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| author | Joel Bodenmann <joel@unormal.org> | 2012-11-20 18:37:49 +0100 |
|---|---|---|
| committer | Joel Bodenmann <joel@unormal.org> | 2012-11-20 18:37:49 +0100 |
| commit | 43d45dca63e8e098e8a40481411d0c4ca46564c5 (patch) | |
| tree | f395cf3409123d5d96f3950550c711fd4b140aff /demos/applications/mandelbrot/main.c | |
| parent | 802e967a7abc8dd40ed35993e885db50f0f8c930 (diff) | |
| download | uGFX-43d45dca63e8e098e8a40481411d0c4ca46564c5.tar.gz uGFX-43d45dca63e8e098e8a40481411d0c4ca46564c5.tar.bz2 uGFX-43d45dca63e8e098e8a40481411d0c4ca46564c5.zip | |
gtimer demo
Diffstat (limited to 'demos/applications/mandelbrot/main.c')
| -rw-r--r-- | demos/applications/mandelbrot/main.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/demos/applications/mandelbrot/main.c b/demos/applications/mandelbrot/main.c new file mode 100644 index 00000000..6ab19de1 --- /dev/null +++ b/demos/applications/mandelbrot/main.c @@ -0,0 +1,80 @@ +/*
+ ChibiOS/GFX - Copyright (C) 2012
+ Joel Bodenmann aka Tectu <joel@unormal.org>
+
+ This file is part of ChibiOS/GFX.
+
+ ChibiOS/GFX is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ ChibiOS/GFX is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "ch.h"
+#include "hal.h"
+#include "gdisp.h"
+
+void mandelbrot(float x1, float y1, float x2, float y2) {
+ unsigned int i,j, width, height;
+ uint16_t iter;
+ color_t color;
+ float fwidth, fheight;
+
+ float sy = y2 - y1;
+ float sx = x2 - x1;
+ const int MAX = 512;
+
+ width = (unsigned int)gdispGetWidth();
+ height = (unsigned int)gdispGetHeight();
+ fwidth = width;
+ fheight = height;
+
+ for(i = 0; i < width; i++) {
+ for(j = 0; j < height; j++) {
+ float cy = j * sy / fheight + y1;
+ float cx = i * sx / fwidth + x1;
+ float x=0.0f, y=0.0f, xx=0.0f, yy=0.0f;
+ for(iter=0; iter <= MAX && xx+yy<4.0f; iter++) {
+ xx = x*x;
+ yy = y*y;
+ y = 2.0f*x*y + cy;
+ x = xx - yy + cx;
+ }
+ //color = ((iter << 8) | (iter&0xFF));
+ color = RGB2COLOR(iter<<7, iter<<4, iter);
+ gdispDrawPixel(i, j, color);
+ }
+ }
+}
+
+int main(void) {
+ float cx, cy;
+ float zoom = 1.0f;
+
+ halInit();
+ chSysInit();
+
+ gdispInit();
+ gdispSetOrientation(GDISP_ROTATE_270);
+
+ /* where to zoom in */
+ cx = -0.086f;
+ cy = 0.85f;
+
+ while(TRUE) {
+ mandelbrot(-2.0f*zoom+cx, -1.5f*zoom+cy, 2.0f*zoom+cx, 1.5f*zoom+cy);
+
+ zoom *= 0.7f;
+ if(zoom <= 0.00001f)
+ zoom = 1.0f;
+ }
+}
+
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