source: libcaca/trunk/examples/dithering.c @ 4333

Last change on this file since 4333 was 4333, checked in by Sam Hocevar, 10 years ago

Large source code cleanup, getting rid of spaces, tabs, and svn keywords.

  • Property svn:keywords set to Id
File size: 3.7 KB
Line 
1/*
2 *  dithering     libcaca dithering test program
3 *  Copyright (c) 2003 Sam Hocevar <sam@hocevar.net>
4 *                All Rights Reserved
5 *
6 *  This program is free software. It comes without any warranty, to
7 *  the extent permitted by applicable law. You can redistribute it
8 *  and/or modify it under the terms of the Do What The Fuck You Want
9 *  To Public License, Version 2, as published by Sam Hocevar. See
10 *  http://sam.zoy.org/wtfpl/COPYING for more details.
11 */
12
13#include "config.h"
14
15#if !defined(__KERNEL__)
16#   include <stdio.h>
17#endif
18
19#include "caca.h"
20
21#define XRATIO 100*100
22#define YRATIO 70*70
23#define FUZZY 5000000
24
25unsigned int points[] =
26{
27    CACA_BLACK, CACA_DARKGRAY, CACA_LIGHTGRAY,
28    CACA_WHITE, CACA_RED, CACA_LIGHTRED
29};
30
31char density[] = " ',+:;o&%w$W@#";
32
33int main(int argc, char *argv[])
34{
35    caca_canvas_t *cv;
36    caca_display_t *dp;
37    int neara, dista, nearb, distb, dist;
38    int x, y;
39
40    cv = caca_create_canvas(80, 24);
41    if(cv == NULL)
42    {
43        printf("Failed to create canvas\n");
44        return 1;
45    }
46
47    dp = caca_create_display(cv);
48    if(dp == NULL)
49    {
50        printf("Failed to create display\n");
51        return 1;
52    }
53
54
55
56    for(x = 0; x < 100; x++)
57        for(y = 0; y < 100; y++)
58    {
59        char ch = '?';
60
61        /* distance to black */
62        dista = XRATIO * x * x;
63        neara = 0;
64
65        /* distance to 40% */
66        dist = XRATIO * (x - 40) * (x - 40) + YRATIO * y * y;
67        if(caca_rand(-FUZZY, FUZZY+1) + dist < dista)
68        {
69            nearb = neara; distb = dista; neara = 1; dista = dist;
70        }
71        else
72        {
73            nearb = 1; distb = dist;
74        }
75
76        /* check dist to 70% */
77        dist = XRATIO * (x - 70) * (x - 70) + YRATIO * y * y;
78        if(caca_rand(-FUZZY, FUZZY+1) + dist < dista)
79        {
80            nearb = neara; distb = dista; neara = 2; dista = dist;
81        }
82        else if(caca_rand(-FUZZY, FUZZY+1) + dist < distb)
83        {
84            nearb = 2; distb = dist;
85        }
86
87        /* check dist to white */
88        dist = XRATIO * (x - 100) * (x - 100) + YRATIO * y * y;
89        if(caca_rand(-FUZZY, FUZZY+1) + dist < dista)
90        {
91            nearb = neara; distb = dista; neara = 3; dista = dist;
92        }
93        else if(caca_rand(-FUZZY, FUZZY+1) + dist < distb)
94        {
95            nearb = 3; distb = dist;
96        }
97
98#if 1
99        /* check dist to dark */
100        dist = XRATIO * (x - 40) * (x - 40) + YRATIO * (y - 100) * (y - 100);
101        dist = dist * 12 / 16;
102        if(caca_rand(-FUZZY, FUZZY+1) + dist < dista)
103        {
104            nearb = neara; distb = dista; neara = 4; dista = dist;
105        }
106        else if(caca_rand(-FUZZY, FUZZY+1) + dist < distb)
107        {
108            nearb = 4; distb = dist;
109        }
110
111        /* check dist to light */
112        dist = XRATIO * (x - 100) * (x - 100) + YRATIO * (y - 100) * (y - 100);
113        dist = dist * 8 / 16;
114        if(caca_rand(-FUZZY, FUZZY+1) + dist < dista)
115        {
116            nearb = neara; distb = dista; neara = 5; dista = dist;
117        }
118        else if(caca_rand(-FUZZY, FUZZY+1) + dist < distb)
119        {
120            nearb = 5; distb = dist;
121        }
122#endif
123
124        /* dista can be > distb because of dithering fuzziness */
125        if(dista > distb)
126            ch = density[distb * 2 * 13 / (dista + distb)];
127        else
128            ch = density[dista * 2 * 13 / (dista + distb)];
129        caca_set_color_ansi(cv, points[nearb], points[neara]);
130
131        caca_put_char(cv, x * caca_get_canvas_width(cv) / 100,
132                          (100 - y) * caca_get_canvas_height(cv) / 100, ch);
133    }
134
135    caca_refresh_display(dp);
136
137    caca_get_event(dp, CACA_EVENT_KEY_PRESS, NULL, -1);
138
139    caca_free_display(dp);
140    caca_free_canvas(cv);
141
142    return 0;
143}
144
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