--- /dev/null
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is KaiRo.at Mandelbrot, XULRunner version.
+ *
+ * The Initial Developer of the Original Code is
+ * Robert Kaiser <kairo@kairo.at>.
+ * Portions created by the Initial Developer are Copyright (C) 2008-210
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ * Robert Kaiser <kairo@kairo.at>
+ * Boris Zbarsky <bzbarsky@mit.edu>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+var gColorPalette = [];
+var gStartTime = 0;
+
+function drawImage() {
+ var canvas = document.getElementById("mbrotImage");
+ var context = canvas.getContext("2d");
+
+ document.getElementById("calcTime").textContent = "--";
+
+ gColorPalette = getColorPalette(document.getElementById("palette").value);
+
+ var Cr_min = -2.0;
+ var Cr_max = 1.0;
+ try {
+ Cr_min = parseFloat(document.getElementById("Cr_min").value);
+ Cr_max = parseFloat(document.getElementById("Cr_max").value);
+ }
+ catch (e) { }
+ if ((Cr_min < -2) || (Cr_min > 2) ||
+ (Cr_max < -2) || (Cr_max > 2) || (Cr_min >= Cr_max)) {
+ Cr_min = -2.0; Cr_max = 1.0;
+ }
+ document.getElementById("Cr_min").value = Cr_min;
+ document.getElementById("Cr_max").value = Cr_max;
+
+ var Ci_min = -1.5;
+ var Ci_max = 1.5;
+ try {
+ Ci_min = parseFloat(document.getElementById("Ci_min").value);
+ Ci_max = parseFloat(document.getElementById("Ci_max").value);
+ }
+ catch (e) { }
+ if ((Ci_min < -2) || (Ci_min > 2) ||
+ (Ci_max < -2) || (Ci_max > 2) || (Ci_min >= Ci_max)) {
+ Ci_min = -1.5; Ci_max = 1.5;
+ }
+ document.getElementById("Ci_min").value = Ci_min;
+ document.getElementById("Ci_max").value = Ci_max;
+
+ //var algorithm = gPref.getCharPref("mandelbrot.use_algorithm");
+ var iterMax = parseInt(document.getElementById("iterMax").value);
+ var algorithm = "numeric"; //"oo"
+
+ var iWidth = canvas.width;
+ if ((iWidth < 10) || (iWidth > 5000)) {
+ iWidth = 300;
+ canvas.width = iWidth;
+ }
+ var iHeight = canvas.height;
+ if ((iHeight < 10) || (iHeight > 5000)) {
+ iHeight = 300;
+ canvas.height = iHeight;
+ }
+
+ context.fillStyle = "rgba(255, 255, 255, 127)";
+ context.fillRect(0, 0, canvas.width, canvas.height);
+
+ gStartTime = new Date();
+
+ drawLine(0, [Cr_min, Cr_max, Ci_min, Ci_max],
+ canvas, context, iterMax, algorithm);
+}
+
+function drawLine(line, dimensions, canvas, context, iterMax, algorithm) {
+ var Cr_min = dimensions[0];
+ var Cr_max = dimensions[1];
+ var Cr_scale = Cr_max - Cr_min;
+
+ var Ci_min = dimensions[2];
+ var Ci_max = dimensions[3];
+ var Ci_scale = Ci_max - Ci_min;
+
+ var lines = Math.min(canvas.height - line, 8);
+ var imageData = context.createImageData(canvas.width, lines);
+ var pixels = imageData.data;
+ var idx = 0;
+ for (var img_y = line; img_y < canvas.height && img_y < line+8; img_y++)
+ for (var img_x = 0; img_x < canvas.width; img_x++) {
+ var C = new complex(Cr_min + (img_x / canvas.width) * Cr_scale,
+ Ci_min + (img_y / canvas.height) * Ci_scale);
+ var colors = drawPoint(context, img_x, img_y, C, iterMax, algorithm);
+ pixels[idx++] = colors[0];
+ pixels[idx++] = colors[1];
+ pixels[idx++] = colors[2];
+ pixels[idx++] = colors[3];
+ }
+ context.putImageData(imageData, 0, line);
+
+ if (img_y < canvas.height)
+ setTimeout(drawLine, 0, img_y, dimensions, canvas, context, iterMax, algorithm);
+ else if (gStartTime)
+ EndCalc();
+}
+
+function EndCalc() {
+ var endTime = new Date();
+ var timeUsed = (endTime.getTime() - gStartTime.getTime()) / 1000;
+ document.getElementById("calcTime").textContent = timeUsed.toFixed(3) + " seconds";
+}
+
+function complex(aReal, aImag) {
+ this.r = aReal;
+ this.i = aImag;
+}
+complex.prototype = {
+ square: function() {
+ return new complex(this.r * this.r - this.i * this.i,
+ 2 * this.r * this.i);
+ },
+ dist: function() {
+ return Math.sqrt(this.r * this.r + this.i * this.i);
+ },
+ add: function(aComplex) {
+ return new complex(this.r + aComplex.r, this.i + aComplex.i);
+ }
+}
+
+function mandelbrotValueOO (aC, aIterMax) {
+ // this would be nice code in general but it looks like JS objects are too heavy for normal use.
+ var Z = new complex(0.0, 0.0);
+ for (var iter = 0; iter < aIterMax; iter++) {
+ Z = Z.square().add(aC);
+ if (Z.r * Z.r + Z.i * Z.i > 256) { break; }
+ }
+ return iter;
+}
+
+function mandelbrotValueNumeric (aC, aIterMax) {
+ // optimized numeric code for fast calculation
+ var Cr = aC.r, Ci = aC.i;
+ var Zr = 0.0, Zi = 0.0;
+ var Zr2 = Zr * Zr, Zi2 = Zi * Zi;
+ for (var iter = 0; iter < aIterMax; iter++) {
+ Zi = 2 * Zr * Zi + Ci;
+ Zr = Zr2 - Zi2 + Cr;
+
+ Zr2 = Zr * Zr; Zi2 = Zi * Zi;
+ if (Zr2 + Zi2 > 256) { break; }
+ }
+ return iter;
+}
+
+function getColor(aIterValue, aIterMax) {
+ var standardizedValue = Math.round(aIterValue * 1024 / aIterMax);
+ if (gColorPalette && gColorPalette.length)
+ return gColorPalette[standardizedValue];
+
+ // fallback to simple b/w if for some reason we don't have a palette
+ if (aIterValue == aIterMax)
+ return [0, 0, 0, 255];
+ else
+ return [255, 255, 255, 255];
+}
+
+function getColorPalette(palName) {
+ var palette = [];
+ switch (palName) {
+ case 'bw':
+ for (var i = 0; i < 1024; i++) {
+ palette[i] = [255, 255, 255, 255];
+ }
+ palette[1024] = [0, 0, 0, 255];
+ break;
+ case 'kairo':
+ // outer areas
+ for (var i = 0; i < 32; i++) {
+ var cc1 = Math.floor(i * 127 / 31);
+ var cc2 = 170 - Math.floor(i * 43 / 31);
+ palette[i] = [cc1, cc2, cc1, 255];
+ }
+ // inner areas
+ for (var i = 0; i < 51; i++) {
+ var cc = Math.floor(i * 170 / 50);
+ palette[32 + i] = [cc, 0, (170-cc), 255];
+ }
+ // corona
+ for (var i = 0; i < 101; i++) {
+ var cc = Math.floor(i * 200 / 100);
+ palette[83 + i] = [255, cc, 0, 255];
+ }
+ // inner corona
+ for (var i = 0; i < 201; i++) {
+ var cc1 = 255 - Math.floor(i * 85 / 200);
+ var cc2 = 200 - Math.floor(i * 30 / 200);
+ var cc3 = Math.floor(i * 170 / 200);
+ palette[184 + i] = [cc1, cc2, cc3, 255];
+ }
+ for (var i = 0; i < 301; i++) {
+ var cc1 = 170 - Math.floor(i * 43 / 300);
+ var cc2 = 170 + Math.floor(i * 85 / 300);
+ palette[385 + i] = [cc1, cc1, cc2, 255];
+ }
+ for (var i = 0; i < 338; i++) {
+ var cc = 127 + Math.floor(i * 128 / 337);
+ palette[686 + i] = [cc, cc, 255, 255];
+ }
+ palette[1024] = [0, 0, 0, 255];
+ break;
+ case 'rainbow-linear1':
+ for (var i = 0; i < 256; i++) {
+ palette[i] = [i, 0, 0, 255];
+ palette[256 + i] = [255, i, 0, 255];
+ palette[512 + i] = [255 - i, 255, i, 255];
+ palette[768 + i] = [i, 255-i, 255, 255];
+ }
+ palette[1024] = [0, 0, 0, 255];
+ break;
+ }
+ return palette;
+}
+
+function drawPoint(context, img_x, img_y, C, iterMax, algorithm) {
+ var itVal;
+ switch (algorithm) {
+ case 'oo':
+ itVal = mandelbrotValueOO(C, iterMax);
+ break;
+ case 'numeric':
+ default:
+ itVal = mandelbrotValueNumeric(C, iterMax);
+ break;
+ }
+ return getColor(itVal, iterMax);
+}
+
+// ########## UI functions ##########
+
+function toggleSettings() {
+ var fs = document.getElementById("settings");
+ if (fs.style.display != "block") {
+ fs.style.display = "block";
+ }
+ else {
+ fs.style.display = "none";
+ }
+}
\ No newline at end of file
projects / mandelbrot-web.git / commitdiff
