1 | /* |
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2 | * dithering libcaca dithering test program |
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3 | * Copyright (c) 2003 Sam Hocevar <sam@zoy.org> |
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4 | * All Rights Reserved |
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5 | * |
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6 | * $Id: dithering.c 815 2006-04-18 16:17:14Z sam $ |
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7 | * |
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8 | * This program is free software; you can redistribute it and/or |
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9 | * modify it under the terms of the Do What The Fuck You Want To |
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10 | * Public License, Version 2, as published by Sam Hocevar. See |
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11 | * http://sam.zoy.org/wtfpl/COPYING for more details. |
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12 | */ |
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13 | |
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14 | #include "config.h" |
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15 | |
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16 | #include "cucul.h" |
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17 | #include "caca.h" |
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18 | |
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19 | #define XRATIO 100*100 |
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20 | #define YRATIO 70*70 |
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21 | #define FUZZY 5000000 |
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22 | |
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23 | unsigned int points[] = |
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24 | { |
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25 | CUCUL_COLOR_BLACK, |
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26 | CUCUL_COLOR_DARKGRAY, |
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27 | CUCUL_COLOR_LIGHTGRAY, |
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28 | CUCUL_COLOR_WHITE, |
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29 | CUCUL_COLOR_RED, |
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30 | CUCUL_COLOR_LIGHTRED |
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31 | }; |
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32 | |
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33 | char density[] = " ',+:;o&%w$W@#"; |
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34 | |
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35 | int main(void) |
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36 | { |
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37 | caca_event_t ev; |
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38 | cucul_canvas_t *cv; |
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39 | caca_display_t *dp; |
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40 | int neara, dista, nearb, distb, dist; |
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41 | int x, y; |
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42 | |
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43 | cv = cucul_create_canvas(0, 0); |
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44 | dp = caca_attach(cv); |
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45 | |
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46 | for(x = 0; x < 100; x++) |
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47 | for(y = 0; y < 100; y++) |
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48 | { |
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49 | char ch = '?'; |
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50 | |
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51 | /* distance to black */ |
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52 | dista = XRATIO * x * x; |
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53 | neara = 0; |
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54 | |
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55 | /* distance to 40% */ |
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56 | dist = XRATIO * (x - 40) * (x - 40) + YRATIO * y * y; |
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57 | if(cucul_rand(-FUZZY, FUZZY+1) + dist < dista) |
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58 | { |
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59 | nearb = neara; distb = dista; neara = 1; dista = dist; |
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60 | } |
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61 | else |
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62 | { |
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63 | nearb = 1; distb = dist; |
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64 | } |
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65 | |
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66 | /* check dist to 70% */ |
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67 | dist = XRATIO * (x - 70) * (x - 70) + YRATIO * y * y; |
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68 | if(cucul_rand(-FUZZY, FUZZY+1) + dist < dista) |
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69 | { |
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70 | nearb = neara; distb = dista; neara = 2; dista = dist; |
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71 | } |
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72 | else if(cucul_rand(-FUZZY, FUZZY+1) + dist < distb) |
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73 | { |
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74 | nearb = 2; distb = dist; |
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75 | } |
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76 | |
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77 | /* check dist to white */ |
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78 | dist = XRATIO * (x - 100) * (x - 100) + YRATIO * y * y; |
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79 | if(cucul_rand(-FUZZY, FUZZY+1) + dist < dista) |
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80 | { |
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81 | nearb = neara; distb = dista; neara = 3; dista = dist; |
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82 | } |
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83 | else if(cucul_rand(-FUZZY, FUZZY+1) + dist < distb) |
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84 | { |
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85 | nearb = 3; distb = dist; |
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86 | } |
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87 | |
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88 | #if 1 |
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89 | /* check dist to dark */ |
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90 | dist = XRATIO * (x - 40) * (x - 40) + YRATIO * (y - 100) * (y - 100); |
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91 | dist = dist * 12 / 16; |
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92 | if(cucul_rand(-FUZZY, FUZZY+1) + dist < dista) |
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93 | { |
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94 | nearb = neara; distb = dista; neara = 4; dista = dist; |
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95 | } |
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96 | else if(cucul_rand(-FUZZY, FUZZY+1) + dist < distb) |
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97 | { |
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98 | nearb = 4; distb = dist; |
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99 | } |
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100 | |
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101 | /* check dist to light */ |
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102 | dist = XRATIO * (x - 100) * (x - 100) + YRATIO * (y - 100) * (y - 100); |
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103 | dist = dist * 8 / 16; |
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104 | if(cucul_rand(-FUZZY, FUZZY+1) + dist < dista) |
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105 | { |
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106 | nearb = neara; distb = dista; neara = 5; dista = dist; |
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107 | } |
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108 | else if(cucul_rand(-FUZZY, FUZZY+1) + dist < distb) |
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109 | { |
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110 | nearb = 5; distb = dist; |
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111 | } |
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112 | #endif |
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113 | |
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114 | /* dista can be > distb because of dithering fuzziness */ |
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115 | if(dista > distb) |
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116 | ch = density[distb * 2 * 13 / (dista + distb)]; |
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117 | else |
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118 | ch = density[dista * 2 * 13 / (dista + distb)]; |
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119 | cucul_set_color(cv, points[nearb], points[neara]); |
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120 | |
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121 | cucul_putchar(cv, x * cucul_get_canvas_width(cv) / 100, |
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122 | (100 - y) * cucul_get_canvas_height(cv) / 100, ch); |
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123 | } |
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124 | |
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125 | caca_display(dp); |
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126 | |
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127 | caca_get_event(dp, CACA_EVENT_KEY_PRESS, &ev, -1); |
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128 | |
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129 | caca_detach(dp); |
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130 | cucul_free_canvas(cv); |
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131 | |
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132 | return 0; |
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133 | } |
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134 | |
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