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d0244cd3 RK |
1 | /* This Source Code Form is subject to the terms of the Mozilla Public |
2 | * License, v. 2.0. If a copy of the MPL was not distributed with this file, | |
3 | * You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
6a7aa57d | 4 | |
51442fd4 | 5 | var gMainCanvas, gMainContext; |
6a7aa57d RK |
6 | var gColorPalette = []; |
7 | var gStartTime = 0; | |
becdac35 RK |
8 | var gCurrentImageData; |
9 | var gLastImageData; | |
10 | ||
11 | function Startup() { | |
51442fd4 RK |
12 | gMainCanvas = document.getElementById("mbrotImage"); |
13 | gMainContext = gMainCanvas.getContext("2d"); | |
14 | ||
15 | gMainCanvas.addEventListener("mouseup", imgEvHandler, false); | |
16 | gMainCanvas.addEventListener("mousedown", imgEvHandler, false); | |
17 | gMainCanvas.addEventListener("mousemove", imgEvHandler, false); | |
18 | gMainCanvas.addEventListener("touchstart", imgEvHandler, false); | |
19 | gMainCanvas.addEventListener("touchend", imgEvHandler, false); | |
20 | gMainCanvas.addEventListener("touchcancel", imgEvHandler, false); | |
21 | gMainCanvas.addEventListener("touchleave", imgEvHandler, false); | |
22 | gMainCanvas.addEventListener("touchmove", imgEvHandler, false); | |
23 | ||
24 | var initTile = new Image(); | |
25 | initTile.src = "style/initial-overview.png"; | |
26 | gMainContext.drawImage(initTile, 0, 0); | |
becdac35 RK |
27 | } |
28 | ||
29 | function getAdjustVal(aName) { | |
30 | var value; | |
31 | switch (aName) { | |
32 | case "image.width": | |
33 | case "image.height": | |
34 | value = 0; | |
35 | try { | |
36 | value = document.getElementById(aName.replace(".", "_")).value; | |
37 | } | |
38 | catch (e) { } | |
39 | if ((value < 10) || (value > 5000)) { | |
40 | value = 300; | |
41 | //document.getElementById(aName.replace(".", "_")).value = value; | |
42 | } | |
43 | return value; | |
44 | case "last_image.Cr_*": | |
45 | var Cr_min = -2.0; | |
46 | var Cr_max = 1.0; | |
47 | try { | |
48 | Cr_min = parseFloat(document.getElementById("Cr_min").value); | |
49 | Cr_max = parseFloat(document.getElementById("Cr_max").value); | |
50 | } | |
51 | catch (e) { } | |
52 | if ((Cr_min < -3) || (Cr_min > 2) || | |
53 | (Cr_max < -3) || (Cr_max > 2) || (Cr_min >= Cr_max)) { | |
54 | Cr_min = -2.0; Cr_max = 1.0; | |
55 | } | |
56 | document.getElementById("Cr_min").value = Cr_min; | |
57 | document.getElementById("Cr_max").value = Cr_max; | |
58 | return {Cr_min: Cr_min, Cr_max: Cr_max}; | |
59 | case "last_image.Ci_*": | |
60 | var Ci_min = -1.5; | |
61 | var Ci_max = 1.5; | |
62 | try { | |
63 | Ci_min = parseFloat(document.getElementById("Ci_min").value); | |
64 | Ci_max = parseFloat(document.getElementById("Ci_max").value); | |
65 | } | |
66 | catch (e) { } | |
67 | if ((Ci_min < -2.5) || (Ci_min > 2.5) || | |
68 | (Ci_max < -2.5) || (Ci_max > 2.5) || (Ci_min >= Ci_max)) { | |
69 | Ci_min = -1.5; Ci_max = 1.5; | |
70 | } | |
71 | document.getElementById("Ci_min").value = Ci_min; | |
72 | document.getElementById("Ci_max").value = Ci_max; | |
73 | return {Ci_min: Ci_min, Ci_max: Ci_max}; | |
74 | case "iteration_max": | |
75 | value = 500; | |
76 | try { | |
77 | value = document.getElementById("iterMax").value; | |
78 | } | |
79 | catch (e) { | |
80 | setIter(value); | |
81 | } | |
82 | if (value < 10 || value > 10000) { | |
83 | value = 500; | |
84 | setIter(value); | |
85 | } | |
86 | return value; | |
87 | case "use_algorithm": | |
88 | value = "numeric"; | |
89 | try { | |
90 | value = document.getElementById("algorithm").value; | |
91 | } | |
92 | catch (e) { | |
93 | setAlgorithm(value); | |
94 | } | |
95 | return value; | |
96 | case "color_palette": | |
97 | value = "kairo"; | |
98 | try { | |
99 | value = document.getElementById("palette").value; | |
100 | } | |
101 | catch(e) { | |
102 | setPalette(value); | |
103 | } | |
104 | return value; | |
105 | case "syncProportions": | |
106 | value = true; | |
107 | try { | |
108 | value = document.getElementById("proportional").value; | |
109 | } | |
110 | catch(e) { | |
111 | document.getElementById("proportional").value = value; | |
112 | } | |
113 | return value; | |
114 | default: | |
115 | return false; | |
116 | } | |
117 | } | |
118 | ||
119 | function setVal(aName, aValue) { | |
120 | switch (aName) { | |
121 | case "image.width": | |
122 | case "image.height": | |
123 | document.getElementById(aName.replace(".", "_")).value = value; | |
124 | break; | |
125 | case "last_image.Cr_*": | |
126 | document.getElementById("Cr_min").value = aValue.Cr_min; | |
127 | document.getElementById("Cr_max").value = aValue.Cr_max; | |
128 | break; | |
129 | case "last_image.Ci_*": | |
130 | document.getElementById("Ci_min").value = aValue.Ci_min; | |
131 | document.getElementById("Ci_max").value = aValue.Ci_max; | |
132 | break; | |
133 | case "iteration_max": | |
134 | setIter(aValue); | |
135 | break; | |
136 | case "use_algorithm": | |
137 | setAlgorithm(aValue); | |
138 | break; | |
139 | case "color_palette": | |
140 | setPalette(valueaValue); | |
141 | break; | |
142 | case "syncProportions": | |
143 | document.getElementById("proportional").value = aValue; | |
144 | break; | |
145 | } | |
146 | } | |
147 | ||
148 | function adjustCoordsAndDraw(aC_min, aC_max) { | |
149 | var iWidth = getAdjustVal("image.width"); | |
150 | var iHeight = getAdjustVal("image.height"); | |
151 | ||
152 | // correct coordinates | |
153 | if (aC_min.r < -2) | |
154 | aC_min.r = -2; | |
155 | if (aC_max.r > 2) | |
156 | aC_max.r = 2; | |
157 | if ((aC_min.r > 2) || (aC_max.r < -2) || (aC_min.r >= aC_max.r)) { | |
158 | aC_min.r = -2.0; aC_max.r = 1.0; | |
159 | } | |
160 | if (aC_min.i < -2) | |
161 | aC_min.i = -2; | |
162 | if (aC_max.i > 2) | |
163 | aC_max.i = 2; | |
164 | if ((aC_min.i > 2) || (aC_max.i < -2) || (aC_min.i >= aC_max.i)) { | |
165 | aC_min.i = -1.3; aC_max.i = 1.3; | |
166 | } | |
167 | ||
168 | var CWidth = aC_max.r - aC_min.r; | |
169 | var CHeight = aC_max.i - aC_min.i; | |
170 | var C_mid = new complex(aC_min.r + CWidth / 2, aC_min.i + CHeight / 2); | |
171 | ||
172 | var CRatio = Math.max(CWidth / iWidth, CHeight / iHeight); | |
173 | ||
174 | setVal("last_image.Cr_*", {Cr_min: C_mid.r - iWidth * CRatio / 2, | |
175 | Cr_max: C_mid.r + iWidth * CRatio / 2}); | |
176 | setVal("last_image.Ci_*", {Ci_min: C_mid.i - iHeight * CRatio / 2, | |
177 | Ci_max: C_mid.i + iHeight * CRatio / 2}); | |
178 | ||
179 | drawImage(); | |
180 | } | |
6a7aa57d RK |
181 | |
182 | function drawImage() { | |
51442fd4 RK |
183 | var canvas = gMainCanvas; |
184 | var context = gMainContext; | |
6a7aa57d RK |
185 | |
186 | document.getElementById("calcTime").textContent = "--"; | |
187 | ||
becdac35 RK |
188 | if (gCurrentImageData) { |
189 | gLastImageData = gCurrentImageData; | |
95d05599 | 190 | document.getElementById("backButton").disabled = false; |
becdac35 RK |
191 | } |
192 | ||
6a7aa57d RK |
193 | gColorPalette = getColorPalette(document.getElementById("palette").value); |
194 | ||
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195 | var Cr_vals = getAdjustVal("last_image.Cr_*"); |
196 | var Cr_min = Cr_vals.Cr_min; | |
197 | var Cr_max = Cr_vals.Cr_max; | |
6a7aa57d | 198 | |
becdac35 RK |
199 | var Ci_vals = getAdjustVal("last_image.Ci_*"); |
200 | var Ci_min = Ci_vals.Ci_min; | |
201 | var Ci_max = Ci_vals.Ci_max; | |
202 | ||
203 | var iterMax = getAdjustVal("iteration_max"); | |
204 | var algorithm = getAdjustVal("use_algorithm"); | |
6a7aa57d RK |
205 | |
206 | var iWidth = canvas.width; | |
207 | if ((iWidth < 10) || (iWidth > 5000)) { | |
208 | iWidth = 300; | |
209 | canvas.width = iWidth; | |
210 | } | |
211 | var iHeight = canvas.height; | |
212 | if ((iHeight < 10) || (iHeight > 5000)) { | |
213 | iHeight = 300; | |
214 | canvas.height = iHeight; | |
215 | } | |
216 | ||
becdac35 RK |
217 | gCurrentImageData = { |
218 | C_min: new complex(Cr_min, Ci_min), | |
219 | C_max: new complex(Cr_max, Ci_max), | |
220 | iWidth: iWidth, | |
221 | iHeight: iHeight, | |
222 | iterMax: iterMax | |
223 | }; | |
224 | ||
6a7aa57d RK |
225 | context.fillStyle = "rgba(255, 255, 255, 127)"; |
226 | context.fillRect(0, 0, canvas.width, canvas.height); | |
227 | ||
228 | gStartTime = new Date(); | |
229 | ||
230 | drawLine(0, [Cr_min, Cr_max, Ci_min, Ci_max], | |
231 | canvas, context, iterMax, algorithm); | |
232 | } | |
233 | ||
234 | function drawLine(line, dimensions, canvas, context, iterMax, algorithm) { | |
235 | var Cr_min = dimensions[0]; | |
236 | var Cr_max = dimensions[1]; | |
237 | var Cr_scale = Cr_max - Cr_min; | |
238 | ||
239 | var Ci_min = dimensions[2]; | |
240 | var Ci_max = dimensions[3]; | |
241 | var Ci_scale = Ci_max - Ci_min; | |
242 | ||
243 | var lines = Math.min(canvas.height - line, 8); | |
244 | var imageData = context.createImageData(canvas.width, lines); | |
245 | var pixels = imageData.data; | |
246 | var idx = 0; | |
247 | for (var img_y = line; img_y < canvas.height && img_y < line+8; img_y++) | |
248 | for (var img_x = 0; img_x < canvas.width; img_x++) { | |
249 | var C = new complex(Cr_min + (img_x / canvas.width) * Cr_scale, | |
250 | Ci_min + (img_y / canvas.height) * Ci_scale); | |
251 | var colors = drawPoint(context, img_x, img_y, C, iterMax, algorithm); | |
252 | pixels[idx++] = colors[0]; | |
253 | pixels[idx++] = colors[1]; | |
254 | pixels[idx++] = colors[2]; | |
255 | pixels[idx++] = colors[3]; | |
256 | } | |
257 | context.putImageData(imageData, 0, line); | |
258 | ||
259 | if (img_y < canvas.height) | |
260 | setTimeout(drawLine, 0, img_y, dimensions, canvas, context, iterMax, algorithm); | |
261 | else if (gStartTime) | |
262 | EndCalc(); | |
263 | } | |
264 | ||
265 | function EndCalc() { | |
266 | var endTime = new Date(); | |
267 | var timeUsed = (endTime.getTime() - gStartTime.getTime()) / 1000; | |
268 | document.getElementById("calcTime").textContent = timeUsed.toFixed(3) + " seconds"; | |
269 | } | |
270 | ||
271 | function complex(aReal, aImag) { | |
272 | this.r = aReal; | |
273 | this.i = aImag; | |
274 | } | |
275 | complex.prototype = { | |
276 | square: function() { | |
277 | return new complex(this.r * this.r - this.i * this.i, | |
278 | 2 * this.r * this.i); | |
279 | }, | |
280 | dist: function() { | |
281 | return Math.sqrt(this.r * this.r + this.i * this.i); | |
282 | }, | |
283 | add: function(aComplex) { | |
284 | return new complex(this.r + aComplex.r, this.i + aComplex.i); | |
285 | } | |
286 | } | |
287 | ||
288 | function mandelbrotValueOO (aC, aIterMax) { | |
289 | // this would be nice code in general but it looks like JS objects are too heavy for normal use. | |
290 | var Z = new complex(0.0, 0.0); | |
291 | for (var iter = 0; iter < aIterMax; iter++) { | |
292 | Z = Z.square().add(aC); | |
293 | if (Z.r * Z.r + Z.i * Z.i > 256) { break; } | |
294 | } | |
295 | return iter; | |
296 | } | |
297 | ||
298 | function mandelbrotValueNumeric (aC, aIterMax) { | |
299 | // optimized numeric code for fast calculation | |
300 | var Cr = aC.r, Ci = aC.i; | |
301 | var Zr = 0.0, Zi = 0.0; | |
302 | var Zr2 = Zr * Zr, Zi2 = Zi * Zi; | |
303 | for (var iter = 0; iter < aIterMax; iter++) { | |
304 | Zi = 2 * Zr * Zi + Ci; | |
305 | Zr = Zr2 - Zi2 + Cr; | |
306 | ||
307 | Zr2 = Zr * Zr; Zi2 = Zi * Zi; | |
308 | if (Zr2 + Zi2 > 256) { break; } | |
309 | } | |
310 | return iter; | |
311 | } | |
312 | ||
313 | function getColor(aIterValue, aIterMax) { | |
314 | var standardizedValue = Math.round(aIterValue * 1024 / aIterMax); | |
315 | if (gColorPalette && gColorPalette.length) | |
316 | return gColorPalette[standardizedValue]; | |
317 | ||
318 | // fallback to simple b/w if for some reason we don't have a palette | |
319 | if (aIterValue == aIterMax) | |
320 | return [0, 0, 0, 255]; | |
321 | else | |
322 | return [255, 255, 255, 255]; | |
323 | } | |
324 | ||
325 | function getColorPalette(palName) { | |
326 | var palette = []; | |
327 | switch (palName) { | |
328 | case 'bw': | |
329 | for (var i = 0; i < 1024; i++) { | |
330 | palette[i] = [255, 255, 255, 255]; | |
331 | } | |
332 | palette[1024] = [0, 0, 0, 255]; | |
333 | break; | |
334 | case 'kairo': | |
335 | // outer areas | |
336 | for (var i = 0; i < 32; i++) { | |
337 | var cc1 = Math.floor(i * 127 / 31); | |
338 | var cc2 = 170 - Math.floor(i * 43 / 31); | |
339 | palette[i] = [cc1, cc2, cc1, 255]; | |
340 | } | |
341 | // inner areas | |
342 | for (var i = 0; i < 51; i++) { | |
343 | var cc = Math.floor(i * 170 / 50); | |
344 | palette[32 + i] = [cc, 0, (170-cc), 255]; | |
345 | } | |
346 | // corona | |
347 | for (var i = 0; i < 101; i++) { | |
348 | var cc = Math.floor(i * 200 / 100); | |
349 | palette[83 + i] = [255, cc, 0, 255]; | |
350 | } | |
351 | // inner corona | |
352 | for (var i = 0; i < 201; i++) { | |
353 | var cc1 = 255 - Math.floor(i * 85 / 200); | |
354 | var cc2 = 200 - Math.floor(i * 30 / 200); | |
355 | var cc3 = Math.floor(i * 170 / 200); | |
356 | palette[184 + i] = [cc1, cc2, cc3, 255]; | |
357 | } | |
358 | for (var i = 0; i < 301; i++) { | |
359 | var cc1 = 170 - Math.floor(i * 43 / 300); | |
360 | var cc2 = 170 + Math.floor(i * 85 / 300); | |
361 | palette[385 + i] = [cc1, cc1, cc2, 255]; | |
362 | } | |
363 | for (var i = 0; i < 338; i++) { | |
364 | var cc = 127 + Math.floor(i * 128 / 337); | |
365 | palette[686 + i] = [cc, cc, 255, 255]; | |
366 | } | |
367 | palette[1024] = [0, 0, 0, 255]; | |
368 | break; | |
369 | case 'rainbow-linear1': | |
370 | for (var i = 0; i < 256; i++) { | |
371 | palette[i] = [i, 0, 0, 255]; | |
372 | palette[256 + i] = [255, i, 0, 255]; | |
373 | palette[512 + i] = [255 - i, 255, i, 255]; | |
374 | palette[768 + i] = [i, 255-i, 255, 255]; | |
375 | } | |
376 | palette[1024] = [0, 0, 0, 255]; | |
377 | break; | |
becdac35 RK |
378 | case 'rainbow-squared1': |
379 | for (var i = 0; i < 34; i++) { | |
380 | var cc = Math.floor(i * 255 / 33); | |
381 | palette[i] = [cc, 0, 0, 255]; | |
382 | } | |
383 | for (var i = 0; i < 137; i++) { | |
384 | var cc = Math.floor(i * 255 / 136); | |
385 | palette[34 + i] = [255, cc, 0, 255]; | |
386 | } | |
387 | for (var i = 0; i < 307; i++) { | |
388 | var cc = Math.floor(i * 255 / 306); | |
389 | palette[171 + i] = [255 - cc, 255, cc, 255]; | |
390 | } | |
391 | for (var i = 0; i < 546; i++) { | |
392 | var cc = Math.floor(i * 255 / 545); | |
393 | palette[478 + i] = [cc, 255 - cc, 255, 255]; | |
394 | } | |
395 | palette[1024] = [0, 0, 0, 255]; | |
396 | break; | |
397 | case 'rainbow-linear2': | |
398 | for (var i = 0; i < 205; i++) { | |
399 | var cc = Math.floor(i * 255 / 204); | |
400 | palette[i] = [255, cc, 0, 255]; | |
401 | palette[204 + i] = [255 - cc, 255, 0, 255]; | |
402 | palette[409 + i] = [0, 255, cc, 255]; | |
403 | palette[614 + i] = [0, 255 - cc, 255, 255]; | |
404 | palette[819 + i] = [cc, 0, 255, 255]; | |
405 | } | |
406 | palette[1024] = [0, 0, 0, 255]; | |
407 | break; | |
408 | case 'rainbow-squared2': | |
409 | for (var i = 0; i < 19; i++) { | |
410 | var cc = Math.floor(i * 255 / 18); | |
411 | palette[i] = [255, cc, 0, 255]; | |
412 | } | |
413 | for (var i = 0; i < 74; i++) { | |
414 | var cc = Math.floor(i * 255 / 73); | |
415 | palette[19 + i] = [255 - cc, 255, 0, 255]; | |
416 | } | |
417 | for (var i = 0; i < 168; i++) { | |
418 | var cc = Math.floor(i * 255 / 167); | |
419 | palette[93 + i] = [0, 255, cc, 255]; | |
420 | } | |
421 | for (var i = 0; i < 298; i++) { | |
422 | var cc = Math.floor(i * 255 / 297); | |
423 | palette[261 + i] = [0, 255 - cc, 255, 255]; | |
424 | } | |
425 | for (var i = 0; i < 465; i++) { | |
426 | var cc = Math.floor(i * 255 / 464); | |
427 | palette[559 + i] = [cc, 0, 255, 255]; | |
428 | } | |
429 | palette[1024] = [0, 0, 0, 255]; | |
430 | break; | |
6a7aa57d RK |
431 | } |
432 | return palette; | |
433 | } | |
434 | ||
435 | function drawPoint(context, img_x, img_y, C, iterMax, algorithm) { | |
436 | var itVal; | |
437 | switch (algorithm) { | |
438 | case 'oo': | |
439 | itVal = mandelbrotValueOO(C, iterMax); | |
440 | break; | |
441 | case 'numeric': | |
442 | default: | |
443 | itVal = mandelbrotValueNumeric(C, iterMax); | |
444 | break; | |
445 | } | |
446 | return getColor(itVal, iterMax); | |
447 | } | |
448 | ||
449 | // ########## UI functions ########## | |
450 | ||
becdac35 RK |
451 | var zoomstart; |
452 | var imgBackup; | |
453 | var zoomTouchID; | |
454 | ||
455 | var imgEvHandler = { | |
456 | handleEvent: function(aEvent) { | |
457 | var canvas = document.getElementById("mbrotImage"); | |
458 | var context = canvas.getContext("2d"); | |
459 | var touchEvent = aEvent.type.indexOf('touch') != -1; | |
460 | ||
461 | // Bail out if this is neither a touch nor left-click. | |
462 | if (!touchEvent && aEvent.button != 0) | |
463 | return; | |
464 | ||
465 | // Bail out if the started touch can't be found. | |
466 | if (touchEvent && zoomstart && | |
467 | !aEvent.changedTouches.identifiedTouch(zoomTouchID)) | |
468 | return; | |
469 | ||
470 | var coordObj = touchEvent ? | |
471 | aEvent.changedTouches.identifiedTouch(zoomTouchID) : | |
472 | aEvent; | |
473 | ||
474 | switch (aEvent.type) { | |
475 | case 'mousedown': | |
476 | case 'touchstart': | |
477 | if (touchEvent) { | |
478 | zoomTouchID = aEvent.changedTouches.item(0).identifier; | |
479 | coordObj = aEvent.changedTouches.identifiedTouch(zoomTouchID); | |
480 | } | |
481 | // left button - start dragzoom | |
482 | zoomstart = {x: coordObj.clientX - canvas.offsetLeft, | |
483 | y: coordObj.clientY - canvas.offsetTop}; | |
484 | imgBackup = context.getImageData(0, 0, canvas.width, canvas.height); | |
485 | break; | |
486 | case 'mouseup': | |
487 | case 'touchend': | |
488 | if (zoomstart) { | |
489 | context.putImageData(imgBackup, 0, 0); | |
490 | var zoomend = {x: coordObj.clientX - canvas.offsetLeft, | |
491 | y: coordObj.clientY - canvas.offsetTop}; | |
492 | ||
493 | // make sure zoomend is bigger than zoomstart | |
494 | if ((zoomend.x == zoomstart.x) || (zoomend.y == zoomstart.y)) { | |
495 | // cannot zoom what has no area, discard it | |
496 | zoomstart = undefined; | |
497 | return; | |
498 | } | |
499 | if (zoomend.x < zoomstart.x) | |
500 | [zoomend.x, zoomstart.x] = [zoomstart.x, zoomend.x]; | |
501 | if (zoomend.y < zoomstart.y) | |
502 | [zoomend.y, zoomstart.y] = [zoomstart.y, zoomend.y]; | |
503 | ||
95d05599 RK |
504 | if (gCurrentImageData) { |
505 | // determine new "coordinates" | |
506 | var CWidth = gCurrentImageData.C_max.r - gCurrentImageData.C_min.r; | |
507 | var CHeight = gCurrentImageData.C_max.i - gCurrentImageData.C_min.i; | |
508 | var newC_min = new complex( | |
509 | gCurrentImageData.C_min.r + zoomstart.x / gCurrentImageData.iWidth * CWidth, | |
510 | gCurrentImageData.C_min.i + zoomstart.y / gCurrentImageData.iHeight * CHeight); | |
511 | var newC_max = new complex( | |
512 | gCurrentImageData.C_min.r + zoomend.x / gCurrentImageData.iWidth * CWidth, | |
513 | gCurrentImageData.C_min.i + zoomend.y / gCurrentImageData.iHeight * CHeight); | |
514 | } | |
515 | else { | |
516 | var newC_min = new complex(-2, -1.5); | |
517 | var newC_max = new complex(1, 1.5); | |
518 | } | |
becdac35 RK |
519 | |
520 | adjustCoordsAndDraw(newC_min, newC_max); | |
521 | } | |
522 | zoomstart = undefined; | |
523 | break; | |
524 | case 'mousemove': | |
525 | case 'touchmove': | |
526 | if (zoomstart) { | |
527 | context.putImageData(imgBackup, 0, 0); | |
528 | context.strokeStyle = "rgb(255,255,31)"; | |
529 | context.strokeRect(zoomstart.x, zoomstart.y, | |
530 | coordObj.clientX - canvas.offsetLeft - zoomstart.x, | |
531 | coordObj.clientY - canvas.offsetTop - zoomstart.y); | |
532 | } | |
95d05599 | 533 | break; |
becdac35 RK |
534 | } |
535 | } | |
536 | }; | |
537 | ||
95d05599 RK |
538 | function drawIfEmpty() { |
539 | if (!gCurrentImageData) { | |
540 | drawImage(); | |
541 | } | |
542 | } | |
543 | ||
6a7aa57d RK |
544 | function toggleSettings() { |
545 | var fs = document.getElementById("settings"); | |
546 | if (fs.style.display != "block") { | |
547 | fs.style.display = "block"; | |
548 | } | |
549 | else { | |
550 | fs.style.display = "none"; | |
551 | } | |
becdac35 RK |
552 | } |
553 | ||
554 | function goBack() { | |
555 | if (gLastImageData) { | |
556 | document.getElementById("iterMax").value = gLastImageData.iterMax; | |
557 | // use gLastImageData.iWidth, gLastImageData.iHeight ??? | |
558 | adjustCoordsAndDraw(gLastImageData.C_min, gLastImageData.C_max); | |
559 | gLastImageData = undefined; | |
95d05599 | 560 | document.getElementById("backButton").disabled = true; |
becdac35 RK |
561 | } |
562 | } | |
563 | ||
564 | function setIter(aIter) { | |
565 | document.getElementById("iterMax").value = aIter; | |
566 | } | |
567 | ||
568 | function setPalette(aPaletteID) { | |
569 | document.getElementById("palette").value = aPaletteID; | |
570 | gColorPalette = getColorPalette(aPaletteID); | |
571 | } | |
572 | ||
573 | function setAlgorithm(algoID) { | |
574 | //document.getElementById("algorithm").value = algoID; | |
575 | } |