     *   g(c, d) // will do f.call(obj, a, b, c, d)
     *
     * @param {Function} f The function to bind the object to
     * @param {Object} obj The object that should act as this when the function
     *     is called
     * @param {*} var_args Rest arguments that will be used as the initial
     *     arguments when the function is called
     * @return {Function} A new function that has bound this
     */
    function bind(f, obj, var_args) {
      var a = slice.call(arguments, 2);
      return function() {
        return f.apply(obj, a.concat(slice.call(arguments)));
      };
    }
  
    var G_vmlCanvasManager_ = {
      init: function(opt_doc) {
        if (/MSIE/.test(navigator.userAgent) && !window.opera) {
          var doc = opt_doc || document;
          // Create a dummy element so that IE will allow canvas elements to be
          // recognized.
          doc.createElement('canvas');
          doc.attachEvent('onreadystatechange', bind(this.init_, this, doc));
        }
      },
  
      init_: function(doc) {
        // create xmlns
        if (!doc.namespaces['g_vml_']) {
          doc.namespaces.add('g_vml_', 'urn:schemas-microsoft-com:vml',
                             '#default#VML');
  
        }
        if (!doc.namespaces['g_o_']) {
          doc.namespaces.add('g_o_', 'urn:schemas-microsoft-com:office:office',
                             '#default#VML');
        }
  
        // Setup default CSS.  Only add one style sheet per document
        if (!doc.styleSheets['ex_canvas_']) {
          var ss = doc.createStyleSheet();
          ss.owningElement.id = 'ex_canvas_';
          ss.cssText = 'canvas{display:inline-block;overflow:hidden;' +
              // default size is 300x150 in Gecko and Opera
              'text-align:left;width:300px;height:150px}' +
              'g_vml_\\:*{behavior:url(#default#VML)}' +
              'g_o_\\:*{behavior:url(#default#VML)}';
  
        }
  
        // find all canvas elements
        var els = doc.getElementsByTagName('canvas');
        for (var i = 0; i < els.length; i++) {
          this.initElement(els[i]);
        }
      },
  
      /**
       * Public initializes a canvas element so that it can be used as canvas
       * element from now on. This is called automatically before the page is
       * loaded but if you are creating elements using createElement you need to
       * make sure this is called on the element.
       * @param {HTMLElement} el The canvas element to initialize.
       * @return {HTMLElement} the element that was created.
       */
      initElement: function(el) {
        if (!el.getContext) {
  
          el.getContext = getContext;
  
          // Remove fallback content. There is no way to hide text nodes so we
          // just remove all childNodes. We could hide all elements and remove
          // text nodes but who really cares about the fallback content.
          el.innerHTML = '';
  
          // do not use inline function because that will leak memory
          el.attachEvent('onpropertychange', onPropertyChange);
          el.attachEvent('onresize', onResize);
  
          var attrs = el.attributes;
          if (attrs.width && attrs.width.specified) {
            // TODO: use runtimeStyle and coordsize
            // el.getContext().setWidth_(attrs.width.nodeValue);
            el.style.width = attrs.width.nodeValue + 'px';
          } else {
            el.width = el.clientWidth;
          }
          if (attrs.height && attrs.height.specified) {
            // TODO: use runtimeStyle and coordsize
            // el.getContext().setHeight_(attrs.height.nodeValue);
            el.style.height = attrs.height.nodeValue + 'px';
          } else {
            el.height = el.clientHeight;
          }
          //el.getContext().setCoordsize_()
        }
        return el;
      }
    };
  
    function onPropertyChange(e) {
      var el = e.srcElement;
  
      switch (e.propertyName) {
        case 'width':
          el.style.width = el.attributes.width.nodeValue + 'px';
          el.getContext().clearRect();
          break;
        case 'height':
          el.style.height = el.attributes.height.nodeValue + 'px';
          el.getContext().clearRect();
          break;
      }
    }
  
    function onResize(e) {
      var el = e.srcElement;
      if (el.firstChild) {
        el.firstChild.style.width =  el.clientWidth + 'px';
        el.firstChild.style.height = el.clientHeight + 'px';
      }
    }
  
    G_vmlCanvasManager_.init();
  
    // precompute "00" to "FF"
    var dec2hex = [];
    for (var i = 0; i < 16; i++) {
      for (var j = 0; j < 16; j++) {
        dec2hex[i * 16 + j] = i.toString(16) + j.toString(16);
      }
    }
  
    function createMatrixIdentity() {
      return [
        [1, 0, 0],
        [0, 1, 0],
        [0, 0, 1]
      ];
    }
  
    function matrixMultiply(m1, m2) {
      var result = createMatrixIdentity();
  
      for (var x = 0; x < 3; x++) {
        for (var y = 0; y < 3; y++) {
          var sum = 0;
  
          for (var z = 0; z < 3; z++) {
            sum += m1[x][z] * m2[z][y];
          }
  
          result[x][y] = sum;
        }
      }
      return result;
    }
  
    function copyState(o1, o2) {
      o2.fillStyle     = o1.fillStyle;
      o2.lineCap       = o1.lineCap;
      o2.lineJoin      = o1.lineJoin;
      o2.lineWidth     = o1.lineWidth;
      o2.miterLimit    = o1.miterLimit;
      o2.shadowBlur    = o1.shadowBlur;
      o2.shadowColor   = o1.shadowColor;
      o2.shadowOffsetX = o1.shadowOffsetX;
      o2.shadowOffsetY = o1.shadowOffsetY;
      o2.strokeStyle   = o1.strokeStyle;
      o2.globalAlpha   = o1.globalAlpha;
      o2.arcScaleX_    = o1.arcScaleX_;
      o2.arcScaleY_    = o1.arcScaleY_;
      o2.lineScale_    = o1.lineScale_;
    }
  
    function processStyle(styleString) {
      var str, alpha = 1;
  
      styleString = String(styleString);
      if (styleString.substring(0, 3) == 'rgb') {
        var start = styleString.indexOf('(', 3);
        var end = styleString.indexOf(')', start + 1);
        var guts = styleString.substring(start + 1, end).split(',');
  
        str = '#';
        for (var i = 0; i < 3; i++) {
          str += dec2hex[Number(guts[i])];
        }
  
        if (guts.length == 4 && styleString.substr(3, 1) == 'a') {
          alpha = guts[3];
        }
      } else {
        str = styleString;
      }
  
      return {color: str, alpha: alpha};
    }
  
    function processLineCap(lineCap) {
      switch (lineCap) {
        case 'butt':
          return 'flat';
        case 'round':
          return 'round';
        case 'square':
        default:
          return 'square';
      }
    }
  
    /**
     * This class implements CanvasRenderingContext2D interface as described by
     * the WHATWG.
     * @param {HTMLElement} surfaceElement The element that the 2D context should
     * be associated with
     */
    function CanvasRenderingContext2D_(surfaceElement) {
      this.m_ = createMatrixIdentity();
  
      this.mStack_ = [];
      this.aStack_ = [];
      this.currentPath_ = [];
  
      // Canvas context properties
      this.strokeStyle = '#000';
      this.fillStyle = '#000';
  
      this.lineWidth = 1;
      this.lineJoin = 'miter';
      this.lineCap = 'butt';
      this.miterLimit = Z * 1;
      this.globalAlpha = 1;
      this.canvas = surfaceElement;
  
      var el = surfaceElement.ownerDocument.createElement('div');
      el.style.width =  surfaceElement.clientWidth + 'px';
      el.style.height = surfaceElement.clientHeight + 'px';
      el.style.overflow = 'hidden';
      el.style.position = 'absolute';
      surfaceElement.appendChild(el);
  
      this.element_ = el;
      this.arcScaleX_ = 1;
      this.arcScaleY_ = 1;
      this.lineScale_ = 1;
    }
  
    var contextPrototype = CanvasRenderingContext2D_.prototype;
    contextPrototype.clearRect = function() {
      this.element_.innerHTML = '';
    };
  
    contextPrototype.beginPath = function() {
      // TODO: Branch current matrix so that save/restore has no effect
      //       as per safari docs.
      this.currentPath_ = [];
    };
  
    contextPrototype.moveTo = function(aX, aY) {
      var p = this.getCoords_(aX, aY);
      this.currentPath_.push({type: 'moveTo', x: p.x, y: p.y});
      this.currentX_ = p.x;
      this.currentY_ = p.y;
    };
  
    contextPrototype.lineTo = function(aX, aY) {
      var p = this.getCoords_(aX, aY);
      this.currentPath_.push({type: 'lineTo', x: p.x, y: p.y});
  
      this.currentX_ = p.x;
      this.currentY_ = p.y;
    };
  
    contextPrototype.bezierCurveTo = function(aCP1x, aCP1y,
                                              aCP2x, aCP2y,
                                              aX, aY) {
      var p = this.getCoords_(aX, aY);
      var cp1 = this.getCoords_(aCP1x, aCP1y);
      var cp2 = this.getCoords_(aCP2x, aCP2y);
      bezierCurveTo(this, cp1, cp2, p);
    };
  
    // Helper function that takes the already fixed cordinates.
    function bezierCurveTo(self, cp1, cp2, p) {
      self.currentPath_.push({
        type: 'bezierCurveTo',
        cp1x: cp1.x,
        cp1y: cp1.y,
        cp2x: cp2.x,
        cp2y: cp2.y,
        x: p.x,
        y: p.y
      });
      self.currentX_ = p.x;
      self.currentY_ = p.y;
    }
  
    contextPrototype.quadraticCurveTo = function(aCPx, aCPy, aX, aY) {
      // the following is lifted almost directly from
      // http://developer.mozilla.org/en/docs/Canvas_tutorial:Drawing_shapes
  
      var cp = this.getCoords_(aCPx, aCPy);
      var p = this.getCoords_(aX, aY);
  
      var cp1 = {
        x: this.currentX_ + 2.0 / 3.0 * (cp.x - this.currentX_),
        y: this.currentY_ + 2.0 / 3.0 * (cp.y - this.currentY_)
      };
      var cp2 = {
        x: cp1.x + (p.x - this.currentX_) / 3.0,
        y: cp1.y + (p.y - this.currentY_) / 3.0
      };
  
      bezierCurveTo(this, cp1, cp2, p);
    };
  
    contextPrototype.arc = function(aX, aY, aRadius,
                                    aStartAngle, aEndAngle, aClockwise) {
      aRadius *= Z;
      var arcType = aClockwise ? 'at' : 'wa';
  
      var xStart = aX + mc(aStartAngle) * aRadius - Z2;
      var yStart = aY + ms(aStartAngle) * aRadius - Z2;
  
      var xEnd = aX + mc(aEndAngle) * aRadius - Z2;
      var yEnd = aY + ms(aEndAngle) * aRadius - Z2;
  
      // IE won't render arches drawn counter clockwise if xStart == xEnd.
      if (xStart == xEnd && !aClockwise) {
        xStart += 0.125; // Offset xStart by 1/80 of a pixel. Use something
                         // that can be represented in binary
      }
  
      var p = this.getCoords_(aX, aY);
      var pStart = this.getCoords_(xStart, yStart);
      var pEnd = this.getCoords_(xEnd, yEnd);
  
      this.currentPath_.push({type: arcType,
                             x: p.x,
                             y: p.y,
                             radius: aRadius,
                             xStart: pStart.x,
                             yStart: pStart.y,
                             xEnd: pEnd.x,
                             yEnd: pEnd.y});
  
    };
  
    contextPrototype.rect = function(aX, aY, aWidth, aHeight) {
      this.moveTo(aX, aY);
      this.lineTo(aX + aWidth, aY);
      this.lineTo(aX + aWidth, aY + aHeight);
      this.lineTo(aX, aY + aHeight);
      this.closePath();
    };
  
    contextPrototype.strokeRect = function(aX, aY, aWidth, aHeight) {
      var oldPath = this.currentPath_;
      this.beginPath();
  
      this.moveTo(aX, aY);
      this.lineTo(aX + aWidth, aY);
      this.lineTo(aX + aWidth, aY + aHeight);
      this.lineTo(aX, aY + aHeight);
      this.closePath();
      this.stroke();
  
      this.currentPath_ = oldPath;
    };
  
    contextPrototype.fillRect = function(aX, aY, aWidth, aHeight) {
      var oldPath = this.currentPath_;
      this.beginPath();
  
      this.moveTo(aX, aY);
      this.lineTo(aX + aWidth, aY);
      this.lineTo(aX + aWidth, aY + aHeight);
      this.lineTo(aX, aY + aHeight);
      this.closePath();
      this.fill();
  
      this.currentPath_ = oldPath;
    };
  
    contextPrototype.createLinearGradient = function(aX0, aY0, aX1, aY1) {
      var gradient = new CanvasGradient_('gradient');
      gradient.x0_ = aX0;
      gradient.y0_ = aY0;
      gradient.x1_ = aX1;
      gradient.y1_ = aY1;
      return gradient;
    };
  
    contextPrototype.createRadialGradient = function(aX0, aY0, aR0,
                                                     aX1, aY1, aR1) {
      var gradient = new CanvasGradient_('gradientradial');
      gradient.x0_ = aX0;
      gradient.y0_ = aY0;
      gradient.r0_ = aR0;
      gradient.x1_ = aX1;
      gradient.y1_ = aY1;
      gradient.r1_ = aR1;
      return gradient;
    };
  
    contextPrototype.drawImage = function(image, var_args) {
      var dx, dy, dw, dh, sx, sy, sw, sh;
  
      // to find the original width we overide the width and height
      var oldRuntimeWidth = image.runtimeStyle.width;
      var oldRuntimeHeight = image.runtimeStyle.height;
      image.runtimeStyle.width = 'auto';
      image.runtimeStyle.height = 'auto';
  
      // get the original size
      var w = image.width;
      var h = image.height;
  
      // and remove overides
      image.runtimeStyle.width = oldRuntimeWidth;
      image.runtimeStyle.height = oldRuntimeHeight;
  
      if (arguments.length == 3) {
        dx = arguments[1];
        dy = arguments[2];
        sx = sy = 0;
        sw = dw = w;
        sh = dh = h;
      } else if (arguments.length == 5) {
        dx = arguments[1];
        dy = arguments[2];
        dw = arguments[3];
        dh = arguments[4];
        sx = sy = 0;
        sw = w;
        sh = h;
      } else if (arguments.length == 9) {
        sx = arguments[1];
        sy = arguments[2];
        sw = arguments[3];
        sh = arguments[4];
        dx = arguments[5];
        dy = arguments[6];
        dw = arguments[7];
        dh = arguments[8];
      } else {
        throw Error('Invalid number of arguments');
      }
  
      var d = this.getCoords_(dx, dy);
  
      var w2 = sw / 2;
      var h2 = sh / 2;
  
      var vmlStr = [];
  
      var W = 10;
      var H = 10;
  
      // For some reason that I've now forgotten, using divs didn't work
      vmlStr.push(' <g_vml_:group',
                  ' coordsize="', Z * W, ',', Z * H, '"',
                  ' coordorigin="0,0"' ,
                  ' style="width:', W, 'px;height:', H, 'px;position:absolute;');
  
      // If filters are necessary (rotation exists), create them
      // filters are bog-slow, so only create them if abbsolutely necessary
      // The following check doesn't account for skews (which don't exist
      // in the canvas spec (yet) anyway.
  
      if (this.m_[0][0] != 1 || this.m_[0][1]) {
        var filter = [];
  
        // Note the 12/21 reversal
        filter.push('M11=', this.m_[0][0], ',',
                    'M12=', this.m_[1][0], ',',
                    'M21=', this.m_[0][1], ',',
                    'M22=', this.m_[1][1], ',',
                    'Dx=', mr(d.x / Z), ',',
                    'Dy=', mr(d.y / Z), '');
  
        // Bounding box calculation (need to minimize displayed area so that
        // filters don't waste time on unused pixels.
        var max = d;
        var c2 = this.getCoords_(dx + dw, dy);
        var c3 = this.getCoords_(dx, dy + dh);
        var c4 = this.getCoords_(dx + dw, dy + dh);
  
        max.x = m.max(max.x, c2.x, c3.x, c4.x);
        max.y = m.max(max.y, c2.y, c3.y, c4.y);
  
        vmlStr.push('padding:0 ', mr(max.x / Z), 'px ', mr(max.y / Z),
                    'px 0;filter:progid:DXImageTransform.Microsoft.Matrix(',
                    filter.join(''), ", sizingmethod='clip');")
      } else {
        vmlStr.push('top:', mr(d.y / Z), 'px;left:', mr(d.x / Z), 'px;');
      }
  
      vmlStr.push(' ">' ,
                  '<g_vml_:image src="', image.src, '"',
                  ' style="width:', Z * dw, 'px;',
                  ' height:', Z * dh, 'px;"',
                  ' cropleft="', sx / w, '"',
                  ' croptop="', sy / h, '"',
                  ' cropright="', (w - sx - sw) / w, '"',
                  ' cropbottom="', (h - sy - sh) / h, '"',
                  ' />',
                  '</g_vml_:group>');
  
      this.element_.insertAdjacentHTML('BeforeEnd',
                                      vmlStr.join(''));
    };
  
    contextPrototype.stroke = function(aFill) {
      var lineStr = [];
      var lineOpen = false;
      var a = processStyle(aFill ? this.fillStyle : this.strokeStyle);
      var color = a.color;
      var opacity = a.alpha * this.globalAlpha;
  
      var W = 10;
      var H = 10;
  
      lineStr.push('<g_vml_:shape',
                   ' filled="', !!aFill, '"',
                   ' style="position:absolute;width:', W, 'px;height:', H, 'px;"',
                   ' coordorigin="0 0" coordsize="', Z * W, ' ', Z * H, '"',
                   ' stroked="', !aFill, '"',
                   ' path="');
  
      var newSeq = false;
      var min = {x: null, y: null};
      var max = {x: null, y: null};
  
      for (var i = 0; i < this.currentPath_.length; i++) {
        var p = this.currentPath_[i];
        var c;
  
        switch (p.type) {
          case 'moveTo':
            c = p;
            lineStr.push(' m ', mr(p.x), ',', mr(p.y));
            break;
          case 'lineTo':
            lineStr.push(' l ', mr(p.x), ',', mr(p.y));
            break;
          case 'close':
            lineStr.push(' x ');
            p = null;
            break;
          case 'bezierCurveTo':
            lineStr.push(' c ',
                         mr(p.cp1x), ',', mr(p.cp1y), ',',
                         mr(p.cp2x), ',', mr(p.cp2y), ',',
                         mr(p.x), ',', mr(p.y));
            break;
          case 'at':
          case 'wa':
            lineStr.push(' ', p.type, ' ',
                         mr(p.x - this.arcScaleX_ * p.radius), ',',
                         mr(p.y - this.arcScaleY_ * p.radius), ' ',
                         mr(p.x + this.arcScaleX_ * p.radius), ',',
                         mr(p.y + this.arcScaleY_ * p.radius), ' ',
                         mr(p.xStart), ',', mr(p.yStart), ' ',
                         mr(p.xEnd), ',', mr(p.yEnd));
            break;
        }
  
  
        // TODO: Following is broken for curves due to
        //       move to proper paths.
  
        // Figure out dimensions so we can do gradient fills
        // properly
        if (p) {
          if (min.x == null || p.x < min.x) {
            min.x = p.x;
          }
          if (max.x == null || p.x > max.x) {
            max.x = p.x;
          }
          if (min.y == null || p.y < min.y) {
            min.y = p.y;
          }
          if (max.y == null || p.y > max.y) {
            max.y = p.y;
          }
        }
      }
      lineStr.push(' ">');
  
      if (!aFill) {
        var lineWidth = this.lineScale_ * this.lineWidth;
  
        // VML cannot correctly render a line if the width is less than 1px.
        // In that case, we dilute the color to make the line look thinner.
        if (lineWidth < 1) {
          opacity *= lineWidth;
        }
  
        lineStr.push(
          '<g_vml_:stroke',
          ' opacity="', opacity, '"',
          ' joinstyle="', this.lineJoin, '"',
          ' miterlimit="', this.miterLimit, '"',
          ' endcap="', processLineCap(this.lineCap), '"',
          ' weight="', lineWidth, 'px"',
          ' color="', color, '" />'
        );
      } else if (typeof this.fillStyle == 'object') {
        var fillStyle = this.fillStyle;
        var angle = 0;
        var focus = {x: 0, y: 0};
  
        // additional offset
        var shift = 0;
        // scale factor for offset
        var expansion = 1;
  
        if (fillStyle.type_ == 'gradient') {
          var x0 = fillStyle.x0_ / this.arcScaleX_;
          var y0 = fillStyle.y0_ / this.arcScaleY_;
          var x1 = fillStyle.x1_ / this.arcScaleX_;
          var y1 = fillStyle.y1_ / this.arcScaleY_;
          var p0 = this.getCoords_(x0, y0);
          var p1 = this.getCoords_(x1, y1);
          var dx = p1.x - p0.x;
          var dy = p1.y - p0.y;
          angle = Math.atan2(dx, dy) * 180 / Math.PI;
  
          // The angle should be a non-negative number.
          if (angle < 0) {
            angle += 360;
          }
  
          // Very small angles produce an unexpected result because they are
          // converted to a scientific notation string.
          if (angle < 1e-6) {
            angle = 0;
          }
        } else {
          var p0 = this.getCoords_(fillStyle.x0_, fillStyle.y0_);
          var width  = max.x - min.x;
          var height = max.y - min.y;
          focus = {
            x: (p0.x - min.x) / width,
            y: (p0.y - min.y) / height
          };
  
          width  /= this.arcScaleX_ * Z;
          height /= this.arcScaleY_ * Z;
          var dimension = m.max(width, height);
          shift = 2 * fillStyle.r0_ / dimension;
          expansion = 2 * fillStyle.r1_ / dimension - shift;
        }
  
        // We need to sort the color stops in ascending order by offset,
        // otherwise IE won't interpret it correctly.
        var stops = fillStyle.colors_;
        
        if (stops) {
  	      stops.sort(function(cs1, cs2) {
  	        return cs1.offset - cs2.offset;
  	      });
  	  
  	      var length = stops.length;
  	      var color1 = stops[0].color;
  	      var color2 = stops[length - 1].color;
  	      var opacity1 = stops[0].alpha * this.globalAlpha;
  	      var opacity2 = stops[length - 1].alpha * this.globalAlpha;
  	
  	      var colors = [];
  	      for (var i = 0; i < length; i++) {
  	        var stop = stops[i];
  	        colors.push(stop.offset * expansion + shift + ' ' + stop.color);
  	      }
  	
  	      // When colors attribute is used, the meanings of opacity and o:opacity2
  	      // are reversed.
  	      lineStr.push('<g_vml_:fill type="', fillStyle.type_, '"',
  	                   ' method="none" focus="100%"',
  	                   ' color="', color1, '"',
  	                   ' color2="', color2, '"',
  	                   ' colors="', colors.join(','), '"',
  	                   ' opacity="', opacity2, '"',
  	                   ' g_o_:opacity2="', opacity1, '"',
  	                   ' angle="', angle, '"',
  	                   ' focusposition="', focus.x, ',', focus.y, '" />');
        }
      } else {
        lineStr.push('<g_vml_:fill color="', color, '" opacity="', opacity,
                     '" />');
      }
  
      lineStr.push('</g_vml_:shape>');
  
      this.element_.insertAdjacentHTML('beforeEnd', lineStr.join(''));
    };
  
    contextPrototype.fill = function() {
      this.stroke(true);
    }
  
    contextPrototype.closePath = function() {
      this.currentPath_.push({type: 'close'});
    };
  
    /**
     * @private
     */
    contextPrototype.getCoords_ = function(aX, aY) {
      var m = this.m_;
      return {
        x: Z * (aX * m[0][0] + aY * m[1][0] + m[2][0]) - Z2,
        y: Z * (aX * m[0][1] + aY * m[1][1] + m[2][1]) - Z2
      }
    };
  
    contextPrototype.save = function() {
      var o = {};
      copyState(this, o);
      this.aStack_.push(o);
      this.mStack_.push(this.m_);
      this.m_ = matrixMultiply(createMatrixIdentity(), this.m_);
    };
  
    contextPrototype.restore = function() {
      copyState(this.aStack_.pop(), this);
      this.m_ = this.mStack_.pop();
    };
  
    function matrixIsFinite(m) {
      for (var j = 0; j < 3; j++) {
        for (var k = 0; k < 2; k++) {
          if (!isFinite(m[j][k]) || isNaN(m[j][k])) {
            return false;
          }
        }
      }
      return true;
    }
  
    function setM(ctx, m, updateLineScale) {
      if (!matrixIsFinite(m)) {
        return;
      }
      ctx.m_ = m;
  
      if (updateLineScale) {
        // Get the line scale.
        // Determinant of this.m_ means how much the area is enlarged by the
        // transformation. So its square root can be used as a scale factor
        // for width.
        var det = m[0][0] * m[1][1] - m[0][1] * m[1][0];
        ctx.lineScale_ = sqrt(abs(det));
      }
    }
  
    contextPrototype.translate = function(aX, aY) {
      var m1 = [
        [1,  0,  0],
        [0,  1,  0],
        [aX, aY, 1]
      ];
  
      setM(this, matrixMultiply(m1, this.m_), false);
    };
  
    contextPrototype.rotate = function(aRot) {
      var c = mc(aRot);
      var s = ms(aRot);
  
      var m1 = [
        [c,  s, 0],
        [-s, c, 0],
        [0,  0, 1]
      ];
  
      setM(this, matrixMultiply(m1, this.m_), false);
    };
  
    contextPrototype.scale = function(aX, aY) {
      this.arcScaleX_ *= aX;
      this.arcScaleY_ *= aY;
      var m1 = [
        [aX, 0,  0],
        [0,  aY, 0],
        [0,  0,  1]
      ];
  
      setM(this, matrixMultiply(m1, this.m_), true);
    };
  
    contextPrototype.transform = function(m11, m12, m21, m22, dx, dy) {
      var m1 = [
        [m11, m12, 0],
        [m21, m22, 0],
        [dx,  dy,  1]
      ];
  
      setM(this, matrixMultiply(m1, this.m_), true);
    };
  
    contextPrototype.setTransform = function(m11, m12, m21, m22, dx, dy) {
      var m = [
        [m11, m12, 0],
        [m21, m22, 0],
        [dx,  dy,  1]
      ];
  
      setM(this, m, true);
    };
  
    /******** STUBS ********/
    contextPrototype.clip = function() {
      // TODO: Implement
    };
  
    contextPrototype.arcTo = function() {
      // TODO: Implement
    };
  
    contextPrototype.createPattern = function() {
      return new CanvasPattern_;
    };
  
    // Gradient / Pattern Stubs
    function CanvasGradient_(aType) {
      this.type_ = aType;
      this.x0_ = 0;
      this.y0_ = 0;
      this.r0_ = 0;
      this.x1_ = 0;
      this.y1_ = 0;
      this.r1_ = 0;
      this.colors_ = [];
    }
  
    CanvasGradient_.prototype.addColorStop = function(aOffset, aColor) {
      aColor = processStyle(aColor);
      this.colors_.push({offset: aOffset,
                         color: aColor.color,
                         alpha: aColor.alpha});
    };
  
    function CanvasPattern_() {}
  
    // set up externs
    G_vmlCanvasManager = G_vmlCanvasManager_;
    CanvasRenderingContext2D = CanvasRenderingContext2D_;
    CanvasGradient = CanvasGradient_;
    CanvasPattern = CanvasPattern_;
  
  })();
  
  } // if
  