145 lines
3.7 KiB
C
145 lines
3.7 KiB
C
/*
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* dithering libcaca dithering test program
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* Copyright (c) 2003-2012 Sam Hocevar <sam@hocevar.net>
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* All Rights Reserved
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*
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* This program is free software. It comes without any warranty, to
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* the extent permitted by applicable law. You can redistribute it
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* and/or modify it under the terms of the Do What the Fuck You Want
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* to Public License, Version 2, as published by Sam Hocevar. See
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* http://www.wtfpl.net/ for more details.
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*/
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#include "config.h"
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#if !defined(__KERNEL__)
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# include <stdio.h>
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#endif
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#include "caca.h"
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#define XRATIO 100*100
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#define YRATIO 70*70
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#define FUZZY 5000000
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unsigned int points[] =
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{
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CACA_BLACK, CACA_DARKGRAY, CACA_LIGHTGRAY,
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CACA_WHITE, CACA_RED, CACA_LIGHTRED
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};
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char density[] = " ',+:;o&%w$W@#";
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int main(int argc, char *argv[])
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{
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caca_canvas_t *cv;
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caca_display_t *dp;
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int neara, dista, nearb, distb, dist;
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int x, y;
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cv = caca_create_canvas(80, 24);
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if(cv == NULL)
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{
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printf("Failed to create canvas\n");
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return 1;
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}
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dp = caca_create_display(cv);
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if(dp == NULL)
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{
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printf("Failed to create display\n");
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return 1;
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}
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for(x = 0; x < 100; x++)
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for(y = 0; y < 100; y++)
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{
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char ch = '?';
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/* distance to black */
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dista = XRATIO * x * x;
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neara = 0;
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/* distance to 40% */
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dist = XRATIO * (x - 40) * (x - 40) + YRATIO * y * y;
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if(caca_rand(-FUZZY, FUZZY+1) + dist < dista)
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{
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nearb = neara; distb = dista; neara = 1; dista = dist;
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}
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else
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{
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nearb = 1; distb = dist;
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}
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/* check dist to 70% */
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dist = XRATIO * (x - 70) * (x - 70) + YRATIO * y * y;
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if(caca_rand(-FUZZY, FUZZY+1) + dist < dista)
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{
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nearb = neara; distb = dista; neara = 2; dista = dist;
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}
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else if(caca_rand(-FUZZY, FUZZY+1) + dist < distb)
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{
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nearb = 2; distb = dist;
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}
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/* check dist to white */
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dist = XRATIO * (x - 100) * (x - 100) + YRATIO * y * y;
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if(caca_rand(-FUZZY, FUZZY+1) + dist < dista)
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{
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nearb = neara; distb = dista; neara = 3; dista = dist;
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}
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else if(caca_rand(-FUZZY, FUZZY+1) + dist < distb)
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{
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nearb = 3; distb = dist;
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}
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#if 1
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/* check dist to dark */
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dist = XRATIO * (x - 40) * (x - 40) + YRATIO * (y - 100) * (y - 100);
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dist = dist * 12 / 16;
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if(caca_rand(-FUZZY, FUZZY+1) + dist < dista)
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{
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nearb = neara; distb = dista; neara = 4; dista = dist;
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}
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else if(caca_rand(-FUZZY, FUZZY+1) + dist < distb)
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{
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nearb = 4; distb = dist;
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}
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/* check dist to light */
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dist = XRATIO * (x - 100) * (x - 100) + YRATIO * (y - 100) * (y - 100);
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dist = dist * 8 / 16;
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if(caca_rand(-FUZZY, FUZZY+1) + dist < dista)
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{
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nearb = neara; distb = dista; neara = 5; dista = dist;
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}
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else if(caca_rand(-FUZZY, FUZZY+1) + dist < distb)
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{
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nearb = 5; distb = dist;
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}
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#endif
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/* dista can be > distb because of dithering fuzziness */
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if(dista > distb)
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ch = density[distb * 2 * 13 / (dista + distb)];
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else
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ch = density[dista * 2 * 13 / (dista + distb)];
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caca_set_color_ansi(cv, points[nearb], points[neara]);
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caca_put_char(cv, x * caca_get_canvas_width(cv) / 100,
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(100 - y) * caca_get_canvas_height(cv) / 100, ch);
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}
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caca_refresh_display(dp);
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caca_get_event(dp, CACA_EVENT_KEY_PRESS, NULL, -1);
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caca_free_display(dp);
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caca_free_canvas(cv);
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return 0;
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}
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