1 /* ***** BEGIN LICENSE BLOCK *****
2 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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/
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
14 * The Original Code is KaiRo.at Mandelbrot, XULRunner version.
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.
22 * Robert Kaiser <kairo@kairo.at>
23 * Boris Zbarsky <bzbarsky@mit.edu>
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.
37 * ***** END LICENSE BLOCK ***** */
39 var gColorPalette = [];
41 var gCurrentImageData;
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);
56 function getAdjustVal(aName) {
63 value = document.getElementById(aName.replace(".", "_")).value;
66 if ((value < 10) || (value > 5000)) {
68 //document.getElementById(aName.replace(".", "_")).value = value;
71 case "last_image.Cr_*":
75 Cr_min = parseFloat(document.getElementById("Cr_min").value);
76 Cr_max = parseFloat(document.getElementById("Cr_max").value);
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;
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_*":
90 Ci_min = parseFloat(document.getElementById("Ci_min").value);
91 Ci_max = parseFloat(document.getElementById("Ci_max").value);
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;
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":
104 value = document.getElementById("iterMax").value;
109 if (value < 10 || value > 10000) {
114 case "use_algorithm":
117 value = document.getElementById("algorithm").value;
123 case "color_palette":
126 value = document.getElementById("palette").value;
132 case "syncProportions":
135 value = document.getElementById("proportional").value;
138 document.getElementById("proportional").value = value;
146 function setVal(aName, aValue) {
150 document.getElementById(aName.replace(".", "_")).value = value;
152 case "last_image.Cr_*":
153 document.getElementById("Cr_min").value = aValue.Cr_min;
154 document.getElementById("Cr_max").value = aValue.Cr_max;
156 case "last_image.Ci_*":
157 document.getElementById("Ci_min").value = aValue.Ci_min;
158 document.getElementById("Ci_max").value = aValue.Ci_max;
160 case "iteration_max":
163 case "use_algorithm":
164 setAlgorithm(aValue);
166 case "color_palette":
167 setPalette(valueaValue);
169 case "syncProportions":
170 document.getElementById("proportional").value = aValue;
175 function adjustCoordsAndDraw(aC_min, aC_max) {
176 var iWidth = getAdjustVal("image.width");
177 var iHeight = getAdjustVal("image.height");
179 // correct coordinates
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;
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;
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);
199 var CRatio = Math.max(CWidth / iWidth, CHeight / iHeight);
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});
209 function drawImage() {
210 var canvas = document.getElementById("mbrotImage");
211 var context = canvas.getContext("2d");
213 document.getElementById("calcTime").textContent = "--";
215 if (gCurrentImageData) {
216 gLastImageData = gCurrentImageData;
217 document.getElementById("backButton").disabled = false;
220 gColorPalette = getColorPalette(document.getElementById("palette").value);
222 var Cr_vals = getAdjustVal("last_image.Cr_*");
223 var Cr_min = Cr_vals.Cr_min;
224 var Cr_max = Cr_vals.Cr_max;
226 var Ci_vals = getAdjustVal("last_image.Ci_*");
227 var Ci_min = Ci_vals.Ci_min;
228 var Ci_max = Ci_vals.Ci_max;
230 var iterMax = getAdjustVal("iteration_max");
231 var algorithm = getAdjustVal("use_algorithm");
233 var iWidth = canvas.width;
234 if ((iWidth < 10) || (iWidth > 5000)) {
236 canvas.width = iWidth;
238 var iHeight = canvas.height;
239 if ((iHeight < 10) || (iHeight > 5000)) {
241 canvas.height = iHeight;
244 gCurrentImageData = {
245 C_min: new complex(Cr_min, Ci_min),
246 C_max: new complex(Cr_max, Ci_max),
252 context.fillStyle = "rgba(255, 255, 255, 127)";
253 context.fillRect(0, 0, canvas.width, canvas.height);
255 gStartTime = new Date();
257 drawLine(0, [Cr_min, Cr_max, Ci_min, Ci_max],
258 canvas, context, iterMax, algorithm);
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;
266 var Ci_min = dimensions[2];
267 var Ci_max = dimensions[3];
268 var Ci_scale = Ci_max - Ci_min;
270 var lines = Math.min(canvas.height - line, 8);
271 var imageData = context.createImageData(canvas.width, lines);
272 var pixels = imageData.data;
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];
284 context.putImageData(imageData, 0, line);
286 if (img_y < canvas.height)
287 setTimeout(drawLine, 0, img_y, dimensions, canvas, context, iterMax, algorithm);
293 var endTime = new Date();
294 var timeUsed = (endTime.getTime() - gStartTime.getTime()) / 1000;
295 document.getElementById("calcTime").textContent = timeUsed.toFixed(3) + " seconds";
298 function complex(aReal, aImag) {
302 complex.prototype = {
304 return new complex(this.r * this.r - this.i * this.i,
305 2 * this.r * this.i);
308 return Math.sqrt(this.r * this.r + this.i * this.i);
310 add: function(aComplex) {
311 return new complex(this.r + aComplex.r, this.i + aComplex.i);
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; }
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;
334 Zr2 = Zr * Zr; Zi2 = Zi * Zi;
335 if (Zr2 + Zi2 > 256) { break; }
340 function getColor(aIterValue, aIterMax) {
341 var standardizedValue = Math.round(aIterValue * 1024 / aIterMax);
342 if (gColorPalette && gColorPalette.length)
343 return gColorPalette[standardizedValue];
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];
349 return [255, 255, 255, 255];
352 function getColorPalette(palName) {
356 for (var i = 0; i < 1024; i++) {
357 palette[i] = [255, 255, 255, 255];
359 palette[1024] = [0, 0, 0, 255];
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];
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];
374 for (var i = 0; i < 101; i++) {
375 var cc = Math.floor(i * 200 / 100);
376 palette[83 + i] = [255, cc, 0, 255];
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];
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];
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];
394 palette[1024] = [0, 0, 0, 255];
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];
403 palette[1024] = [0, 0, 0, 255];
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];
410 for (var i = 0; i < 137; i++) {
411 var cc = Math.floor(i * 255 / 136);
412 palette[34 + i] = [255, cc, 0, 255];
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];
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];
422 palette[1024] = [0, 0, 0, 255];
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];
433 palette[1024] = [0, 0, 0, 255];
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];
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];
444 for (var i = 0; i < 168; i++) {
445 var cc = Math.floor(i * 255 / 167);
446 palette[93 + i] = [0, 255, cc, 255];
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];
452 for (var i = 0; i < 465; i++) {
453 var cc = Math.floor(i * 255 / 464);
454 palette[559 + i] = [cc, 0, 255, 255];
456 palette[1024] = [0, 0, 0, 255];
462 function drawPoint(context, img_x, img_y, C, iterMax, algorithm) {
466 itVal = mandelbrotValueOO(C, iterMax);
470 itVal = mandelbrotValueNumeric(C, iterMax);
473 return getColor(itVal, iterMax);
476 // ########## UI functions ##########
483 handleEvent: function(aEvent) {
484 var canvas = document.getElementById("mbrotImage");
485 var context = canvas.getContext("2d");
486 var touchEvent = aEvent.type.indexOf('touch') != -1;
488 // Bail out if this is neither a touch nor left-click.
489 if (!touchEvent && aEvent.button != 0)
492 // Bail out if the started touch can't be found.
493 if (touchEvent && zoomstart &&
494 !aEvent.changedTouches.identifiedTouch(zoomTouchID))
497 var coordObj = touchEvent ?
498 aEvent.changedTouches.identifiedTouch(zoomTouchID) :
501 switch (aEvent.type) {
505 zoomTouchID = aEvent.changedTouches.item(0).identifier;
506 coordObj = aEvent.changedTouches.identifiedTouch(zoomTouchID);
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);
516 context.putImageData(imgBackup, 0, 0);
517 var zoomend = {x: coordObj.clientX - canvas.offsetLeft,
518 y: coordObj.clientY - canvas.offsetTop};
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;
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];
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);
543 var newC_min = new complex(-2, -1.5);
544 var newC_max = new complex(1, 1.5);
547 adjustCoordsAndDraw(newC_min, newC_max);
549 zoomstart = undefined;
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);
565 function drawIfEmpty() {
566 if (!gCurrentImageData) {
571 function toggleSettings() {
572 var fs = document.getElementById("settings");
573 if (fs.style.display != "block") {
574 fs.style.display = "block";
577 fs.style.display = "none";
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;
591 function setIter(aIter) {
592 document.getElementById("iterMax").value = aIter;
595 function setPalette(aPaletteID) {
596 document.getElementById("palette").value = aPaletteID;
597 gColorPalette = getColorPalette(aPaletteID);
600 function setAlgorithm(algoID) {
601 //document.getElementById("algorithm").value = algoID;