Commit | Line | Data |
---|---|---|
37b05b56 RK |
1 | var gColorPalette = getColorPalette('kairo'); |
2 | ||
3 | function drawImage() { | |
8a9c8e3f | 4 | let canvas = document.getElementById("mbrotImage"); |
37b05b56 | 5 | if (canvas.getContext) { |
8a9c8e3f | 6 | let context = canvas.getContext("2d"); |
37b05b56 RK |
7 | |
8 | // example: | |
9 | // context.fillStyle = "rgb(200,0,0)"; | |
10 | // context.fillRect (10, 10, 55, 50); // x, y, width, height | |
11 | // | |
12 | // context.fillStyle = "rgba(0, 0, 200, 0.5)"; | |
13 | // context.fillRect (30, 30, 55, 50); | |
14 | ||
8a9c8e3f RK |
15 | let Cr_min = -2.0; |
16 | let Cr_max = 1.0; | |
17 | let Cr_scale = Cr_max - Cr_min; | |
37b05b56 | 18 | |
8a9c8e3f RK |
19 | let Ci_min = -1.5; |
20 | let Ci_max = 1.5; | |
21 | let Ci_scale = Ci_max - Ci_min; | |
37b05b56 | 22 | |
8a9c8e3f | 23 | let iterMax = 500; |
37b05b56 | 24 | |
8a9c8e3f RK |
25 | for (let img_x = 0; img_x < canvas.width; img_x++) { |
26 | for (let img_y = 0; img_y < canvas.height; img_y++) { | |
27 | let C = new complex(Cr_min + (img_x / canvas.width) * Cr_scale, | |
37b05b56 RK |
28 | Ci_min + (img_y / canvas.height) * Ci_scale); |
29 | window.setTimeout(drawPoint, 0, context, img_x, img_y, C, iterMax); | |
30 | } | |
31 | } | |
32 | } | |
33 | } | |
34 | ||
35 | function complex(aReal, aImag) { | |
36 | this.r = aReal; | |
37 | this.i = aImag; | |
38 | this.square = function() { | |
39 | return new complex(this.r * this.r - this.i * this.i, | |
40 | 2 * this.r * this.i); | |
41 | } | |
42 | this.dist = function() { | |
43 | return Math.sqrt(this.r * this.r + this.i * this.i); | |
44 | } | |
45 | this.add = function(aComplex) { | |
46 | return new complex(this.r + aComplex.r, this.i + aComplex.i); | |
47 | } | |
48 | } | |
49 | ||
50 | function mandelbrotValue (aC, aIterMax) { | |
8444612a RK |
51 | /* XXX: this would be nice code but it looks like JS objects are too heavy for this. |
52 | let Z = new complex(0.0, 0.0); | |
37b05b56 RK |
53 | for (var iter = 0; iter < aIterMax; iter++) { |
54 | Z = Z.square().add(aC); | |
55 | if (Z.r * Z.r + Z.i * Z.i > 256) { break; } | |
56 | } | |
8444612a RK |
57 | */ |
58 | ||
59 | // highly optimized code for fast calculation | |
60 | let Cr = aC.r, Ci = aC.i; | |
61 | let Zr = 0.0, Zi = 0.0; | |
62 | let Zr2 = Zr * Zr, Zi2 = Zi * Zi; | |
63 | for (var iter = 0; iter < aIterMax; iter++) { | |
64 | Zi = 2 * Zr * Zi + Ci; | |
65 | Zr = Zr2 - Zi2 + Cr; | |
66 | ||
67 | Zr2 = Zr * Zr; Zi2 = Zi * Zi; | |
68 | if (Zr2 + Zi2 > 256) { break; } | |
69 | } | |
37b05b56 RK |
70 | return iter; |
71 | } | |
72 | ||
73 | function getColor(aIterValue, aIterMax) { | |
8a9c8e3f | 74 | let standardizedValue = Math.round(aIterValue * 1024 / aIterMax); |
37b05b56 RK |
75 | return gColorPalette[standardizedValue]; |
76 | if (aIterValue == aIterMax) { | |
77 | return "rgb(0,0,0)"; | |
78 | } | |
79 | else { | |
80 | //return "rgb(" + img_x + "," + img_y + ",0)"; | |
81 | return "rgb(255,255,255)"; | |
82 | } | |
83 | } | |
84 | ||
85 | function getColorPalette(palName) { | |
86 | var palette = []; | |
87 | switch (palName) { | |
88 | case 'bw': | |
8a9c8e3f | 89 | for (let i = 0; i < 1024; i++) { |
37b05b56 RK |
90 | palette[i] = 'rgb(255,255,255)'; |
91 | } | |
92 | palette[1024] = 'rgb(0,0,0)'; | |
93 | break; | |
94 | case 'kairo': | |
95 | // outer areas | |
8a9c8e3f RK |
96 | for (let i = 0; i < 32; i++) { |
97 | let cc1 = Math.floor(i * 127 / 31); | |
98 | let cc2 = 170 - Math.floor(i * 43 / 31); | |
37b05b56 RK |
99 | palette[i] = 'rgb(' + cc1 + ',' + cc2 + ',' + cc1 + ')'; |
100 | } | |
101 | // inner areas | |
8a9c8e3f RK |
102 | for (let i = 0; i < 51; i++) { |
103 | let cc = Math.floor(i * 170 / 50); | |
37b05b56 RK |
104 | palette[32 + i] = 'rgb(' + cc + ',0,' + (170 + cc) + ')'; |
105 | } | |
106 | // corona | |
8a9c8e3f RK |
107 | for (let i = 0; i < 101; i++) { |
108 | let cc = Math.floor(i * 200 / 100); | |
37b05b56 RK |
109 | palette[83 + i] = 'rgb(255,' + cc + ',0)'; |
110 | } | |
111 | // inner corona | |
8a9c8e3f RK |
112 | for (let i = 0; i < 201; i++) { |
113 | let cc1 = 255 - Math.floor(i * 85 / 200); | |
114 | let cc2 = 200 - Math.floor(i * 30 / 200); | |
115 | let cc3 = Math.floor(i * 170 / 200); | |
37b05b56 RK |
116 | palette[184 + i] = 'rgb(' + cc1 + ',' + cc2 + ',' + cc3 + ')'; |
117 | } | |
8a9c8e3f RK |
118 | for (let i = 0; i < 301; i++) { |
119 | let cc1 = 170 - Math.floor(i * 43 / 300); | |
120 | let cc2 = 170 + Math.floor(i * 85 / 300); | |
37b05b56 RK |
121 | palette[385 + i] = 'rgb(' + cc1 + ',' + cc1 + ',' + cc2 + ')'; |
122 | } | |
8a9c8e3f RK |
123 | for (let i = 0; i < 338; i++) { |
124 | let cc = 127 + Math.floor(i * 128 / 337); | |
37b05b56 RK |
125 | palette[686 + i] = 'rgb(' + cc + ',' + cc + ',255)'; |
126 | } | |
127 | palette[1024] = 'rgb(0,0,0)'; | |
128 | break; | |
129 | case 'rainbow-linear1': | |
8a9c8e3f | 130 | for (let i = 0; i < 256; i++) { |
37b05b56 RK |
131 | palette[i] = 'rgb(' + i + ',0,0)'; |
132 | palette[256 + i] = 'rgb(255,' + i + ',0)'; | |
133 | palette[512 + i] = 'rgb(' + (255 - i) + ',255,' + i + ')'; | |
134 | palette[768 + i] = 'rgb(' + i + ',' + (255 - i) + ',255)'; | |
135 | } | |
136 | palette[1024] = 'rgb(0,0,0)'; | |
137 | break; | |
138 | } | |
139 | /* | |
140 | Select Case palnr | |
141 | Case 1 'Standard-Palette (QB-Colors) | |
142 | For i = 0 To 1024 | |
143 | xx = CInt(i * 500 / 1024 + 2) | |
144 | If xx <= 15 Then clr = xx | |
145 | If xx > 15 Then clr = CInt(Sqr((xx - 15 + 1) * 15 ^ 2 / 485)) | |
146 | If xx >= 500 Then clr = 0 | |
147 | palette(i) = QBColor(clr) | |
148 | Next | |
149 | Case 3 'Regenbogen-Palette 1 (qu.) | |
150 | For i = 0 To 33 | |
151 | clr = CInt(i * 255 / 33) | |
152 | palette(i) = RGB(clr, 0, 0) | |
153 | Next | |
154 | For i = 0 To 136 | |
155 | clr = CInt(i * 255 / 136) | |
156 | palette(34 + i) = RGB(255, clr, 0) | |
157 | Next | |
158 | For i = 0 To 306 | |
159 | clr = CInt(i * 255 / 306) | |
160 | palette(171 + i) = RGB(255 - clr, 255, clr) | |
161 | Next | |
162 | For i = 0 To 545 | |
163 | clr = CInt(i * 255 / 545) | |
164 | palette(478 + i) = RGB(clr, 255 - clr, 255) | |
165 | Next | |
166 | Case 4 'Regenbogen-Palette 2 (linear) | |
167 | For i = 0 To 204 | |
168 | clr = CInt(i * 255 / 204) | |
169 | palette(i) = RGB(255, clr, 0) | |
170 | palette(204 + i) = RGB(255 - clr, 255, 0) | |
171 | palette(409 + i) = RGB(0, 255, clr) | |
172 | palette(614 + i) = RGB(0, 255 - clr, 255) | |
173 | palette(819 + i) = RGB(clr, 0, 255) | |
174 | Next | |
175 | Case 5 'Regenbogen-Palette 2 (qu.) | |
176 | For i = 0 To 18 | |
177 | clr = CInt(i * 255 / 18) | |
178 | palette(i) = RGB(255, clr, 0) | |
179 | Next | |
180 | For i = 0 To 73 | |
181 | clr = CInt(i * 255 / 73) | |
182 | palette(20 + i) = RGB(255 - clr, 255, 0) | |
183 | Next | |
184 | For i = 0 To 167 | |
185 | clr = CInt(i * 255 / 167) | |
186 | palette(93 + i) = RGB(0, 255, clr) | |
187 | Next | |
188 | For i = 0 To 297 | |
189 | clr = CInt(i * 255 / 297) | |
190 | palette(261 + i) = RGB(0, 255 - clr, 255) | |
191 | Next | |
192 | For i = 0 To 464 | |
193 | clr = CInt(i * 255 / 464) | |
194 | palette(559 + i) = RGB(clr, 0, 255) | |
195 | Next | |
196 | */ | |
197 | return palette; | |
198 | } | |
199 | ||
200 | function drawPoint(context, img_x, img_y, C, iterMax) { | |
8a9c8e3f | 201 | let itVal = mandelbrotValue(C, iterMax); |
37b05b56 RK |
202 | context.fillStyle = getColor(itVal, iterMax); |
203 | context.fillRect (img_x, img_y, 1, 1); // x, y, width, height | |
204 | } | |
205 | ||
206 | function saveImage() { | |
207 | // should call filepicker! | |
208 | saveCanvas(document.getElementById("mbrotImage"), "/home/robert/temp/canvas-save.png") | |
209 | } | |
210 | ||
211 | // function below is from from http://developer.mozilla.org/en/docs/Code_snippets:Canvas | |
212 | function saveCanvas(canvas, destFile) { | |
213 | // convert string filepath to an nsIFile | |
214 | var file = Components.classes["@mozilla.org/file/local;1"] | |
215 | .createInstance(Components.interfaces.nsILocalFile); | |
216 | file.initWithPath(destFile); | |
217 | ||
218 | // create a data url from the canvas and then create URIs of the source and targets | |
219 | var io = Components.classes["@mozilla.org/network/io-service;1"] | |
220 | .getService(Components.interfaces.nsIIOService); | |
221 | var source = io.newURI(canvas.toDataURL("image/png", ""), "UTF8", null); | |
222 | var target = io.newFileURI(file); | |
223 | ||
224 | // prepare to save the canvas data | |
225 | var persist = Components.classes["@mozilla.org/embedding/browser/nsWebBrowserPersist;1"] | |
226 | .createInstance(Components.interfaces.nsIWebBrowserPersist); | |
227 | ||
228 | persist.persistFlags = Components.interfaces.nsIWebBrowserPersist.PERSIST_FLAGS_REPLACE_EXISTING_FILES; | |
229 | persist.persistFlags |= Components.interfaces.nsIWebBrowserPersist.PERSIST_FLAGS_AUTODETECT_APPLY_CONVERSION; | |
230 | ||
231 | // displays a download dialog (remove these 3 lines for silent download) | |
232 | var xfer = Components.classes["@mozilla.org/transfer;1"] | |
233 | .createInstance(Components.interfaces.nsITransfer); | |
234 | xfer.init(source, target, "", null, null, null, persist); | |
235 | persist.progressListener = xfer; | |
236 | ||
237 | // save the canvas data to the file | |
238 | persist.saveURI(source, null, null, null, null, file); | |
239 | } | |
240 | ||
241 | // function below is from http://developer.mozilla.org/en/docs/How_to_Quit_a_XUL_Application | |
242 | function quitApp(aForceQuit) { | |
243 | var appStartup = Components.classes['@mozilla.org/toolkit/app-startup;1'] | |
244 | .getService(Components.interfaces.nsIAppStartup); | |
245 | ||
246 | // eAttemptQuit will try to close each XUL window, but the XUL window can cancel the quit | |
247 | // process if there is unsaved data. eForceQuit will quit no matter what. | |
248 | var quitSeverity = aForceQuit ? Components.interfaces.nsIAppStartup.eForceQuit : | |
249 | Components.interfaces.nsIAppStartup.eAttemptQuit; | |
250 | appStartup.quit(quitSeverity); | |
251 | } |