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/*
* dithering libcaca dithering test program
* Copyright (c) 2003 Sam Hocevar <sam@zoy.org>
* All Rights Reserved
*
* $Id: dithering.c 213 2004-01-05 18:17:20Z sam $
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This program 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307 USA
*/
#include "config.h"
#include "caca.h"
#define XRATIO 100*100
#define YRATIO 70*70
#define FUZZY 5000000
enum caca_color points[] =
{
CACA_COLOR_BLACK,
CACA_COLOR_DARKGRAY,
CACA_COLOR_LIGHTGRAY,
CACA_COLOR_WHITE,
CACA_COLOR_RED,
CACA_COLOR_LIGHTRED
};
char density[] = " -,+:;o&%w$W@#";
int main(void)
{
int neara, dista, nearb, distb, dist;
int x, y;
caca_init();
for(x = 0; x < 100; x++)
for(y = 0; y < 100; y++)
{
char ch = '?';
/* distance to black */
dista = XRATIO * x * x;
neara = 0;
/* distance to 40% */
dist = XRATIO * (x - 40) * (x - 40) + YRATIO * y * y;
if(caca_rand(-FUZZY, FUZZY) + dist < dista)
{
nearb = neara; distb = dista; neara = 1; dista = dist;
}
else
{
nearb = 1; distb = dist;
}
/* check dist to 70% */
dist = XRATIO * (x - 70) * (x - 70) + YRATIO * y * y;
if(caca_rand(-FUZZY, FUZZY) + dist < dista)
{
nearb = neara; distb = dista; neara = 2; dista = dist;
}
else if(caca_rand(-FUZZY, FUZZY) + dist < distb)
{
nearb = 2; distb = dist;
}
/* check dist to white */
dist = XRATIO * (x - 100) * (x - 100) + YRATIO * y * y;
if(caca_rand(-FUZZY, FUZZY) + dist < dista)
{
nearb = neara; distb = dista; neara = 3; dista = dist;
}
else if(caca_rand(-FUZZY, FUZZY) + dist < distb)
{
nearb = 3; distb = dist;
}
#if 1
/* check dist to dark */
dist = XRATIO * (x - 40) * (x - 40) + YRATIO * (y - 100) * (y - 100);
dist = dist * 12 / 16;
if(caca_rand(-FUZZY, FUZZY) + dist < dista)
{
nearb = neara; distb = dista; neara = 4; dista = dist;
}
else if(caca_rand(-FUZZY, FUZZY) + dist < distb)
{
nearb = 4; distb = dist;
}
/* check dist to light */
dist = XRATIO * (x - 100) * (x - 100) + YRATIO * (y - 100) * (y - 100);
dist = dist * 8 / 16;
if(caca_rand(-FUZZY, FUZZY) + dist < dista)
{
nearb = neara; distb = dista; neara = 5; dista = dist;
}
else if(caca_rand(-FUZZY, FUZZY) + dist < distb)
{
nearb = 5; distb = dist;
}
#endif
/* dista can be > distb because of dithering fuzziness */
if(dista > distb)
ch = density[distb * 2 * 13 / (dista + distb)];
else
ch = density[dista * 2 * 13 / (dista + distb)];
caca_set_color(points[nearb], points[neara]);
caca_putchar(x * caca_get_width() / 100, (100 - y) * caca_get_height() / 100, ch);
}
caca_refresh();
while(!caca_get_event(CACA_EVENT_KEY_PRESS));
caca_end();
return 0;
}
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