diff options
| author | Joel Bodenmann <joel.bodenmann@hevs.ch> | 2012-10-25 15:40:17 +0200 |
|---|---|---|
| committer | Joel Bodenmann <joel.bodenmann@hevs.ch> | 2012-10-25 15:40:17 +0200 |
| commit | c15b2b42002977321bd1e2071189bc72044a452a (patch) | |
| tree | 97e1fcbd57ce186d87cfa075e4c7f56dc8b66ae8 /demos/mandelbrot/main.c | |
| parent | 6c23777b5b121cb294ee87eac2b2b89f987f241e (diff) | |
| download | uGFX-c15b2b42002977321bd1e2071189bc72044a452a.tar.gz uGFX-c15b2b42002977321bd1e2071189bc72044a452a.tar.bz2 uGFX-c15b2b42002977321bd1e2071189bc72044a452a.zip | |
updated mandelbrot demo
Diffstat (limited to 'demos/mandelbrot/main.c')
| -rw-r--r-- | demos/mandelbrot/main.c | 40 |
1 files changed, 38 insertions, 2 deletions
diff --git a/demos/mandelbrot/main.c b/demos/mandelbrot/main.c index c0c699ed..0c8dc47d 100644 --- a/demos/mandelbrot/main.c +++ b/demos/mandelbrot/main.c @@ -22,17 +22,53 @@ #include "hal.h"
#include "gdisp.h"
+void mandelbrot(float x1, float y1, float x2, float y2) {
+ unsigned int i,j;
+ uint16_t iter;
+ color_t color;
+
+ float sy = y2 - y1;
+ float sx = x2 - x1;
+ const int MAX = 512;
+
+ for(i = 0; i < 320; i++) {
+ for(j = 0; j < 240; j++) {
+ float cy = j * sy / 240.0f + y1;
+ float cx = i * sx / 320.0f + 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 = RGB565CONVERT(iter*4, iter*13, iter*10);
+ gdispDrawPixel(i, j, color);
+ }
+ }
+}
+
int main(void) {
+ float cx, cy;
+ float zoom = 1.0f;
+
halInit();
chSysInit();
gdispInit();
gdispSetOrientation(GDISP_ROTATE_270);
- mandelbrotInit(128, 128, 512);
+ /* 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;
}
}
|