1 | /* |
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2 | * cacademo various demo effects for libcaca |
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3 | * Copyright (c) 1998 Michele Bini <mibin@tin.it> |
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4 | * 2004 Sam Hocevar <sam@zoy.org> |
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5 | * All Rights Reserved |
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6 | * |
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7 | * $Id: cacademo.c 1026 2006-09-16 12:57:41Z sam $ |
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8 | * |
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9 | * This program is free software; you can redistribute it and/or |
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10 | * modify it under the terms of the Do What The Fuck You Want To |
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11 | * Public License, Version 2, as published by Sam Hocevar. See |
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12 | * http://sam.zoy.org/wtfpl/COPYING for more details. |
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13 | */ |
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14 | |
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15 | #include "config.h" |
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16 | #include "common.h" |
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17 | |
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18 | #if !defined(__KERNEL__) |
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19 | # include <stdio.h> |
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20 | # include <string.h> |
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21 | # include <math.h> |
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22 | # ifndef M_PI |
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23 | # define M_PI 3.14159265358979323846 |
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24 | # endif |
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25 | #endif |
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26 | |
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27 | #include "cucul.h" |
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28 | #include "caca.h" |
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29 | |
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30 | /* Virtual buffer size for dither-based demos */ |
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31 | #define XSIZ 256 |
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32 | #define YSIZ 256 |
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33 | static unsigned char screen[XSIZ * YSIZ]; |
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34 | |
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35 | /* The plasma effect */ |
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36 | #define TABLEX (XSIZ * 2) |
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37 | #define TABLEY (YSIZ * 2) |
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38 | |
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39 | static unsigned char table[TABLEX * TABLEY]; |
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40 | |
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41 | static int main_plasma(int, char **); |
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42 | static void do_plasma(unsigned char *, |
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43 | double, double, double, double, double, double); |
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44 | |
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45 | /* The metaball effect */ |
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46 | #define METASIZE 128 |
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47 | #define METABALLS 12 |
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48 | #define CROPBALL 200 /* Colour index where to crop balls */ |
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49 | |
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50 | static int main_ball(int, char **); |
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51 | static void create_ball(void); |
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52 | static void draw_ball(unsigned int, unsigned int); |
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53 | |
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54 | static unsigned char metaball[METASIZE * METASIZE]; |
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55 | |
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56 | /* The moiré effect */ |
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57 | #define DISCSIZ 512 |
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58 | #define DISCTHICKNESS 96 |
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59 | |
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60 | static unsigned char disc[DISCSIZ * DISCSIZ]; |
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61 | |
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62 | static int main_moir(int, char **); |
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63 | static void put_disc(int, int); |
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64 | static void draw_disc(int, char); |
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65 | static void draw_line(int, int, char); |
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66 | |
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67 | int main(int argc, char **argv) |
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68 | { |
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69 | switch(cucul_rand(0, 3)) |
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70 | { |
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71 | case 0: |
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72 | return main_plasma(argc, argv); |
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73 | case 1: |
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74 | return main_ball(argc, argv); |
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75 | case 2: |
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76 | return main_moir(argc, argv); |
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77 | } |
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78 | |
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79 | return -1; |
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80 | } |
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81 | |
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82 | static int main_plasma(int argc, char **argv) |
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83 | { |
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84 | cucul_canvas_t *cv, *c2, *mask; caca_display_t *dp; |
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85 | unsigned int red[256], green[256], blue[256], alpha[256]; |
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86 | double r[3], R[6]; |
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87 | cucul_dither_t *dither; |
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88 | int i, x, y, frame = 0, pause = 0; |
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89 | |
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90 | cv = cucul_create_canvas(0, 0); |
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91 | if(!cv) |
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92 | return 1; |
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93 | dp = caca_create_display(cv); |
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94 | if(!dp) |
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95 | return 1; |
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96 | |
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97 | caca_set_display_time(dp, 20000); |
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98 | |
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99 | c2 = cucul_create_canvas(cucul_get_canvas_width(cv), |
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100 | cucul_get_canvas_height(cv)); |
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101 | mask = cucul_create_canvas(cucul_get_canvas_width(cv), |
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102 | cucul_get_canvas_height(cv)); |
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103 | |
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104 | /* Fill various tables */ |
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105 | for(i = 0 ; i < 256; i++) |
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106 | red[i] = green[i] = blue[i] = alpha[i] = 0; |
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107 | |
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108 | for(i = 0; i < 3; i++) |
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109 | r[i] = (double)(cucul_rand(1, 1000)) / 60000 * M_PI; |
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110 | |
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111 | for(i = 0; i < 6; i++) |
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112 | R[i] = (double)(cucul_rand(1, 1000)) / 10000; |
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113 | |
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114 | for(y = 0 ; y < TABLEY ; y++) |
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115 | for(x = 0 ; x < TABLEX ; x++) |
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116 | { |
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117 | double tmp = (((double)((x - (TABLEX / 2)) * (x - (TABLEX / 2)) |
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118 | + (y - (TABLEX / 2)) * (y - (TABLEX / 2)))) |
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119 | * (M_PI / (TABLEX * TABLEX + TABLEY * TABLEY))); |
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120 | |
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121 | table[x + y * TABLEX] = (1.0 + sin(12.0 * sqrt(tmp))) * 256 / 6; |
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122 | } |
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123 | |
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124 | /* Create a libcucul dither */ |
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125 | dither = cucul_create_dither(8, XSIZ, YSIZ, XSIZ, 0, 0, 0, 0); |
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126 | |
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127 | /* Main loop */ |
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128 | for(;;) |
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129 | { |
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130 | caca_event_t ev; |
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131 | if(caca_get_event(dp, CACA_EVENT_KEY_PRESS, &ev, 0)) |
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132 | { |
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133 | switch(ev.data.key.ch) |
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134 | { |
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135 | case CACA_KEY_ESCAPE: goto end; |
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136 | case ' ': pause = !pause; |
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137 | } |
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138 | } |
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139 | |
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140 | if(pause) |
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141 | goto paused; |
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142 | |
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143 | for(i = 0 ; i < 256; i++) |
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144 | { |
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145 | double z = ((double)i) / 256 * 6 * M_PI; |
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146 | |
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147 | red[i] = (1.0 + sin(z + r[1] * frame)) / 2 * 0xfff; |
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148 | blue[i] = (1.0 + cos(z + r[0] * frame)) / 2 * 0xfff; |
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149 | green[i] = (1.0 + cos(z + r[2] * frame)) / 2 * 0xfff; |
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150 | } |
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151 | |
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152 | /* Set the palette */ |
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153 | cucul_set_dither_palette(dither, red, green, blue, alpha); |
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154 | |
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155 | do_plasma(screen, |
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156 | (1.0 + sin(((double)frame) * R[0])) / 2, |
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157 | (1.0 + sin(((double)frame) * R[1])) / 2, |
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158 | (1.0 + sin(((double)frame) * R[2])) / 2, |
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159 | (1.0 + sin(((double)frame) * R[3])) / 2, |
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160 | (1.0 + sin(((double)frame) * R[4])) / 2, |
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161 | (1.0 + sin(((double)frame) * R[5])) / 2); |
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162 | frame++; |
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163 | |
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164 | paused: |
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165 | cucul_dither_bitmap(cv, 0, 0, |
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166 | cucul_get_canvas_width(cv), |
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167 | cucul_get_canvas_height(cv), |
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168 | dither, screen); |
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169 | |
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170 | cucul_blit(c2, 0, 0, cv, NULL); |
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171 | cucul_invert(c2); |
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172 | |
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173 | |
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174 | cucul_blit(cv, 0, 0, c2, mask); |
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175 | |
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176 | cucul_set_color(cv, CUCUL_COLOR_WHITE, CUCUL_COLOR_BLUE); |
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177 | cucul_putstr(cv, cucul_get_canvas_width(cv) - 30, |
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178 | cucul_get_canvas_height(cv) - 2, |
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179 | " -=[ Powered by libcaca ]=- "); |
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180 | caca_refresh_display(dp); |
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181 | } |
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182 | |
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183 | end: |
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184 | cucul_free_dither(dither); |
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185 | caca_free_display(dp); |
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186 | cucul_free_canvas(cv); |
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187 | |
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188 | return 0; |
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189 | } |
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190 | |
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191 | static void do_plasma(unsigned char *pixels, double x_1, double y_1, |
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192 | double x_2, double y_2, double x_3, double y_3) |
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193 | { |
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194 | unsigned int X1 = x_1 * (TABLEX / 2), |
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195 | Y1 = y_1 * (TABLEY / 2), |
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196 | X2 = x_2 * (TABLEX / 2), |
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197 | Y2 = y_2 * (TABLEY / 2), |
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198 | X3 = x_3 * (TABLEX / 2), |
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199 | Y3 = y_3 * (TABLEY / 2); |
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200 | unsigned int y; |
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201 | unsigned char * t1 = table + X1 + Y1 * TABLEX, |
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202 | * t2 = table + X2 + Y2 * TABLEX, |
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203 | * t3 = table + X3 + Y3 * TABLEX; |
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204 | |
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205 | for(y = 0; y < YSIZ; y++) |
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206 | { |
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207 | unsigned int x; |
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208 | unsigned char * tmp = pixels + y * YSIZ; |
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209 | unsigned int ty = y * TABLEX, tmax = ty + XSIZ; |
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210 | for(x = 0; ty < tmax; ty++, tmp++) |
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211 | tmp[0] = t1[ty] + t2[ty] + t3[ty]; |
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212 | } |
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213 | } |
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214 | |
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215 | static int main_ball(int argc, char **argv) |
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216 | { |
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217 | cucul_canvas_t *cv; caca_display_t *dp; |
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218 | unsigned int r[256], g[256], b[256], a[256]; |
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219 | float dd[METABALLS], di[METABALLS], dj[METABALLS], dk[METABALLS]; |
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220 | unsigned int x[METABALLS], y[METABALLS]; |
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221 | cucul_dither_t *cucul_dither; |
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222 | float i = 10.0, j = 17.0, k = 11.0; |
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223 | int p, frame = 0, pause = 0; |
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224 | double frameOffset[360 + 80]; |
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225 | |
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226 | cv = cucul_create_canvas(0, 0); |
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227 | if(!cv) |
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228 | return 1; |
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229 | dp = caca_create_display(cv); |
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230 | if(!dp) |
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231 | return 1; |
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232 | |
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233 | caca_set_display_time(dp, 20000); |
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234 | |
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235 | /* Make the palette eatable by libcaca */ |
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236 | for(p = 0; p < 256; p++) |
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237 | r[p] = g[p] = b[p] = a[p] = 0x0; |
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238 | r[255] = g[255] = b[255] = 0xfff; |
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239 | |
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240 | /* Create a libcucul dither smaller than our pixel buffer, so that we |
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241 | * display only the interesting part of it */ |
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242 | cucul_dither = cucul_create_dither(8, XSIZ - METASIZE, YSIZ - METASIZE, |
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243 | XSIZ, 0, 0, 0, 0); |
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244 | |
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245 | /* Generate ball sprite */ |
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246 | create_ball(); |
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247 | |
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248 | for(p = 0; p < METABALLS; p++) |
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249 | { |
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250 | dd[p] = cucul_rand(0, 100); |
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251 | di[p] = (float)cucul_rand(500, 4000) / 6000.0; |
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252 | dj[p] = (float)cucul_rand(500, 4000) / 6000.0; |
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253 | dk[p] = (float)cucul_rand(500, 4000) / 6000.0; |
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254 | } |
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255 | |
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256 | for(frame = 0; frame < 360 + 80; frame++) |
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257 | frameOffset[frame] = 1.0 + sin((double)(frame * M_PI / 60)); |
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258 | |
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259 | /* Go ! */ |
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260 | for(;;) |
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261 | { |
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262 | caca_event_t ev; |
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263 | if(caca_get_event(dp, CACA_EVENT_KEY_PRESS, &ev, 0)) |
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264 | { |
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265 | switch(ev.data.key.ch) |
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266 | { |
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267 | case CACA_KEY_ESCAPE: goto end; |
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268 | case ' ': pause = !pause; |
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269 | } |
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270 | } |
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271 | |
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272 | if(pause) |
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273 | goto paused; |
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274 | |
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275 | frame++; |
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276 | if(frame >= 360) |
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277 | frame = 0; |
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278 | |
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279 | /* Crop the palette */ |
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280 | for(p = CROPBALL; p < 255; p++) |
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281 | { |
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282 | int t1, t2, t3; |
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283 | double c1 = frameOffset[frame]; |
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284 | double c2 = frameOffset[frame+40]; |
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285 | double c3 = frameOffset[frame+80]; |
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286 | |
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287 | t1 = p < 0x40 ? 0 : p < 0xc0 ? (p - 0x40) * 0x20 : 0xfff; |
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288 | t2 = p < 0xe0 ? 0 : (p - 0xe0) * 0x80; |
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289 | t3 = p < 0x40 ? p * 0x40 : 0xfff; |
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290 | |
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291 | r[p] = (c1 * t1 + c2 * t2 + c3 * t3) / 4; |
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292 | g[p] = (c1 * t2 + c2 * t3 + c3 * t1) / 4; |
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293 | b[p] = (c1 * t3 + c2 * t1 + c3 * t2) / 4; |
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294 | } |
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295 | |
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296 | /* Set the palette */ |
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297 | cucul_set_dither_palette(cucul_dither, r, g, b, a); |
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298 | |
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299 | /* Silly paths for our balls */ |
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300 | for(p = 0; p < METABALLS; p++) |
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301 | { |
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302 | float u = di[p] * i + dj[p] * j + dk[p] * sin(di[p] * k); |
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303 | float v = dd[p] + di[p] * j + dj[p] * k + dk[p] * sin(dk[p] * i); |
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304 | u = sin(i + u * 2.1) * (1.0 + sin(u)); |
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305 | v = sin(j + v * 1.9) * (1.0 + sin(v)); |
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306 | x[p] = (XSIZ - METASIZE) / 2 + u * (XSIZ - METASIZE) / 4; |
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307 | y[p] = (YSIZ - METASIZE) / 2 + v * (YSIZ - METASIZE) / 4; |
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308 | } |
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309 | |
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310 | i += 0.011; |
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311 | j += 0.017; |
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312 | k += 0.019; |
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313 | |
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314 | memset(screen, 0, XSIZ * YSIZ); |
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315 | |
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316 | /* Here is all the trick. Maybe if you're that |
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317 | * clever you'll understand. */ |
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318 | for(p = 0; p < METABALLS; p++) |
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319 | draw_ball(x[p], y[p]); |
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320 | |
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321 | paused: |
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322 | /* Draw our virtual buffer to screen, letting libcucul resize it */ |
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323 | cucul_dither_bitmap(cv, 0, 0, |
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324 | cucul_get_canvas_width(cv), |
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325 | cucul_get_canvas_height(cv), |
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326 | cucul_dither, screen + (METASIZE / 2) * (1 + XSIZ)); |
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327 | cucul_set_color(cv, CUCUL_COLOR_WHITE, CUCUL_COLOR_BLUE); |
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328 | cucul_putstr(cv, cucul_get_canvas_width(cv) - 30, |
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329 | cucul_get_canvas_height(cv) - 2, |
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330 | " -=[ Powered by libcaca ]=- "); |
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331 | |
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332 | caca_refresh_display(dp); |
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333 | } |
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334 | |
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335 | /* End, bye folks */ |
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336 | end: |
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337 | cucul_free_dither(cucul_dither); |
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338 | caca_free_display(dp); |
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339 | cucul_free_canvas(cv); |
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340 | |
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341 | return 0; |
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342 | } |
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343 | |
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344 | /* Generate ball sprite |
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345 | * You should read the comments, I already wrote that before ... */ |
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346 | static void create_ball(void) |
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347 | { |
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348 | int x, y; |
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349 | float distance; |
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350 | |
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351 | for(y = 0; y < METASIZE; y++) |
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352 | for(x = 0; x < METASIZE; x++) |
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353 | { |
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354 | distance = ((METASIZE/2) - x) * ((METASIZE/2) - x) |
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355 | + ((METASIZE/2) - y) * ((METASIZE/2) - y); |
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356 | distance = sqrt(distance) * 64 / METASIZE; |
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357 | metaball[x + y * METASIZE] = distance > 15 ? 0 : (255 - distance) * 15; |
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358 | } |
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359 | } |
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360 | |
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361 | /* You missed the trick ? */ |
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362 | static void draw_ball(unsigned int bx, unsigned int by) |
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363 | { |
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364 | unsigned int color; |
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365 | unsigned int i, e = 0; |
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366 | unsigned int b = (by * XSIZ) + bx; |
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367 | |
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368 | for(i = 0; i < METASIZE * METASIZE; i++) |
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369 | { |
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370 | color = screen[b] + metaball[i]; |
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371 | |
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372 | if(color > 255) |
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373 | color = 255; |
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374 | |
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375 | screen[b] = color; |
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376 | if(e == METASIZE) |
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377 | { |
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378 | e = 0; |
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379 | b += XSIZ - METASIZE; |
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380 | } |
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381 | b++; |
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382 | e++; |
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383 | } |
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384 | } |
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385 | |
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386 | static int main_moir(int argc, char **argv) |
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387 | { |
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388 | cucul_canvas_t *cv; caca_display_t *dp; |
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389 | unsigned int red[256], green[256], blue[256], alpha[256]; |
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390 | cucul_dither_t *dither; |
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391 | int i, x, y, frame = 0, pause = 0; |
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392 | |
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393 | cv = cucul_create_canvas(0, 0); |
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394 | if(!cv) |
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395 | return 1; |
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396 | dp = caca_create_display(cv); |
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397 | if(!dp) |
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398 | return 1; |
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399 | |
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400 | caca_set_display_time(dp, 20000); |
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401 | |
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402 | /* Fill various tables */ |
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403 | for(i = 0 ; i < 256; i++) |
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404 | red[i] = green[i] = blue[i] = alpha[i] = 0; |
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405 | |
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406 | red[0] = green[0] = blue[0] = 0x777; |
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407 | red[1] = green[1] = blue[1] = 0xfff; |
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408 | |
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409 | /* Fill the circle */ |
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410 | for(i = DISCSIZ * 2; i > 0; i -= DISCTHICKNESS) |
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411 | draw_disc(i, (i / DISCTHICKNESS) % 2); |
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412 | |
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413 | /* Create a libcucul dither */ |
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414 | dither = cucul_create_dither(8, XSIZ, YSIZ, XSIZ, 0, 0, 0, 0); |
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415 | |
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416 | /* Main loop */ |
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417 | for(;;) |
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418 | { |
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419 | caca_event_t ev; |
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420 | if(caca_get_event(dp, CACA_EVENT_KEY_PRESS, &ev, 0)) |
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421 | { |
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422 | switch(ev.data.key.ch) |
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423 | { |
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424 | case CACA_KEY_ESCAPE: goto end; |
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425 | case ' ': pause = !pause; |
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426 | } |
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427 | } |
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428 | |
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429 | if(pause) |
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430 | goto paused; |
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431 | |
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432 | memset(screen, 0, XSIZ * YSIZ); |
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433 | |
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434 | /* Set the palette */ |
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435 | red[0] = 0.5 * (1 + sin(0.05 * frame)) * 0xfff; |
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436 | green[0] = 0.5 * (1 + cos(0.07 * frame)) * 0xfff; |
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437 | blue[0] = 0.5 * (1 + cos(0.06 * frame)) * 0xfff; |
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438 | |
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439 | red[1] = 0.5 * (1 + sin(0.07 * frame + 5.0)) * 0xfff; |
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440 | green[1] = 0.5 * (1 + cos(0.06 * frame + 5.0)) * 0xfff; |
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441 | blue[1] = 0.5 * (1 + cos(0.05 * frame + 5.0)) * 0xfff; |
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442 | |
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443 | cucul_set_dither_palette(dither, red, green, blue, alpha); |
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444 | |
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445 | /* Draw circles */ |
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446 | x = cos(0.07 * frame + 5.0) * 128.0 + (XSIZ / 2); |
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447 | y = sin(0.11 * frame) * 128.0 + (YSIZ / 2); |
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448 | put_disc(x, y); |
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449 | |
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450 | x = cos(0.13 * frame + 2.0) * 64.0 + (XSIZ / 2); |
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451 | y = sin(0.09 * frame + 1.0) * 64.0 + (YSIZ / 2); |
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452 | put_disc(x, y); |
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453 | |
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454 | frame++; |
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455 | |
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456 | paused: |
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457 | cucul_dither_bitmap(cv, 0, 0, |
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458 | cucul_get_canvas_width(cv), |
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459 | cucul_get_canvas_height(cv), |
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460 | dither, screen); |
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461 | cucul_set_color(cv, CUCUL_COLOR_WHITE, CUCUL_COLOR_BLUE); |
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462 | cucul_putstr(cv, cucul_get_canvas_width(cv) - 30, |
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463 | cucul_get_canvas_height(cv) - 2, |
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464 | " -=[ Powered by libcaca ]=- "); |
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465 | caca_refresh_display(dp); |
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466 | } |
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467 | |
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468 | end: |
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469 | cucul_free_dither(dither); |
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470 | caca_free_display(dp); |
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471 | cucul_free_canvas(cv); |
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472 | |
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473 | return 0; |
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474 | } |
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475 | |
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476 | static void put_disc(int x, int y) |
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477 | { |
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478 | char *src = ((char*)disc) + (DISCSIZ / 2 - x) + (DISCSIZ / 2 - y) * DISCSIZ; |
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479 | int i, j; |
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480 | |
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481 | for(j = 0; j < YSIZ; j++) |
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482 | for(i = 0; i < XSIZ; i++) |
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483 | { |
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484 | screen[i + XSIZ * j] ^= src[i + DISCSIZ * j]; |
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485 | } |
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486 | } |
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487 | |
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488 | static void draw_disc(int r, char color) |
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489 | { |
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490 | int t, dx, dy; |
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491 | |
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492 | for(t = 0, dx = 0, dy = r; dx <= dy; dx++) |
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493 | { |
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494 | draw_line(dx / 3, dy / 3, color); |
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495 | draw_line(dy / 3, dx / 3, color); |
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496 | |
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497 | t += t > 0 ? dx - dy-- : dx; |
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498 | } |
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499 | } |
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500 | |
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501 | static void draw_line(int x, int y, char color) |
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502 | { |
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503 | if(x == 0 || y == 0 || y > DISCSIZ / 2) |
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504 | return; |
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505 | |
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506 | if(x > DISCSIZ / 2) |
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507 | x = DISCSIZ / 2; |
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508 | |
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509 | memset(disc + (DISCSIZ / 2) - x + DISCSIZ * ((DISCSIZ / 2) - y), |
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510 | color, 2 * x - 1); |
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511 | memset(disc + (DISCSIZ / 2) - x + DISCSIZ * ((DISCSIZ / 2) + y - 1), |
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512 | color, 2 * x - 1); |
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513 | } |
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514 | |
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