root / hci / trunk / eneraptor-web-app / web-app / js / flot / excanvas.js @ 70
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1 | 11 | alexbesir | // 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 | |||
15 | |||
16 | // Known Issues:
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17 | //
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18 | // * Patterns only support repeat.
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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 | // * Filling very large shapes (above 5000 points) is buggy.
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33 | // * Optimize. There is always room for speed improvements.
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34 | |||
35 | // Only add this code if we do not already have a canvas implementation
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36 | if (!document.createElement('canvas').getContext) { |
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37 | |||
38 | (function() {
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39 | |||
40 | // alias some functions to make (compiled) code shorter
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41 | var m = Math;
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42 | var mr = m.round;
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43 | var ms = m.sin;
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44 | var mc = m.cos;
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45 | var abs = m.abs;
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46 | var sqrt = m.sqrt;
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47 | |||
48 | // this is used for sub pixel precision
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49 | var Z = 10; |
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50 | var Z2 = Z / 2; |
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51 | |||
52 | /**
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53 | * This funtion is assigned to the <canvas> elements as element.getContext().
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54 | * @this {HTMLElement}
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55 | * @return {CanvasRenderingContext2D_}
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56 | */
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57 | function getContext() { |
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58 | return this.context_ || |
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59 | (this.context_ = new CanvasRenderingContext2D_(this)); |
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60 | } |
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61 | |||
62 | var slice = Array.prototype.slice;
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63 | |||
64 | /**
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65 | * Binds a function to an object. The returned function will always use the
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66 | * passed in {@code obj} as {@code this}.
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67 | *
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68 | * Example:
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69 | *
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70 | * g = bind(f, obj, a, b)
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71 | * g(c, d) // will do f.call(obj, a, b, c, d)
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72 | *
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73 | * @param {Function} f The function to bind the object to
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74 | * @param {Object} obj The object that should act as this when the function
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75 | * is called
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76 | * @param {*} var_args Rest arguments that will be used as the initial
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77 | * arguments when the function is called
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78 | * @return {Function} A new function that has bound this
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79 | */
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80 | function bind(f, obj, var_args) { |
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81 | var a = slice.call(arguments, 2); |
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82 | return function() { |
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83 | return f.apply(obj, a.concat(slice.call(arguments))); |
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84 | }; |
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85 | } |
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86 | |||
87 | function encodeHtmlAttribute(s) { |
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88 | return String(s).replace(/&/g, '&').replace(/"/g, '"'); |
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89 | } |
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90 | |||
91 | function addNamespacesAndStylesheet(doc) { |
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92 | // create xmlns
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93 | if (!doc.namespaces['g_vml_']) { |
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94 | doc.namespaces.add('g_vml_', 'urn:schemas-microsoft-com:vml', |
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95 | '#default#VML');
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96 | |||
97 | } |
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98 | if (!doc.namespaces['g_o_']) { |
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99 | doc.namespaces.add('g_o_', 'urn:schemas-microsoft-com:office:office', |
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100 | '#default#VML');
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101 | } |
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102 | |||
103 | // Setup default CSS. Only add one style sheet per document
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104 | if (!doc.styleSheets['ex_canvas_']) { |
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105 | var ss = doc.createStyleSheet();
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106 | ss.owningElement.id = 'ex_canvas_';
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107 | ss.cssText = 'canvas{display:inline-block;overflow:hidden;' +
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108 | // default size is 300x150 in Gecko and Opera
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109 | 'text-align:left;width:300px;height:150px}';
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110 | } |
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111 | } |
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112 | |||
113 | // Add namespaces and stylesheet at startup.
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114 | addNamespacesAndStylesheet(document); |
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115 | |||
116 | var G_vmlCanvasManager_ = {
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117 | init: function(opt_doc) { |
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118 | if (/MSIE/.test(navigator.userAgent) && !window.opera) { |
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119 | var doc = opt_doc || document;
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120 | // Create a dummy element so that IE will allow canvas elements to be
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121 | // recognized.
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122 | doc.createElement('canvas');
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123 | doc.attachEvent('onreadystatechange', bind(this.init_, this, doc)); |
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124 | } |
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125 | }, |
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126 | |||
127 | init_: function(doc) { |
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128 | // find all canvas elements
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129 | var els = doc.getElementsByTagName('canvas'); |
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130 | for (var i = 0; i < els.length; i++) { |
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131 | this.initElement(els[i]);
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132 | } |
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133 | }, |
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134 | |||
135 | /**
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136 | * Public initializes a canvas element so that it can be used as canvas
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137 | * element from now on. This is called automatically before the page is
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138 | * loaded but if you are creating elements using createElement you need to
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139 | * make sure this is called on the element.
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140 | * @param {HTMLElement} el The canvas element to initialize.
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141 | * @return {HTMLElement} the element that was created.
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142 | */
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143 | initElement: function(el) { |
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144 | if (!el.getContext) {
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145 | el.getContext = getContext; |
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146 | |||
147 | // Add namespaces and stylesheet to document of the element.
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148 | addNamespacesAndStylesheet(el.ownerDocument); |
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149 | |||
150 | // Remove fallback content. There is no way to hide text nodes so we
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151 | // just remove all childNodes. We could hide all elements and remove
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152 | // text nodes but who really cares about the fallback content.
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153 | el.innerHTML = '';
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154 | |||
155 | // do not use inline function because that will leak memory
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156 | el.attachEvent('onpropertychange', onPropertyChange);
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157 | el.attachEvent('onresize', onResize);
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158 | |||
159 | var attrs = el.attributes;
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160 | if (attrs.width && attrs.width.specified) {
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161 | // TODO: use runtimeStyle and coordsize
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162 | // el.getContext().setWidth_(attrs.width.nodeValue);
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163 | el.style.width = attrs.width.nodeValue + 'px';
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164 | } else {
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165 | el.width = el.clientWidth; |
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166 | } |
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167 | if (attrs.height && attrs.height.specified) {
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168 | // TODO: use runtimeStyle and coordsize
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169 | // el.getContext().setHeight_(attrs.height.nodeValue);
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170 | el.style.height = attrs.height.nodeValue + 'px';
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171 | } else {
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172 | el.height = el.clientHeight; |
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173 | } |
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174 | //el.getContext().setCoordsize_()
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175 | } |
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176 | return el;
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177 | } |
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178 | }; |
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179 | |||
180 | function onPropertyChange(e) { |
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181 | var el = e.srcElement;
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182 | |||
183 | switch (e.propertyName) {
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184 | case 'width': |
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185 | el.getContext().clearRect(); |
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186 | el.style.width = el.attributes.width.nodeValue + 'px';
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187 | // In IE8 this does not trigger onresize.
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188 | el.firstChild.style.width = el.clientWidth + 'px';
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189 | break;
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190 | case 'height': |
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191 | el.getContext().clearRect(); |
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192 | el.style.height = el.attributes.height.nodeValue + 'px';
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193 | el.firstChild.style.height = el.clientHeight + 'px';
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194 | break;
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195 | } |
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196 | } |
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197 | |||
198 | function onResize(e) { |
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199 | var el = e.srcElement;
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200 | if (el.firstChild) {
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201 | el.firstChild.style.width = el.clientWidth + 'px';
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202 | el.firstChild.style.height = el.clientHeight + 'px';
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203 | } |
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204 | } |
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205 | |||
206 | G_vmlCanvasManager_.init(); |
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207 | |||
208 | // precompute "00" to "FF"
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209 | var decToHex = [];
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210 | for (var i = 0; i < 16; i++) { |
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211 | for (var j = 0; j < 16; j++) { |
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212 | decToHex[i * 16 + j] = i.toString(16) + j.toString(16); |
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213 | } |
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214 | } |
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215 | |||
216 | function createMatrixIdentity() { |
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217 | return [
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218 | [1, 0, 0], |
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219 | [0, 1, 0], |
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220 | [0, 0, 1] |
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221 | ]; |
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222 | } |
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223 | |||
224 | function matrixMultiply(m1, m2) { |
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225 | var result = createMatrixIdentity();
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226 | |||
227 | for (var x = 0; x < 3; x++) { |
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228 | for (var y = 0; y < 3; y++) { |
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229 | var sum = 0; |
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230 | |||
231 | for (var z = 0; z < 3; z++) { |
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232 | sum += m1[x][z] * m2[z][y]; |
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233 | } |
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234 | |||
235 | result[x][y] = sum; |
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236 | } |
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237 | } |
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238 | return result;
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239 | } |
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240 | |||
241 | function copyState(o1, o2) { |
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242 | o2.fillStyle = o1.fillStyle; |
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243 | o2.lineCap = o1.lineCap; |
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244 | o2.lineJoin = o1.lineJoin; |
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245 | o2.lineWidth = o1.lineWidth; |
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246 | o2.miterLimit = o1.miterLimit; |
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247 | o2.shadowBlur = o1.shadowBlur; |
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248 | o2.shadowColor = o1.shadowColor; |
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249 | o2.shadowOffsetX = o1.shadowOffsetX; |
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250 | o2.shadowOffsetY = o1.shadowOffsetY; |
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251 | o2.strokeStyle = o1.strokeStyle; |
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252 | o2.globalAlpha = o1.globalAlpha; |
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253 | o2.font = o1.font; |
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254 | o2.textAlign = o1.textAlign; |
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255 | o2.textBaseline = o1.textBaseline; |
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256 | o2.arcScaleX_ = o1.arcScaleX_; |
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257 | o2.arcScaleY_ = o1.arcScaleY_; |
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258 | o2.lineScale_ = o1.lineScale_; |
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259 | } |
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260 | |||
261 | var colorData = {
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262 | aliceblue: '#F0F8FF', |
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263 | antiquewhite: '#FAEBD7', |
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264 | aquamarine: '#7FFFD4', |
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265 | azure: '#F0FFFF', |
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266 | beige: '#F5F5DC', |
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267 | bisque: '#FFE4C4', |
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268 | black: '#000000', |
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269 | blanchedalmond: '#FFEBCD', |
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270 | blueviolet: '#8A2BE2', |
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271 | brown: '#A52A2A', |
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272 | burlywood: '#DEB887', |
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273 | cadetblue: '#5F9EA0', |
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274 | chartreuse: '#7FFF00', |
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275 | chocolate: '#D2691E', |
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276 | coral: '#FF7F50', |
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277 | cornflowerblue: '#6495ED', |
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278 | cornsilk: '#FFF8DC', |
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279 | crimson: '#DC143C', |
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280 | cyan: '#00FFFF', |
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281 | darkblue: '#00008B', |
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282 | darkcyan: '#008B8B', |
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283 | darkgoldenrod: '#B8860B', |
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284 | darkgray: '#A9A9A9', |
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285 | darkgreen: '#006400', |
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286 | darkgrey: '#A9A9A9', |
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287 | darkkhaki: '#BDB76B', |
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288 | darkmagenta: '#8B008B', |
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289 | darkolivegreen: '#556B2F', |
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290 | darkorange: '#FF8C00', |
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291 | darkorchid: '#9932CC', |
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292 | darkred: '#8B0000', |
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293 | darksalmon: '#E9967A', |
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294 | darkseagreen: '#8FBC8F', |
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295 | darkslateblue: '#483D8B', |
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296 | darkslategray: '#2F4F4F', |
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297 | darkslategrey: '#2F4F4F', |
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298 | darkturquoise: '#00CED1', |
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299 | darkviolet: '#9400D3', |
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300 | deeppink: '#FF1493', |
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301 | deepskyblue: '#00BFFF', |
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302 | dimgray: '#696969', |
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303 | dimgrey: '#696969', |
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304 | dodgerblue: '#1E90FF', |
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305 | firebrick: '#B22222', |
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306 | floralwhite: '#FFFAF0', |
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307 | forestgreen: '#228B22', |
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308 | gainsboro: '#DCDCDC', |
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309 | ghostwhite: '#F8F8FF', |
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310 | gold: '#FFD700', |
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311 | goldenrod: '#DAA520', |
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312 | grey: '#808080', |
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313 | greenyellow: '#ADFF2F', |
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314 | honeydew: '#F0FFF0', |
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315 | hotpink: '#FF69B4', |
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316 | indianred: '#CD5C5C', |
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317 | indigo: '#4B0082', |
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318 | ivory: '#FFFFF0', |
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319 | khaki: '#F0E68C', |
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320 | lavender: '#E6E6FA', |
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321 | lavenderblush: '#FFF0F5', |
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322 | lawngreen: '#7CFC00', |
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323 | lemonchiffon: '#FFFACD', |
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324 | lightblue: '#ADD8E6', |
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325 | lightcoral: '#F08080', |
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326 | lightcyan: '#E0FFFF', |
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327 | lightgoldenrodyellow: '#FAFAD2', |
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328 | lightgreen: '#90EE90', |
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329 | lightgrey: '#D3D3D3', |
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330 | lightpink: '#FFB6C1', |
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331 | lightsalmon: '#FFA07A', |
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332 | lightseagreen: '#20B2AA', |
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333 | lightskyblue: '#87CEFA', |
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334 | lightslategray: '#778899', |
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335 | lightslategrey: '#778899', |
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336 | lightsteelblue: '#B0C4DE', |
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337 | lightyellow: '#FFFFE0', |
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338 | limegreen: '#32CD32', |
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339 | linen: '#FAF0E6', |
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340 | magenta: '#FF00FF', |
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341 | mediumaquamarine: '#66CDAA', |
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342 | mediumblue: '#0000CD', |
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343 | mediumorchid: '#BA55D3', |
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344 | mediumpurple: '#9370DB', |
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345 | mediumseagreen: '#3CB371', |
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346 | mediumslateblue: '#7B68EE', |
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347 | mediumspringgreen: '#00FA9A', |
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348 | mediumturquoise: '#48D1CC', |
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349 | mediumvioletred: '#C71585', |
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350 | midnightblue: '#191970', |
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351 | mintcream: '#F5FFFA', |
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352 | mistyrose: '#FFE4E1', |
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353 | moccasin: '#FFE4B5', |
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354 | navajowhite: '#FFDEAD', |
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355 | oldlace: '#FDF5E6', |
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356 | olivedrab: '#6B8E23', |
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357 | orange: '#FFA500', |
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358 | orangered: '#FF4500', |
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359 | orchid: '#DA70D6', |
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360 | palegoldenrod: '#EEE8AA', |
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361 | palegreen: '#98FB98', |
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362 | paleturquoise: '#AFEEEE', |
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363 | palevioletred: '#DB7093', |
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364 | papayawhip: '#FFEFD5', |
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365 | peachpuff: '#FFDAB9', |
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366 | peru: '#CD853F', |
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367 | pink: '#FFC0CB', |
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368 | plum: '#DDA0DD', |
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369 | powderblue: '#B0E0E6', |
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370 | rosybrown: '#BC8F8F', |
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371 | royalblue: '#4169E1', |
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372 | saddlebrown: '#8B4513', |
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373 | salmon: '#FA8072', |
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374 | sandybrown: '#F4A460', |
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375 | seagreen: '#2E8B57', |
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376 | seashell: '#FFF5EE', |
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377 | sienna: '#A0522D', |
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378 | skyblue: '#87CEEB', |
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379 | slateblue: '#6A5ACD', |
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380 | slategray: '#708090', |
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381 | slategrey: '#708090', |
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382 | snow: '#FFFAFA', |
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383 | springgreen: '#00FF7F', |
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384 | steelblue: '#4682B4', |
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385 | tan: '#D2B48C', |
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386 | thistle: '#D8BFD8', |
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387 | tomato: '#FF6347', |
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388 | turquoise: '#40E0D0', |
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389 | violet: '#EE82EE', |
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390 | wheat: '#F5DEB3', |
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391 | whitesmoke: '#F5F5F5', |
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392 | yellowgreen: '#9ACD32' |
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393 | }; |
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394 | |||
395 | |||
396 | function getRgbHslContent(styleString) { |
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397 | var start = styleString.indexOf('(', 3); |
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398 | var end = styleString.indexOf(')', start + 1); |
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399 | var parts = styleString.substring(start + 1, end).split(','); |
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400 | // add alpha if needed
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401 | if (parts.length == 4 && styleString.substr(3, 1) == 'a') { |
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402 | alpha = Number(parts[3]);
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403 | } else {
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404 | parts[3] = 1; |
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405 | } |
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406 | return parts;
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407 | } |
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408 | |||
409 | function percent(s) { |
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410 | return parseFloat(s) / 100; |
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411 | } |
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412 | |||
413 | function clamp(v, min, max) { |
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414 | return Math.min(max, Math.max(min, v));
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415 | } |
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416 | |||
417 | function hslToRgb(parts){ |
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418 | var r, g, b;
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419 | h = parseFloat(parts[0]) / 360 % 360; |
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420 | if (h < 0) |
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421 | h++; |
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422 | s = clamp(percent(parts[1]), 0, 1); |
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423 | l = clamp(percent(parts[2]), 0, 1); |
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424 | if (s == 0) { |
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425 | r = g = b = l; // achromatic
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426 | } else {
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427 | var q = l < 0.5 ? l * (1 + s) : l + s - l * s; |
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428 | var p = 2 * l - q; |
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429 | r = hueToRgb(p, q, h + 1 / 3); |
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430 | g = hueToRgb(p, q, h); |
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431 | b = hueToRgb(p, q, h - 1 / 3); |
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432 | } |
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433 | |||
434 | return '#' + decToHex[Math.floor(r * 255)] + |
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435 | decToHex[Math.floor(g * 255)] +
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436 | decToHex[Math.floor(b * 255)];
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437 | } |
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438 | |||
439 | function hueToRgb(m1, m2, h) { |
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440 | if (h < 0) |
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441 | h++; |
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442 | if (h > 1) |
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443 | h--; |
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444 | |||
445 | if (6 * h < 1) |
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446 | return m1 + (m2 - m1) * 6 * h; |
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447 | else if (2 * h < 1) |
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448 | return m2;
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449 | else if (3 * h < 2) |
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450 | return m1 + (m2 - m1) * (2 / 3 - h) * 6; |
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451 | else
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452 | return m1;
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453 | } |
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454 | |||
455 | function processStyle(styleString) { |
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456 | var str, alpha = 1; |
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457 | |||
458 | styleString = String(styleString); |
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459 | if (styleString.charAt(0) == '#') { |
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460 | str = styleString; |
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461 | } else if (/^rgb/.test(styleString)) { |
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462 | var parts = getRgbHslContent(styleString);
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463 | var str = '#', n; |
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464 | for (var i = 0; i < 3; i++) { |
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465 | if (parts[i].indexOf('%') != -1) { |
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466 | n = Math.floor(percent(parts[i]) * 255);
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467 | } else {
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468 | n = Number(parts[i]); |
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469 | } |
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470 | str += decToHex[clamp(n, 0, 255)]; |
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471 | } |
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472 | alpha = parts[3];
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473 | } else if (/^hsl/.test(styleString)) { |
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474 | var parts = getRgbHslContent(styleString);
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475 | str = hslToRgb(parts); |
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476 | alpha = parts[3];
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477 | } else {
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478 | str = colorData[styleString] || styleString; |
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479 | } |
||
480 | return {color: str, alpha: alpha}; |
||
481 | } |
||
482 | |||
483 | var DEFAULT_STYLE = {
|
||
484 | style: 'normal', |
||
485 | variant: 'normal', |
||
486 | weight: 'normal', |
||
487 | size: 10, |
||
488 | family: 'sans-serif' |
||
489 | }; |
||
490 | |||
491 | // Internal text style cache
|
||
492 | var fontStyleCache = {};
|
||
493 | |||
494 | function processFontStyle(styleString) { |
||
495 | if (fontStyleCache[styleString]) {
|
||
496 | return fontStyleCache[styleString];
|
||
497 | } |
||
498 | |||
499 | var el = document.createElement('div'); |
||
500 | var style = el.style;
|
||
501 | try {
|
||
502 | style.font = styleString; |
||
503 | } catch (ex) {
|
||
504 | // Ignore failures to set to invalid font.
|
||
505 | } |
||
506 | |||
507 | return fontStyleCache[styleString] = {
|
||
508 | style: style.fontStyle || DEFAULT_STYLE.style,
|
||
509 | variant: style.fontVariant || DEFAULT_STYLE.variant,
|
||
510 | weight: style.fontWeight || DEFAULT_STYLE.weight,
|
||
511 | size: style.fontSize || DEFAULT_STYLE.size,
|
||
512 | family: style.fontFamily || DEFAULT_STYLE.family
|
||
513 | }; |
||
514 | } |
||
515 | |||
516 | function getComputedStyle(style, element) { |
||
517 | var computedStyle = {};
|
||
518 | |||
519 | for (var p in style) { |
||
520 | computedStyle[p] = style[p]; |
||
521 | } |
||
522 | |||
523 | // Compute the size
|
||
524 | var canvasFontSize = parseFloat(element.currentStyle.fontSize),
|
||
525 | fontSize = parseFloat(style.size); |
||
526 | |||
527 | if (typeof style.size == 'number') { |
||
528 | computedStyle.size = style.size; |
||
529 | } else if (style.size.indexOf('px') != -1) { |
||
530 | computedStyle.size = fontSize; |
||
531 | } else if (style.size.indexOf('em') != -1) { |
||
532 | computedStyle.size = canvasFontSize * fontSize; |
||
533 | } else if(style.size.indexOf('%') != -1) { |
||
534 | computedStyle.size = (canvasFontSize / 100) * fontSize;
|
||
535 | } else if (style.size.indexOf('pt') != -1) { |
||
536 | computedStyle.size = fontSize / .75;
|
||
537 | } else {
|
||
538 | computedStyle.size = canvasFontSize; |
||
539 | } |
||
540 | |||
541 | // Different scaling between normal text and VML text. This was found using
|
||
542 | // trial and error to get the same size as non VML text.
|
||
543 | computedStyle.size *= 0.981;
|
||
544 | |||
545 | return computedStyle;
|
||
546 | } |
||
547 | |||
548 | function buildStyle(style) { |
||
549 | return style.style + ' ' + style.variant + ' ' + style.weight + ' ' + |
||
550 | style.size + 'px ' + style.family;
|
||
551 | } |
||
552 | |||
553 | function processLineCap(lineCap) { |
||
554 | switch (lineCap) {
|
||
555 | case 'butt': |
||
556 | return 'flat'; |
||
557 | case 'round': |
||
558 | return 'round'; |
||
559 | case 'square': |
||
560 | default:
|
||
561 | return 'square'; |
||
562 | } |
||
563 | } |
||
564 | |||
565 | /**
|
||
566 | * This class implements CanvasRenderingContext2D interface as described by
|
||
567 | * the WHATWG.
|
||
568 | * @param {HTMLElement} surfaceElement The element that the 2D context should
|
||
569 | * be associated with
|
||
570 | */
|
||
571 | function CanvasRenderingContext2D_(surfaceElement) { |
||
572 | this.m_ = createMatrixIdentity();
|
||
573 | |||
574 | this.mStack_ = [];
|
||
575 | this.aStack_ = [];
|
||
576 | this.currentPath_ = [];
|
||
577 | |||
578 | // Canvas context properties
|
||
579 | this.strokeStyle = '#000'; |
||
580 | this.fillStyle = '#000'; |
||
581 | |||
582 | this.lineWidth = 1; |
||
583 | this.lineJoin = 'miter'; |
||
584 | this.lineCap = 'butt'; |
||
585 | this.miterLimit = Z * 1; |
||
586 | this.globalAlpha = 1; |
||
587 | this.font = '10px sans-serif'; |
||
588 | this.textAlign = 'left'; |
||
589 | this.textBaseline = 'alphabetic'; |
||
590 | this.canvas = surfaceElement;
|
||
591 | |||
592 | var el = surfaceElement.ownerDocument.createElement('div'); |
||
593 | el.style.width = surfaceElement.clientWidth + 'px';
|
||
594 | el.style.height = surfaceElement.clientHeight + 'px';
|
||
595 | el.style.overflow = 'hidden';
|
||
596 | el.style.position = 'absolute';
|
||
597 | surfaceElement.appendChild(el); |
||
598 | |||
599 | this.element_ = el;
|
||
600 | this.arcScaleX_ = 1; |
||
601 | this.arcScaleY_ = 1; |
||
602 | this.lineScale_ = 1; |
||
603 | } |
||
604 | |||
605 | var contextPrototype = CanvasRenderingContext2D_.prototype;
|
||
606 | contextPrototype.clearRect = function() { |
||
607 | if (this.textMeasureEl_) { |
||
608 | this.textMeasureEl_.removeNode(true); |
||
609 | this.textMeasureEl_ = null; |
||
610 | } |
||
611 | this.element_.innerHTML = ''; |
||
612 | }; |
||
613 | |||
614 | contextPrototype.beginPath = function() { |
||
615 | // TODO: Branch current matrix so that save/restore has no effect
|
||
616 | // as per safari docs.
|
||
617 | this.currentPath_ = [];
|
||
618 | }; |
||
619 | |||
620 | contextPrototype.moveTo = function(aX, aY) { |
||
621 | var p = this.getCoords_(aX, aY); |
||
622 | this.currentPath_.push({type: 'moveTo', x: p.x, y: p.y}); |
||
623 | this.currentX_ = p.x;
|
||
624 | this.currentY_ = p.y;
|
||
625 | }; |
||
626 | |||
627 | contextPrototype.lineTo = function(aX, aY) { |
||
628 | var p = this.getCoords_(aX, aY); |
||
629 | this.currentPath_.push({type: 'lineTo', x: p.x, y: p.y}); |
||
630 | |||
631 | this.currentX_ = p.x;
|
||
632 | this.currentY_ = p.y;
|
||
633 | }; |
||
634 | |||
635 | contextPrototype.bezierCurveTo = function(aCP1x, aCP1y, |
||
636 | aCP2x, aCP2y, |
||
637 | aX, aY) { |
||
638 | var p = this.getCoords_(aX, aY); |
||
639 | var cp1 = this.getCoords_(aCP1x, aCP1y); |
||
640 | var cp2 = this.getCoords_(aCP2x, aCP2y); |
||
641 | bezierCurveTo(this, cp1, cp2, p);
|
||
642 | }; |
||
643 | |||
644 | // Helper function that takes the already fixed cordinates.
|
||
645 | function bezierCurveTo(self, cp1, cp2, p) { |
||
646 | self.currentPath_.push({ |
||
647 | type: 'bezierCurveTo', |
||
648 | cp1x: cp1.x,
|
||
649 | cp1y: cp1.y,
|
||
650 | cp2x: cp2.x,
|
||
651 | cp2y: cp2.y,
|
||
652 | x: p.x,
|
||
653 | y: p.y
|
||
654 | }); |
||
655 | self.currentX_ = p.x; |
||
656 | self.currentY_ = p.y; |
||
657 | } |
||
658 | |||
659 | contextPrototype.quadraticCurveTo = function(aCPx, aCPy, aX, aY) { |
||
660 | // the following is lifted almost directly from
|
||
661 | // http://developer.mozilla.org/en/docs/Canvas_tutorial:Drawing_shapes
|
||
662 | |||
663 | var cp = this.getCoords_(aCPx, aCPy); |
||
664 | var p = this.getCoords_(aX, aY); |
||
665 | |||
666 | var cp1 = {
|
||
667 | x: this.currentX_ + 2.0 / 3.0 * (cp.x - this.currentX_), |
||
668 | y: this.currentY_ + 2.0 / 3.0 * (cp.y - this.currentY_) |
||
669 | }; |
||
670 | var cp2 = {
|
||
671 | x: cp1.x + (p.x - this.currentX_) / 3.0, |
||
672 | y: cp1.y + (p.y - this.currentY_) / 3.0 |
||
673 | }; |
||
674 | |||
675 | bezierCurveTo(this, cp1, cp2, p);
|
||
676 | }; |
||
677 | |||
678 | contextPrototype.arc = function(aX, aY, aRadius, |
||
679 | aStartAngle, aEndAngle, aClockwise) { |
||
680 | aRadius *= Z; |
||
681 | var arcType = aClockwise ? 'at' : 'wa'; |
||
682 | |||
683 | var xStart = aX + mc(aStartAngle) * aRadius - Z2;
|
||
684 | var yStart = aY + ms(aStartAngle) * aRadius - Z2;
|
||
685 | |||
686 | var xEnd = aX + mc(aEndAngle) * aRadius - Z2;
|
||
687 | var yEnd = aY + ms(aEndAngle) * aRadius - Z2;
|
||
688 | |||
689 | // IE won't render arches drawn counter clockwise if xStart == xEnd.
|
||
690 | if (xStart == xEnd && !aClockwise) {
|
||
691 | xStart += 0.125; // Offset xStart by 1/80 of a pixel. Use something |
||
692 | // that can be represented in binary
|
||
693 | } |
||
694 | |||
695 | var p = this.getCoords_(aX, aY); |
||
696 | var pStart = this.getCoords_(xStart, yStart); |
||
697 | var pEnd = this.getCoords_(xEnd, yEnd); |
||
698 | |||
699 | this.currentPath_.push({type: arcType, |
||
700 | x: p.x,
|
||
701 | y: p.y,
|
||
702 | radius: aRadius,
|
||
703 | xStart: pStart.x,
|
||
704 | yStart: pStart.y,
|
||
705 | xEnd: pEnd.x,
|
||
706 | yEnd: pEnd.y});
|
||
707 | |||
708 | }; |
||
709 | |||
710 | contextPrototype.rect = function(aX, aY, aWidth, aHeight) { |
||
711 | this.moveTo(aX, aY);
|
||
712 | this.lineTo(aX + aWidth, aY);
|
||
713 | this.lineTo(aX + aWidth, aY + aHeight);
|
||
714 | this.lineTo(aX, aY + aHeight);
|
||
715 | this.closePath();
|
||
716 | }; |
||
717 | |||
718 | contextPrototype.strokeRect = function(aX, aY, aWidth, aHeight) { |
||
719 | var oldPath = this.currentPath_; |
||
720 | this.beginPath();
|
||
721 | |||
722 | this.moveTo(aX, aY);
|
||
723 | this.lineTo(aX + aWidth, aY);
|
||
724 | this.lineTo(aX + aWidth, aY + aHeight);
|
||
725 | this.lineTo(aX, aY + aHeight);
|
||
726 | this.closePath();
|
||
727 | this.stroke();
|
||
728 | |||
729 | this.currentPath_ = oldPath;
|
||
730 | }; |
||
731 | |||
732 | contextPrototype.fillRect = function(aX, aY, aWidth, aHeight) { |
||
733 | var oldPath = this.currentPath_; |
||
734 | this.beginPath();
|
||
735 | |||
736 | this.moveTo(aX, aY);
|
||
737 | this.lineTo(aX + aWidth, aY);
|
||
738 | this.lineTo(aX + aWidth, aY + aHeight);
|
||
739 | this.lineTo(aX, aY + aHeight);
|
||
740 | this.closePath();
|
||
741 | this.fill();
|
||
742 | |||
743 | this.currentPath_ = oldPath;
|
||
744 | }; |
||
745 | |||
746 | contextPrototype.createLinearGradient = function(aX0, aY0, aX1, aY1) { |
||
747 | var gradient = new CanvasGradient_('gradient'); |
||
748 | gradient.x0_ = aX0; |
||
749 | gradient.y0_ = aY0; |
||
750 | gradient.x1_ = aX1; |
||
751 | gradient.y1_ = aY1; |
||
752 | return gradient;
|
||
753 | }; |
||
754 | |||
755 | contextPrototype.createRadialGradient = function(aX0, aY0, aR0, |
||
756 | aX1, aY1, aR1) { |
||
757 | var gradient = new CanvasGradient_('gradientradial'); |
||
758 | gradient.x0_ = aX0; |
||
759 | gradient.y0_ = aY0; |
||
760 | gradient.r0_ = aR0; |
||
761 | gradient.x1_ = aX1; |
||
762 | gradient.y1_ = aY1; |
||
763 | gradient.r1_ = aR1; |
||
764 | return gradient;
|
||
765 | }; |
||
766 | |||
767 | contextPrototype.drawImage = function(image, var_args) { |
||
768 | var dx, dy, dw, dh, sx, sy, sw, sh;
|
||
769 | |||
770 | // to find the original width we overide the width and height
|
||
771 | var oldRuntimeWidth = image.runtimeStyle.width;
|
||
772 | var oldRuntimeHeight = image.runtimeStyle.height;
|
||
773 | image.runtimeStyle.width = 'auto';
|
||
774 | image.runtimeStyle.height = 'auto';
|
||
775 | |||
776 | // get the original size
|
||
777 | var w = image.width;
|
||
778 | var h = image.height;
|
||
779 | |||
780 | // and remove overides
|
||
781 | image.runtimeStyle.width = oldRuntimeWidth; |
||
782 | image.runtimeStyle.height = oldRuntimeHeight; |
||
783 | |||
784 | if (arguments.length == 3) { |
||
785 | dx = arguments[1]; |
||
786 | dy = arguments[2]; |
||
787 | sx = sy = 0;
|
||
788 | sw = dw = w; |
||
789 | sh = dh = h; |
||
790 | } else if (arguments.length == 5) { |
||
791 | dx = arguments[1]; |
||
792 | dy = arguments[2]; |
||
793 | dw = arguments[3]; |
||
794 | dh = arguments[4]; |
||
795 | sx = sy = 0;
|
||
796 | sw = w; |
||
797 | sh = h; |
||
798 | } else if (arguments.length == 9) { |
||
799 | sx = arguments[1]; |
||
800 | sy = arguments[2]; |
||
801 | sw = arguments[3]; |
||
802 | sh = arguments[4]; |
||
803 | dx = arguments[5]; |
||
804 | dy = arguments[6]; |
||
805 | dw = arguments[7]; |
||
806 | dh = arguments[8]; |
||
807 | } else {
|
||
808 | throw Error('Invalid number of arguments'); |
||
809 | } |
||
810 | |||
811 | var d = this.getCoords_(dx, dy); |
||
812 | |||
813 | var w2 = sw / 2; |
||
814 | var h2 = sh / 2; |
||
815 | |||
816 | var vmlStr = [];
|
||
817 | |||
818 | var W = 10; |
||
819 | var H = 10; |
||
820 | |||
821 | // For some reason that I've now forgotten, using divs didn't work
|
||
822 | vmlStr.push(' <g_vml_:group',
|
||
823 | ' coordsize="', Z * W, ',', Z * H, '"', |
||
824 | ' coordorigin="0,0"' ,
|
||
825 | ' style="width:', W, 'px;height:', H, 'px;position:absolute;'); |
||
826 | |||
827 | // If filters are necessary (rotation exists), create them
|
||
828 | // filters are bog-slow, so only create them if abbsolutely necessary
|
||
829 | // The following check doesn't account for skews (which don't exist
|
||
830 | // in the canvas spec (yet) anyway.
|
||
831 | |||
832 | if (this.m_[0][0] != 1 || this.m_[0][1] || |
||
833 | this.m_[1][1] != 1 || this.m_[1][0]) { |
||
834 | var filter = [];
|
||
835 | |||
836 | // Note the 12/21 reversal
|
||
837 | filter.push('M11=', this.m_[0][0], ',', |
||
838 | 'M12=', this.m_[1][0], ',', |
||
839 | 'M21=', this.m_[0][1], ',', |
||
840 | 'M22=', this.m_[1][1], ',', |
||
841 | 'Dx=', mr(d.x / Z), ',', |
||
842 | 'Dy=', mr(d.y / Z), ''); |
||
843 | |||
844 | // Bounding box calculation (need to minimize displayed area so that
|
||
845 | // filters don't waste time on unused pixels.
|
||
846 | var max = d;
|
||
847 | var c2 = this.getCoords_(dx + dw, dy); |
||
848 | var c3 = this.getCoords_(dx, dy + dh); |
||
849 | var c4 = this.getCoords_(dx + dw, dy + dh); |
||
850 | |||
851 | max.x = m.max(max.x, c2.x, c3.x, c4.x); |
||
852 | max.y = m.max(max.y, c2.y, c3.y, c4.y); |
||
853 | |||
854 | vmlStr.push('padding:0 ', mr(max.x / Z), 'px ', mr(max.y / Z), |
||
855 | 'px 0;filter:progid:DXImageTransform.Microsoft.Matrix(',
|
||
856 | filter.join(''), ", sizingmethod='clip');"); |
||
857 | |||
858 | } else {
|
||
859 | vmlStr.push('top:', mr(d.y / Z), 'px;left:', mr(d.x / Z), 'px;'); |
||
860 | } |
||
861 | |||
862 | vmlStr.push(' ">' ,
|
||
863 | '<g_vml_:image src="', image.src, '"', |
||
864 | ' style="width:', Z * dw, 'px;', |
||
865 | ' height:', Z * dh, 'px"', |
||
866 | ' cropleft="', sx / w, '"', |
||
867 | ' croptop="', sy / h, '"', |
||
868 | ' cropright="', (w - sx - sw) / w, '"', |
||
869 | ' cropbottom="', (h - sy - sh) / h, '"', |
||
870 | ' />',
|
||
871 | '</g_vml_:group>');
|
||
872 | |||
873 | this.element_.insertAdjacentHTML('BeforeEnd', vmlStr.join('')); |
||
874 | }; |
||
875 | |||
876 | contextPrototype.stroke = function(aFill) { |
||
877 | var W = 10; |
||
878 | var H = 10; |
||
879 | // Divide the shape into chunks if it's too long because IE has a limit
|
||
880 | // somewhere for how long a VML shape can be. This simple division does
|
||
881 | // not work with fills, only strokes, unfortunately.
|
||
882 | var chunkSize = 5000; |
||
883 | |||
884 | var min = {x: null, y: null}; |
||
885 | var max = {x: null, y: null}; |
||
886 | |||
887 | for (var j = 0; j < this.currentPath_.length; j += chunkSize) { |
||
888 | var lineStr = [];
|
||
889 | var lineOpen = false; |
||
890 | |||
891 | lineStr.push('<g_vml_:shape',
|
||
892 | ' filled="', !!aFill, '"', |
||
893 | ' style="position:absolute;width:', W, 'px;height:', H, 'px;"', |
||
894 | ' coordorigin="0,0"',
|
||
895 | ' coordsize="', Z * W, ',', Z * H, '"', |
||
896 | ' stroked="', !aFill, '"', |
||
897 | ' path="');
|
||
898 | |||
899 | var newSeq = false; |
||
900 | |||
901 | for (var i = j; i < Math.min(j + chunkSize, this.currentPath_.length); i++) { |
||
902 | if (i % chunkSize == 0 && i > 0) { // move into position for next chunk |
||
903 | lineStr.push(' m ', mr(this.currentPath_[i-1].x), ',', mr(this.currentPath_[i-1].y)); |
||
904 | } |
||
905 | |||
906 | var p = this.currentPath_[i]; |
||
907 | var c;
|
||
908 | |||
909 | switch (p.type) {
|
||
910 | case 'moveTo': |
||
911 | c = p; |
||
912 | lineStr.push(' m ', mr(p.x), ',', mr(p.y)); |
||
913 | break;
|
||
914 | case 'lineTo': |
||
915 | lineStr.push(' l ', mr(p.x), ',', mr(p.y)); |
||
916 | break;
|
||
917 | case 'close': |
||
918 | lineStr.push(' x ');
|
||
919 | p = null;
|
||
920 | break;
|
||
921 | case 'bezierCurveTo': |
||
922 | lineStr.push(' c ',
|
||
923 | mr(p.cp1x), ',', mr(p.cp1y), ',', |
||
924 | mr(p.cp2x), ',', mr(p.cp2y), ',', |
||
925 | mr(p.x), ',', mr(p.y));
|
||
926 | break;
|
||
927 | case 'at': |
||
928 | case 'wa': |
||
929 | lineStr.push(' ', p.type, ' ', |
||
930 | mr(p.x - this.arcScaleX_ * p.radius), ',', |
||
931 | mr(p.y - this.arcScaleY_ * p.radius), ' ', |
||
932 | mr(p.x + this.arcScaleX_ * p.radius), ',', |
||
933 | mr(p.y + this.arcScaleY_ * p.radius), ' ', |
||
934 | mr(p.xStart), ',', mr(p.yStart), ' ', |
||
935 | mr(p.xEnd), ',', mr(p.yEnd));
|
||
936 | break;
|
||
937 | } |
||
938 | |||
939 | |||
940 | // TODO: Following is broken for curves due to
|
||
941 | // move to proper paths.
|
||
942 | |||
943 | // Figure out dimensions so we can do gradient fills
|
||
944 | // properly
|
||
945 | if (p) {
|
||
946 | if (min.x == null || p.x < min.x) { |
||
947 | min.x = p.x; |
||
948 | } |
||
949 | if (max.x == null || p.x > max.x) { |
||
950 | max.x = p.x; |
||
951 | } |
||
952 | if (min.y == null || p.y < min.y) { |
||
953 | min.y = p.y; |
||
954 | } |
||
955 | if (max.y == null || p.y > max.y) { |
||
956 | max.y = p.y; |
||
957 | } |
||
958 | } |
||
959 | } |
||
960 | lineStr.push(' ">');
|
||
961 | |||
962 | if (!aFill) {
|
||
963 | appendStroke(this, lineStr);
|
||
964 | } else {
|
||
965 | appendFill(this, lineStr, min, max);
|
||
966 | } |
||
967 | |||
968 | lineStr.push('</g_vml_:shape>');
|
||
969 | |||
970 | this.element_.insertAdjacentHTML('beforeEnd', lineStr.join('')); |
||
971 | } |
||
972 | }; |
||
973 | |||
974 | function appendStroke(ctx, lineStr) { |
||
975 | var a = processStyle(ctx.strokeStyle);
|
||
976 | var color = a.color;
|
||
977 | var opacity = a.alpha * ctx.globalAlpha;
|
||
978 | var lineWidth = ctx.lineScale_ * ctx.lineWidth;
|
||
979 | |||
980 | // VML cannot correctly render a line if the width is less than 1px.
|
||
981 | // In that case, we dilute the color to make the line look thinner.
|
||
982 | if (lineWidth < 1) { |
||
983 | opacity *= lineWidth; |
||
984 | } |
||
985 | |||
986 | lineStr.push( |
||
987 | '<g_vml_:stroke',
|
||
988 | ' opacity="', opacity, '"', |
||
989 | ' joinstyle="', ctx.lineJoin, '"', |
||
990 | ' miterlimit="', ctx.miterLimit, '"', |
||
991 | ' endcap="', processLineCap(ctx.lineCap), '"', |
||
992 | ' weight="', lineWidth, 'px"', |
||
993 | ' color="', color, '" />' |
||
994 | ); |
||
995 | } |
||
996 | |||
997 | function appendFill(ctx, lineStr, min, max) { |
||
998 | var fillStyle = ctx.fillStyle;
|
||
999 | var arcScaleX = ctx.arcScaleX_;
|
||
1000 | var arcScaleY = ctx.arcScaleY_;
|
||
1001 | var width = max.x - min.x;
|
||
1002 | var height = max.y - min.y;
|
||
1003 | if (fillStyle instanceof CanvasGradient_) { |
||
1004 | // TODO: Gradients transformed with the transformation matrix.
|
||
1005 | var angle = 0; |
||
1006 | var focus = {x: 0, y: 0}; |
||
1007 | |||
1008 | // additional offset
|
||
1009 | var shift = 0; |
||
1010 | // scale factor for offset
|
||
1011 | var expansion = 1; |
||
1012 | |||
1013 | if (fillStyle.type_ == 'gradient') { |
||
1014 | var x0 = fillStyle.x0_ / arcScaleX;
|
||
1015 | var y0 = fillStyle.y0_ / arcScaleY;
|
||
1016 | var x1 = fillStyle.x1_ / arcScaleX;
|
||
1017 | var y1 = fillStyle.y1_ / arcScaleY;
|
||
1018 | var p0 = ctx.getCoords_(x0, y0);
|
||
1019 | var p1 = ctx.getCoords_(x1, y1);
|
||
1020 | var dx = p1.x - p0.x;
|
||
1021 | var dy = p1.y - p0.y;
|
||
1022 | angle = Math.atan2(dx, dy) * 180 / Math.PI;
|
||
1023 | |||
1024 | // The angle should be a non-negative number.
|
||
1025 | if (angle < 0) { |
||
1026 | angle += 360;
|
||
1027 | } |
||
1028 | |||
1029 | // Very small angles produce an unexpected result because they are
|
||
1030 | // converted to a scientific notation string.
|
||
1031 | if (angle < 1e-6) { |
||
1032 | angle = 0;
|
||
1033 | } |
||
1034 | } else {
|
||
1035 | var p0 = ctx.getCoords_(fillStyle.x0_, fillStyle.y0_);
|
||
1036 | focus = { |
||
1037 | x: (p0.x - min.x) / width,
|
||
1038 | y: (p0.y - min.y) / height
|
||
1039 | }; |
||
1040 | |||
1041 | width /= arcScaleX * Z; |
||
1042 | height /= arcScaleY * Z; |
||
1043 | var dimension = m.max(width, height);
|
||
1044 | shift = 2 * fillStyle.r0_ / dimension;
|
||
1045 | expansion = 2 * fillStyle.r1_ / dimension - shift;
|
||
1046 | } |
||
1047 | |||
1048 | // We need to sort the color stops in ascending order by offset,
|
||
1049 | // otherwise IE won't interpret it correctly.
|
||
1050 | var stops = fillStyle.colors_;
|
||
1051 | stops.sort(function(cs1, cs2) {
|
||
1052 | return cs1.offset - cs2.offset;
|
||
1053 | }); |
||
1054 | |||
1055 | var length = stops.length;
|
||
1056 | var color1 = stops[0].color; |
||
1057 | var color2 = stops[length - 1].color; |
||
1058 | var opacity1 = stops[0].alpha * ctx.globalAlpha; |
||
1059 | var opacity2 = stops[length - 1].alpha * ctx.globalAlpha; |
||
1060 | |||
1061 | var colors = [];
|
||
1062 | for (var i = 0; i < length; i++) { |
||
1063 | var stop = stops[i];
|
||
1064 | colors.push(stop.offset * expansion + shift + ' ' + stop.color);
|
||
1065 | } |
||
1066 | |||
1067 | // When colors attribute is used, the meanings of opacity and o:opacity2
|
||
1068 | // are reversed.
|
||
1069 | lineStr.push('<g_vml_:fill type="', fillStyle.type_, '"', |
||
1070 | ' method="none" focus="100%"',
|
||
1071 | ' color="', color1, '"', |
||
1072 | ' color2="', color2, '"', |
||
1073 | ' colors="', colors.join(','), '"', |
||
1074 | ' opacity="', opacity2, '"', |
||
1075 | ' g_o_:opacity2="', opacity1, '"', |
||
1076 | ' angle="', angle, '"', |
||
1077 | ' focusposition="', focus.x, ',', focus.y, '" />'); |
||
1078 | } else if (fillStyle instanceof CanvasPattern_) { |
||
1079 | if (width && height) {
|
||
1080 | var deltaLeft = -min.x;
|
||
1081 | var deltaTop = -min.y;
|
||
1082 | lineStr.push('<g_vml_:fill',
|
||
1083 | ' position="',
|
||
1084 | deltaLeft / width * arcScaleX * arcScaleX, ',',
|
||
1085 | deltaTop / height * arcScaleY * arcScaleY, '"',
|
||
1086 | ' type="tile"',
|
||
1087 | // TODO: Figure out the correct size to fit the scale.
|
||
1088 | //' size="', w, 'px ', h, 'px"',
|
||
1089 | ' src="', fillStyle.src_, '" />'); |
||
1090 | } |
||
1091 | } else {
|
||
1092 | var a = processStyle(ctx.fillStyle);
|
||
1093 | var color = a.color;
|
||
1094 | var opacity = a.alpha * ctx.globalAlpha;
|
||
1095 | lineStr.push('<g_vml_:fill color="', color, '" opacity="', opacity, |
||
1096 | '" />');
|
||
1097 | } |
||
1098 | } |
||
1099 | |||
1100 | contextPrototype.fill = function() { |
||
1101 | this.stroke(true); |
||
1102 | }; |
||
1103 | |||
1104 | contextPrototype.closePath = function() { |
||
1105 | this.currentPath_.push({type: 'close'}); |
||
1106 | }; |
||
1107 | |||
1108 | /**
|
||
1109 | * @private
|
||
1110 | */
|
||
1111 | contextPrototype.getCoords_ = function(aX, aY) { |
||
1112 | var m = this.m_; |
||
1113 | return {
|
||
1114 | x: Z * (aX * m[0][0] + aY * m[1][0] + m[2][0]) - Z2, |
||
1115 | y: Z * (aX * m[0][1] + aY * m[1][1] + m[2][1]) - Z2 |
||
1116 | }; |
||
1117 | }; |
||
1118 | |||
1119 | contextPrototype.save = function() { |
||
1120 | var o = {};
|
||
1121 | copyState(this, o);
|
||
1122 | this.aStack_.push(o);
|
||
1123 | this.mStack_.push(this.m_); |
||
1124 | this.m_ = matrixMultiply(createMatrixIdentity(), this.m_); |
||
1125 | }; |
||
1126 | |||
1127 | contextPrototype.restore = function() { |
||
1128 | if (this.aStack_.length) { |
||
1129 | copyState(this.aStack_.pop(), this); |
||
1130 | this.m_ = this.mStack_.pop(); |
||
1131 | } |
||
1132 | }; |
||
1133 | |||
1134 | function matrixIsFinite(m) { |
||
1135 | return isFinite(m[0][0]) && isFinite(m[0][1]) && |
||
1136 | isFinite(m[1][0]) && isFinite(m[1][1]) && |
||
1137 | isFinite(m[2][0]) && isFinite(m[2][1]); |
||
1138 | } |
||
1139 | |||
1140 | function setM(ctx, m, updateLineScale) { |
||
1141 | if (!matrixIsFinite(m)) {
|
||
1142 | return;
|
||
1143 | } |
||
1144 | ctx.m_ = m; |
||
1145 | |||
1146 | if (updateLineScale) {
|
||
1147 | // Get the line scale.
|
||
1148 | // Determinant of this.m_ means how much the area is enlarged by the
|
||
1149 | // transformation. So its square root can be used as a scale factor
|
||
1150 | // for width.
|
||
1151 | var det = m[0][0] * m[1][1] - m[0][1] * m[1][0]; |
||
1152 | ctx.lineScale_ = sqrt(abs(det)); |
||
1153 | } |
||
1154 | } |
||
1155 | |||
1156 | contextPrototype.translate = function(aX, aY) { |
||
1157 | var m1 = [
|
||
1158 | [1, 0, 0], |
||
1159 | [0, 1, 0], |
||
1160 | [aX, aY, 1]
|
||
1161 | ]; |
||
1162 | |||
1163 | setM(this, matrixMultiply(m1, this.m_), false); |
||
1164 | }; |
||
1165 | |||
1166 | contextPrototype.rotate = function(aRot) { |
||
1167 | var c = mc(aRot);
|
||
1168 | var s = ms(aRot);
|
||
1169 | |||
1170 | var m1 = [
|
||
1171 | [c, s, 0],
|
||
1172 | [-s, c, 0],
|
||
1173 | [0, 0, 1] |
||
1174 | ]; |
||
1175 | |||
1176 | setM(this, matrixMultiply(m1, this.m_), false); |
||
1177 | }; |
||
1178 | |||
1179 | contextPrototype.scale = function(aX, aY) { |
||
1180 | this.arcScaleX_ *= aX;
|
||
1181 | this.arcScaleY_ *= aY;
|
||
1182 | var m1 = [
|
||
1183 | [aX, 0, 0], |
||
1184 | [0, aY, 0], |
||
1185 | [0, 0, 1] |
||
1186 | ]; |
||
1187 | |||
1188 | setM(this, matrixMultiply(m1, this.m_), true); |
||
1189 | }; |
||
1190 | |||
1191 | contextPrototype.transform = function(m11, m12, m21, m22, dx, dy) { |
||
1192 | var m1 = [
|
||
1193 | [m11, m12, 0],
|
||
1194 | [m21, m22, 0],
|
||
1195 | [dx, dy, 1]
|
||
1196 | ]; |
||
1197 | |||
1198 | setM(this, matrixMultiply(m1, this.m_), true); |
||
1199 | }; |
||
1200 | |||
1201 | contextPrototype.setTransform = function(m11, m12, m21, m22, dx, dy) { |
||
1202 | var m = [
|
||
1203 | [m11, m12, 0],
|
||
1204 | [m21, m22, 0],
|
||
1205 | [dx, dy, 1]
|
||
1206 | ]; |
||
1207 | |||
1208 | setM(this, m, true); |
||
1209 | }; |
||
1210 | |||
1211 | /**
|
||
1212 | * The text drawing function.
|
||
1213 | * The maxWidth argument isn't taken in account, since no browser supports
|
||
1214 | * it yet.
|
||
1215 | */
|
||
1216 | contextPrototype.drawText_ = function(text, x, y, maxWidth, stroke) { |
||
1217 | var m = this.m_, |
||
1218 | delta = 1000,
|
||
1219 | left = 0,
|
||
1220 | right = delta, |
||
1221 | offset = {x: 0, y: 0}, |
||
1222 | lineStr = []; |
||
1223 | |||
1224 | var fontStyle = getComputedStyle(processFontStyle(this.font), |
||
1225 | this.element_);
|
||
1226 | |||
1227 | var fontStyleString = buildStyle(fontStyle);
|
||
1228 | |||
1229 | var elementStyle = this.element_.currentStyle; |
||
1230 | var textAlign = this.textAlign.toLowerCase(); |
||
1231 | switch (textAlign) {
|
||
1232 | case 'left': |
||
1233 | case 'center': |
||
1234 | case 'right': |
||
1235 | break;
|
||
1236 | case 'end': |
||
1237 | textAlign = elementStyle.direction == 'ltr' ? 'right' : 'left'; |
||
1238 | break;
|
||
1239 | case 'start': |
||
1240 | textAlign = elementStyle.direction == 'rtl' ? 'right' : 'left'; |
||
1241 | break;
|
||
1242 | default:
|
||
1243 | textAlign = 'left';
|
||
1244 | } |
||
1245 | |||
1246 | // 1.75 is an arbitrary number, as there is no info about the text baseline
|
||
1247 | switch (this.textBaseline) { |
||
1248 | case 'hanging': |
||
1249 | case 'top': |
||
1250 | offset.y = fontStyle.size / 1.75;
|
||
1251 | break;
|
||
1252 | case 'middle': |
||
1253 | break;
|
||
1254 | default:
|
||
1255 | case null: |
||
1256 | case 'alphabetic': |
||
1257 | case 'ideographic': |
||
1258 | case 'bottom': |
||
1259 | offset.y = -fontStyle.size / 2.25;
|
||
1260 | break;
|
||
1261 | } |
||
1262 | |||
1263 | switch(textAlign) {
|
||
1264 | case 'right': |
||
1265 | left = delta; |
||
1266 | right = 0.05;
|
||
1267 | break;
|
||
1268 | case 'center': |
||
1269 | left = right = delta / 2;
|
||
1270 | break;
|
||
1271 | } |
||
1272 | |||
1273 | var d = this.getCoords_(x + offset.x, y + offset.y); |
||
1274 | |||
1275 | lineStr.push('<g_vml_:line from="', -left ,' 0" to="', right ,' 0.05" ', |
||
1276 | ' coordsize="100 100" coordorigin="0 0"',
|
||
1277 | ' filled="', !stroke, '" stroked="', !!stroke, |
||
1278 | '" style="position:absolute;width:1px;height:1px;">');
|
||
1279 | |||
1280 | if (stroke) {
|
||
1281 | appendStroke(this, lineStr);
|
||
1282 | } else {
|
||
1283 | // TODO: Fix the min and max params.
|
||
1284 | appendFill(this, lineStr, {x: -left, y: 0}, |
||
1285 | {x: right, y: fontStyle.size}); |
||
1286 | } |
||
1287 | |||
1288 | var skewM = m[0][0].toFixed(3) + ',' + m[1][0].toFixed(3) + ',' + |
||
1289 | m[0][1].toFixed(3) + ',' + m[1][1].toFixed(3) + ',0,0'; |
||
1290 | |||
1291 | var skewOffset = mr(d.x / Z) + ',' + mr(d.y / Z); |
||
1292 | |||
1293 | lineStr.push('<g_vml_:skew on="t" matrix="', skewM ,'" ', |
||
1294 | ' offset="', skewOffset, '" origin="', left ,' 0" />', |
||
1295 | '<g_vml_:path textpathok="true" />',
|
||
1296 | '<g_vml_:textpath on="true" string="',
|
||
1297 | encodeHtmlAttribute(text), |
||
1298 | '" style="v-text-align:', textAlign,
|
||
1299 | ';font:', encodeHtmlAttribute(fontStyleString),
|
||
1300 | '" /></g_vml_:line>');
|
||
1301 | |||
1302 | this.element_.insertAdjacentHTML('beforeEnd', lineStr.join('')); |
||
1303 | }; |
||
1304 | |||
1305 | contextPrototype.fillText = function(text, x, y, maxWidth) { |
||
1306 | this.drawText_(text, x, y, maxWidth, false); |
||
1307 | }; |
||
1308 | |||
1309 | contextPrototype.strokeText = function(text, x, y, maxWidth) { |
||
1310 | this.drawText_(text, x, y, maxWidth, true); |
||
1311 | }; |
||
1312 | |||
1313 | contextPrototype.measureText = function(text) { |
||
1314 | if (!this.textMeasureEl_) { |
||
1315 | var s = '<span style="position:absolute;' + |
||
1316 | 'top:-20000px;left:0;padding:0;margin:0;border:none;' +
|
||
1317 | 'white-space:pre;"></span>';
|
||
1318 | this.element_.insertAdjacentHTML('beforeEnd', s); |
||
1319 | this.textMeasureEl_ = this.element_.lastChild; |
||
1320 | } |
||
1321 | var doc = this.element_.ownerDocument; |
||
1322 | this.textMeasureEl_.innerHTML = ''; |
||
1323 | this.textMeasureEl_.style.font = this.font; |
||
1324 | // Don't use innerHTML or innerText because they allow markup/whitespace.
|
||
1325 | this.textMeasureEl_.appendChild(doc.createTextNode(text));
|
||
1326 | return {width: this.textMeasureEl_.offsetWidth}; |
||
1327 | }; |
||
1328 | |||
1329 | /******** STUBS ********/
|
||
1330 | contextPrototype.clip = function() { |
||
1331 | // TODO: Implement
|
||
1332 | }; |
||
1333 | |||
1334 | contextPrototype.arcTo = function() { |
||
1335 | // TODO: Implement
|
||
1336 | }; |
||
1337 | |||
1338 | contextPrototype.createPattern = function(image, repetition) { |
||
1339 | return new CanvasPattern_(image, repetition); |
||
1340 | }; |
||
1341 | |||
1342 | // Gradient / Pattern Stubs
|
||
1343 | function CanvasGradient_(aType) { |
||
1344 | this.type_ = aType;
|
||
1345 | this.x0_ = 0; |
||
1346 | this.y0_ = 0; |
||
1347 | this.r0_ = 0; |
||
1348 | this.x1_ = 0; |
||
1349 | this.y1_ = 0; |
||
1350 | this.r1_ = 0; |
||
1351 | this.colors_ = [];
|
||
1352 | } |
||
1353 | |||
1354 | CanvasGradient_.prototype.addColorStop = function(aOffset, aColor) { |
||
1355 | aColor = processStyle(aColor); |
||
1356 | this.colors_.push({offset: aOffset, |
||
1357 | color: aColor.color,
|
||
1358 | alpha: aColor.alpha});
|
||
1359 | }; |
||
1360 | |||
1361 | function CanvasPattern_(image, repetition) { |
||
1362 | assertImageIsValid(image); |
||
1363 | switch (repetition) {
|
||
1364 | case 'repeat': |
||
1365 | case null: |
||
1366 | case '': |
||
1367 | this.repetition_ = 'repeat'; |
||
1368 | break
|
||
1369 | case 'repeat-x': |
||
1370 | case 'repeat-y': |
||
1371 | case 'no-repeat': |
||
1372 | this.repetition_ = repetition;
|
||
1373 | break;
|
||
1374 | default:
|
||
1375 | throwException('SYNTAX_ERR');
|
||
1376 | } |
||
1377 | |||
1378 | this.src_ = image.src;
|
||
1379 | this.width_ = image.width;
|
||
1380 | this.height_ = image.height;
|
||
1381 | } |
||
1382 | |||
1383 | function throwException(s) { |
||
1384 | throw new DOMException_(s); |
||
1385 | } |
||
1386 | |||
1387 | function assertImageIsValid(img) { |
||
1388 | if (!img || img.nodeType != 1 || img.tagName != 'IMG') { |
||
1389 | throwException('TYPE_MISMATCH_ERR');
|
||
1390 | } |
||
1391 | if (img.readyState != 'complete') { |
||
1392 | throwException('INVALID_STATE_ERR');
|
||
1393 | } |
||
1394 | } |
||
1395 | |||
1396 | function DOMException_(s) { |
||
1397 | this.code = this[s]; |
||
1398 | this.message = s +': DOM Exception ' + this.code; |
||
1399 | } |
||
1400 | var p = DOMException_.prototype = new Error; |
||
1401 | p.INDEX_SIZE_ERR = 1;
|
||
1402 | p.DOMSTRING_SIZE_ERR = 2;
|
||
1403 | p.HIERARCHY_REQUEST_ERR = 3;
|
||
1404 | p.WRONG_DOCUMENT_ERR = 4;
|
||
1405 | p.INVALID_CHARACTER_ERR = 5;
|
||
1406 | p.NO_DATA_ALLOWED_ERR = 6;
|
||
1407 | p.NO_MODIFICATION_ALLOWED_ERR = 7;
|
||
1408 | p.NOT_FOUND_ERR = 8;
|
||
1409 | p.NOT_SUPPORTED_ERR = 9;
|
||
1410 | p.INUSE_ATTRIBUTE_ERR = 10;
|
||
1411 | p.INVALID_STATE_ERR = 11;
|
||
1412 | p.SYNTAX_ERR = 12;
|
||
1413 | p.INVALID_MODIFICATION_ERR = 13;
|
||
1414 | p.NAMESPACE_ERR = 14;
|
||
1415 | p.INVALID_ACCESS_ERR = 15;
|
||
1416 | p.VALIDATION_ERR = 16;
|
||
1417 | p.TYPE_MISMATCH_ERR = 17;
|
||
1418 | |||
1419 | // set up externs
|
||
1420 | G_vmlCanvasManager = G_vmlCanvasManager_; |
||
1421 | CanvasRenderingContext2D = CanvasRenderingContext2D_; |
||
1422 | CanvasGradient = CanvasGradient_; |
||
1423 | CanvasPattern = CanvasPattern_; |
||
1424 | DOMException = DOMException_; |
||
1425 | })(); |
||
1426 | |||
1427 | } // if |