1 // Copyright 2006 Google Inc. |
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2 // |
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3 // Licensed under the Apache License, Version 2.0 (the "License"); |
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4 // you may not use this file except in compliance with the License. |
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5 // You may obtain a copy of the License at |
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6 // |
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7 // http://www.apache.org/licenses/LICENSE-2.0 |
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8 // |
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9 // Unless required by applicable law or agreed to in writing, software |
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10 // distributed under the License is distributed on an "AS IS" BASIS, |
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11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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12 // See the License for the specific language governing permissions and |
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13 // limitations under the License. |
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14 |
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15 |
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16 // Known Issues: |
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17 // |
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18 // * Patterns are not implemented. |
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19 // * Radial gradient are not implemented. The VML version of these look very |
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20 // different from the canvas one. |
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21 // * Clipping paths are not implemented. |
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22 // * Coordsize. The width and height attribute have higher priority than the |
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23 // width and height style values which isn't correct. |
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24 // * Painting mode isn't implemented. |
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25 // * Canvas width/height should is using content-box by default. IE in |
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26 // Quirks mode will draw the canvas using border-box. Either change your |
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27 // doctype to HTML5 |
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28 // (http://www.whatwg.org/specs/web-apps/current-work/#the-doctype) |
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29 // or use Box Sizing Behavior from WebFX |
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30 // (http://webfx.eae.net/dhtml/boxsizing/boxsizing.html) |
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31 // * Non uniform scaling does not correctly scale strokes. |
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32 // * Optimize. There is always room for speed improvements. |
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33 |
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34 // Only add this code if we do not already have a canvas implementation |
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35 if (!document.createElement('canvas').getContext) { |
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36 |
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37 (function() { |
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38 |
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39 // alias some functions to make (compiled) code shorter |
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40 var m = Math; |
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41 var mr = m.round; |
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42 var ms = m.sin; |
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43 var mc = m.cos; |
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44 var abs = m.abs; |
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45 var sqrt = m.sqrt; |
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46 |
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47 // this is used for sub pixel precision |
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48 var Z = 10; |
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49 var Z2 = Z / 2; |
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50 |
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51 /** |
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52 * This funtion is assigned to the <canvas> elements as element.getContext(). |
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53 * @this {HTMLElement} |
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54 * @return {CanvasRenderingContext2D_} |
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55 */ |
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56 function getContext() { |
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57 return this.context_ || |
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58 (this.context_ = new CanvasRenderingContext2D_(this)); |
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59 } |
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60 |
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61 var slice = Array.prototype.slice; |
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62 |
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63 /** |
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64 * Binds a function to an object. The returned function will always use the |
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65 * passed in {@code obj} as {@code this}. |
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66 * |
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67 * Example: |
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68 * |
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69 * g = bind(f, obj, a, b) |
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70 * g(c, d) // will do f.call(obj, a, b, c, d) |
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71 * |
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72 * @param {Function} f The function to bind the object to |
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73 * @param {Object} obj The object that should act as this when the function |
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74 * is called |
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75 * @param {*} var_args Rest arguments that will be used as the initial |
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76 * arguments when the function is called |
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77 * @return {Function} A new function that has bound this |
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78 */ |
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79 function bind(f, obj, var_args) { |
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80 var a = slice.call(arguments, 2); |
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81 return function() { |
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82 return f.apply(obj, a.concat(slice.call(arguments))); |
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83 }; |
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84 } |
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85 |
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86 var G_vmlCanvasManager_ = { |
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87 init: function(opt_doc) { |
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88 if (/MSIE/.test(navigator.userAgent) && !window.opera) { |
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89 var doc = opt_doc || document; |
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90 // Create a dummy element so that IE will allow canvas elements to be |
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91 // recognized. |
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92 doc.createElement('canvas'); |
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93 doc.attachEvent('onreadystatechange', bind(this.init_, this, doc)); |
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94 } |
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95 }, |
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96 |
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97 init_: function(doc) { |
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98 // create xmlns |
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99 if (!doc.namespaces['g_vml_']) { |
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100 doc.namespaces.add('g_vml_', 'urn:schemas-microsoft-com:vml', |
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101 '#default#VML'); |
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102 |
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103 } |
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104 if (!doc.namespaces['g_o_']) { |
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105 doc.namespaces.add('g_o_', 'urn:schemas-microsoft-com:office:office', |
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106 '#default#VML'); |
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107 } |
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108 |
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109 // Setup default CSS. Only add one style sheet per document |
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110 if (!doc.styleSheets['ex_canvas_']) { |
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111 var ss = doc.createStyleSheet(); |
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112 ss.owningElement.id = 'ex_canvas_'; |
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113 ss.cssText = 'canvas{display:inline-block;overflow:hidden;' + |
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114 // default size is 300x150 in Gecko and Opera |
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115 'text-align:left;width:300px;height:150px}' + |
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116 'g_vml_\\:*{behavior:url(#default#VML)}' + |
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117 'g_o_\\:*{behavior:url(#default#VML)}'; |
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118 |
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119 } |
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120 |
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121 // find all canvas elements |
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122 var els = doc.getElementsByTagName('canvas'); |
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123 for (var i = 0; i < els.length; i++) { |
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124 this.initElement(els[i]); |
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125 } |
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126 }, |
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127 |
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128 /** |
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129 * Public initializes a canvas element so that it can be used as canvas |
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130 * element from now on. This is called automatically before the page is |
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131 * loaded but if you are creating elements using createElement you need to |
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132 * make sure this is called on the element. |
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133 * @param {HTMLElement} el The canvas element to initialize. |
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134 * @return {HTMLElement} the element that was created. |
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135 */ |
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136 initElement: function(el) { |
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137 if (!el.getContext) { |
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138 |
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139 el.getContext = getContext; |
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140 |
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141 // Remove fallback content. There is no way to hide text nodes so we |
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142 // just remove all childNodes. We could hide all elements and remove |
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143 // text nodes but who really cares about the fallback content. |
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144 el.innerHTML = ''; |
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145 |
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146 // do not use inline function because that will leak memory |
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147 el.attachEvent('onpropertychange', onPropertyChange); |
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148 el.attachEvent('onresize', onResize); |
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149 |
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150 var attrs = el.attributes; |
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151 if (attrs.width && attrs.width.specified) { |
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152 // TODO: use runtimeStyle and coordsize |
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153 // el.getContext().setWidth_(attrs.width.nodeValue); |
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154 el.style.width = attrs.width.nodeValue + 'px'; |
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155 } else { |
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156 el.width = el.clientWidth; |
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157 } |
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158 if (attrs.height && attrs.height.specified) { |
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159 // TODO: use runtimeStyle and coordsize |
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160 // el.getContext().setHeight_(attrs.height.nodeValue); |
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161 el.style.height = attrs.height.nodeValue + 'px'; |
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162 } else { |
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163 el.height = el.clientHeight; |
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164 } |
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165 //el.getContext().setCoordsize_() |
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166 } |
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167 return el; |
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168 } |
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169 }; |
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170 |
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171 function onPropertyChange(e) { |
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172 var el = e.srcElement; |
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173 |
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174 switch (e.propertyName) { |
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175 case 'width': |
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176 el.style.width = el.attributes.width.nodeValue + 'px'; |
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177 el.getContext().clearRect(); |
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178 break; |
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179 case 'height': |
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180 el.style.height = el.attributes.height.nodeValue + 'px'; |
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181 el.getContext().clearRect(); |
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182 break; |
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183 } |
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184 } |
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185 |
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186 function onResize(e) { |
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187 var el = e.srcElement; |
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188 if (el.firstChild) { |
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189 el.firstChild.style.width = el.clientWidth + 'px'; |
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190 el.firstChild.style.height = el.clientHeight + 'px'; |
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191 } |
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192 } |
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193 |
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194 G_vmlCanvasManager_.init(); |
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195 |
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196 // precompute "00" to "FF" |
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197 var dec2hex = []; |
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198 for (var i = 0; i < 16; i++) { |
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199 for (var j = 0; j < 16; j++) { |
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200 dec2hex[i * 16 + j] = i.toString(16) + j.toString(16); |
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201 } |
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202 } |
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203 |
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204 function createMatrixIdentity() { |
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205 return [ |
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206 [1, 0, 0], |
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207 [0, 1, 0], |
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208 [0, 0, 1] |
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209 ]; |
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210 } |
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211 |
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212 function matrixMultiply(m1, m2) { |
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213 var result = createMatrixIdentity(); |
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214 |
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215 for (var x = 0; x < 3; x++) { |
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216 for (var y = 0; y < 3; y++) { |
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217 var sum = 0; |
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218 |
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219 for (var z = 0; z < 3; z++) { |
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220 sum += m1[x][z] * m2[z][y]; |
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221 } |
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222 |
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223 result[x][y] = sum; |
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224 } |
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225 } |
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226 return result; |
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227 } |
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228 |
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229 function copyState(o1, o2) { |
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230 o2.fillStyle = o1.fillStyle; |
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231 o2.lineCap = o1.lineCap; |
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232 o2.lineJoin = o1.lineJoin; |
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233 o2.lineWidth = o1.lineWidth; |
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234 o2.miterLimit = o1.miterLimit; |
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235 o2.shadowBlur = o1.shadowBlur; |
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236 o2.shadowColor = o1.shadowColor; |
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237 o2.shadowOffsetX = o1.shadowOffsetX; |
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238 o2.shadowOffsetY = o1.shadowOffsetY; |
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239 o2.strokeStyle = o1.strokeStyle; |
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240 o2.globalAlpha = o1.globalAlpha; |
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241 o2.arcScaleX_ = o1.arcScaleX_; |
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242 o2.arcScaleY_ = o1.arcScaleY_; |
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243 o2.lineScale_ = o1.lineScale_; |
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244 } |
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245 |
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246 function processStyle(styleString) { |
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247 var str, alpha = 1; |
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248 |
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249 styleString = String(styleString); |
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250 if (styleString.substring(0, 3) == 'rgb') { |
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251 var start = styleString.indexOf('(', 3); |
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252 var end = styleString.indexOf(')', start + 1); |
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253 var guts = styleString.substring(start + 1, end).split(','); |
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254 |
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255 str = '#'; |
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256 for (var i = 0; i < 3; i++) { |
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257 str += dec2hex[Number(guts[i])]; |
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258 } |
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259 |
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260 if (guts.length == 4 && styleString.substr(3, 1) == 'a') { |
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261 alpha = guts[3]; |
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262 } |
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263 } else { |
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264 str = styleString; |
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265 } |
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266 |
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267 return {color: str, alpha: alpha}; |
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268 } |
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269 |
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270 function processLineCap(lineCap) { |
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271 switch (lineCap) { |
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272 case 'butt': |
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273 return 'flat'; |
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274 case 'round': |
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275 return 'round'; |
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276 case 'square': |
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277 default: |
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278 return 'square'; |
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279 } |
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280 } |
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281 |
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282 /** |
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283 * This class implements CanvasRenderingContext2D interface as described by |
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284 * the WHATWG. |
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285 * @param {HTMLElement} surfaceElement The element that the 2D context should |
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286 * be associated with |
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287 */ |
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288 function CanvasRenderingContext2D_(surfaceElement) { |
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289 this.m_ = createMatrixIdentity(); |
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290 |
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291 this.mStack_ = []; |
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292 this.aStack_ = []; |
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293 this.currentPath_ = []; |
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294 |
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295 // Canvas context properties |
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296 this.strokeStyle = '#000'; |
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297 this.fillStyle = '#000'; |
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298 |
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299 this.lineWidth = 1; |
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300 this.lineJoin = 'miter'; |
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301 this.lineCap = 'butt'; |
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302 this.miterLimit = Z * 1; |
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303 this.globalAlpha = 1; |
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304 this.canvas = surfaceElement; |
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305 |
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306 var el = surfaceElement.ownerDocument.createElement('div'); |
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307 el.style.width = surfaceElement.clientWidth + 'px'; |
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308 el.style.height = surfaceElement.clientHeight + 'px'; |
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309 el.style.overflow = 'hidden'; |
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310 el.style.position = 'absolute'; |
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311 surfaceElement.appendChild(el); |
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312 |
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313 this.element_ = el; |
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314 this.arcScaleX_ = 1; |
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315 this.arcScaleY_ = 1; |
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316 this.lineScale_ = 1; |
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317 } |
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318 |
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319 var contextPrototype = CanvasRenderingContext2D_.prototype; |
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320 contextPrototype.clearRect = function() { |
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321 this.element_.innerHTML = ''; |
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322 }; |
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323 |
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324 contextPrototype.beginPath = function() { |
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325 // TODO: Branch current matrix so that save/restore has no effect |
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326 // as per safari docs. |
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327 this.currentPath_ = []; |
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328 }; |
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329 |
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330 contextPrototype.moveTo = function(aX, aY) { |
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331 var p = this.getCoords_(aX, aY); |
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332 this.currentPath_.push({type: 'moveTo', x: p.x, y: p.y}); |
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333 this.currentX_ = p.x; |
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334 this.currentY_ = p.y; |
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335 }; |
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336 |
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337 contextPrototype.lineTo = function(aX, aY) { |
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338 var p = this.getCoords_(aX, aY); |
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339 this.currentPath_.push({type: 'lineTo', x: p.x, y: p.y}); |
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340 |
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341 this.currentX_ = p.x; |
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342 this.currentY_ = p.y; |
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343 }; |
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344 |
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345 contextPrototype.bezierCurveTo = function(aCP1x, aCP1y, |
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346 aCP2x, aCP2y, |
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347 aX, aY) { |
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348 var p = this.getCoords_(aX, aY); |
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349 var cp1 = this.getCoords_(aCP1x, aCP1y); |
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350 var cp2 = this.getCoords_(aCP2x, aCP2y); |
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351 bezierCurveTo(this, cp1, cp2, p); |
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352 }; |
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353 |
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354 // Helper function that takes the already fixed cordinates. |
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355 function bezierCurveTo(self, cp1, cp2, p) { |
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356 self.currentPath_.push({ |
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357 type: 'bezierCurveTo', |
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358 cp1x: cp1.x, |
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359 cp1y: cp1.y, |
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360 cp2x: cp2.x, |
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361 cp2y: cp2.y, |
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362 x: p.x, |
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363 y: p.y |
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364 }); |
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365 self.currentX_ = p.x; |
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366 self.currentY_ = p.y; |
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367 } |
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368 |
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369 contextPrototype.quadraticCurveTo = function(aCPx, aCPy, aX, aY) { |
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370 // the following is lifted almost directly from |
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371 // http://developer.mozilla.org/en/docs/Canvas_tutorial:Drawing_shapes |
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372 |
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373 var cp = this.getCoords_(aCPx, aCPy); |
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374 var p = this.getCoords_(aX, aY); |
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375 |
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376 var cp1 = { |
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377 x: this.currentX_ + 2.0 / 3.0 * (cp.x - this.currentX_), |
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378 y: this.currentY_ + 2.0 / 3.0 * (cp.y - this.currentY_) |
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379 }; |
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380 var cp2 = { |
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381 x: cp1.x + (p.x - this.currentX_) / 3.0, |
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382 y: cp1.y + (p.y - this.currentY_) / 3.0 |
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383 }; |
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384 |
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385 bezierCurveTo(this, cp1, cp2, p); |
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386 }; |
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387 |
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388 contextPrototype.arc = function(aX, aY, aRadius, |
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389 aStartAngle, aEndAngle, aClockwise) { |
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390 aRadius *= Z; |
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391 var arcType = aClockwise ? 'at' : 'wa'; |
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392 |
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393 var xStart = aX + mc(aStartAngle) * aRadius - Z2; |
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394 var yStart = aY + ms(aStartAngle) * aRadius - Z2; |
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395 |
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396 var xEnd = aX + mc(aEndAngle) * aRadius - Z2; |
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397 var yEnd = aY + ms(aEndAngle) * aRadius - Z2; |
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398 |
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399 // IE won't render arches drawn counter clockwise if xStart == xEnd. |
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400 if (xStart == xEnd && !aClockwise) { |
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401 xStart += 0.125; // Offset xStart by 1/80 of a pixel. Use something |
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402 // that can be represented in binary |
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403 } |
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404 |
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405 var p = this.getCoords_(aX, aY); |
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406 var pStart = this.getCoords_(xStart, yStart); |
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407 var pEnd = this.getCoords_(xEnd, yEnd); |
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408 |
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409 this.currentPath_.push({type: arcType, |
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410 x: p.x, |
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411 y: p.y, |
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412 radius: aRadius, |
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413 xStart: pStart.x, |
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414 yStart: pStart.y, |
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415 xEnd: pEnd.x, |
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416 yEnd: pEnd.y}); |
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417 |
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418 }; |
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419 |
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420 contextPrototype.rect = function(aX, aY, aWidth, aHeight) { |
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421 this.moveTo(aX, aY); |
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422 this.lineTo(aX + aWidth, aY); |
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423 this.lineTo(aX + aWidth, aY + aHeight); |
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424 this.lineTo(aX, aY + aHeight); |
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425 this.closePath(); |
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426 }; |
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427 |
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428 contextPrototype.strokeRect = function(aX, aY, aWidth, aHeight) { |
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429 var oldPath = this.currentPath_; |
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430 this.beginPath(); |
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431 |
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432 this.moveTo(aX, aY); |
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433 this.lineTo(aX + aWidth, aY); |
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434 this.lineTo(aX + aWidth, aY + aHeight); |
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435 this.lineTo(aX, aY + aHeight); |
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436 this.closePath(); |
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437 this.stroke(); |
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438 |
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439 this.currentPath_ = oldPath; |
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440 }; |
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441 |
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442 contextPrototype.fillRect = function(aX, aY, aWidth, aHeight) { |
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443 var oldPath = this.currentPath_; |
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444 this.beginPath(); |
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445 |
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446 this.moveTo(aX, aY); |
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447 this.lineTo(aX + aWidth, aY); |
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448 this.lineTo(aX + aWidth, aY + aHeight); |
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449 this.lineTo(aX, aY + aHeight); |
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450 this.closePath(); |
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451 this.fill(); |
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452 |
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453 this.currentPath_ = oldPath; |
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454 }; |
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455 |
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456 contextPrototype.createLinearGradient = function(aX0, aY0, aX1, aY1) { |
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457 var gradient = new CanvasGradient_('gradient'); |
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458 gradient.x0_ = aX0; |
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459 gradient.y0_ = aY0; |
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460 gradient.x1_ = aX1; |
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461 gradient.y1_ = aY1; |
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462 return gradient; |
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463 }; |
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464 |
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465 contextPrototype.createRadialGradient = function(aX0, aY0, aR0, |
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466 aX1, aY1, aR1) { |
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467 var gradient = new CanvasGradient_('gradientradial'); |
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468 gradient.x0_ = aX0; |
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469 gradient.y0_ = aY0; |
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470 gradient.r0_ = aR0; |
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471 gradient.x1_ = aX1; |
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472 gradient.y1_ = aY1; |
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473 gradient.r1_ = aR1; |
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474 return gradient; |
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475 }; |
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476 |
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477 contextPrototype.drawImage = function(image, var_args) { |
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478 var dx, dy, dw, dh, sx, sy, sw, sh; |
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479 |
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480 // to find the original width we overide the width and height |
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481 var oldRuntimeWidth = image.runtimeStyle.width; |
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482 var oldRuntimeHeight = image.runtimeStyle.height; |
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483 image.runtimeStyle.width = 'auto'; |
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484 image.runtimeStyle.height = 'auto'; |
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485 |
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486 // get the original size |
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487 var w = image.width; |
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488 var h = image.height; |
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489 |
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490 // and remove overides |
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491 image.runtimeStyle.width = oldRuntimeWidth; |
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492 image.runtimeStyle.height = oldRuntimeHeight; |
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493 |
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494 if (arguments.length == 3) { |
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495 dx = arguments[1]; |
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496 dy = arguments[2]; |
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497 sx = sy = 0; |
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498 sw = dw = w; |
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499 sh = dh = h; |
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500 } else if (arguments.length == 5) { |
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501 dx = arguments[1]; |
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502 dy = arguments[2]; |
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503 dw = arguments[3]; |
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504 dh = arguments[4]; |
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505 sx = sy = 0; |
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506 sw = w; |
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507 sh = h; |
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508 } else if (arguments.length == 9) { |
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509 sx = arguments[1]; |
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510 sy = arguments[2]; |
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511 sw = arguments[3]; |
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512 sh = arguments[4]; |
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513 dx = arguments[5]; |
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514 dy = arguments[6]; |
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515 dw = arguments[7]; |
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516 dh = arguments[8]; |
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517 } else { |
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518 throw Error('Invalid number of arguments'); |
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519 } |
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520 |
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521 var d = this.getCoords_(dx, dy); |
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522 |
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523 var w2 = sw / 2; |
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524 var h2 = sh / 2; |
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525 |
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526 var vmlStr = []; |
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527 |
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528 var W = 10; |
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529 var H = 10; |
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530 |
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531 // For some reason that I've now forgotten, using divs didn't work |
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532 vmlStr.push(' <g_vml_:group', |
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533 ' coordsize="', Z * W, ',', Z * H, '"', |
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534 ' coordorigin="0,0"' , |
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535 ' style="width:', W, 'px;height:', H, 'px;position:absolute;'); |
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536 |
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537 // If filters are necessary (rotation exists), create them |
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538 // filters are bog-slow, so only create them if abbsolutely necessary |
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539 // The following check doesn't account for skews (which don't exist |
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540 // in the canvas spec (yet) anyway. |
|
541 |
|
542 if (this.m_[0][0] != 1 || this.m_[0][1]) { |
|
543 var filter = []; |
|
544 |
|
545 // Note the 12/21 reversal |
|
546 filter.push('M11=', this.m_[0][0], ',', |
|
547 'M12=', this.m_[1][0], ',', |
|
548 'M21=', this.m_[0][1], ',', |
|
549 'M22=', this.m_[1][1], ',', |
|
550 'Dx=', mr(d.x / Z), ',', |
|
551 'Dy=', mr(d.y / Z), ''); |
|
552 |
|
553 // Bounding box calculation (need to minimize displayed area so that |
|
554 // filters don't waste time on unused pixels. |
|
555 var max = d; |
|
556 var c2 = this.getCoords_(dx + dw, dy); |
|
557 var c3 = this.getCoords_(dx, dy + dh); |
|
558 var c4 = this.getCoords_(dx + dw, dy + dh); |
|
559 |
|
560 max.x = m.max(max.x, c2.x, c3.x, c4.x); |
|
561 max.y = m.max(max.y, c2.y, c3.y, c4.y); |
|
562 |
|
563 vmlStr.push('padding:0 ', mr(max.x / Z), 'px ', mr(max.y / Z), |
|
564 'px 0;filter:progid:DXImageTransform.Microsoft.Matrix(', |
|
565 filter.join(''), ", sizingmethod='clip');") |
|
566 } else { |
|
567 vmlStr.push('top:', mr(d.y / Z), 'px;left:', mr(d.x / Z), 'px;'); |
|
568 } |
|
569 |
|
570 vmlStr.push(' ">' , |
|
571 '<g_vml_:image src="', image.src, '"', |
|
572 ' style="width:', Z * dw, 'px;', |
|
573 ' height:', Z * dh, 'px;"', |
|
574 ' cropleft="', sx / w, '"', |
|
575 ' croptop="', sy / h, '"', |
|
576 ' cropright="', (w - sx - sw) / w, '"', |
|
577 ' cropbottom="', (h - sy - sh) / h, '"', |
|
578 ' />', |
|
579 '</g_vml_:group>'); |
|
580 |
|
581 this.element_.insertAdjacentHTML('BeforeEnd', |
|
582 vmlStr.join('')); |
|
583 }; |
|
584 |
|
585 contextPrototype.stroke = function(aFill) { |
|
586 var lineStr = []; |
|
587 var lineOpen = false; |
|
588 var a = processStyle(aFill ? this.fillStyle : this.strokeStyle); |
|
589 var color = a.color; |
|
590 var opacity = a.alpha * this.globalAlpha; |
|
591 |
|
592 var W = 10; |
|
593 var H = 10; |
|
594 |
|
595 lineStr.push('<g_vml_:shape', |
|
596 ' filled="', !!aFill, '"', |
|
597 ' style="position:absolute;width:', W, 'px;height:', H, 'px;"', |
|
598 ' coordorigin="0 0" coordsize="', Z * W, ' ', Z * H, '"', |
|
599 ' stroked="', !aFill, '"', |
|
600 ' path="'); |
|
601 |
|
602 var newSeq = false; |
|
603 var min = {x: null, y: null}; |
|
604 var max = {x: null, y: null}; |
|
605 |
|
606 for (var i = 0; i < this.currentPath_.length; i++) { |
|
607 var p = this.currentPath_[i]; |
|
608 var c; |
|
609 |
|
610 switch (p.type) { |
|
611 case 'moveTo': |
|
612 c = p; |
|
613 lineStr.push(' m ', mr(p.x), ',', mr(p.y)); |
|
614 break; |
|
615 case 'lineTo': |
|
616 lineStr.push(' l ', mr(p.x), ',', mr(p.y)); |
|
617 break; |
|
618 case 'close': |
|
619 lineStr.push(' x '); |
|
620 p = null; |
|
621 break; |
|
622 case 'bezierCurveTo': |
|
623 lineStr.push(' c ', |
|
624 mr(p.cp1x), ',', mr(p.cp1y), ',', |
|
625 mr(p.cp2x), ',', mr(p.cp2y), ',', |
|
626 mr(p.x), ',', mr(p.y)); |
|
627 break; |
|
628 case 'at': |
|
629 case 'wa': |
|
630 lineStr.push(' ', p.type, ' ', |
|
631 mr(p.x - this.arcScaleX_ * p.radius), ',', |
|
632 mr(p.y - this.arcScaleY_ * p.radius), ' ', |
|
633 mr(p.x + this.arcScaleX_ * p.radius), ',', |
|
634 mr(p.y + this.arcScaleY_ * p.radius), ' ', |
|
635 mr(p.xStart), ',', mr(p.yStart), ' ', |
|
636 mr(p.xEnd), ',', mr(p.yEnd)); |
|
637 break; |
|
638 } |
|
639 |
|
640 |
|
641 // TODO: Following is broken for curves due to |
|
642 // move to proper paths. |
|
643 |
|
644 // Figure out dimensions so we can do gradient fills |
|
645 // properly |
|
646 if (p) { |
|
647 if (min.x == null || p.x < min.x) { |
|
648 min.x = p.x; |
|
649 } |
|
650 if (max.x == null || p.x > max.x) { |
|
651 max.x = p.x; |
|
652 } |
|
653 if (min.y == null || p.y < min.y) { |
|
654 min.y = p.y; |
|
655 } |
|
656 if (max.y == null || p.y > max.y) { |
|
657 max.y = p.y; |
|
658 } |
|
659 } |
|
660 } |
|
661 lineStr.push(' ">'); |
|
662 |
|
663 if (!aFill) { |
|
664 var lineWidth = this.lineScale_ * this.lineWidth; |
|
665 |
|
666 // VML cannot correctly render a line if the width is less than 1px. |
|
667 // In that case, we dilute the color to make the line look thinner. |
|
668 if (lineWidth < 1) { |
|
669 opacity *= lineWidth; |
|
670 } |
|
671 |
|
672 lineStr.push( |
|
673 '<g_vml_:stroke', |
|
674 ' opacity="', opacity, '"', |
|
675 ' joinstyle="', this.lineJoin, '"', |
|
676 ' miterlimit="', this.miterLimit, '"', |
|
677 ' endcap="', processLineCap(this.lineCap), '"', |
|
678 ' weight="', lineWidth, 'px"', |
|
679 ' color="', color, '" />' |
|
680 ); |
|
681 } else if (typeof this.fillStyle == 'object') { |
|
682 var fillStyle = this.fillStyle; |
|
683 var angle = 0; |
|
684 var focus = {x: 0, y: 0}; |
|
685 |
|
686 // additional offset |
|
687 var shift = 0; |
|
688 // scale factor for offset |
|
689 var expansion = 1; |
|
690 |
|
691 if (fillStyle.type_ == 'gradient') { |
|
692 var x0 = fillStyle.x0_ / this.arcScaleX_; |
|
693 var y0 = fillStyle.y0_ / this.arcScaleY_; |
|
694 var x1 = fillStyle.x1_ / this.arcScaleX_; |
|
695 var y1 = fillStyle.y1_ / this.arcScaleY_; |
|
696 var p0 = this.getCoords_(x0, y0); |
|
697 var p1 = this.getCoords_(x1, y1); |
|
698 var dx = p1.x - p0.x; |
|
699 var dy = p1.y - p0.y; |
|
700 angle = Math.atan2(dx, dy) * 180 / Math.PI; |
|
701 |
|
702 // The angle should be a non-negative number. |
|
703 if (angle < 0) { |
|
704 angle += 360; |
|
705 } |
|
706 |
|
707 // Very small angles produce an unexpected result because they are |
|
708 // converted to a scientific notation string. |
|
709 if (angle < 1e-6) { |
|
710 angle = 0; |
|
711 } |
|
712 } else { |
|
713 var p0 = this.getCoords_(fillStyle.x0_, fillStyle.y0_); |
|
714 var width = max.x - min.x; |
|
715 var height = max.y - min.y; |
|
716 focus = { |
|
717 x: (p0.x - min.x) / width, |
|
718 y: (p0.y - min.y) / height |
|
719 }; |
|
720 |
|
721 width /= this.arcScaleX_ * Z; |
|
722 height /= this.arcScaleY_ * Z; |
|
723 var dimension = m.max(width, height); |
|
724 shift = 2 * fillStyle.r0_ / dimension; |
|
725 expansion = 2 * fillStyle.r1_ / dimension - shift; |
|
726 } |
|
727 |
|
728 // We need to sort the color stops in ascending order by offset, |
|
729 // otherwise IE won't interpret it correctly. |
|
730 var stops = fillStyle.colors_; |
|
731 stops.sort(function(cs1, cs2) { |
|
732 return cs1.offset - cs2.offset; |
|
733 }); |
|
734 |
|
735 var length = stops.length; |
|
736 var color1 = stops[0].color; |
|
737 var color2 = stops[length - 1].color; |
|
738 var opacity1 = stops[0].alpha * this.globalAlpha; |
|
739 var opacity2 = stops[length - 1].alpha * this.globalAlpha; |
|
740 |
|
741 var colors = []; |
|
742 for (var i = 0; i < length; i++) { |
|
743 var stop = stops[i]; |
|
744 colors.push(stop.offset * expansion + shift + ' ' + stop.color); |
|
745 } |
|
746 |
|
747 // When colors attribute is used, the meanings of opacity and o:opacity2 |
|
748 // are reversed. |
|
749 lineStr.push('<g_vml_:fill type="', fillStyle.type_, '"', |
|
750 ' method="none" focus="100%"', |
|
751 ' color="', color1, '"', |
|
752 ' color2="', color2, '"', |
|
753 ' colors="', colors.join(','), '"', |
|
754 ' opacity="', opacity2, '"', |
|
755 ' g_o_:opacity2="', opacity1, '"', |
|
756 ' angle="', angle, '"', |
|
757 ' focusposition="', focus.x, ',', focus.y, '" />'); |
|
758 } else { |
|
759 lineStr.push('<g_vml_:fill color="', color, '" opacity="', opacity, |
|
760 '" />'); |
|
761 } |
|
762 |
|
763 lineStr.push('</g_vml_:shape>'); |
|
764 |
|
765 this.element_.insertAdjacentHTML('beforeEnd', lineStr.join('')); |
|
766 }; |
|
767 |
|
768 contextPrototype.fill = function() { |
|
769 this.stroke(true); |
|
770 } |
|
771 |
|
772 contextPrototype.closePath = function() { |
|
773 this.currentPath_.push({type: 'close'}); |
|
774 }; |
|
775 |
|
776 /** |
|
777 * @private |
|
778 */ |
|
779 contextPrototype.getCoords_ = function(aX, aY) { |
|
780 var m = this.m_; |
|
781 return { |
|
782 x: Z * (aX * m[0][0] + aY * m[1][0] + m[2][0]) - Z2, |
|
783 y: Z * (aX * m[0][1] + aY * m[1][1] + m[2][1]) - Z2 |
|
784 } |
|
785 }; |
|
786 |
|
787 contextPrototype.save = function() { |
|
788 var o = {}; |
|
789 copyState(this, o); |
|
790 this.aStack_.push(o); |
|
791 this.mStack_.push(this.m_); |
|
792 this.m_ = matrixMultiply(createMatrixIdentity(), this.m_); |
|
793 }; |
|
794 |
|
795 contextPrototype.restore = function() { |
|
796 copyState(this.aStack_.pop(), this); |
|
797 this.m_ = this.mStack_.pop(); |
|
798 }; |
|
799 |
|
800 function matrixIsFinite(m) { |
|
801 for (var j = 0; j < 3; j++) { |
|
802 for (var k = 0; k < 2; k++) { |
|
803 if (!isFinite(m[j][k]) || isNaN(m[j][k])) { |
|
804 return false; |
|
805 } |
|
806 } |
|
807 } |
|
808 return true; |
|
809 } |
|
810 |
|
811 function setM(ctx, m, updateLineScale) { |
|
812 if (!matrixIsFinite(m)) { |
|
813 return; |
|
814 } |
|
815 ctx.m_ = m; |
|
816 |
|
817 if (updateLineScale) { |
|
818 // Get the line scale. |
|
819 // Determinant of this.m_ means how much the area is enlarged by the |
|
820 // transformation. So its square root can be used as a scale factor |
|
821 // for width. |
|
822 var det = m[0][0] * m[1][1] - m[0][1] * m[1][0]; |
|
823 ctx.lineScale_ = sqrt(abs(det)); |
|
824 } |
|
825 } |
|
826 |
|
827 contextPrototype.translate = function(aX, aY) { |
|
828 var m1 = [ |
|
829 [1, 0, 0], |
|
830 [0, 1, 0], |
|
831 [aX, aY, 1] |
|
832 ]; |
|
833 |
|
834 setM(this, matrixMultiply(m1, this.m_), false); |
|
835 }; |
|
836 |
|
837 contextPrototype.rotate = function(aRot) { |
|
838 var c = mc(aRot); |
|
839 var s = ms(aRot); |
|
840 |
|
841 var m1 = [ |
|
842 [c, s, 0], |
|
843 [-s, c, 0], |
|
844 [0, 0, 1] |
|
845 ]; |
|
846 |
|
847 setM(this, matrixMultiply(m1, this.m_), false); |
|
848 }; |
|
849 |
|
850 contextPrototype.scale = function(aX, aY) { |
|
851 this.arcScaleX_ *= aX; |
|
852 this.arcScaleY_ *= aY; |
|
853 var m1 = [ |
|
854 [aX, 0, 0], |
|
855 [0, aY, 0], |
|
856 [0, 0, 1] |
|
857 ]; |
|
858 |
|
859 setM(this, matrixMultiply(m1, this.m_), true); |
|
860 }; |
|
861 |
|
862 contextPrototype.transform = function(m11, m12, m21, m22, dx, dy) { |
|
863 var m1 = [ |
|
864 [m11, m12, 0], |
|
865 [m21, m22, 0], |
|
866 [dx, dy, 1] |
|
867 ]; |
|
868 |
|
869 setM(this, matrixMultiply(m1, this.m_), true); |
|
870 }; |
|
871 |
|
872 contextPrototype.setTransform = function(m11, m12, m21, m22, dx, dy) { |
|
873 var m = [ |
|
874 [m11, m12, 0], |
|
875 [m21, m22, 0], |
|
876 [dx, dy, 1] |
|
877 ]; |
|
878 |
|
879 setM(this, m, true); |
|
880 }; |
|
881 |
|
882 /******** STUBS ********/ |
|
883 contextPrototype.clip = function() { |
|
884 // TODO: Implement |
|
885 }; |
|
886 |
|
887 contextPrototype.arcTo = function() { |
|
888 // TODO: Implement |
|
889 }; |
|
890 |
|
891 contextPrototype.createPattern = function() { |
|
892 return new CanvasPattern_; |
|
893 }; |
|
894 |
|
895 // Gradient / Pattern Stubs |
|
896 function CanvasGradient_(aType) { |
|
897 this.type_ = aType; |
|
898 this.x0_ = 0; |
|
899 this.y0_ = 0; |
|
900 this.r0_ = 0; |
|
901 this.x1_ = 0; |
|
902 this.y1_ = 0; |
|
903 this.r1_ = 0; |
|
904 this.colors_ = []; |
|
905 } |
|
906 |
|
907 CanvasGradient_.prototype.addColorStop = function(aOffset, aColor) { |
|
908 aColor = processStyle(aColor); |
|
909 this.colors_.push({offset: aOffset, |
|
910 color: aColor.color, |
|
911 alpha: aColor.alpha}); |
|
912 }; |
|
913 |
|
914 function CanvasPattern_() {} |
|
915 |
|
916 // set up externs |
|
917 G_vmlCanvasManager = G_vmlCanvasManager_; |
|
918 CanvasRenderingContext2D = CanvasRenderingContext2D_; |
|
919 CanvasGradient = CanvasGradient_; |
|
920 CanvasPattern = CanvasPattern_; |
|
921 |
|
922 })(); |
|
923 |
|
924 } // if |
|