| 1 | /* ***** BEGIN LICENSE BLOCK ***** |
| 2 | * Version: MPL 1.1/GPL 2.0/LGPL 2.1 |
| 3 | * |
| 4 | * The contents of this file are subject to the Mozilla Public License Version |
| 5 | * 1.1 (the "License"); you may not use this file except in compliance with |
| 6 | * the License. You may obtain a copy of the License at |
| 7 | * http://www.mozilla.org/MPL/ |
| 8 | * |
| 9 | * Software distributed under the License is distributed on an "AS IS" basis, |
| 10 | * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License |
| 11 | * for the specific language governing rights and limitations under the |
| 12 | * License. |
| 13 | * |
| 14 | * The Original Code is KaiRo.at Mandelbrot, XULRunner version. |
| 15 | * |
| 16 | * The Initial Developer of the Original Code is |
| 17 | * Robert Kaiser <kairo@kairo.at>. |
| 18 | * Portions created by the Initial Developer are Copyright (C) 2008-2011 |
| 19 | * the Initial Developer. All Rights Reserved. |
| 20 | * |
| 21 | * Contributor(s): |
| 22 | * Robert Kaiser <kairo@kairo.at> |
| 23 | * Boris Zbarsky <bzbarsky@mit.edu> |
| 24 | * |
| 25 | * Alternatively, the contents of this file may be used under the terms of |
| 26 | * either the GNU General Public License Version 2 or later (the "GPL"), or |
| 27 | * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), |
| 28 | * in which case the provisions of the GPL or the LGPL are applicable instead |
| 29 | * of those above. If you wish to allow use of your version of this file only |
| 30 | * under the terms of either the GPL or the LGPL, and not to allow others to |
| 31 | * use your version of this file under the terms of the MPL, indicate your |
| 32 | * decision by deleting the provisions above and replace them with the notice |
| 33 | * and other provisions required by the GPL or the LGPL. If you do not delete |
| 34 | * the provisions above, a recipient may use your version of this file under |
| 35 | * the terms of any one of the MPL, the GPL or the LGPL. |
| 36 | * |
| 37 | * ***** END LICENSE BLOCK ***** */ |
| 38 | |
| 39 | var gColorPalette = []; |
| 40 | var gStartTime = 0; |
| 41 | var gCurrentImageData; |
| 42 | var gLastImageData; |
| 43 | |
| 44 | function Startup() { |
| 45 | var img = document.getElementById("mbrotImage"); |
| 46 | img.addEventListener("mouseup", imgEvHandler, false); |
| 47 | img.addEventListener("mousedown", imgEvHandler, false); |
| 48 | img.addEventListener("mousemove", imgEvHandler, false); |
| 49 | img.addEventListener("touchstart", imgEvHandler, false); |
| 50 | img.addEventListener("touchend", imgEvHandler, false); |
| 51 | img.addEventListener("touchcancel", imgEvHandler, false); |
| 52 | img.addEventListener("touchleave", imgEvHandler, false); |
| 53 | img.addEventListener("touchmove", imgEvHandler, false); |
| 54 | } |
| 55 | |
| 56 | function getAdjustVal(aName) { |
| 57 | var value; |
| 58 | switch (aName) { |
| 59 | case "image.width": |
| 60 | case "image.height": |
| 61 | value = 0; |
| 62 | try { |
| 63 | value = document.getElementById(aName.replace(".", "_")).value; |
| 64 | } |
| 65 | catch (e) { } |
| 66 | if ((value < 10) || (value > 5000)) { |
| 67 | value = 300; |
| 68 | //document.getElementById(aName.replace(".", "_")).value = value; |
| 69 | } |
| 70 | return value; |
| 71 | case "last_image.Cr_*": |
| 72 | var Cr_min = -2.0; |
| 73 | var Cr_max = 1.0; |
| 74 | try { |
| 75 | Cr_min = parseFloat(document.getElementById("Cr_min").value); |
| 76 | Cr_max = parseFloat(document.getElementById("Cr_max").value); |
| 77 | } |
| 78 | catch (e) { } |
| 79 | if ((Cr_min < -3) || (Cr_min > 2) || |
| 80 | (Cr_max < -3) || (Cr_max > 2) || (Cr_min >= Cr_max)) { |
| 81 | Cr_min = -2.0; Cr_max = 1.0; |
| 82 | } |
| 83 | document.getElementById("Cr_min").value = Cr_min; |
| 84 | document.getElementById("Cr_max").value = Cr_max; |
| 85 | return {Cr_min: Cr_min, Cr_max: Cr_max}; |
| 86 | case "last_image.Ci_*": |
| 87 | var Ci_min = -1.5; |
| 88 | var Ci_max = 1.5; |
| 89 | try { |
| 90 | Ci_min = parseFloat(document.getElementById("Ci_min").value); |
| 91 | Ci_max = parseFloat(document.getElementById("Ci_max").value); |
| 92 | } |
| 93 | catch (e) { } |
| 94 | if ((Ci_min < -2.5) || (Ci_min > 2.5) || |
| 95 | (Ci_max < -2.5) || (Ci_max > 2.5) || (Ci_min >= Ci_max)) { |
| 96 | Ci_min = -1.5; Ci_max = 1.5; |
| 97 | } |
| 98 | document.getElementById("Ci_min").value = Ci_min; |
| 99 | document.getElementById("Ci_max").value = Ci_max; |
| 100 | return {Ci_min: Ci_min, Ci_max: Ci_max}; |
| 101 | case "iteration_max": |
| 102 | value = 500; |
| 103 | try { |
| 104 | value = document.getElementById("iterMax").value; |
| 105 | } |
| 106 | catch (e) { |
| 107 | setIter(value); |
| 108 | } |
| 109 | if (value < 10 || value > 10000) { |
| 110 | value = 500; |
| 111 | setIter(value); |
| 112 | } |
| 113 | return value; |
| 114 | case "use_algorithm": |
| 115 | value = "numeric"; |
| 116 | try { |
| 117 | value = document.getElementById("algorithm").value; |
| 118 | } |
| 119 | catch (e) { |
| 120 | setAlgorithm(value); |
| 121 | } |
| 122 | return value; |
| 123 | case "color_palette": |
| 124 | value = "kairo"; |
| 125 | try { |
| 126 | value = document.getElementById("palette").value; |
| 127 | } |
| 128 | catch(e) { |
| 129 | setPalette(value); |
| 130 | } |
| 131 | return value; |
| 132 | case "syncProportions": |
| 133 | value = true; |
| 134 | try { |
| 135 | value = document.getElementById("proportional").value; |
| 136 | } |
| 137 | catch(e) { |
| 138 | document.getElementById("proportional").value = value; |
| 139 | } |
| 140 | return value; |
| 141 | default: |
| 142 | return false; |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | function setVal(aName, aValue) { |
| 147 | switch (aName) { |
| 148 | case "image.width": |
| 149 | case "image.height": |
| 150 | document.getElementById(aName.replace(".", "_")).value = value; |
| 151 | break; |
| 152 | case "last_image.Cr_*": |
| 153 | document.getElementById("Cr_min").value = aValue.Cr_min; |
| 154 | document.getElementById("Cr_max").value = aValue.Cr_max; |
| 155 | break; |
| 156 | case "last_image.Ci_*": |
| 157 | document.getElementById("Ci_min").value = aValue.Ci_min; |
| 158 | document.getElementById("Ci_max").value = aValue.Ci_max; |
| 159 | break; |
| 160 | case "iteration_max": |
| 161 | setIter(aValue); |
| 162 | break; |
| 163 | case "use_algorithm": |
| 164 | setAlgorithm(aValue); |
| 165 | break; |
| 166 | case "color_palette": |
| 167 | setPalette(valueaValue); |
| 168 | break; |
| 169 | case "syncProportions": |
| 170 | document.getElementById("proportional").value = aValue; |
| 171 | break; |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | function adjustCoordsAndDraw(aC_min, aC_max) { |
| 176 | var iWidth = getAdjustVal("image.width"); |
| 177 | var iHeight = getAdjustVal("image.height"); |
| 178 | |
| 179 | // correct coordinates |
| 180 | if (aC_min.r < -2) |
| 181 | aC_min.r = -2; |
| 182 | if (aC_max.r > 2) |
| 183 | aC_max.r = 2; |
| 184 | if ((aC_min.r > 2) || (aC_max.r < -2) || (aC_min.r >= aC_max.r)) { |
| 185 | aC_min.r = -2.0; aC_max.r = 1.0; |
| 186 | } |
| 187 | if (aC_min.i < -2) |
| 188 | aC_min.i = -2; |
| 189 | if (aC_max.i > 2) |
| 190 | aC_max.i = 2; |
| 191 | if ((aC_min.i > 2) || (aC_max.i < -2) || (aC_min.i >= aC_max.i)) { |
| 192 | aC_min.i = -1.3; aC_max.i = 1.3; |
| 193 | } |
| 194 | |
| 195 | var CWidth = aC_max.r - aC_min.r; |
| 196 | var CHeight = aC_max.i - aC_min.i; |
| 197 | var C_mid = new complex(aC_min.r + CWidth / 2, aC_min.i + CHeight / 2); |
| 198 | |
| 199 | var CRatio = Math.max(CWidth / iWidth, CHeight / iHeight); |
| 200 | |
| 201 | setVal("last_image.Cr_*", {Cr_min: C_mid.r - iWidth * CRatio / 2, |
| 202 | Cr_max: C_mid.r + iWidth * CRatio / 2}); |
| 203 | setVal("last_image.Ci_*", {Ci_min: C_mid.i - iHeight * CRatio / 2, |
| 204 | Ci_max: C_mid.i + iHeight * CRatio / 2}); |
| 205 | |
| 206 | drawImage(); |
| 207 | } |
| 208 | |
| 209 | function drawImage() { |
| 210 | var canvas = document.getElementById("mbrotImage"); |
| 211 | var context = canvas.getContext("2d"); |
| 212 | |
| 213 | document.getElementById("calcTime").textContent = "--"; |
| 214 | |
| 215 | if (gCurrentImageData) { |
| 216 | gLastImageData = gCurrentImageData; |
| 217 | document.getElementById("backButton").disabled = false; |
| 218 | } |
| 219 | |
| 220 | gColorPalette = getColorPalette(document.getElementById("palette").value); |
| 221 | |
| 222 | var Cr_vals = getAdjustVal("last_image.Cr_*"); |
| 223 | var Cr_min = Cr_vals.Cr_min; |
| 224 | var Cr_max = Cr_vals.Cr_max; |
| 225 | |
| 226 | var Ci_vals = getAdjustVal("last_image.Ci_*"); |
| 227 | var Ci_min = Ci_vals.Ci_min; |
| 228 | var Ci_max = Ci_vals.Ci_max; |
| 229 | |
| 230 | var iterMax = getAdjustVal("iteration_max"); |
| 231 | var algorithm = getAdjustVal("use_algorithm"); |
| 232 | |
| 233 | var iWidth = canvas.width; |
| 234 | if ((iWidth < 10) || (iWidth > 5000)) { |
| 235 | iWidth = 300; |
| 236 | canvas.width = iWidth; |
| 237 | } |
| 238 | var iHeight = canvas.height; |
| 239 | if ((iHeight < 10) || (iHeight > 5000)) { |
| 240 | iHeight = 300; |
| 241 | canvas.height = iHeight; |
| 242 | } |
| 243 | |
| 244 | gCurrentImageData = { |
| 245 | C_min: new complex(Cr_min, Ci_min), |
| 246 | C_max: new complex(Cr_max, Ci_max), |
| 247 | iWidth: iWidth, |
| 248 | iHeight: iHeight, |
| 249 | iterMax: iterMax |
| 250 | }; |
| 251 | |
| 252 | context.fillStyle = "rgba(255, 255, 255, 127)"; |
| 253 | context.fillRect(0, 0, canvas.width, canvas.height); |
| 254 | |
| 255 | gStartTime = new Date(); |
| 256 | |
| 257 | drawLine(0, [Cr_min, Cr_max, Ci_min, Ci_max], |
| 258 | canvas, context, iterMax, algorithm); |
| 259 | } |
| 260 | |
| 261 | function drawLine(line, dimensions, canvas, context, iterMax, algorithm) { |
| 262 | var Cr_min = dimensions[0]; |
| 263 | var Cr_max = dimensions[1]; |
| 264 | var Cr_scale = Cr_max - Cr_min; |
| 265 | |
| 266 | var Ci_min = dimensions[2]; |
| 267 | var Ci_max = dimensions[3]; |
| 268 | var Ci_scale = Ci_max - Ci_min; |
| 269 | |
| 270 | var lines = Math.min(canvas.height - line, 8); |
| 271 | var imageData = context.createImageData(canvas.width, lines); |
| 272 | var pixels = imageData.data; |
| 273 | var idx = 0; |
| 274 | for (var img_y = line; img_y < canvas.height && img_y < line+8; img_y++) |
| 275 | for (var img_x = 0; img_x < canvas.width; img_x++) { |
| 276 | var C = new complex(Cr_min + (img_x / canvas.width) * Cr_scale, |
| 277 | Ci_min + (img_y / canvas.height) * Ci_scale); |
| 278 | var colors = drawPoint(context, img_x, img_y, C, iterMax, algorithm); |
| 279 | pixels[idx++] = colors[0]; |
| 280 | pixels[idx++] = colors[1]; |
| 281 | pixels[idx++] = colors[2]; |
| 282 | pixels[idx++] = colors[3]; |
| 283 | } |
| 284 | context.putImageData(imageData, 0, line); |
| 285 | |
| 286 | if (img_y < canvas.height) |
| 287 | setTimeout(drawLine, 0, img_y, dimensions, canvas, context, iterMax, algorithm); |
| 288 | else if (gStartTime) |
| 289 | EndCalc(); |
| 290 | } |
| 291 | |
| 292 | function EndCalc() { |
| 293 | var endTime = new Date(); |
| 294 | var timeUsed = (endTime.getTime() - gStartTime.getTime()) / 1000; |
| 295 | document.getElementById("calcTime").textContent = timeUsed.toFixed(3) + " seconds"; |
| 296 | } |
| 297 | |
| 298 | function complex(aReal, aImag) { |
| 299 | this.r = aReal; |
| 300 | this.i = aImag; |
| 301 | } |
| 302 | complex.prototype = { |
| 303 | square: function() { |
| 304 | return new complex(this.r * this.r - this.i * this.i, |
| 305 | 2 * this.r * this.i); |
| 306 | }, |
| 307 | dist: function() { |
| 308 | return Math.sqrt(this.r * this.r + this.i * this.i); |
| 309 | }, |
| 310 | add: function(aComplex) { |
| 311 | return new complex(this.r + aComplex.r, this.i + aComplex.i); |
| 312 | } |
| 313 | } |
| 314 | |
| 315 | function mandelbrotValueOO (aC, aIterMax) { |
| 316 | // this would be nice code in general but it looks like JS objects are too heavy for normal use. |
| 317 | var Z = new complex(0.0, 0.0); |
| 318 | for (var iter = 0; iter < aIterMax; iter++) { |
| 319 | Z = Z.square().add(aC); |
| 320 | if (Z.r * Z.r + Z.i * Z.i > 256) { break; } |
| 321 | } |
| 322 | return iter; |
| 323 | } |
| 324 | |
| 325 | function mandelbrotValueNumeric (aC, aIterMax) { |
| 326 | // optimized numeric code for fast calculation |
| 327 | var Cr = aC.r, Ci = aC.i; |
| 328 | var Zr = 0.0, Zi = 0.0; |
| 329 | var Zr2 = Zr * Zr, Zi2 = Zi * Zi; |
| 330 | for (var iter = 0; iter < aIterMax; iter++) { |
| 331 | Zi = 2 * Zr * Zi + Ci; |
| 332 | Zr = Zr2 - Zi2 + Cr; |
| 333 | |
| 334 | Zr2 = Zr * Zr; Zi2 = Zi * Zi; |
| 335 | if (Zr2 + Zi2 > 256) { break; } |
| 336 | } |
| 337 | return iter; |
| 338 | } |
| 339 | |
| 340 | function getColor(aIterValue, aIterMax) { |
| 341 | var standardizedValue = Math.round(aIterValue * 1024 / aIterMax); |
| 342 | if (gColorPalette && gColorPalette.length) |
| 343 | return gColorPalette[standardizedValue]; |
| 344 | |
| 345 | // fallback to simple b/w if for some reason we don't have a palette |
| 346 | if (aIterValue == aIterMax) |
| 347 | return [0, 0, 0, 255]; |
| 348 | else |
| 349 | return [255, 255, 255, 255]; |
| 350 | } |
| 351 | |
| 352 | function getColorPalette(palName) { |
| 353 | var palette = []; |
| 354 | switch (palName) { |
| 355 | case 'bw': |
| 356 | for (var i = 0; i < 1024; i++) { |
| 357 | palette[i] = [255, 255, 255, 255]; |
| 358 | } |
| 359 | palette[1024] = [0, 0, 0, 255]; |
| 360 | break; |
| 361 | case 'kairo': |
| 362 | // outer areas |
| 363 | for (var i = 0; i < 32; i++) { |
| 364 | var cc1 = Math.floor(i * 127 / 31); |
| 365 | var cc2 = 170 - Math.floor(i * 43 / 31); |
| 366 | palette[i] = [cc1, cc2, cc1, 255]; |
| 367 | } |
| 368 | // inner areas |
| 369 | for (var i = 0; i < 51; i++) { |
| 370 | var cc = Math.floor(i * 170 / 50); |
| 371 | palette[32 + i] = [cc, 0, (170-cc), 255]; |
| 372 | } |
| 373 | // corona |
| 374 | for (var i = 0; i < 101; i++) { |
| 375 | var cc = Math.floor(i * 200 / 100); |
| 376 | palette[83 + i] = [255, cc, 0, 255]; |
| 377 | } |
| 378 | // inner corona |
| 379 | for (var i = 0; i < 201; i++) { |
| 380 | var cc1 = 255 - Math.floor(i * 85 / 200); |
| 381 | var cc2 = 200 - Math.floor(i * 30 / 200); |
| 382 | var cc3 = Math.floor(i * 170 / 200); |
| 383 | palette[184 + i] = [cc1, cc2, cc3, 255]; |
| 384 | } |
| 385 | for (var i = 0; i < 301; i++) { |
| 386 | var cc1 = 170 - Math.floor(i * 43 / 300); |
| 387 | var cc2 = 170 + Math.floor(i * 85 / 300); |
| 388 | palette[385 + i] = [cc1, cc1, cc2, 255]; |
| 389 | } |
| 390 | for (var i = 0; i < 338; i++) { |
| 391 | var cc = 127 + Math.floor(i * 128 / 337); |
| 392 | palette[686 + i] = [cc, cc, 255, 255]; |
| 393 | } |
| 394 | palette[1024] = [0, 0, 0, 255]; |
| 395 | break; |
| 396 | case 'rainbow-linear1': |
| 397 | for (var i = 0; i < 256; i++) { |
| 398 | palette[i] = [i, 0, 0, 255]; |
| 399 | palette[256 + i] = [255, i, 0, 255]; |
| 400 | palette[512 + i] = [255 - i, 255, i, 255]; |
| 401 | palette[768 + i] = [i, 255-i, 255, 255]; |
| 402 | } |
| 403 | palette[1024] = [0, 0, 0, 255]; |
| 404 | break; |
| 405 | case 'rainbow-squared1': |
| 406 | for (var i = 0; i < 34; i++) { |
| 407 | var cc = Math.floor(i * 255 / 33); |
| 408 | palette[i] = [cc, 0, 0, 255]; |
| 409 | } |
| 410 | for (var i = 0; i < 137; i++) { |
| 411 | var cc = Math.floor(i * 255 / 136); |
| 412 | palette[34 + i] = [255, cc, 0, 255]; |
| 413 | } |
| 414 | for (var i = 0; i < 307; i++) { |
| 415 | var cc = Math.floor(i * 255 / 306); |
| 416 | palette[171 + i] = [255 - cc, 255, cc, 255]; |
| 417 | } |
| 418 | for (var i = 0; i < 546; i++) { |
| 419 | var cc = Math.floor(i * 255 / 545); |
| 420 | palette[478 + i] = [cc, 255 - cc, 255, 255]; |
| 421 | } |
| 422 | palette[1024] = [0, 0, 0, 255]; |
| 423 | break; |
| 424 | case 'rainbow-linear2': |
| 425 | for (var i = 0; i < 205; i++) { |
| 426 | var cc = Math.floor(i * 255 / 204); |
| 427 | palette[i] = [255, cc, 0, 255]; |
| 428 | palette[204 + i] = [255 - cc, 255, 0, 255]; |
| 429 | palette[409 + i] = [0, 255, cc, 255]; |
| 430 | palette[614 + i] = [0, 255 - cc, 255, 255]; |
| 431 | palette[819 + i] = [cc, 0, 255, 255]; |
| 432 | } |
| 433 | palette[1024] = [0, 0, 0, 255]; |
| 434 | break; |
| 435 | case 'rainbow-squared2': |
| 436 | for (var i = 0; i < 19; i++) { |
| 437 | var cc = Math.floor(i * 255 / 18); |
| 438 | palette[i] = [255, cc, 0, 255]; |
| 439 | } |
| 440 | for (var i = 0; i < 74; i++) { |
| 441 | var cc = Math.floor(i * 255 / 73); |
| 442 | palette[19 + i] = [255 - cc, 255, 0, 255]; |
| 443 | } |
| 444 | for (var i = 0; i < 168; i++) { |
| 445 | var cc = Math.floor(i * 255 / 167); |
| 446 | palette[93 + i] = [0, 255, cc, 255]; |
| 447 | } |
| 448 | for (var i = 0; i < 298; i++) { |
| 449 | var cc = Math.floor(i * 255 / 297); |
| 450 | palette[261 + i] = [0, 255 - cc, 255, 255]; |
| 451 | } |
| 452 | for (var i = 0; i < 465; i++) { |
| 453 | var cc = Math.floor(i * 255 / 464); |
| 454 | palette[559 + i] = [cc, 0, 255, 255]; |
| 455 | } |
| 456 | palette[1024] = [0, 0, 0, 255]; |
| 457 | break; |
| 458 | } |
| 459 | return palette; |
| 460 | } |
| 461 | |
| 462 | function drawPoint(context, img_x, img_y, C, iterMax, algorithm) { |
| 463 | var itVal; |
| 464 | switch (algorithm) { |
| 465 | case 'oo': |
| 466 | itVal = mandelbrotValueOO(C, iterMax); |
| 467 | break; |
| 468 | case 'numeric': |
| 469 | default: |
| 470 | itVal = mandelbrotValueNumeric(C, iterMax); |
| 471 | break; |
| 472 | } |
| 473 | return getColor(itVal, iterMax); |
| 474 | } |
| 475 | |
| 476 | // ########## UI functions ########## |
| 477 | |
| 478 | var zoomstart; |
| 479 | var imgBackup; |
| 480 | var zoomTouchID; |
| 481 | |
| 482 | var imgEvHandler = { |
| 483 | handleEvent: function(aEvent) { |
| 484 | var canvas = document.getElementById("mbrotImage"); |
| 485 | var context = canvas.getContext("2d"); |
| 486 | var touchEvent = aEvent.type.indexOf('touch') != -1; |
| 487 | |
| 488 | // Bail out if this is neither a touch nor left-click. |
| 489 | if (!touchEvent && aEvent.button != 0) |
| 490 | return; |
| 491 | |
| 492 | // Bail out if the started touch can't be found. |
| 493 | if (touchEvent && zoomstart && |
| 494 | !aEvent.changedTouches.identifiedTouch(zoomTouchID)) |
| 495 | return; |
| 496 | |
| 497 | var coordObj = touchEvent ? |
| 498 | aEvent.changedTouches.identifiedTouch(zoomTouchID) : |
| 499 | aEvent; |
| 500 | |
| 501 | switch (aEvent.type) { |
| 502 | case 'mousedown': |
| 503 | case 'touchstart': |
| 504 | if (touchEvent) { |
| 505 | zoomTouchID = aEvent.changedTouches.item(0).identifier; |
| 506 | coordObj = aEvent.changedTouches.identifiedTouch(zoomTouchID); |
| 507 | } |
| 508 | // left button - start dragzoom |
| 509 | zoomstart = {x: coordObj.clientX - canvas.offsetLeft, |
| 510 | y: coordObj.clientY - canvas.offsetTop}; |
| 511 | imgBackup = context.getImageData(0, 0, canvas.width, canvas.height); |
| 512 | break; |
| 513 | case 'mouseup': |
| 514 | case 'touchend': |
| 515 | if (zoomstart) { |
| 516 | context.putImageData(imgBackup, 0, 0); |
| 517 | var zoomend = {x: coordObj.clientX - canvas.offsetLeft, |
| 518 | y: coordObj.clientY - canvas.offsetTop}; |
| 519 | |
| 520 | // make sure zoomend is bigger than zoomstart |
| 521 | if ((zoomend.x == zoomstart.x) || (zoomend.y == zoomstart.y)) { |
| 522 | // cannot zoom what has no area, discard it |
| 523 | zoomstart = undefined; |
| 524 | return; |
| 525 | } |
| 526 | if (zoomend.x < zoomstart.x) |
| 527 | [zoomend.x, zoomstart.x] = [zoomstart.x, zoomend.x]; |
| 528 | if (zoomend.y < zoomstart.y) |
| 529 | [zoomend.y, zoomstart.y] = [zoomstart.y, zoomend.y]; |
| 530 | |
| 531 | if (gCurrentImageData) { |
| 532 | // determine new "coordinates" |
| 533 | var CWidth = gCurrentImageData.C_max.r - gCurrentImageData.C_min.r; |
| 534 | var CHeight = gCurrentImageData.C_max.i - gCurrentImageData.C_min.i; |
| 535 | var newC_min = new complex( |
| 536 | gCurrentImageData.C_min.r + zoomstart.x / gCurrentImageData.iWidth * CWidth, |
| 537 | gCurrentImageData.C_min.i + zoomstart.y / gCurrentImageData.iHeight * CHeight); |
| 538 | var newC_max = new complex( |
| 539 | gCurrentImageData.C_min.r + zoomend.x / gCurrentImageData.iWidth * CWidth, |
| 540 | gCurrentImageData.C_min.i + zoomend.y / gCurrentImageData.iHeight * CHeight); |
| 541 | } |
| 542 | else { |
| 543 | var newC_min = new complex(-2, -1.5); |
| 544 | var newC_max = new complex(1, 1.5); |
| 545 | } |
| 546 | |
| 547 | adjustCoordsAndDraw(newC_min, newC_max); |
| 548 | } |
| 549 | zoomstart = undefined; |
| 550 | break; |
| 551 | case 'mousemove': |
| 552 | case 'touchmove': |
| 553 | if (zoomstart) { |
| 554 | context.putImageData(imgBackup, 0, 0); |
| 555 | context.strokeStyle = "rgb(255,255,31)"; |
| 556 | context.strokeRect(zoomstart.x, zoomstart.y, |
| 557 | coordObj.clientX - canvas.offsetLeft - zoomstart.x, |
| 558 | coordObj.clientY - canvas.offsetTop - zoomstart.y); |
| 559 | } |
| 560 | break; |
| 561 | } |
| 562 | } |
| 563 | }; |
| 564 | |
| 565 | function drawIfEmpty() { |
| 566 | if (!gCurrentImageData) { |
| 567 | drawImage(); |
| 568 | } |
| 569 | } |
| 570 | |
| 571 | function toggleSettings() { |
| 572 | var fs = document.getElementById("settings"); |
| 573 | if (fs.style.display != "block") { |
| 574 | fs.style.display = "block"; |
| 575 | } |
| 576 | else { |
| 577 | fs.style.display = "none"; |
| 578 | } |
| 579 | } |
| 580 | |
| 581 | function goBack() { |
| 582 | if (gLastImageData) { |
| 583 | document.getElementById("iterMax").value = gLastImageData.iterMax; |
| 584 | // use gLastImageData.iWidth, gLastImageData.iHeight ??? |
| 585 | adjustCoordsAndDraw(gLastImageData.C_min, gLastImageData.C_max); |
| 586 | gLastImageData = undefined; |
| 587 | document.getElementById("backButton").disabled = true; |
| 588 | } |
| 589 | } |
| 590 | |
| 591 | function setIter(aIter) { |
| 592 | document.getElementById("iterMax").value = aIter; |
| 593 | } |
| 594 | |
| 595 | function setPalette(aPaletteID) { |
| 596 | document.getElementById("palette").value = aPaletteID; |
| 597 | gColorPalette = getColorPalette(aPaletteID); |
| 598 | } |
| 599 | |
| 600 | function setAlgorithm(algoID) { |
| 601 | //document.getElementById("algorithm").value = algoID; |
| 602 | } |