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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);
|
|
|
406 var pStart = this.getCoords_(xStart, yStart);
|
|
|
407 var pEnd = this.getCoords_(xEnd, yEnd);
|
|
|
408
|
|
|
409 this.currentPath_.push({type: arcType,
|
|
|
410 x: p.x,
|
|
|
411 y: p.y,
|
|
|
412 radius: aRadius,
|
|
|
413 xStart: pStart.x,
|
|
|
414 yStart: pStart.y,
|
|
|
415 xEnd: pEnd.x,
|
|
|
416 yEnd: pEnd.y});
|
|
|
417
|
|
|
418 };
|
|
|
419
|
|
|
420 contextPrototype.rect = function(aX, aY, aWidth, aHeight) {
|
|
|
421 this.moveTo(aX, aY);
|
|
|
422 this.lineTo(aX + aWidth, aY);
|
|
|
423 this.lineTo(aX + aWidth, aY + aHeight);
|
|
|
424 this.lineTo(aX, aY + aHeight);
|
|
|
425 this.closePath();
|
|
|
426 };
|
|
|
427
|
|
|
428 contextPrototype.strokeRect = function(aX, aY, aWidth, aHeight) {
|
|
|
429 var oldPath = this.currentPath_;
|
|
|
430 this.beginPath();
|
|
|
431
|
|
|
432 this.moveTo(aX, aY);
|
|
|
433 this.lineTo(aX + aWidth, aY);
|
|
|
434 this.lineTo(aX + aWidth, aY + aHeight);
|
|
|
435 this.lineTo(aX, aY + aHeight);
|
|
|
436 this.closePath();
|
|
|
437 this.stroke();
|
|
|
438
|
|
|
439 this.currentPath_ = oldPath;
|
|
|
440 };
|
|
|
441
|
|
|
442 contextPrototype.fillRect = function(aX, aY, aWidth, aHeight) {
|
|
|
443 var oldPath = this.currentPath_;
|
|
|
444 this.beginPath();
|
|
|
445
|
|
|
446 this.moveTo(aX, aY);
|
|
|
447 this.lineTo(aX + aWidth, aY);
|
|
|
448 this.lineTo(aX + aWidth, aY + aHeight);
|
|
|
449 this.lineTo(aX, aY + aHeight);
|
|
|
450 this.closePath();
|
|
|
451 this.fill();
|
|
|
452
|
|
|
453 this.currentPath_ = oldPath;
|
|
|
454 };
|
|
|
455
|
|
|
456 contextPrototype.createLinearGradient = function(aX0, aY0, aX1, aY1) {
|
|
|
457 var gradient = new CanvasGradient_('gradient');
|
|
|
458 gradient.x0_ = aX0;
|
|
|
459 gradient.y0_ = aY0;
|
|
|
460 gradient.x1_ = aX1;
|
|
|
461 gradient.y1_ = aY1;
|
|
|
462 return gradient;
|
|
|
463 };
|
|
|
464
|
|
|
465 contextPrototype.createRadialGradient = function(aX0, aY0, aR0,
|
|
|
466 aX1, aY1, aR1) {
|
|
|
467 var gradient = new CanvasGradient_('gradientradial');
|
|
|
468 gradient.x0_ = aX0;
|
|
|
469 gradient.y0_ = aY0;
|
|
|
470 gradient.r0_ = aR0;
|
|
|
471 gradient.x1_ = aX1;
|
|
|
472 gradient.y1_ = aY1;
|
|
|
473 gradient.r1_ = aR1;
|
|
|
474 return gradient;
|
|
|
475 };
|
|
|
476
|
|
|
477 contextPrototype.drawImage = function(image, var_args) {
|
|
|
478 var dx, dy, dw, dh, sx, sy, sw, sh;
|
|
|
479
|
|
|
480 // to find the original width we overide the width and height
|
|
|
481 var oldRuntimeWidth = image.runtimeStyle.width;
|
|
|
482 var oldRuntimeHeight = image.runtimeStyle.height;
|
|
|
483 image.runtimeStyle.width = 'auto';
|
|
|
484 image.runtimeStyle.height = 'auto';
|
|
|
485
|
|
|
486 // get the original size
|
|
|
487 var w = image.width;
|
|
|
488 var h = image.height;
|
|
|
489
|
|
|
490 // and remove overides
|
|
|
491 image.runtimeStyle.width = oldRuntimeWidth;
|
|
|
492 image.runtimeStyle.height = oldRuntimeHeight;
|
|
|
493
|
|
|
494 if (arguments.length == 3) {
|
|
|
495 dx = arguments[1];
|
|
|
496 dy = arguments[2];
|
|
|
497 sx = sy = 0;
|
|
|
498 sw = dw = w;
|
|
|
499 sh = dh = h;
|
|
|
500 } else if (arguments.length == 5) {
|
|
|
501 dx = arguments[1];
|
|
|
502 dy = arguments[2];
|
|
|
503 dw = arguments[3];
|
|
|
504 dh = arguments[4];
|
|
|
505 sx = sy = 0;
|
|
|
506 sw = w;
|
|
|
507 sh = h;
|
|
|
508 } else if (arguments.length == 9) {
|
|
|
509 sx = arguments[1];
|
|
|
510 sy = arguments[2];
|
|
|
511 sw = arguments[3];
|
|
|
512 sh = arguments[4];
|
|
|
513 dx = arguments[5];
|
|
|
514 dy = arguments[6];
|
|
|
515 dw = arguments[7];
|
|
|
516 dh = arguments[8];
|
|
|
517 } else {
|
|
|
518 throw Error('Invalid number of arguments');
|
|
|
519 }
|
|
|
520
|
|
|
521 var d = this.getCoords_(dx, dy);
|
|
|
522
|
|
|
523 var w2 = sw / 2;
|
|
|
524 var h2 = sh / 2;
|
|
|
525
|
|
|
526 var vmlStr = [];
|
|
|
527
|
|
|
528 var W = 10;
|
|
|
529 var H = 10;
|
|
|
530
|
|
|
531 // For some reason that I've now forgotten, using divs didn't work
|
|
|
532 vmlStr.push(' <g_vml_:group',
|
|
|
533 ' coordsize="', Z * W, ',', Z * H, '"',
|
|
|
534 ' coordorigin="0,0"' ,
|
|
|
535 ' style="width:', W, 'px;height:', H, 'px;position:absolute;');
|
|
|
536
|
|
|
537 // If filters are necessary (rotation exists), create them
|
|
|
538 // filters are bog-slow, so only create them if abbsolutely necessary
|
|
|
539 // The following check doesn't account for skews (which don't exist
|
|
|
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;
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|
|
809 }
|
|
|
810
|
|
|
811 function setM(ctx, m, updateLineScale) {
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|
|
812 if (!matrixIsFinite(m)) {
|
|
|
813 return;
|
|
|
814 }
|
|
|
815 ctx.m_ = m;
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|
|
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
|
