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| 58d006 | 1 | // Copyright 2006 Google Inc. |
| A | 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); | |
| 4 | // you may not use this file except in compliance with the License. | |
| 5 | // You may obtain a copy of the License at | |
| 6 | // | |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 | |
| 8 | // | |
| 9 | // Unless required by applicable law or agreed to in writing, software | |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, | |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 12 | // See the License for the specific language governing permissions and | |
| 13 | // limitations under the License. | |
| 14 | ||
| 15 | ||
| 16 | // Known Issues: | |
| 17 | // | |
| 18 | // * Patterns only support repeat. | |
| 19 | // * Radial gradient are not implemented. The VML version of these look very | |
| 20 | // different from the canvas one. | |
| 21 | // * Clipping paths are not implemented. | |
| 22 | // * Coordsize. The width and height attribute have higher priority than the | |
| 23 | // width and height style values which isn't correct. | |
| 24 | // * Painting mode isn't implemented. | |
| 25 | // * Canvas width/height should is using content-box by default. IE in | |
| 26 | // Quirks mode will draw the canvas using border-box. Either change your | |
| 27 | // doctype to HTML5 | |
| 28 | // (http://www.whatwg.org/specs/web-apps/current-work/#the-doctype) | |
| 29 | // or use Box Sizing Behavior from WebFX | |
| 30 | // (http://webfx.eae.net/dhtml/boxsizing/boxsizing.html) | |
| 31 | // * Non uniform scaling does not correctly scale strokes. | |
| 32 | // * Filling very large shapes (above 5000 points) is buggy. | |
| 33 | // * Optimize. There is always room for speed improvements. | |
| 34 | ||
| 35 | // Only add this code if we do not already have a canvas implementation | |
| 36 | if (!document.createElement('canvas').getContext) { | |
| 37 | ||
| 38 | (function() { | |
| 39 | ||
| 40 | // alias some functions to make (compiled) code shorter | |
| 41 | var m = Math; | |
| 42 | var mr = m.round; | |
| 43 | var ms = m.sin; | |
| 44 | var mc = m.cos; | |
| 45 | var abs = m.abs; | |
| 46 | var sqrt = m.sqrt; | |
| 47 | ||
| 48 | // this is used for sub pixel precision | |
| 49 | var Z = 10; | |
| 50 | var Z2 = Z / 2; | |
| 51 | ||
| 52 | var IE_VERSION = +navigator.userAgent.match(/MSIE ([\d.]+)?/)[1]; | |
| 53 | ||
| 54 | /** | |
| 55 | * This funtion is assigned to the <canvas> elements as element.getContext(). | |
| 56 | * @this {HTMLElement} | |
| 57 | * @return {CanvasRenderingContext2D_} | |
| 58 | */ | |
| 59 | function getContext() { | |
| 60 | return this.context_ || | |
| 61 | (this.context_ = new CanvasRenderingContext2D_(this)); | |
| 62 | } | |
| 63 | ||
| 64 | var slice = Array.prototype.slice; | |
| 65 | ||
| 66 | /** | |
| 67 | * Binds a function to an object. The returned function will always use the | |
| 68 | * passed in {@code obj} as {@code this}. | |
| 69 | * | |
| 70 | * Example: | |
| 71 | * | |
| 72 | * g = bind(f, obj, a, b) | |
| 73 | * g(c, d) // will do f.call(obj, a, b, c, d) | |
| 74 | * | |
| 75 | * @param {Function} f The function to bind the object to | |
| 76 | * @param {Object} obj The object that should act as this when the function | |
| 77 | * is called | |
| 78 | * @param {*} var_args Rest arguments that will be used as the initial | |
| 79 | * arguments when the function is called | |
| 80 | * @return {Function} A new function that has bound this | |
| 81 | */ | |
| 82 | function bind(f, obj, var_args) { | |
| 83 | var a = slice.call(arguments, 2); | |
| 84 | return function() { | |
| 85 | return f.apply(obj, a.concat(slice.call(arguments))); | |
| 86 | }; | |
| 87 | } | |
| 88 | ||
| 89 | function encodeHtmlAttribute(s) { | |
| 90 | return String(s).replace(/&/g, '&').replace(/"/g, '"'); | |
| 91 | } | |
| 92 | ||
| 93 | function addNamespace(doc, prefix, urn) { | |
| 94 | if (!doc.namespaces[prefix]) { | |
| 95 | doc.namespaces.add(prefix, urn, '#default#VML'); | |
| 96 | } | |
| 97 | } | |
| 98 | ||
| 99 | function addNamespacesAndStylesheet(doc) { | |
| 100 | addNamespace(doc, 'g_vml_', 'urn:schemas-microsoft-com:vml'); | |
| 101 | addNamespace(doc, 'g_o_', 'urn:schemas-microsoft-com:office:office'); | |
| 102 | ||
| 103 | // Setup default CSS. Only add one style sheet per document | |
| 104 | if (!doc.styleSheets['ex_canvas_']) { | |
| 105 | var ss = doc.createStyleSheet(); | |
| 106 | ss.owningElement.id = 'ex_canvas_'; | |
| 107 | ss.cssText = 'canvas{display:inline-block;overflow:hidden;' + | |
| 108 | // default size is 300x150 in Gecko and Opera | |
| 109 | 'text-align:left;width:300px;height:150px}'; | |
| 110 | } | |
| 111 | } | |
| 112 | ||
| 113 | // Add namespaces and stylesheet at startup. | |
| 114 | addNamespacesAndStylesheet(document); | |
| 115 | ||
| 116 | var G_vmlCanvasManager_ = { | |
| 117 | init: function(opt_doc) { | |
| 118 | var doc = opt_doc || document; | |
| 119 | // Create a dummy element so that IE will allow canvas elements to be | |
| 120 | // recognized. | |
| 121 | doc.createElement('canvas'); | |
| 122 | doc.attachEvent('onreadystatechange', bind(this.init_, this, doc)); | |
| 123 | }, | |
| 124 | ||
| 125 | init_: function(doc) { | |
| 126 | // find all canvas elements | |
| 127 | var els = doc.getElementsByTagName('canvas'); | |
| 128 | for (var i = 0; i < els.length; i++) { | |
| 129 | this.initElement(els[i]); | |
| 130 | } | |
| 131 | }, | |
| 132 | ||
| 133 | /** | |
| 134 | * Public initializes a canvas element so that it can be used as canvas | |
| 135 | * element from now on. This is called automatically before the page is | |
| 136 | * loaded but if you are creating elements using createElement you need to | |
| 137 | * make sure this is called on the element. | |
| 138 | * @param {HTMLElement} el The canvas element to initialize. | |
| 139 | * @return {HTMLElement} the element that was created. | |
| 140 | */ | |
| 141 | initElement: function(el) { | |
| 142 | if (!el.getContext) { | |
| 143 | el.getContext = getContext; | |
| 144 | ||
| 145 | // Add namespaces and stylesheet to document of the element. | |
| 146 | addNamespacesAndStylesheet(el.ownerDocument); | |
| 147 | ||
| 148 | // Remove fallback content. There is no way to hide text nodes so we | |
| 149 | // just remove all childNodes. We could hide all elements and remove | |
| 150 | // text nodes but who really cares about the fallback content. | |
| 151 | el.innerHTML = ''; | |
| 152 | ||
| 153 | // do not use inline function because that will leak memory | |
| 154 | el.attachEvent('onpropertychange', onPropertyChange); | |
| 155 | el.attachEvent('onresize', onResize); | |
| 156 | ||
| 157 | var attrs = el.attributes; | |
| 158 | if (attrs.width && attrs.width.specified) { | |
| 159 | // TODO: use runtimeStyle and coordsize | |
| 160 | // el.getContext().setWidth_(attrs.width.nodeValue); | |
| 161 | el.style.width = attrs.width.nodeValue + 'px'; | |
| 162 | } else { | |
| 163 | el.width = el.clientWidth; | |
| 164 | } | |
| 165 | if (attrs.height && attrs.height.specified) { | |
| 166 | // TODO: use runtimeStyle and coordsize | |
| 167 | // el.getContext().setHeight_(attrs.height.nodeValue); | |
| 168 | el.style.height = attrs.height.nodeValue + 'px'; | |
| 169 | } else { | |
| 170 | el.height = el.clientHeight; | |
| 171 | } | |
| 172 | //el.getContext().setCoordsize_() | |
| 173 | } | |
| 174 | return el; | |
| 175 | } | |
| 176 | }; | |
| 177 | ||
| 178 | function onPropertyChange(e) { | |
| 179 | var el = e.srcElement; | |
| 180 | ||
| 181 | switch (e.propertyName) { | |
| 182 | case 'width': | |
| 183 | el.getContext().clearRect(); | |
| 184 | el.style.width = el.attributes.width.nodeValue + 'px'; | |
| 185 | // In IE8 this does not trigger onresize. | |
| 186 | el.firstChild.style.width = el.clientWidth + 'px'; | |
| 187 | break; | |
| 188 | case 'height': | |
| 189 | el.getContext().clearRect(); | |
| 190 | el.style.height = el.attributes.height.nodeValue + 'px'; | |
| 191 | el.firstChild.style.height = el.clientHeight + 'px'; | |
| 192 | break; | |
| 193 | } | |
| 194 | } | |
| 195 | ||
| 196 | function onResize(e) { | |
| 197 | var el = e.srcElement; | |
| 198 | if (el.firstChild) { | |
| 199 | el.firstChild.style.width = el.clientWidth + 'px'; | |
| 200 | el.firstChild.style.height = el.clientHeight + 'px'; | |
| 201 | } | |
| 202 | } | |
| 203 | ||
| 204 | G_vmlCanvasManager_.init(); | |
| 205 | ||
| 206 | // precompute "00" to "FF" | |
| 207 | var decToHex = []; | |
| 208 | for (var i = 0; i < 16; i++) { | |
| 209 | for (var j = 0; j < 16; j++) { | |
| 210 | decToHex[i * 16 + j] = i.toString(16) + j.toString(16); | |
| 211 | } | |
| 212 | } | |
| 213 | ||
| 214 | function createMatrixIdentity() { | |
| 215 | return [ | |
| 216 | [1, 0, 0], | |
| 217 | [0, 1, 0], | |
| 218 | [0, 0, 1] | |
| 219 | ]; | |
| 220 | } | |
| 221 | ||
| 222 | function matrixMultiply(m1, m2) { | |
| 223 | var result = createMatrixIdentity(); | |
| 224 | ||
| 225 | for (var x = 0; x < 3; x++) { | |
| 226 | for (var y = 0; y < 3; y++) { | |
| 227 | var sum = 0; | |
| 228 | ||
| 229 | for (var z = 0; z < 3; z++) { | |
| 230 | sum += m1[x][z] * m2[z][y]; | |
| 231 | } | |
| 232 | ||
| 233 | result[x][y] = sum; | |
| 234 | } | |
| 235 | } | |
| 236 | return result; | |
| 237 | } | |
| 238 | ||
| 239 | function copyState(o1, o2) { | |
| 240 | o2.fillStyle = o1.fillStyle; | |
| 241 | o2.lineCap = o1.lineCap; | |
| 242 | o2.lineJoin = o1.lineJoin; | |
| 243 | o2.lineWidth = o1.lineWidth; | |
| 244 | o2.miterLimit = o1.miterLimit; | |
| 245 | o2.shadowBlur = o1.shadowBlur; | |
| 246 | o2.shadowColor = o1.shadowColor; | |
| 247 | o2.shadowOffsetX = o1.shadowOffsetX; | |
| 248 | o2.shadowOffsetY = o1.shadowOffsetY; | |
| 249 | o2.strokeStyle = o1.strokeStyle; | |
| 250 | o2.globalAlpha = o1.globalAlpha; | |
| 251 | o2.font = o1.font; | |
| 252 | o2.textAlign = o1.textAlign; | |
| 253 | o2.textBaseline = o1.textBaseline; | |
| 254 | o2.arcScaleX_ = o1.arcScaleX_; | |
| 255 | o2.arcScaleY_ = o1.arcScaleY_; | |
| 256 | o2.lineScale_ = o1.lineScale_; | |
| 257 | } | |
| 258 | ||
| 259 | var colorData = { | |
| 260 | aliceblue: '#F0F8FF', | |
| 261 | antiquewhite: '#FAEBD7', | |
| 262 | aquamarine: '#7FFFD4', | |
| 263 | azure: '#F0FFFF', | |
| 264 | beige: '#F5F5DC', | |
| 265 | bisque: '#FFE4C4', | |
| 266 | black: '#000000', | |
| 267 | blanchedalmond: '#FFEBCD', | |
| 268 | blueviolet: '#8A2BE2', | |
| 269 | brown: '#A52A2A', | |
| 270 | burlywood: '#DEB887', | |
| 271 | cadetblue: '#5F9EA0', | |
| 272 | chartreuse: '#7FFF00', | |
| 273 | chocolate: '#D2691E', | |
| 274 | coral: '#FF7F50', | |
| 275 | cornflowerblue: '#6495ED', | |
| 276 | cornsilk: '#FFF8DC', | |
| 277 | crimson: '#DC143C', | |
| 278 | cyan: '#00FFFF', | |
| 279 | darkblue: '#00008B', | |
| 280 | darkcyan: '#008B8B', | |
| 281 | darkgoldenrod: '#B8860B', | |
| 282 | darkgray: '#A9A9A9', | |
| 283 | darkgreen: '#006400', | |
| 284 | darkgrey: '#A9A9A9', | |
| 285 | darkkhaki: '#BDB76B', | |
| 286 | darkmagenta: '#8B008B', | |
| 287 | darkolivegreen: '#556B2F', | |
| 288 | darkorange: '#FF8C00', | |
| 289 | darkorchid: '#9932CC', | |
| 290 | darkred: '#8B0000', | |
| 291 | darksalmon: '#E9967A', | |
| 292 | darkseagreen: '#8FBC8F', | |
| 293 | darkslateblue: '#483D8B', | |
| 294 | darkslategray: '#2F4F4F', | |
| 295 | darkslategrey: '#2F4F4F', | |
| 296 | darkturquoise: '#00CED1', | |
| 297 | darkviolet: '#9400D3', | |
| 298 | deeppink: '#FF1493', | |
| 299 | deepskyblue: '#00BFFF', | |
| 300 | dimgray: '#696969', | |
| 301 | dimgrey: '#696969', | |
| 302 | dodgerblue: '#1E90FF', | |
| 303 | firebrick: '#B22222', | |
| 304 | floralwhite: '#FFFAF0', | |
| 305 | forestgreen: '#228B22', | |
| 306 | gainsboro: '#DCDCDC', | |
| 307 | ghostwhite: '#F8F8FF', | |
| 308 | gold: '#FFD700', | |
| 309 | goldenrod: '#DAA520', | |
| 310 | grey: '#808080', | |
| 311 | greenyellow: '#ADFF2F', | |
| 312 | honeydew: '#F0FFF0', | |
| 313 | hotpink: '#FF69B4', | |
| 314 | indianred: '#CD5C5C', | |
| 315 | indigo: '#4B0082', | |
| 316 | ivory: '#FFFFF0', | |
| 317 | khaki: '#F0E68C', | |
| 318 | lavender: '#E6E6FA', | |
| 319 | lavenderblush: '#FFF0F5', | |
| 320 | lawngreen: '#7CFC00', | |
| 321 | lemonchiffon: '#FFFACD', | |
| 322 | lightblue: '#ADD8E6', | |
| 323 | lightcoral: '#F08080', | |
| 324 | lightcyan: '#E0FFFF', | |
| 325 | lightgoldenrodyellow: '#FAFAD2', | |
| 326 | lightgreen: '#90EE90', | |
| 327 | lightgrey: '#D3D3D3', | |
| 328 | lightpink: '#FFB6C1', | |
| 329 | lightsalmon: '#FFA07A', | |
| 330 | lightseagreen: '#20B2AA', | |
| 331 | lightskyblue: '#87CEFA', | |
| 332 | lightslategray: '#778899', | |
| 333 | lightslategrey: '#778899', | |
| 334 | lightsteelblue: '#B0C4DE', | |
| 335 | lightyellow: '#FFFFE0', | |
| 336 | limegreen: '#32CD32', | |
| 337 | linen: '#FAF0E6', | |
| 338 | magenta: '#FF00FF', | |
| 339 | mediumaquamarine: '#66CDAA', | |
| 340 | mediumblue: '#0000CD', | |
| 341 | mediumorchid: '#BA55D3', | |
| 342 | mediumpurple: '#9370DB', | |
| 343 | mediumseagreen: '#3CB371', | |
| 344 | mediumslateblue: '#7B68EE', | |
| 345 | mediumspringgreen: '#00FA9A', | |
| 346 | mediumturquoise: '#48D1CC', | |
| 347 | mediumvioletred: '#C71585', | |
| 348 | midnightblue: '#191970', | |
| 349 | mintcream: '#F5FFFA', | |
| 350 | mistyrose: '#FFE4E1', | |
| 351 | moccasin: '#FFE4B5', | |
| 352 | navajowhite: '#FFDEAD', | |
| 353 | oldlace: '#FDF5E6', | |
| 354 | olivedrab: '#6B8E23', | |
| 355 | orange: '#FFA500', | |
| 356 | orangered: '#FF4500', | |
| 357 | orchid: '#DA70D6', | |
| 358 | palegoldenrod: '#EEE8AA', | |
| 359 | palegreen: '#98FB98', | |
| 360 | paleturquoise: '#AFEEEE', | |
| 361 | palevioletred: '#DB7093', | |
| 362 | papayawhip: '#FFEFD5', | |
| 363 | peachpuff: '#FFDAB9', | |
| 364 | peru: '#CD853F', | |
| 365 | pink: '#FFC0CB', | |
| 366 | plum: '#DDA0DD', | |
| 367 | powderblue: '#B0E0E6', | |
| 368 | rosybrown: '#BC8F8F', | |
| 369 | royalblue: '#4169E1', | |
| 370 | saddlebrown: '#8B4513', | |
| 371 | salmon: '#FA8072', | |
| 372 | sandybrown: '#F4A460', | |
| 373 | seagreen: '#2E8B57', | |
| 374 | seashell: '#FFF5EE', | |
| 375 | sienna: '#A0522D', | |
| 376 | skyblue: '#87CEEB', | |
| 377 | slateblue: '#6A5ACD', | |
| 378 | slategray: '#708090', | |
| 379 | slategrey: '#708090', | |
| 380 | snow: '#FFFAFA', | |
| 381 | springgreen: '#00FF7F', | |
| 382 | steelblue: '#4682B4', | |
| 383 | tan: '#D2B48C', | |
| 384 | thistle: '#D8BFD8', | |
| 385 | tomato: '#FF6347', | |
| 386 | turquoise: '#40E0D0', | |
| 387 | violet: '#EE82EE', | |
| 388 | wheat: '#F5DEB3', | |
| 389 | whitesmoke: '#F5F5F5', | |
| 390 | yellowgreen: '#9ACD32' | |
| 391 | }; | |
| 392 | ||
| 393 | ||
| 394 | function getRgbHslContent(styleString) { | |
| 395 | var start = styleString.indexOf('(', 3); | |
| 396 | var end = styleString.indexOf(')', start + 1); | |
| 397 | var parts = styleString.substring(start + 1, end).split(','); | |
| 398 | // add alpha if needed | |
| 399 | if (parts.length != 4 || styleString.charAt(3) != 'a') { | |
| 400 | parts[3] = 1; | |
| 401 | } | |
| 402 | return parts; | |
| 403 | } | |
| 404 | ||
| 405 | function percent(s) { | |
| 406 | return parseFloat(s) / 100; | |
| 407 | } | |
| 408 | ||
| 409 | function clamp(v, min, max) { | |
| 410 | return Math.min(max, Math.max(min, v)); | |
| 411 | } | |
| 412 | ||
| 413 | function hslToRgb(parts){ | |
| 414 | var r, g, b, h, s, l; | |
| 415 | h = parseFloat(parts[0]) / 360 % 360; | |
| 416 | if (h < 0) | |
| 417 | h++; | |
| 418 | s = clamp(percent(parts[1]), 0, 1); | |
| 419 | l = clamp(percent(parts[2]), 0, 1); | |
| 420 | if (s == 0) { | |
| 421 | r = g = b = l; // achromatic | |
| 422 | } else { | |
| 423 | var q = l < 0.5 ? l * (1 + s) : l + s - l * s; | |
| 424 | var p = 2 * l - q; | |
| 425 | r = hueToRgb(p, q, h + 1 / 3); | |
| 426 | g = hueToRgb(p, q, h); | |
| 427 | b = hueToRgb(p, q, h - 1 / 3); | |
| 428 | } | |
| 429 | ||
| 430 | return '#' + decToHex[Math.floor(r * 255)] + | |
| 431 | decToHex[Math.floor(g * 255)] + | |
| 432 | decToHex[Math.floor(b * 255)]; | |
| 433 | } | |
| 434 | ||
| 435 | function hueToRgb(m1, m2, h) { | |
| 436 | if (h < 0) | |
| 437 | h++; | |
| 438 | if (h > 1) | |
| 439 | h--; | |
| 440 | ||
| 441 | if (6 * h < 1) | |
| 442 | return m1 + (m2 - m1) * 6 * h; | |
| 443 | else if (2 * h < 1) | |
| 444 | return m2; | |
| 445 | else if (3 * h < 2) | |
| 446 | return m1 + (m2 - m1) * (2 / 3 - h) * 6; | |
| 447 | else | |
| 448 | return m1; | |
| 449 | } | |
| 450 | ||
| 451 | var processStyleCache = {}; | |
| 452 | ||
| 453 | function processStyle(styleString) { | |
| 454 | if (styleString in processStyleCache) { | |
| 455 | return processStyleCache[styleString]; | |
| 456 | } | |
| 457 | ||
| 458 | var str, alpha = 1; | |
| 459 | ||
| 460 | styleString = String(styleString); | |
| 461 | if (styleString.charAt(0) == '#') { | |
| 462 | str = styleString; | |
| 463 | } else if (/^rgb/.test(styleString)) { | |
| 464 | var parts = getRgbHslContent(styleString); | |
| 465 | var str = '#', n; | |
| 466 | for (var i = 0; i < 3; i++) { | |
| 467 | if (parts[i].indexOf('%') != -1) { | |
| 468 | n = Math.floor(percent(parts[i]) * 255); | |
| 469 | } else { | |
| 470 | n = +parts[i]; | |
| 471 | } | |
| 472 | str += decToHex[clamp(n, 0, 255)]; | |
| 473 | } | |
| 474 | alpha = +parts[3]; | |
| 475 | } else if (/^hsl/.test(styleString)) { | |
| 476 | var parts = getRgbHslContent(styleString); | |
| 477 | str = hslToRgb(parts); | |
| 478 | alpha = parts[3]; | |
| 479 | } else { | |
| 480 | str = colorData[styleString] || styleString; | |
| 481 | } | |
| 482 | return processStyleCache[styleString] = {color: str, alpha: alpha}; | |
| 483 | } | |
| 484 | ||
| 485 | var DEFAULT_STYLE = { | |
| 486 | style: 'normal', | |
| 487 | variant: 'normal', | |
| 488 | weight: 'normal', | |
| 489 | size: 10, | |
| 490 | family: 'sans-serif' | |
| 491 | }; | |
| 492 | ||
| 493 | // Internal text style cache | |
| 494 | var fontStyleCache = {}; | |
| 495 | ||
| 496 | function processFontStyle(styleString) { | |
| 497 | if (fontStyleCache[styleString]) { | |
| 498 | return fontStyleCache[styleString]; | |
| 499 | } | |
| 500 | ||
| 501 | var el = document.createElement('div'); | |
| 502 | var style = el.style; | |
| 503 | try { | |
| 504 | style.font = styleString; | |
| 505 | } catch (ex) { | |
| 506 | // Ignore failures to set to invalid font. | |
| 507 | } | |
| 508 | ||
| 509 | return fontStyleCache[styleString] = { | |
| 510 | style: style.fontStyle || DEFAULT_STYLE.style, | |
| 511 | variant: style.fontVariant || DEFAULT_STYLE.variant, | |
| 512 | weight: style.fontWeight || DEFAULT_STYLE.weight, | |
| 513 | size: style.fontSize || DEFAULT_STYLE.size, | |
| 514 | family: style.fontFamily || DEFAULT_STYLE.family | |
| 515 | }; | |
| 516 | } | |
| 517 | ||
| 518 | function getComputedStyle(style, element) { | |
| 519 | var computedStyle = {}; | |
| 520 | ||
| 521 | for (var p in style) { | |
| 522 | computedStyle[p] = style[p]; | |
| 523 | } | |
| 524 | ||
| 525 | // Compute the size | |
| 526 | var canvasFontSize = parseFloat(element.currentStyle.fontSize), | |
| 527 | fontSize = parseFloat(style.size); | |
| 528 | ||
| 529 | if (typeof style.size == 'number') { | |
| 530 | computedStyle.size = style.size; | |
| 531 | } else if (style.size.indexOf('px') != -1) { | |
| 532 | computedStyle.size = fontSize; | |
| 533 | } else if (style.size.indexOf('em') != -1) { | |
| 534 | computedStyle.size = canvasFontSize * fontSize; | |
| 535 | } else if(style.size.indexOf('%') != -1) { | |
| 536 | computedStyle.size = (canvasFontSize / 100) * fontSize; | |
| 537 | } else if (style.size.indexOf('pt') != -1) { | |
| 538 | computedStyle.size = fontSize / .75; | |
| 539 | } else { | |
| 540 | computedStyle.size = canvasFontSize; | |
| 541 | } | |
| 542 | ||
| 543 | // Different scaling between normal text and VML text. This was found using | |
| 544 | // trial and error to get the same size as non VML text. | |
| 545 | computedStyle.size *= 0.981; | |
| 546 | ||
| 547 | return computedStyle; | |
| 548 | } | |
| 549 | ||
| 550 | function buildStyle(style) { | |
| 551 | return style.style + ' ' + style.variant + ' ' + style.weight + ' ' + | |
| 552 | style.size + 'px ' + style.family; | |
| 553 | } | |
| 554 | ||
| 555 | var lineCapMap = { | |
| 556 | 'butt': 'flat', | |
| 557 | 'round': 'round' | |
| 558 | }; | |
| 559 | ||
| 560 | function processLineCap(lineCap) { | |
| 561 | return lineCapMap[lineCap] || 'square'; | |
| 562 | } | |
| 563 | ||
| 564 | /** | |
| 565 | * This class implements CanvasRenderingContext2D interface as described by | |
| 566 | * the WHATWG. | |
| 567 | * @param {HTMLElement} canvasElement The element that the 2D context should | |
| 568 | * be associated with | |
| 569 | */ | |
| 570 | function CanvasRenderingContext2D_(canvasElement) { | |
| 571 | this.m_ = createMatrixIdentity(); | |
| 572 | ||
| 573 | this.mStack_ = []; | |
| 574 | this.aStack_ = []; | |
| 575 | this.currentPath_ = []; | |
| 576 | ||
| 577 | // Canvas context properties | |
| 578 | this.strokeStyle = '#000'; | |
| 579 | this.fillStyle = '#000'; | |
| 580 | ||
| 581 | this.lineWidth = 1; | |
| 582 | this.lineJoin = 'miter'; | |
| 583 | this.lineCap = 'butt'; | |
| 584 | this.miterLimit = Z * 1; | |
| 585 | this.globalAlpha = 1; | |
| 586 | this.font = '10px sans-serif'; | |
| 587 | this.textAlign = 'left'; | |
| 588 | this.textBaseline = 'alphabetic'; | |
| 589 | this.canvas = canvasElement; | |
| 590 | ||
| 591 | var cssText = 'width:' + canvasElement.clientWidth + 'px;height:' + | |
| 592 | canvasElement.clientHeight + 'px;overflow:hidden;position:absolute'; | |
| 593 | var el = canvasElement.ownerDocument.createElement('div'); | |
| 594 | el.style.cssText = cssText; | |
| 595 | canvasElement.appendChild(el); | |
| 596 | ||
| 597 | var overlayEl = el.cloneNode(false); | |
| 598 | // Use a non transparent background. | |
| 599 | overlayEl.style.backgroundColor = 'red'; | |
| 600 | overlayEl.style.filter = 'alpha(opacity=0)'; | |
| 601 | canvasElement.appendChild(overlayEl); | |
| 602 | ||
| 603 | this.element_ = el; | |
| 604 | this.arcScaleX_ = 1; | |
| 605 | this.arcScaleY_ = 1; | |
| 606 | this.lineScale_ = 1; | |
| 607 | } | |
| 608 | ||
| 609 | var contextPrototype = CanvasRenderingContext2D_.prototype; | |
| 610 | contextPrototype.clearRect = function() { | |
| 611 | if (this.textMeasureEl_) { | |
| 612 | this.textMeasureEl_.removeNode(true); | |
| 613 | this.textMeasureEl_ = null; | |
| 614 | } | |
| 615 | this.element_.innerHTML = ''; | |
| 616 | }; | |
| 617 | ||
| 618 | contextPrototype.beginPath = function() { | |
| 619 | // TODO: Branch current matrix so that save/restore has no effect | |
| 620 | // as per safari docs. | |
| 621 | this.currentPath_ = []; | |
| 622 | }; | |
| 623 | ||
| 624 | contextPrototype.moveTo = function(aX, aY) { | |
| 625 | var p = getCoords(this, aX, aY); | |
| 626 | this.currentPath_.push({type: 'moveTo', x: p.x, y: p.y}); | |
| 627 | this.currentX_ = p.x; | |
| 628 | this.currentY_ = p.y; | |
| 629 | }; | |
| 630 | ||
| 631 | contextPrototype.lineTo = function(aX, aY) { | |
| 632 | var p = getCoords(this, aX, aY); | |
| 633 | this.currentPath_.push({type: 'lineTo', x: p.x, y: p.y}); | |
| 634 | ||
| 635 | this.currentX_ = p.x; | |
| 636 | this.currentY_ = p.y; | |
| 637 | }; | |
| 638 | ||
| 639 | contextPrototype.bezierCurveTo = function(aCP1x, aCP1y, | |
| 640 | aCP2x, aCP2y, | |
| 641 | aX, aY) { | |
| 642 | var p = getCoords(this, aX, aY); | |
| 643 | var cp1 = getCoords(this, aCP1x, aCP1y); | |
| 644 | var cp2 = getCoords(this, aCP2x, aCP2y); | |
| 645 | bezierCurveTo(this, cp1, cp2, p); | |
| 646 | }; | |
| 647 | ||
| 648 | // Helper function that takes the already fixed cordinates. | |
| 649 | function bezierCurveTo(self, cp1, cp2, p) { | |
| 650 | self.currentPath_.push({ | |
| 651 | type: 'bezierCurveTo', | |
| 652 | cp1x: cp1.x, | |
| 653 | cp1y: cp1.y, | |
| 654 | cp2x: cp2.x, | |
| 655 | cp2y: cp2.y, | |
| 656 | x: p.x, | |
| 657 | y: p.y | |
| 658 | }); | |
| 659 | self.currentX_ = p.x; | |
| 660 | self.currentY_ = p.y; | |
| 661 | } | |
| 662 | ||
| 663 | contextPrototype.quadraticCurveTo = function(aCPx, aCPy, aX, aY) { | |
| 664 | // the following is lifted almost directly from | |
| 665 | // http://developer.mozilla.org/en/docs/Canvas_tutorial:Drawing_shapes | |
| 666 | ||
| 667 | var cp = getCoords(this, aCPx, aCPy); | |
| 668 | var p = getCoords(this, aX, aY); | |
| 669 | ||
| 670 | var cp1 = { | |
| 671 | x: this.currentX_ + 2.0 / 3.0 * (cp.x - this.currentX_), | |
| 672 | y: this.currentY_ + 2.0 / 3.0 * (cp.y - this.currentY_) | |
| 673 | }; | |
| 674 | var cp2 = { | |
| 675 | x: cp1.x + (p.x - this.currentX_) / 3.0, | |
| 676 | y: cp1.y + (p.y - this.currentY_) / 3.0 | |
| 677 | }; | |
| 678 | ||
| 679 | bezierCurveTo(this, cp1, cp2, p); | |
| 680 | }; | |
| 681 | ||
| 682 | contextPrototype.arc = function(aX, aY, aRadius, | |
| 683 | aStartAngle, aEndAngle, aClockwise) { | |
| 684 | aRadius *= Z; | |
| 685 | var arcType = aClockwise ? 'at' : 'wa'; | |
| 686 | ||
| 687 | var xStart = aX + mc(aStartAngle) * aRadius - Z2; | |
| 688 | var yStart = aY + ms(aStartAngle) * aRadius - Z2; | |
| 689 | ||
| 690 | var xEnd = aX + mc(aEndAngle) * aRadius - Z2; | |
| 691 | var yEnd = aY + ms(aEndAngle) * aRadius - Z2; | |
| 692 | ||
| 693 | // IE won't render arches drawn counter clockwise if xStart == xEnd. | |
| 694 | if (xStart == xEnd && !aClockwise) { | |
| 695 | xStart += 0.125; // Offset xStart by 1/80 of a pixel. Use something | |
| 696 | // that can be represented in binary | |
| 697 | } | |
| 698 | ||
| 699 | var p = getCoords(this, aX, aY); | |
| 700 | var pStart = getCoords(this, xStart, yStart); | |
| 701 | var pEnd = getCoords(this, xEnd, yEnd); | |
| 702 | ||
| 703 | this.currentPath_.push({type: arcType, | |
| 704 | x: p.x, | |
| 705 | y: p.y, | |
| 706 | radius: aRadius, | |
| 707 | xStart: pStart.x, | |
| 708 | yStart: pStart.y, | |
| 709 | xEnd: pEnd.x, | |
| 710 | yEnd: pEnd.y}); | |
| 711 | ||
| 712 | }; | |
| 713 | ||
| 714 | contextPrototype.rect = function(aX, aY, aWidth, aHeight) { | |
| 715 | this.moveTo(aX, aY); | |
| 716 | this.lineTo(aX + aWidth, aY); | |
| 717 | this.lineTo(aX + aWidth, aY + aHeight); | |
| 718 | this.lineTo(aX, aY + aHeight); | |
| 719 | this.closePath(); | |
| 720 | }; | |
| 721 | ||
| 722 | contextPrototype.strokeRect = function(aX, aY, aWidth, aHeight) { | |
| 723 | var oldPath = this.currentPath_; | |
| 724 | this.beginPath(); | |
| 725 | ||
| 726 | this.moveTo(aX, aY); | |
| 727 | this.lineTo(aX + aWidth, aY); | |
| 728 | this.lineTo(aX + aWidth, aY + aHeight); | |
| 729 | this.lineTo(aX, aY + aHeight); | |
| 730 | this.closePath(); | |
| 731 | this.stroke(); | |
| 732 | ||
| 733 | this.currentPath_ = oldPath; | |
| 734 | }; | |
| 735 | ||
| 736 | contextPrototype.fillRect = function(aX, aY, aWidth, aHeight) { | |
| 737 | var oldPath = this.currentPath_; | |
| 738 | this.beginPath(); | |
| 739 | ||
| 740 | this.moveTo(aX, aY); | |
| 741 | this.lineTo(aX + aWidth, aY); | |
| 742 | this.lineTo(aX + aWidth, aY + aHeight); | |
| 743 | this.lineTo(aX, aY + aHeight); | |
| 744 | this.closePath(); | |
| 745 | this.fill(); | |
| 746 | ||
| 747 | this.currentPath_ = oldPath; | |
| 748 | }; | |
| 749 | ||
| 750 | contextPrototype.createLinearGradient = function(aX0, aY0, aX1, aY1) { | |
| 751 | var gradient = new CanvasGradient_('gradient'); | |
| 752 | gradient.x0_ = aX0; | |
| 753 | gradient.y0_ = aY0; | |
| 754 | gradient.x1_ = aX1; | |
| 755 | gradient.y1_ = aY1; | |
| 756 | return gradient; | |
| 757 | }; | |
| 758 | ||
| 759 | contextPrototype.createRadialGradient = function(aX0, aY0, aR0, | |
| 760 | aX1, aY1, aR1) { | |
| 761 | var gradient = new CanvasGradient_('gradientradial'); | |
| 762 | gradient.x0_ = aX0; | |
| 763 | gradient.y0_ = aY0; | |
| 764 | gradient.r0_ = aR0; | |
| 765 | gradient.x1_ = aX1; | |
| 766 | gradient.y1_ = aY1; | |
| 767 | gradient.r1_ = aR1; | |
| 768 | return gradient; | |
| 769 | }; | |
| 770 | ||
| 771 | contextPrototype.drawImage = function(image, var_args) { | |
| 772 | var dx, dy, dw, dh, sx, sy, sw, sh; | |
| 773 | ||
| 774 | // to find the original width we overide the width and height | |
| 775 | var oldRuntimeWidth = image.runtimeStyle.width; | |
| 776 | var oldRuntimeHeight = image.runtimeStyle.height; | |
| 777 | image.runtimeStyle.width = 'auto'; | |
| 778 | image.runtimeStyle.height = 'auto'; | |
| 779 | ||
| 780 | // get the original size | |
| 781 | var w = image.width; | |
| 782 | var h = image.height; | |
| 783 | ||
| 784 | // and remove overides | |
| 785 | image.runtimeStyle.width = oldRuntimeWidth; | |
| 786 | image.runtimeStyle.height = oldRuntimeHeight; | |
| 787 | ||
| 788 | if (arguments.length == 3) { | |
| 789 | dx = arguments[1]; | |
| 790 | dy = arguments[2]; | |
| 791 | sx = sy = 0; | |
| 792 | sw = dw = w; | |
| 793 | sh = dh = h; | |
| 794 | } else if (arguments.length == 5) { | |
| 795 | dx = arguments[1]; | |
| 796 | dy = arguments[2]; | |
| 797 | dw = arguments[3]; | |
| 798 | dh = arguments[4]; | |
| 799 | sx = sy = 0; | |
| 800 | sw = w; | |
| 801 | sh = h; | |
| 802 | } else if (arguments.length == 9) { | |
| 803 | sx = arguments[1]; | |
| 804 | sy = arguments[2]; | |
| 805 | sw = arguments[3]; | |
| 806 | sh = arguments[4]; | |
| 807 | dx = arguments[5]; | |
| 808 | dy = arguments[6]; | |
| 809 | dw = arguments[7]; | |
| 810 | dh = arguments[8]; | |
| 811 | } else { | |
| 812 | throw Error('Invalid number of arguments'); | |
| 813 | } | |
| 814 | ||
| 815 | var d = getCoords(this, dx, dy); | |
| 816 | ||
| 817 | var w2 = sw / 2; | |
| 818 | var h2 = sh / 2; | |
| 819 | ||
| 820 | var vmlStr = []; | |
| 821 | ||
| 822 | var W = 10; | |
| 823 | var H = 10; | |
| 824 | ||
| 825 | // For some reason that I've now forgotten, using divs didn't work | |
| 826 | vmlStr.push(' <g_vml_:group', | |
| 827 | ' coordsize="', Z * W, ',', Z * H, '"', | |
| 828 | ' coordorigin="0,0"' , | |
| 829 | ' style="width:', W, 'px;height:', H, 'px;position:absolute;'); | |
| 830 | ||
| 831 | // If filters are necessary (rotation exists), create them | |
| 832 | // filters are bog-slow, so only create them if abbsolutely necessary | |
| 833 | // The following check doesn't account for skews (which don't exist | |
| 834 | // in the canvas spec (yet) anyway. | |
| 835 | ||
| 836 | if (this.m_[0][0] != 1 || this.m_[0][1] || | |
| 837 | this.m_[1][1] != 1 || this.m_[1][0]) { | |
| 838 | var filter = []; | |
| 839 | ||
| 840 | // Note the 12/21 reversal | |
| 841 | filter.push('M11=', this.m_[0][0], ',', | |
| 842 | 'M12=', this.m_[1][0], ',', | |
| 843 | 'M21=', this.m_[0][1], ',', | |
| 844 | 'M22=', this.m_[1][1], ',', | |
| 845 | 'Dx=', mr(d.x / Z), ',', | |
| 846 | 'Dy=', mr(d.y / Z), ''); | |
| 847 | ||
| 848 | // Bounding box calculation (need to minimize displayed area so that | |
| 849 | // filters don't waste time on unused pixels. | |
| 850 | var max = d; | |
| 851 | var c2 = getCoords(this, dx + dw, dy); | |
| 852 | var c3 = getCoords(this, dx, dy + dh); | |
| 853 | var c4 = getCoords(this, dx + dw, dy + dh); | |
| 854 | ||
| 855 | max.x = m.max(max.x, c2.x, c3.x, c4.x); | |
| 856 | max.y = m.max(max.y, c2.y, c3.y, c4.y); | |
| 857 | ||
| 858 | vmlStr.push('padding:0 ', mr(max.x / Z), 'px ', mr(max.y / Z), | |
| 859 | 'px 0;filter:progid:DXImageTransform.Microsoft.Matrix(', | |
| 860 | filter.join(''), ", sizingmethod='clip');"); | |
| 861 | ||
| 862 | } else { | |
| 863 | vmlStr.push('top:', mr(d.y / Z), 'px;left:', mr(d.x / Z), 'px;'); | |
| 864 | } | |
| 865 | ||
| 866 | vmlStr.push(' ">' , | |
| 867 | '<g_vml_:image src="', image.src, '"', | |
| 868 | ' style="width:', Z * dw, 'px;', | |
| 869 | ' height:', Z * dh, 'px"', | |
| 870 | ' cropleft="', sx / w, '"', | |
| 871 | ' croptop="', sy / h, '"', | |
| 872 | ' cropright="', (w - sx - sw) / w, '"', | |
| 873 | ' cropbottom="', (h - sy - sh) / h, '"', | |
| 874 | ' />', | |
| 875 | '</g_vml_:group>'); | |
| 876 | ||
| 877 | this.element_.insertAdjacentHTML('BeforeEnd', vmlStr.join('')); | |
| 878 | }; | |
| 879 | ||
| 880 | contextPrototype.stroke = function(aFill) { | |
| 881 | var W = 10; | |
| 882 | var H = 10; | |
| 883 | // Divide the shape into chunks if it's too long because IE has a limit | |
| 884 | // somewhere for how long a VML shape can be. This simple division does | |
| 885 | // not work with fills, only strokes, unfortunately. | |
| 886 | var chunkSize = 5000; | |
| 887 | ||
| 888 | var min = {x: null, y: null}; | |
| 889 | var max = {x: null, y: null}; | |
| 890 | ||
| 891 | for (var j = 0; j < this.currentPath_.length; j += chunkSize) { | |
| 892 | var lineStr = []; | |
| 893 | var lineOpen = false; | |
| 894 | ||
| 895 | lineStr.push('<g_vml_:shape', | |
| 896 | ' filled="', !!aFill, '"', | |
| 897 | ' style="position:absolute;width:', W, 'px;height:', H, 'px;"', | |
| 898 | ' coordorigin="0,0"', | |
| 899 | ' coordsize="', Z * W, ',', Z * H, '"', | |
| 900 | ' stroked="', !aFill, '"', | |
| 901 | ' path="'); | |
| 902 | ||
| 903 | var newSeq = false; | |
| 904 | ||
| 905 | for (var i = j; i < Math.min(j + chunkSize, this.currentPath_.length); i++) { | |
| 906 | if (i % chunkSize == 0 && i > 0) { // move into position for next chunk | |
| 907 | lineStr.push(' m ', mr(this.currentPath_[i-1].x), ',', mr(this.currentPath_[i-1].y)); | |
| 908 | } | |
| 909 | ||
| 910 | var p = this.currentPath_[i]; | |
| 911 | var c; | |
| 912 | ||
| 913 | switch (p.type) { | |
| 914 | case 'moveTo': | |
| 915 | c = p; | |
| 916 | lineStr.push(' m ', mr(p.x), ',', mr(p.y)); | |
| 917 | break; | |
| 918 | case 'lineTo': | |
| 919 | lineStr.push(' l ', mr(p.x), ',', mr(p.y)); | |
| 920 | break; | |
| 921 | case 'close': | |
| 922 | lineStr.push(' x '); | |
| 923 | p = null; | |
| 924 | break; | |
| 925 | case 'bezierCurveTo': | |
| 926 | lineStr.push(' c ', | |
| 927 | mr(p.cp1x), ',', mr(p.cp1y), ',', | |
| 928 | mr(p.cp2x), ',', mr(p.cp2y), ',', | |
| 929 | mr(p.x), ',', mr(p.y)); | |
| 930 | break; | |
| 931 | case 'at': | |
| 932 | case 'wa': | |
| 933 | lineStr.push(' ', p.type, ' ', | |
| 934 | mr(p.x - this.arcScaleX_ * p.radius), ',', | |
| 935 | mr(p.y - this.arcScaleY_ * p.radius), ' ', | |
| 936 | mr(p.x + this.arcScaleX_ * p.radius), ',', | |
| 937 | mr(p.y + this.arcScaleY_ * p.radius), ' ', | |
| 938 | mr(p.xStart), ',', mr(p.yStart), ' ', | |
| 939 | mr(p.xEnd), ',', mr(p.yEnd)); | |
| 940 | break; | |
| 941 | } | |
| 942 | ||
| 943 | ||
| 944 | // TODO: Following is broken for curves due to | |
| 945 | // move to proper paths. | |
| 946 | ||
| 947 | // Figure out dimensions so we can do gradient fills | |
| 948 | // properly | |
| 949 | if (p) { | |
| 950 | if (min.x == null || p.x < min.x) { | |
| 951 | min.x = p.x; | |
| 952 | } | |
| 953 | if (max.x == null || p.x > max.x) { | |
| 954 | max.x = p.x; | |
| 955 | } | |
| 956 | if (min.y == null || p.y < min.y) { | |
| 957 | min.y = p.y; | |
| 958 | } | |
| 959 | if (max.y == null || p.y > max.y) { | |
| 960 | max.y = p.y; | |
| 961 | } | |
| 962 | } | |
| 963 | } | |
| 964 | lineStr.push(' ">'); | |
| 965 | ||
| 966 | if (!aFill) { | |
| 967 | appendStroke(this, lineStr); | |
| 968 | } else { | |
| 969 | appendFill(this, lineStr, min, max); | |
| 970 | } | |
| 971 | ||
| 972 | lineStr.push('</g_vml_:shape>'); | |
| 973 | ||
| 974 | this.element_.insertAdjacentHTML('beforeEnd', lineStr.join('')); | |
| 975 | } | |
| 976 | }; | |
| 977 | ||
| 978 | function appendStroke(ctx, lineStr) { | |
| 979 | var a = processStyle(ctx.strokeStyle); | |
| 980 | var color = a.color; | |
| 981 | var opacity = a.alpha * ctx.globalAlpha; | |
| 982 | var lineWidth = ctx.lineScale_ * ctx.lineWidth; | |
| 983 | ||
| 984 | // VML cannot correctly render a line if the width is less than 1px. | |
| 985 | // In that case, we dilute the color to make the line look thinner. | |
| 986 | if (lineWidth < 1) { | |
| 987 | opacity *= lineWidth; | |
| 988 | } | |
| 989 | ||
| 990 | lineStr.push( | |
| 991 | '<g_vml_:stroke', | |
| 992 | ' opacity="', opacity, '"', | |
| 993 | ' joinstyle="', ctx.lineJoin, '"', | |
| 994 | ' miterlimit="', ctx.miterLimit, '"', | |
| 995 | ' endcap="', processLineCap(ctx.lineCap), '"', | |
| 996 | ' weight="', lineWidth, 'px"', | |
| 997 | ' color="', color, '" />' | |
| 998 | ); | |
| 999 | } | |
| 1000 | ||
| 1001 | function appendFill(ctx, lineStr, min, max) { | |
| 1002 | var fillStyle = ctx.fillStyle; | |
| 1003 | var arcScaleX = ctx.arcScaleX_; | |
| 1004 | var arcScaleY = ctx.arcScaleY_; | |
| 1005 | var width = max.x - min.x; | |
| 1006 | var height = max.y - min.y; | |
| 1007 | if (fillStyle instanceof CanvasGradient_) { | |
| 1008 | // TODO: Gradients transformed with the transformation matrix. | |
| 1009 | var angle = 0; | |
| 1010 | var focus = {x: 0, y: 0}; | |
| 1011 | ||
| 1012 | // additional offset | |
| 1013 | var shift = 0; | |
| 1014 | // scale factor for offset | |
| 1015 | var expansion = 1; | |
| 1016 | ||
| 1017 | if (fillStyle.type_ == 'gradient') { | |
| 1018 | var x0 = fillStyle.x0_ / arcScaleX; | |
| 1019 | var y0 = fillStyle.y0_ / arcScaleY; | |
| 1020 | var x1 = fillStyle.x1_ / arcScaleX; | |
| 1021 | var y1 = fillStyle.y1_ / arcScaleY; | |
| 1022 | var p0 = getCoords(ctx, x0, y0); | |
| 1023 | var p1 = getCoords(ctx, x1, y1); | |
| 1024 | var dx = p1.x - p0.x; | |
| 1025 | var dy = p1.y - p0.y; | |
| 1026 | angle = Math.atan2(dx, dy) * 180 / Math.PI; | |
| 1027 | ||
| 1028 | // The angle should be a non-negative number. | |
| 1029 | if (angle < 0) { | |
| 1030 | angle += 360; | |
| 1031 | } | |
| 1032 | ||
| 1033 | // Very small angles produce an unexpected result because they are | |
| 1034 | // converted to a scientific notation string. | |
| 1035 | if (angle < 1e-6) { | |
| 1036 | angle = 0; | |
| 1037 | } | |
| 1038 | } else { | |
| 1039 | var p0 = getCoords(ctx, fillStyle.x0_, fillStyle.y0_); | |
| 1040 | focus = { | |
| 1041 | x: (p0.x - min.x) / width, | |
| 1042 | y: (p0.y - min.y) / height | |
| 1043 | }; | |
| 1044 | ||
| 1045 | width /= arcScaleX * Z; | |
| 1046 | height /= arcScaleY * Z; | |
| 1047 | var dimension = m.max(width, height); | |
| 1048 | shift = 2 * fillStyle.r0_ / dimension; | |
| 1049 | expansion = 2 * fillStyle.r1_ / dimension - shift; | |
| 1050 | } | |
| 1051 | ||
| 1052 | // We need to sort the color stops in ascending order by offset, | |
| 1053 | // otherwise IE won't interpret it correctly. | |
| 1054 | var stops = fillStyle.colors_; | |
| 1055 | stops.sort(function(cs1, cs2) { | |
| 1056 | return cs1.offset - cs2.offset; | |
| 1057 | }); | |
| 1058 | ||
| 1059 | var length = stops.length; | |
| 1060 | var color1 = stops[0].color; | |
| 1061 | var color2 = stops[length - 1].color; | |
| 1062 | var opacity1 = stops[0].alpha * ctx.globalAlpha; | |
| 1063 | var opacity2 = stops[length - 1].alpha * ctx.globalAlpha; | |
| 1064 | ||
| 1065 | var colors = []; | |
| 1066 | for (var i = 0; i < length; i++) { | |
| 1067 | var stop = stops[i]; | |
| 1068 | colors.push(stop.offset * expansion + shift + ' ' + stop.color); | |
| 1069 | } | |
| 1070 | ||
| 1071 | // When colors attribute is used, the meanings of opacity and o:opacity2 | |
| 1072 | // are reversed. | |
| 1073 | lineStr.push('<g_vml_:fill type="', fillStyle.type_, '"', | |
| 1074 | ' method="none" focus="100%"', | |
| 1075 | ' color="', color1, '"', | |
| 1076 | ' color2="', color2, '"', | |
| 1077 | ' colors="', colors.join(','), '"', | |
| 1078 | ' opacity="', opacity2, '"', | |
| 1079 | ' g_o_:opacity2="', opacity1, '"', | |
| 1080 | ' angle="', angle, '"', | |
| 1081 | ' focusposition="', focus.x, ',', focus.y, '" />'); | |
| 1082 | } else if (fillStyle instanceof CanvasPattern_) { | |
| 1083 | if (width && height) { | |
| 1084 | var deltaLeft = -min.x; | |
| 1085 | var deltaTop = -min.y; | |
| 1086 | lineStr.push('<g_vml_:fill', | |
| 1087 | ' position="', | |
| 1088 | deltaLeft / width * arcScaleX * arcScaleX, ',', | |
| 1089 | deltaTop / height * arcScaleY * arcScaleY, '"', | |
| 1090 | ' type="tile"', | |
| 1091 | // TODO: Figure out the correct size to fit the scale. | |
| 1092 | //' size="', w, 'px ', h, 'px"', | |
| 1093 | ' src="', fillStyle.src_, '" />'); | |
| 1094 | } | |
| 1095 | } else { | |
| 1096 | var a = processStyle(ctx.fillStyle); | |
| 1097 | var color = a.color; | |
| 1098 | var opacity = a.alpha * ctx.globalAlpha; | |
| 1099 | lineStr.push('<g_vml_:fill color="', color, '" opacity="', opacity, | |
| 1100 | '" />'); | |
| 1101 | } | |
| 1102 | } | |
| 1103 | ||
| 1104 | contextPrototype.fill = function() { | |
| 1105 | this.stroke(true); | |
| 1106 | }; | |
| 1107 | ||
| 1108 | contextPrototype.closePath = function() { | |
| 1109 | this.currentPath_.push({type: 'close'}); | |
| 1110 | }; | |
| 1111 | ||
| 1112 | function getCoords(ctx, aX, aY) { | |
| 1113 | var m = ctx.m_; | |
| 1114 | return { | |
| 1115 | x: Z * (aX * m[0][0] + aY * m[1][0] + m[2][0]) - Z2, | |
| 1116 | y: Z * (aX * m[0][1] + aY * m[1][1] + m[2][1]) - Z2 | |
| 1117 | }; | |
| 1118 | }; | |
| 1119 | ||
| 1120 | contextPrototype.save = function() { | |
| 1121 | var o = {}; | |
| 1122 | copyState(this, o); | |
| 1123 | this.aStack_.push(o); | |
| 1124 | this.mStack_.push(this.m_); | |
| 1125 | this.m_ = matrixMultiply(createMatrixIdentity(), this.m_); | |
| 1126 | }; | |
| 1127 | ||
| 1128 | contextPrototype.restore = function() { | |
| 1129 | if (this.aStack_.length) { | |
| 1130 | copyState(this.aStack_.pop(), this); | |
| 1131 | this.m_ = this.mStack_.pop(); | |
| 1132 | } | |
| 1133 | }; | |
| 1134 | ||
| 1135 | function matrixIsFinite(m) { | |
| 1136 | return isFinite(m[0][0]) && isFinite(m[0][1]) && | |
| 1137 | isFinite(m[1][0]) && isFinite(m[1][1]) && | |
| 1138 | isFinite(m[2][0]) && isFinite(m[2][1]); | |
| 1139 | } | |
| 1140 | ||
| 1141 | function setM(ctx, m, updateLineScale) { | |
| 1142 | if (!matrixIsFinite(m)) { | |
| 1143 | return; | |
| 1144 | } | |
| 1145 | ctx.m_ = m; | |
| 1146 | ||
| 1147 | if (updateLineScale) { | |
| 1148 | // Get the line scale. | |
| 1149 | // Determinant of this.m_ means how much the area is enlarged by the | |
| 1150 | // transformation. So its square root can be used as a scale factor | |
| 1151 | // for width. | |
| 1152 | var det = m[0][0] * m[1][1] - m[0][1] * m[1][0]; | |
| 1153 | ctx.lineScale_ = sqrt(abs(det)); | |
| 1154 | } | |
| 1155 | } | |
| 1156 | ||
| 1157 | contextPrototype.translate = function(aX, aY) { | |
| 1158 | var m1 = [ | |
| 1159 | [1, 0, 0], | |
| 1160 | [0, 1, 0], | |
| 1161 | [aX, aY, 1] | |
| 1162 | ]; | |
| 1163 | ||
| 1164 | setM(this, matrixMultiply(m1, this.m_), false); | |
| 1165 | }; | |
| 1166 | ||
| 1167 | contextPrototype.rotate = function(aRot) { | |
| 1168 | var c = mc(aRot); | |
| 1169 | var s = ms(aRot); | |
| 1170 | ||
| 1171 | var m1 = [ | |
| 1172 | [c, s, 0], | |
| 1173 | [-s, c, 0], | |
| 1174 | [0, 0, 1] | |
| 1175 | ]; | |
| 1176 | ||
| 1177 | setM(this, matrixMultiply(m1, this.m_), false); | |
| 1178 | }; | |
| 1179 | ||
| 1180 | contextPrototype.scale = function(aX, aY) { | |
| 1181 | this.arcScaleX_ *= aX; | |
| 1182 | this.arcScaleY_ *= aY; | |
| 1183 | var m1 = [ | |
| 1184 | [aX, 0, 0], | |
| 1185 | [0, aY, 0], | |
| 1186 | [0, 0, 1] | |
| 1187 | ]; | |
| 1188 | ||
| 1189 | setM(this, matrixMultiply(m1, this.m_), true); | |
| 1190 | }; | |
| 1191 | ||
| 1192 | contextPrototype.transform = function(m11, m12, m21, m22, dx, dy) { | |
| 1193 | var m1 = [ | |
| 1194 | [m11, m12, 0], | |
| 1195 | [m21, m22, 0], | |
| 1196 | [dx, dy, 1] | |
| 1197 | ]; | |
| 1198 | ||
| 1199 | setM(this, matrixMultiply(m1, this.m_), true); | |
| 1200 | }; | |
| 1201 | ||
| 1202 | contextPrototype.setTransform = function(m11, m12, m21, m22, dx, dy) { | |
| 1203 | var m = [ | |
| 1204 | [m11, m12, 0], | |
| 1205 | [m21, m22, 0], | |
| 1206 | [dx, dy, 1] | |
| 1207 | ]; | |
| 1208 | ||
| 1209 | setM(this, m, true); | |
| 1210 | }; | |
| 1211 | ||
| 1212 | /** | |
| 1213 | * The text drawing function. | |
| 1214 | * The maxWidth argument isn't taken in account, since no browser supports | |
| 1215 | * it yet. | |
| 1216 | */ | |
| 1217 | contextPrototype.drawText_ = function(text, x, y, maxWidth, stroke) { | |
| 1218 | var m = this.m_, | |
| 1219 | delta = 1000, | |
| 1220 | left = 0, | |
| 1221 | right = delta, | |
| 1222 | offset = {x: 0, y: 0}, | |
| 1223 | lineStr = []; | |
| 1224 | ||
| 1225 | var fontStyle = getComputedStyle(processFontStyle(this.font), | |
| 1226 | this.element_); | |
| 1227 | ||
| 1228 | var fontStyleString = buildStyle(fontStyle); | |
| 1229 | ||
| 1230 | var elementStyle = this.element_.currentStyle; | |
| 1231 | var textAlign = this.textAlign.toLowerCase(); | |
| 1232 | switch (textAlign) { | |
| 1233 | case 'left': | |
| 1234 | case 'center': | |
| 1235 | case 'right': | |
| 1236 | break; | |
| 1237 | case 'end': | |
| 1238 | textAlign = elementStyle.direction == 'ltr' ? 'right' : 'left'; | |
| 1239 | break; | |
| 1240 | case 'start': | |
| 1241 | textAlign = elementStyle.direction == 'rtl' ? 'right' : 'left'; | |
| 1242 | break; | |
| 1243 | default: | |
| 1244 | textAlign = 'left'; | |
| 1245 | } | |
| 1246 | ||
| 1247 | // 1.75 is an arbitrary number, as there is no info about the text baseline | |
| 1248 | switch (this.textBaseline) { | |
| 1249 | case 'hanging': | |
| 1250 | case 'top': | |
| 1251 | offset.y = fontStyle.size / 1.75; | |
| 1252 | break; | |
| 1253 | case 'middle': | |
| 1254 | break; | |
| 1255 | default: | |
| 1256 | case null: | |
| 1257 | case 'alphabetic': | |
| 1258 | case 'ideographic': | |
| 1259 | case 'bottom': | |
| 1260 | offset.y = -fontStyle.size / 2.25; | |
| 1261 | break; | |
| 1262 | } | |
| 1263 | ||
| 1264 | switch(textAlign) { | |
| 1265 | case 'right': | |
| 1266 | left = delta; | |
| 1267 | right = 0.05; | |
| 1268 | break; | |
| 1269 | case 'center': | |
| 1270 | left = right = delta / 2; | |
| 1271 | break; | |
| 1272 | } | |
| 1273 | ||
| 1274 | var d = getCoords(this, x + offset.x, y + offset.y); | |
| 1275 | ||
| 1276 | lineStr.push('<g_vml_:line from="', -left ,' 0" to="', right ,' 0.05" ', | |
| 1277 | ' coordsize="100 100" coordorigin="0 0"', | |
| 1278 | ' filled="', !stroke, '" stroked="', !!stroke, | |
| 1279 | '" style="position:absolute;width:1px;height:1px;">'); | |
| 1280 | ||
| 1281 | if (stroke) { | |
| 1282 | appendStroke(this, lineStr); | |
| 1283 | } else { | |
| 1284 | // TODO: Fix the min and max params. | |
| 1285 | appendFill(this, lineStr, {x: -left, y: 0}, | |
| 1286 | {x: right, y: fontStyle.size}); | |
| 1287 | } | |
| 1288 | ||
| 1289 | var skewM = m[0][0].toFixed(3) + ',' + m[1][0].toFixed(3) + ',' + | |
| 1290 | m[0][1].toFixed(3) + ',' + m[1][1].toFixed(3) + ',0,0'; | |
| 1291 | ||
| 1292 | var skewOffset = mr(d.x / Z) + ',' + mr(d.y / Z); | |
| 1293 | ||
| 1294 | lineStr.push('<g_vml_:skew on="t" matrix="', skewM ,'" ', | |
| 1295 | ' offset="', skewOffset, '" origin="', left ,' 0" />', | |
| 1296 | '<g_vml_:path textpathok="true" />', | |
| 1297 | '<g_vml_:textpath on="true" string="', | |
| 1298 | encodeHtmlAttribute(text), | |
| 1299 | '" style="v-text-align:', textAlign, | |
| 1300 | ';font:', encodeHtmlAttribute(fontStyleString), | |
| 1301 | '" /></g_vml_:line>'); | |
| 1302 | ||
| 1303 | this.element_.insertAdjacentHTML('beforeEnd', lineStr.join('')); | |
| 1304 | }; | |
| 1305 | ||
| 1306 | contextPrototype.fillText = function(text, x, y, maxWidth) { | |
| 1307 | this.drawText_(text, x, y, maxWidth, false); | |
| 1308 | }; | |
| 1309 | ||
| 1310 | contextPrototype.strokeText = function(text, x, y, maxWidth) { | |
| 1311 | this.drawText_(text, x, y, maxWidth, true); | |
| 1312 | }; | |
| 1313 | ||
| 1314 | contextPrototype.measureText = function(text) { | |
| 1315 | if (!this.textMeasureEl_) { | |
| 1316 | var s = '<span style="position:absolute;' + | |
| 1317 | 'top:-20000px;left:0;padding:0;margin:0;border:none;' + | |
| 1318 | 'white-space:pre;"></span>'; | |
| 1319 | this.element_.insertAdjacentHTML('beforeEnd', s); | |
| 1320 | this.textMeasureEl_ = this.element_.lastChild; | |
| 1321 | } | |
| 1322 | var doc = this.element_.ownerDocument; | |
| 1323 | this.textMeasureEl_.innerHTML = ''; | |
| 1324 | this.textMeasureEl_.style.font = this.font; | |
| 1325 | // Don't use innerHTML or innerText because they allow markup/whitespace. | |
| 1326 | this.textMeasureEl_.appendChild(doc.createTextNode(text)); | |
| 1327 | return {width: this.textMeasureEl_.offsetWidth}; | |
| 1328 | }; | |
| 1329 | ||
| 1330 | /******** STUBS ********/ | |
| 1331 | contextPrototype.clip = function() { | |
| 1332 | // TODO: Implement | |
| 1333 | }; | |
| 1334 | ||
| 1335 | contextPrototype.arcTo = function() { | |
| 1336 | // TODO: Implement | |
| 1337 | }; | |
| 1338 | ||
| 1339 | contextPrototype.createPattern = function(image, repetition) { | |
| 1340 | return new CanvasPattern_(image, repetition); | |
| 1341 | }; | |
| 1342 | ||
| 1343 | // Gradient / Pattern Stubs | |
| 1344 | function CanvasGradient_(aType) { | |
| 1345 | this.type_ = aType; | |
| 1346 | this.x0_ = 0; | |
| 1347 | this.y0_ = 0; | |
| 1348 | this.r0_ = 0; | |
| 1349 | this.x1_ = 0; | |
| 1350 | this.y1_ = 0; | |
| 1351 | this.r1_ = 0; | |
| 1352 | this.colors_ = []; | |
| 1353 | } | |
| 1354 | ||
| 1355 | CanvasGradient_.prototype.addColorStop = function(aOffset, aColor) { | |
| 1356 | aColor = processStyle(aColor); | |
| 1357 | this.colors_.push({offset: aOffset, | |
| 1358 | color: aColor.color, | |
| 1359 | alpha: aColor.alpha}); | |
| 1360 | }; | |
| 1361 | ||
| 1362 | function CanvasPattern_(image, repetition) { | |
| 1363 | assertImageIsValid(image); | |
| 1364 | switch (repetition) { | |
| 1365 | case 'repeat': | |
| 1366 | case null: | |
| 1367 | case '': | |
| 1368 | this.repetition_ = 'repeat'; | |
| 1369 | break | |
| 1370 | case 'repeat-x': | |
| 1371 | case 'repeat-y': | |
| 1372 | case 'no-repeat': | |
| 1373 | this.repetition_ = repetition; | |
| 1374 | break; | |
| 1375 | default: | |
| 1376 | throwException('SYNTAX_ERR'); | |
| 1377 | } | |
| 1378 | ||
| 1379 | this.src_ = image.src; | |
| 1380 | this.width_ = image.width; | |
| 1381 | this.height_ = image.height; | |
| 1382 | } | |
| 1383 | ||
| 1384 | function throwException(s) { | |
| 1385 | throw new DOMException_(s); | |
| 1386 | } | |
| 1387 | ||
| 1388 | function assertImageIsValid(img) { | |
| 1389 | if (!img || img.nodeType != 1 || img.tagName != 'IMG') { | |
| 1390 | throwException('TYPE_MISMATCH_ERR'); | |
| 1391 | } | |
| 1392 | if (img.readyState != 'complete') { | |
| 1393 | throwException('INVALID_STATE_ERR'); | |
| 1394 | } | |
| 1395 | } | |
| 1396 | ||
| 1397 | function DOMException_(s) { | |
| 1398 | this.code = this[s]; | |
| 1399 | this.message = s +': DOM Exception ' + this.code; | |
| 1400 | } | |
| 1401 | var p = DOMException_.prototype = new Error; | |
| 1402 | p.INDEX_SIZE_ERR = 1; | |
| 1403 | p.DOMSTRING_SIZE_ERR = 2; | |
| 1404 | p.HIERARCHY_REQUEST_ERR = 3; | |
| 1405 | p.WRONG_DOCUMENT_ERR = 4; | |
| 1406 | p.INVALID_CHARACTER_ERR = 5; | |
| 1407 | p.NO_DATA_ALLOWED_ERR = 6; | |
| 1408 | p.NO_MODIFICATION_ALLOWED_ERR = 7; | |
| 1409 | p.NOT_FOUND_ERR = 8; | |
| 1410 | p.NOT_SUPPORTED_ERR = 9; | |
| 1411 | p.INUSE_ATTRIBUTE_ERR = 10; | |
| 1412 | p.INVALID_STATE_ERR = 11; | |
| 1413 | p.SYNTAX_ERR = 12; | |
| 1414 | p.INVALID_MODIFICATION_ERR = 13; | |
| 1415 | p.NAMESPACE_ERR = 14; | |
| 1416 | p.INVALID_ACCESS_ERR = 15; | |
| 1417 | p.VALIDATION_ERR = 16; | |
| 1418 | p.TYPE_MISMATCH_ERR = 17; | |
| 1419 | ||
| 1420 | // set up externs | |
| 1421 | G_vmlCanvasManager = G_vmlCanvasManager_; | |
| 1422 | CanvasRenderingContext2D = CanvasRenderingContext2D_; | |
| 1423 | CanvasGradient = CanvasGradient_; | |
| 1424 | CanvasPattern = CanvasPattern_; | |
| 1425 | DOMException = DOMException_; | |
| 1426 | })(); | |
| 1427 | ||
| 1428 | } // if | |
