1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
/*
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;
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);
/* 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;
}
}
|
