1 | /* |
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2 | * demo demo for libcaca |
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3 | * Copyright (c) 2003-2009 Sam Hocevar <sam@hocevar.net> |
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4 | * All Rights Reserved |
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5 | * |
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6 | * This program is free software. It comes without any warranty, to |
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7 | * the extent permitted by applicable law. You can redistribute it |
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8 | * and/or modify it under the terms of the Do What The Fuck You Want |
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9 | * To Public License, Version 2, as published by Sam Hocevar. See |
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10 | * http://sam.zoy.org/wtfpl/COPYING for more details. |
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11 | */ |
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12 | |
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13 | #include "config.h" |
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14 | |
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15 | #if !defined(__KERNEL__) |
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16 | # include <math.h> |
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17 | # include <string.h> |
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18 | # include <stdio.h> |
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19 | #endif |
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20 | |
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21 | #ifndef M_PI |
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22 | # define M_PI 3.14159265358979323846 |
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23 | #endif |
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24 | |
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25 | #include "caca.h" |
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26 | |
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27 | static void display_menu(void); |
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28 | |
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29 | static void demo_all(void); |
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30 | |
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31 | static void demo_dots(void); |
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32 | static void demo_lines(void); |
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33 | static void demo_boxes(void); |
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34 | static void demo_ellipses(void); |
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35 | static void demo_triangles(void); |
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36 | /*static void demo_sprites(void);*/ |
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37 | static void demo_render(void); |
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38 | |
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39 | int bounds = 0; |
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40 | int outline = 0; |
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41 | int dithering = 0; |
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42 | #if 0 |
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43 | caca_sprite_t *sprite = NULL; |
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44 | #endif |
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45 | |
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46 | caca_canvas_t *cv; |
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47 | caca_display_t *dp; |
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48 | |
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49 | int main(int argc, char **argv) |
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50 | { |
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51 | void (*demo)(void) = NULL; |
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52 | int quit = 0; |
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53 | |
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54 | cv = caca_create_canvas(80, 24); |
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55 | if(cv == NULL) |
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56 | { |
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57 | printf("Failed to create canvas\n"); |
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58 | return 1; |
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59 | } |
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60 | |
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61 | dp = caca_create_display(cv); |
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62 | if(dp == NULL) |
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63 | { |
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64 | printf("Failed to create display\n"); |
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65 | return 1; |
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66 | } |
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67 | |
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68 | caca_set_display_time(dp, 40000); |
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69 | |
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70 | /* Initialize data */ |
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71 | #if 0 |
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72 | sprite = caca_load_sprite("caca.txt"); |
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73 | if(!sprite) |
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74 | sprite = caca_load_sprite("examples/caca.txt"); |
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75 | #endif |
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76 | |
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77 | /* Disable cursor */ |
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78 | caca_set_mouse(dp, 0); |
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79 | |
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80 | /* Main menu */ |
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81 | display_menu(); |
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82 | caca_refresh_display(dp); |
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83 | |
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84 | /* Go ! */ |
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85 | while(!quit) |
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86 | { |
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87 | caca_event_t ev; |
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88 | int menu = 0, mouse = 0, xmouse = 0, ymouse = 0; |
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89 | |
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90 | while(caca_get_event(dp, CACA_EVENT_ANY, &ev, 0)) |
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91 | { |
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92 | if(demo && (caca_get_event_type(&ev) & CACA_EVENT_KEY_PRESS)) |
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93 | { |
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94 | menu = 1; |
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95 | demo = NULL; |
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96 | } |
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97 | else if(caca_get_event_type(&ev) & CACA_EVENT_KEY_PRESS) |
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98 | { |
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99 | switch(caca_get_event_key_ch(&ev)) |
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100 | { |
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101 | case 'q': |
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102 | case 'Q': |
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103 | case CACA_KEY_ESCAPE: |
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104 | demo = NULL; |
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105 | quit = 1; |
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106 | break; |
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107 | case 'o': |
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108 | case 'O': |
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109 | outline = (outline + 1) % 3; |
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110 | display_menu(); |
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111 | caca_refresh_display(dp); |
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112 | break; |
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113 | case 'b': |
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114 | case 'B': |
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115 | bounds = (bounds + 1) % 2; |
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116 | display_menu(); |
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117 | caca_refresh_display(dp); |
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118 | break; |
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119 | #if 0 |
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120 | case 'd': |
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121 | case 'D': |
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122 | dithering = (dithering + 1) % 5; |
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123 | caca_set_feature(cv, dithering); |
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124 | display_menu(); |
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125 | caca_refresh_display(dp); |
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126 | break; |
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127 | #endif |
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128 | case 'f': |
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129 | case 'F': |
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130 | demo = demo_all; |
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131 | break; |
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132 | case '1': |
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133 | demo = demo_dots; |
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134 | break; |
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135 | case '2': |
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136 | demo = demo_lines; |
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137 | break; |
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138 | case '3': |
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139 | demo = demo_boxes; |
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140 | break; |
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141 | case '4': |
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142 | demo = demo_triangles; |
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143 | break; |
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144 | case '5': |
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145 | demo = demo_ellipses; |
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146 | break; |
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147 | #if 0 |
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148 | case 's': |
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149 | case 'S': |
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150 | if(sprite) |
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151 | demo = demo_sprites; |
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152 | break; |
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153 | #endif |
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154 | case 'r': |
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155 | case 'R': |
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156 | demo = demo_render; |
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157 | break; |
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158 | } |
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159 | |
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160 | if(demo) |
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161 | { |
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162 | caca_set_color_ansi(cv, CACA_LIGHTGRAY, CACA_BLACK); |
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163 | caca_clear_canvas(cv); |
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164 | } |
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165 | } |
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166 | else if(caca_get_event_type(&ev) & CACA_EVENT_MOUSE_MOTION) |
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167 | { |
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168 | mouse = 1; |
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169 | xmouse = caca_get_event_mouse_x(&ev); |
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170 | ymouse = caca_get_event_mouse_y(&ev); |
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171 | } |
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172 | else if(caca_get_event_type(&ev) & CACA_EVENT_RESIZE) |
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173 | { |
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174 | mouse = 1; /* old hack */ |
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175 | } |
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176 | } |
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177 | |
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178 | if(menu || (mouse && !demo)) |
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179 | { |
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180 | display_menu(); |
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181 | if(mouse && !demo) |
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182 | { |
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183 | caca_set_color_ansi(cv, CACA_RED, CACA_BLACK); |
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184 | caca_put_str(cv, xmouse, ymouse, "."); |
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185 | caca_put_str(cv, xmouse, ymouse + 1, "|\\"); |
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186 | } |
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187 | caca_refresh_display(dp); |
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188 | mouse = menu = 0; |
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189 | } |
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190 | else if(demo) |
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191 | { |
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192 | demo(); |
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193 | |
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194 | caca_set_color_ansi(cv, CACA_LIGHTGRAY, CACA_BLACK); |
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195 | caca_draw_thin_box(cv, 1, 1, caca_get_canvas_width(cv) - 2, |
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196 | caca_get_canvas_height(cv) - 2); |
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197 | caca_printf(cv, 4, 1, "[%i.%i fps]----", |
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198 | 1000000 / caca_get_display_time(dp), |
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199 | (10000000 / caca_get_display_time(dp)) % 10); |
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200 | caca_refresh_display(dp); |
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201 | } |
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202 | } |
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203 | |
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204 | /* Clean up */ |
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205 | #if 0 |
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206 | caca_free_sprite(sprite); |
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207 | #endif |
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208 | caca_free_display(dp); |
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209 | caca_free_canvas(cv); |
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210 | |
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211 | return 0; |
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212 | } |
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213 | |
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214 | static void display_menu(void) |
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215 | { |
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216 | int xo = caca_get_canvas_width(cv) - 2; |
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217 | int yo = caca_get_canvas_height(cv) - 2; |
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218 | |
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219 | caca_set_color_ansi(cv, CACA_LIGHTGRAY, CACA_BLACK); |
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220 | caca_clear_canvas(cv); |
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221 | caca_draw_thin_box(cv, 1, 1, xo, yo); |
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222 | |
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223 | caca_put_str(cv, (xo - strlen("libcaca demo")) / 2, 3, "libcaca demo"); |
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224 | caca_put_str(cv, (xo - strlen("==============")) / 2, 4, "=============="); |
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225 | |
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226 | caca_put_str(cv, 4, 6, "demos:"); |
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227 | caca_put_str(cv, 4, 7, "'f': full"); |
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228 | caca_put_str(cv, 4, 8, "'1': dots"); |
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229 | caca_put_str(cv, 4, 9, "'2': lines"); |
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230 | caca_put_str(cv, 4, 10, "'3': boxes"); |
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231 | caca_put_str(cv, 4, 11, "'4': triangles"); |
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232 | caca_put_str(cv, 4, 12, "'5': ellipses"); |
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233 | caca_put_str(cv, 4, 13, "'c': colour"); |
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234 | caca_put_str(cv, 4, 14, "'r': render"); |
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235 | #if 0 |
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236 | if(sprite) |
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237 | caca_put_str(cv, 4, 15, "'s': sprites"); |
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238 | #endif |
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239 | |
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240 | caca_put_str(cv, 4, 16, "settings:"); |
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241 | caca_printf(cv, 4, 17, "'o': outline: %s", |
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242 | outline == 0 ? "none" : outline == 1 ? "solid" : "thin"); |
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243 | caca_printf(cv, 4, 18, "'b': drawing boundaries: %s", |
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244 | bounds == 0 ? "screen" : "infinite"); |
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245 | //caca_printf(cv, 4, 19, "'d': dithering (%s)", |
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246 | // caca_get_feature_name(dithering)); |
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247 | |
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248 | caca_put_str(cv, 4, yo - 2, "'q': quit"); |
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249 | |
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250 | //caca_refresh_display(dp); |
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251 | } |
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252 | |
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253 | static void demo_all(void) |
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254 | { |
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255 | static int i = 0; |
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256 | |
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257 | int j, xo, yo, xa, ya, xb, yb, xc, yc; |
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258 | |
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259 | i++; |
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260 | |
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261 | caca_set_color_ansi(cv, CACA_LIGHTGRAY, CACA_BLACK); |
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262 | caca_clear_canvas(cv); |
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263 | |
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264 | /* Draw the sun */ |
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265 | caca_set_color_ansi(cv, CACA_YELLOW, CACA_BLACK); |
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266 | xo = caca_get_canvas_width(cv) / 4; |
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267 | yo = caca_get_canvas_height(cv) / 4 + 5 * sin(0.03*i); |
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268 | |
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269 | for(j = 0; j < 16; j++) |
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270 | { |
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271 | xa = xo - (30 + sin(0.03*i) * 8) * sin(0.03*i + M_PI*j/8); |
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272 | ya = yo + (15 + sin(0.03*i) * 4) * cos(0.03*i + M_PI*j/8); |
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273 | caca_draw_thin_line(cv, xo, yo, xa, ya); |
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274 | } |
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275 | |
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276 | j = 15 + sin(0.03*i) * 8; |
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277 | caca_set_color_ansi(cv, CACA_WHITE, CACA_BLACK); |
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278 | caca_fill_ellipse(cv, xo, yo, j, j / 2, '#'); |
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279 | caca_set_color_ansi(cv, CACA_YELLOW, CACA_BLACK); |
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280 | caca_draw_ellipse(cv, xo, yo, j, j / 2, '#'); |
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281 | |
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282 | /* Draw the pyramid */ |
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283 | xo = caca_get_canvas_width(cv) * 5 / 8; |
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284 | yo = 2; |
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285 | |
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286 | xa = caca_get_canvas_width(cv) / 8 + sin(0.03*i) * 5; |
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287 | ya = caca_get_canvas_height(cv) / 2 + cos(0.03*i) * 5; |
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288 | |
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289 | xb = caca_get_canvas_width(cv) - 10 - cos(0.02*i) * 10; |
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290 | yb = caca_get_canvas_height(cv) * 3 / 4 - 5 + sin(0.02*i) * 5; |
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291 | |
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292 | xc = caca_get_canvas_width(cv) / 4 - sin(0.02*i) * 5; |
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293 | yc = caca_get_canvas_height(cv) * 3 / 4 + cos(0.02*i) * 5; |
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294 | |
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295 | caca_set_color_ansi(cv, CACA_GREEN, CACA_BLACK); |
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296 | caca_fill_triangle(cv, xo, yo, xb, yb, xa, ya, '%'); |
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297 | caca_set_color_ansi(cv, CACA_YELLOW, CACA_BLACK); |
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298 | caca_draw_thin_triangle(cv, xo, yo, xb, yb, xa, ya); |
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299 | |
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300 | caca_set_color_ansi(cv, CACA_RED, CACA_BLACK); |
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301 | caca_fill_triangle(cv, xa, ya, xb, yb, xc, yc, '#'); |
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302 | caca_set_color_ansi(cv, CACA_YELLOW, CACA_BLACK); |
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303 | caca_draw_thin_triangle(cv, xa, ya, xb, yb, xc, yc); |
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304 | |
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305 | caca_set_color_ansi(cv, CACA_BLUE, CACA_BLACK); |
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306 | caca_fill_triangle(cv, xo, yo, xb, yb, xc, yc, '%'); |
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307 | caca_set_color_ansi(cv, CACA_YELLOW, CACA_BLACK); |
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308 | caca_draw_thin_triangle(cv, xo, yo, xb, yb, xc, yc); |
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309 | |
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310 | /* Draw a background triangle */ |
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311 | xa = 2; |
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312 | ya = 2; |
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313 | |
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314 | xb = caca_get_canvas_width(cv) - 3; |
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315 | yb = caca_get_canvas_height(cv) / 2; |
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316 | |
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317 | xc = caca_get_canvas_width(cv) / 3; |
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318 | yc = caca_get_canvas_height(cv) - 3; |
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319 | |
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320 | caca_set_color_ansi(cv, CACA_CYAN, CACA_BLACK); |
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321 | caca_draw_thin_triangle(cv, xa, ya, xb, yb, xc, yc); |
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322 | |
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323 | xo = caca_get_canvas_width(cv) / 2 + cos(0.027*i) * caca_get_canvas_width(cv) / 3; |
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324 | yo = caca_get_canvas_height(cv) / 2 - sin(0.027*i) * caca_get_canvas_height(cv) / 2; |
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325 | |
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326 | caca_draw_thin_line(cv, xa, ya, xo, yo); |
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327 | caca_draw_thin_line(cv, xb, yb, xo, yo); |
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328 | caca_draw_thin_line(cv, xc, yc, xo, yo); |
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329 | |
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330 | /* Draw a sprite on the pyramid */ |
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331 | #if 0 |
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332 | caca_draw_sprite(cv, xo, yo, sprite, 0); |
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333 | #endif |
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334 | |
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335 | /* Draw a trail behind the foreground sprite */ |
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336 | for(j = i - 60; j < i; j++) |
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337 | { |
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338 | int delta = caca_rand(-5, 6); |
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339 | caca_set_color_ansi(cv, caca_rand(0, 16), caca_rand(0, 16)); |
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340 | caca_put_char(cv, caca_get_canvas_width(cv) / 2 |
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341 | + cos(0.02*j) * (delta + caca_get_canvas_width(cv) / 4), |
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342 | caca_get_canvas_height(cv) / 2 |
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343 | + sin(0.02*j) * (delta + caca_get_canvas_height(cv) / 3), |
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344 | '#'); |
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345 | } |
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346 | |
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347 | /* Draw foreground sprite */ |
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348 | #if 0 |
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349 | caca_draw_sprite(cv, caca_get_canvas_width(cv) / 2 + cos(0.02*i) * caca_get_canvas_width(cv) / 4, |
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350 | caca_get_canvas_height(cv) / 2 + sin(0.02*i) * caca_get_canvas_height(cv) / 3, |
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351 | sprite, 0); |
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352 | #endif |
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353 | } |
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354 | |
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355 | static void demo_dots(void) |
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356 | { |
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357 | int xmax = caca_get_canvas_width(cv); |
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358 | int ymax = caca_get_canvas_height(cv); |
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359 | int i; |
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360 | static char chars[10] = |
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361 | { |
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362 | '+', '-', '*', '#', 'X', '@', '%', '$', 'M', 'W' |
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363 | }; |
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364 | |
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365 | for(i = 1000; i--;) |
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366 | { |
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367 | /* Putpixel */ |
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368 | caca_set_color_ansi(cv, caca_rand(0, 16), caca_rand(0, 16)); |
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369 | caca_put_char(cv, caca_rand(0, xmax), caca_rand(0, ymax), |
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370 | chars[caca_rand(0, 9)]); |
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371 | } |
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372 | } |
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373 | |
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374 | static void demo_lines(void) |
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375 | { |
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376 | int w = caca_get_canvas_width(cv); |
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377 | int h = caca_get_canvas_height(cv); |
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378 | int xa, ya, xb, yb; |
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379 | |
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380 | if(bounds) |
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381 | { |
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382 | xa = caca_rand(- w, 2 * w); ya = caca_rand(- h, 2 * h); |
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383 | xb = caca_rand(- w, 2 * w); yb = caca_rand(- h, 2 * h); |
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384 | } |
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385 | else |
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386 | { |
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387 | xa = caca_rand(0, w); ya = caca_rand(0, h); |
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388 | xb = caca_rand(0, w); yb = caca_rand(0, h); |
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389 | } |
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390 | |
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391 | caca_set_color_ansi(cv, caca_rand(0, 16), CACA_BLACK); |
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392 | if(outline > 1) |
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393 | caca_draw_thin_line(cv, xa, ya, xb, yb); |
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394 | else |
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395 | caca_draw_line(cv, xa, ya, xb, yb, '#'); |
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396 | } |
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397 | |
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398 | static void demo_boxes(void) |
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399 | { |
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400 | int w = caca_get_canvas_width(cv); |
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401 | int h = caca_get_canvas_height(cv); |
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402 | int xa, ya, xb, yb; |
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403 | |
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404 | if(bounds) |
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405 | { |
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406 | xa = caca_rand(- w, 2 * w); ya = caca_rand(- h, 2 * h); |
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407 | xb = caca_rand(- w, 2 * w); yb = caca_rand(- h, 2 * h); |
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408 | } |
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409 | else |
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410 | { |
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411 | xa = caca_rand(0, w); ya = caca_rand(0, h); |
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412 | xb = caca_rand(0, w); yb = caca_rand(0, h); |
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413 | } |
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414 | |
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415 | caca_set_color_ansi(cv, caca_rand(0, 16), caca_rand(0, 16)); |
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416 | caca_fill_box(cv, xa, ya, xb, yb, '#'); |
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417 | |
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418 | caca_set_color_ansi(cv, caca_rand(0, 16), CACA_BLACK); |
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419 | if(outline == 2) |
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420 | caca_draw_thin_box(cv, xa, ya, xb, yb); |
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421 | else if(outline == 1) |
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422 | caca_draw_box(cv, xa, ya, xb, yb, '#'); |
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423 | } |
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424 | |
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425 | static void demo_ellipses(void) |
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426 | { |
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427 | int w = caca_get_canvas_width(cv); |
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428 | int h = caca_get_canvas_height(cv); |
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429 | int x, y, a, b; |
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430 | |
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431 | if(bounds) |
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432 | { |
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433 | x = caca_rand(- w, 2 * w); y = caca_rand(- h, 2 * h); |
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434 | a = caca_rand(0, w); b = caca_rand(0, h); |
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435 | } |
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436 | else |
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437 | { |
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438 | do |
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439 | { |
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440 | x = caca_rand(0, w); y = caca_rand(0, h); |
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441 | a = caca_rand(0, w); b = caca_rand(0, h); |
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442 | |
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443 | } while(x - a < 0 || x + a >= w || y - b < 0 || y + b >= h); |
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444 | } |
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445 | |
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446 | caca_set_color_ansi(cv, caca_rand(0, 16), caca_rand(0, 16)); |
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447 | caca_fill_ellipse(cv, x, y, a, b, '#'); |
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448 | |
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449 | caca_set_color_ansi(cv, caca_rand(0, 16), CACA_BLACK); |
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450 | if(outline == 2) |
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451 | caca_draw_thin_ellipse(cv, x, y, a, b); |
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452 | else if(outline == 1) |
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453 | caca_draw_ellipse(cv, x, y, a, b, '#'); |
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454 | } |
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455 | |
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456 | static void demo_triangles(void) |
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457 | { |
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458 | int w = caca_get_canvas_width(cv); |
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459 | int h = caca_get_canvas_height(cv); |
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460 | int xa, ya, xb, yb, xc, yc; |
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461 | |
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462 | if(bounds) |
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463 | { |
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464 | xa = caca_rand(- w, 2 * w); ya = caca_rand(- h, 2 * h); |
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465 | xb = caca_rand(- w, 2 * w); yb = caca_rand(- h, 2 * h); |
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466 | xc = caca_rand(- w, 2 * w); yc = caca_rand(- h, 2 * h); |
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467 | } |
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468 | else |
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469 | { |
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470 | |
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471 | xa = caca_rand(0, w); ya = caca_rand(0, h); |
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472 | xb = caca_rand(0, w); yb = caca_rand(0, h); |
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473 | xc = caca_rand(0, w); yc = caca_rand(0, h); |
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474 | } |
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475 | |
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476 | caca_set_color_ansi(cv, caca_rand(0, 16), caca_rand(0, 16)); |
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477 | caca_fill_triangle(cv, xa, ya, xb, yb, xc, yc, '#'); |
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478 | |
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479 | caca_set_color_ansi(cv, caca_rand(0, 16), CACA_BLACK); |
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480 | if(outline == 2) |
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481 | caca_draw_thin_triangle(cv, xa, ya, xb, yb, xc, yc); |
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482 | else if(outline == 1) |
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483 | caca_draw_triangle(cv, xa, ya, xb, yb, xc, yc, '#'); |
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484 | } |
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485 | #if 0 |
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486 | static void demo_sprites(void) |
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487 | { |
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488 | |
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489 | caca_draw_sprite(cv, caca_rand(0, caca_get_canvas_width(cv)), |
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490 | caca_rand(0, caca_get_canvas_height(cv)), sprite, 0); |
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491 | |
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492 | } |
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493 | #endif |
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494 | #if 0 |
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495 | static void demo_render(void) |
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496 | { |
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497 | caca_dither_t *dither; |
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498 | //short buffer[256*256]; |
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499 | //short *dest = buffer; |
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500 | int buffer[256*256]; |
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501 | int *dest = buffer; |
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502 | int x, y, z; |
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503 | static int i = 0; |
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504 | |
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505 | i = (i + 1) % 512; |
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506 | z = i < 256 ? i : 511 - i; |
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507 | |
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508 | for(x = 0; x < 256; x++) |
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509 | for(y = 0; y < 256; y++) |
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510 | { |
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511 | //*dest++ = ((x >> 3) << 11) | ((y >> 2) << 5) | ((z >> 3)); |
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512 | *dest++ = (x << 16) | (y << 8) | (z); |
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513 | } |
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514 | caca_set_dither_invert(dither, 1); |
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515 | //dither = caca_create_dither(16, 256, 256, 2 * 256, 0xf800, 0x07e0, 0x001f, 0x0000); |
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516 | dither = caca_create_dither(32, 256, 256, 4 * 256, 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000); |
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517 | caca_dither_bitmap(cv, 0, 0, caca_get_canvas_width(cv), caca_get_canvas_height(cv), |
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518 | dither, buffer); |
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519 | caca_free_dither(dither); |
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520 | } |
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521 | #endif |
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522 | |
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523 | static void draw_circle(int *buffer, int xo, int yo, int r, int mask, int val); |
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524 | |
---|
525 | static void demo_render(void) |
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526 | { |
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527 | caca_dither_t *dither; |
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528 | int buffer[256*256]; |
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529 | int *dest; |
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530 | int x, y, z, xo, yo; |
---|
531 | static int i = 0; |
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532 | |
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533 | i++; |
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534 | |
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535 | dest = buffer; |
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536 | for(x = 0; x < 256; x++) |
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537 | for(y = 0; y < 256; y++) |
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538 | { |
---|
539 | *dest++ = 0xff000000; |
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540 | } |
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541 | |
---|
542 | /* red */ |
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543 | xo = 128 + 48 * sin(0.02 * i); |
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544 | yo = 128 + 48 * cos(0.03 * i); |
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545 | for(z = 0; z < 240; z++) |
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546 | draw_circle(buffer, xo, yo, z, 0x00ff0000, 200 << 16); |
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547 | |
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548 | /* green */ |
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549 | xo = 128 + 48 * sin(2 + 0.06 * i); |
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550 | yo = 128 + 48 * cos(2 + 0.05 * i); |
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551 | for(z = 0; z < 240; z++) |
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552 | draw_circle(buffer, xo, yo, z, 0x0000ff00, 200 << 8); |
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553 | |
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554 | /* blue */ |
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555 | xo = 128 + 48 * sin(1 + 0.04 * i); |
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556 | yo = 128 + 48 * cos(1 + 0.03 * i); |
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557 | for(z = 0; z < 240; z++) |
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558 | draw_circle(buffer, xo, yo, z, 0x000000ff, 200); |
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559 | |
---|
560 | dither = caca_create_dither(32, 256, 256, 4 * 256, 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000); |
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561 | caca_set_dither_gamma(dither, -1.0); |
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562 | caca_dither_bitmap(cv, 0, 0, caca_get_canvas_width(cv), caca_get_canvas_height(cv), dither, (char *)buffer); |
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563 | caca_free_dither(dither); |
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564 | } |
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565 | |
---|
566 | static void draw_circle(int *buffer, int x, int y, int r, int mask, int val) |
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567 | { |
---|
568 | int t, dx, dy; |
---|
569 | |
---|
570 | #define POINT(X,Y) \ |
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571 | buffer[(X) + 256 * (Y)] = 0xff000000 | (buffer[(X) + 256 * (Y)] & ~mask) | val; |
---|
572 | |
---|
573 | for(t = 0, dx = 0, dy = r; dx <= dy; dx++) |
---|
574 | { |
---|
575 | POINT(x - dx / 3, y - dy / 3); |
---|
576 | POINT(x + dx / 3, y - dy / 3); |
---|
577 | POINT(x - dx / 3, y + dy / 3); |
---|
578 | POINT(x + dx / 3, y + dy / 3); |
---|
579 | |
---|
580 | POINT(x - dy / 3, y - dx / 3); |
---|
581 | POINT(x + dy / 3, y - dx / 3); |
---|
582 | POINT(x - dy / 3, y + dx / 3); |
---|
583 | POINT(x + dy / 3, y + dx / 3); |
---|
584 | |
---|
585 | t += t > 0 ? dx - dy-- : dx; |
---|
586 | } |
---|
587 | } |
---|
588 | |
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