75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
/*
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ChibiOS/GFX - Copyright (C) 2012
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Joel Bodenmann aka Tectu <joel@unormal.org>
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This file is part of ChibiOS/GFX.
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ChibiOS/GFX is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/GFX is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "ch.h"
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#include "hal.h"
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#include "gdisp.h"
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void mandelbrot(float x1, float y1, float x2, float y2) {
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unsigned int i,j;
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uint16_t iter;
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color_t color;
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float sy = y2 - y1;
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float sx = x2 - x1;
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const int MAX = 512;
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for(i = 0; i < 320; i++) {
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for(j = 0; j < 240; j++) {
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float cy = j * sy / 240.0f + y1;
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float cx = i * sx / 320.0f + x1;
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float x=0.0f, y=0.0f, xx=0.0f, yy=0.0f;
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for(iter=0; iter <= MAX && xx+yy<4.0f; iter++) {
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xx = x*x;
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yy = y*y;
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y = 2.0f*x*y + cy;
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x = xx - yy + cx;
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}
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color = ((iter << 8) | (iter&0xFF));
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//color = RGB565CONVERT(iter*4, iter*13, iter*10);
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gdispDrawPixel(i, j, color);
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}
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}
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}
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int main(void) {
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float cx, cy;
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float zoom = 1.0f;
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halInit();
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chSysInit();
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gdispInit();
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gdispSetOrientation(GDISP_ROTATE_270);
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/* where to zoom in */
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cx = -0.086f;
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cy = 0.85f;
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while(TRUE) {
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mandelbrot(-2.0f*zoom+cx, -1.5f*zoom+cy, 2.0f*zoom+cx, 1.5f*zoom+cy);
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zoom *= 0.7f;
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if(zoom <= 0.00001f)
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zoom = 1.0f;
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}
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}
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