80 lines
2.0 KiB
C
80 lines
2.0 KiB
C
/*
|
|
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 "gfx.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();
|
|
|
|
/* 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;
|
|
}
|
|
}
|
|
|