82 lines
2.7 KiB
C
82 lines
2.7 KiB
C
/*
|
|
* Copyright (c) 2012, 2013, Joel Bodenmann aka Tectu <joel@unormal.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* * Neither the name of the <organization> nor the
|
|
* names of its contributors may be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
|
|
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
|
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#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;
|
|
|
|
gfxInit();
|
|
|
|
/* 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;
|
|
}
|
|
}
|
|
|