1 | /* |
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2 | * cacaball metaballs effect for libcaca |
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3 | * Copyright (c) 2003-2004 Jean-Yves Lamoureux <jylam@lnxscene.org> |
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4 | * All Rights Reserved |
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5 | * |
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6 | * $Id: cacaball.c 527 2006-03-06 08:32:40Z 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 <stdio.h> |
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17 | #include <stdlib.h> |
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18 | #include <string.h> |
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19 | #include <math.h> |
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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 "cucul.h" |
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26 | #include "caca.h" |
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27 | |
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28 | /* Virtual buffer size */ |
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29 | #define XSIZ 256 |
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30 | #define YSIZ 256 |
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31 | |
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32 | #define METASIZE 100 |
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33 | #define METABALLS 16 |
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34 | |
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35 | /* Colour index where to crop balls */ |
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36 | #define CROPBALL 160 |
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37 | |
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38 | static void create_ball(void); |
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39 | static void draw_ball(unsigned int, unsigned int); |
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40 | |
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41 | static unsigned char pixels[XSIZ * YSIZ]; |
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42 | static unsigned char metaball[METASIZE * METASIZE]; |
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43 | |
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44 | int main(int argc, char **argv) |
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45 | { |
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46 | cucul_t *qq; caca_t *kk; |
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47 | unsigned int r[256], g[256], b[256], a[256]; |
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48 | float d[METABALLS], di[METABALLS], dj[METABALLS], dk[METABALLS]; |
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49 | unsigned int x[METABALLS], y[METABALLS]; |
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50 | struct cucul_bitmap *cucul_bitmap; |
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51 | float i = 10.0, j = 17.0, k = 11.0; |
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52 | int p, frame = 0, pause = 0; |
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53 | |
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54 | qq = cucul_init(); |
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55 | if(!qq) |
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56 | return 1; |
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57 | kk = caca_attach(qq); |
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58 | if(!kk) |
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59 | return 1; |
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60 | |
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61 | caca_set_delay(kk, 20000); |
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62 | |
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63 | /* Make the palette eatable by libcaca */ |
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64 | for(p = 0; p < 256; p++) |
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65 | r[p] = g[p] = b[p] = a[p] = 0x0; |
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66 | r[255] = g[255] = b[255] = 0xfff; |
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67 | |
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68 | /* Create a libcucul bitmap smaller than our pixel buffer, so that we |
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69 | * display only the interesting part of it */ |
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70 | cucul_bitmap = cucul_create_bitmap(qq, 8, XSIZ - METASIZE, YSIZ - METASIZE, |
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71 | XSIZ, 0, 0, 0, 0); |
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72 | |
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73 | /* Generate ball sprite */ |
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74 | create_ball(); |
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75 | |
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76 | for(p = 0; p < METABALLS; p++) |
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77 | { |
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78 | d[p] = cucul_rand(0, 100); |
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79 | di[p] = (float)cucul_rand(500, 4000) / 6000.0; |
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80 | dj[p] = (float)cucul_rand(500, 4000) / 6000.0; |
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81 | dk[p] = (float)cucul_rand(500, 4000) / 6000.0; |
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82 | } |
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83 | |
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84 | /* Go ! */ |
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85 | for(;;) |
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86 | { |
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87 | switch(caca_get_event(kk, CACA_EVENT_KEY_PRESS)) |
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88 | { |
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89 | case CACA_EVENT_KEY_PRESS | CACA_KEY_ESCAPE: goto end; |
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90 | case CACA_EVENT_KEY_PRESS | ' ': pause = !pause; |
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91 | } |
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92 | |
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93 | if(pause) |
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94 | goto paused; |
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95 | |
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96 | frame++; |
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97 | |
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98 | /* Crop the palette */ |
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99 | for(p = CROPBALL; p < 255; p++) |
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100 | { |
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101 | int t1, t2, t3; |
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102 | t1 = p < 0x40 ? 0 : p < 0xc0 ? (p - 0x40) * 0x20 : 0xfff; |
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103 | t2 = p < 0xe0 ? 0 : (p - 0xe0) * 0x80; |
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104 | t3 = p < 0x40 ? p * 0x40 : 0xfff; |
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105 | |
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106 | r[p] = (1.0 + sin((double)frame * M_PI / 60)) * t1 / 4 |
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107 | + (1.0 + sin((double)(frame + 40) * M_PI / 60)) * t2 / 4 |
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108 | + (1.0 + sin((double)(frame + 80) * M_PI / 60)) * t3 / 4; |
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109 | g[p] = (1.0 + sin((double)frame * M_PI / 60)) * t2 / 4 |
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110 | + (1.0 + sin((double)(frame + 40) * M_PI / 60)) * t3 / 4 |
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111 | + (1.0 + sin((double)(frame + 80) * M_PI / 60)) * t1 / 4; |
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112 | b[p] = (1.0 + sin((double)frame * M_PI / 60)) * t3 / 4 |
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113 | + (1.0 + sin((double)(frame + 40) * M_PI / 60)) * t1 / 4 |
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114 | + (1.0 + sin((double)(frame + 80) * M_PI / 60)) * t2 / 4; |
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115 | } |
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116 | |
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117 | /* Set the palette */ |
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118 | cucul_set_bitmap_palette(qq, cucul_bitmap, r, g, b, a); |
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119 | |
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120 | /* Silly paths for our balls */ |
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121 | for(p = 0; p < METABALLS; p++) |
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122 | { |
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123 | float u = di[p] * i + dj[p] * j + dk[p] * sin(di[p] * k); |
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124 | float v = d[p] + di[p] * j + dj[p] * k + dk[p] * sin(dk[p] * i); |
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125 | u = sin(i + u * 2.1) * (1.0 + sin(u)); |
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126 | v = sin(j + v * 1.9) * (1.0 + sin(v)); |
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127 | x[p] = (XSIZ - METASIZE) / 2 + u * (XSIZ - METASIZE) / 4; |
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128 | y[p] = (YSIZ - METASIZE) / 2 + v * (YSIZ - METASIZE) / 4; |
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129 | } |
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130 | |
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131 | i += 0.011; |
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132 | j += 0.017; |
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133 | k += 0.019; |
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134 | |
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135 | memset(pixels, 0, XSIZ * YSIZ); |
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136 | |
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137 | /* Here is all the trick. Maybe if you're that |
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138 | * clever you'll understand. */ |
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139 | for(p = 0; p < METABALLS; p++) |
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140 | draw_ball(x[p], y[p]); |
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141 | |
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142 | paused: |
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143 | /* Draw our virtual buffer to screen, letting libcucul resize it */ |
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144 | cucul_draw_bitmap(qq, 0, 0, |
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145 | cucul_get_width(qq) - 1, cucul_get_height(qq) - 1, |
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146 | cucul_bitmap, pixels + (METASIZE / 2) * (1 + XSIZ)); |
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147 | caca_display(kk); |
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148 | } |
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149 | |
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150 | /* End, bye folks */ |
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151 | end: |
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152 | cucul_free_bitmap(qq, cucul_bitmap); |
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153 | caca_detach(kk); |
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154 | cucul_end(qq); |
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155 | |
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156 | return 0; |
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157 | } |
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158 | |
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159 | /* Generate ball sprite |
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160 | * You should read the comments, I already wrote that before ... */ |
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161 | static void create_ball(void) |
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162 | { |
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163 | int x, y; |
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164 | float distance; |
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165 | |
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166 | for(y = 0; y < METASIZE; y++) |
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167 | for(x = 0; x < METASIZE; x++) |
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168 | { |
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169 | distance = ((METASIZE/2) - x) * ((METASIZE/2) - x) |
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170 | + ((METASIZE/2) - y) * ((METASIZE/2) - y); |
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171 | distance = sqrt(distance) * 64 / METASIZE; |
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172 | metaball[x + y * METASIZE] = distance > 15 ? 0 : (255 - distance) * 15; |
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173 | } |
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174 | } |
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175 | |
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176 | /* You missed the trick ? */ |
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177 | static void draw_ball(unsigned int bx, unsigned int by) |
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178 | { |
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179 | unsigned int color; |
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180 | unsigned int i, e = 0; |
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181 | unsigned int b = (by * XSIZ) + bx; |
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182 | |
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183 | for(i = 0; i < METASIZE * METASIZE; i++) |
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184 | { |
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185 | color = pixels[b] + metaball[i]; |
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186 | |
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187 | if(color > 255) |
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188 | color = 255; |
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189 | |
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190 | pixels[b] = color; |
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191 | if(e == METASIZE) |
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192 | { |
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193 | e = 0; |
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194 | b += XSIZ - METASIZE; |
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195 | } |
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196 | b++; |
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197 | e++; |
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198 | } |
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199 | } |
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200 | |
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