+
−// 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_;
+
−      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