cacalabs
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libcaca
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libcaca/test/demo.c

601 satır
17 KiB
Ham Suçlama Geçmiş 

  1. /*

  2.  *  demo          demo for libcaca

  3.  *  Copyright (c) 2003 Sam Hocevar <sam@zoy.org>

  4.  *                All Rights Reserved

  5.  *

  6.  *  $Id$

  7.  *

  8.  *  This program is free software; you can redistribute it and/or

  9.  *  modify it under the terms of the Do What The Fuck You Want To

  10.  *  Public License, Version 2, as published by Sam Hocevar. See

  11.  *  http://sam.zoy.org/wtfpl/COPYING for more details.

  12.  */

  13. 

  14. #include "config.h"

  15. #include "common.h"

  16. 

  17. #include <math.h>

  18. #include <string.h>

  19. #include <stdio.h>

  20. 

  21. #include "caca.h"

  22. 

  23. static void display_menu(void);

  24. 

  25. static void demo_all(void);

  26. 

  27. static void demo_color(void);

  28. static void demo_dots(void);

  29. static void demo_lines(void);

  30. static void demo_boxes(void);

  31. static void demo_ellipses(void);

  32. static void demo_triangles(void);

  33. /*static void demo_sprites(void);*/

  34. static void demo_render(void);

  35. 

  36. int bounds = 0;

  37. int outline = 0;

  38. int dithering = 0;

  39. #if 0

  40. cucul_sprite_t *sprite = NULL;

  41. #endif

  42. 

  43. cucul_canvas_t *cv;

  44. caca_display_t *dp;

  45. 

  46. int main(int argc, char **argv)

  47. {

  48.     void (*demo)(void) = NULL;

  49.     int quit = 0;

  50. 

  51.     cv = cucul_create_canvas(0, 0);

  52.     if(!cv)

  53.         return 1;

  54.     dp = caca_create_display(cv);

  55.     if(!dp)

  56.         return 1;

  57. 

  58.     caca_set_display_time(dp, 40000);

  59. 

  60.     /* Initialize data */

  61. #if 0

  62.     sprite = cucul_load_sprite(DATADIR "/caca.txt");

  63.     if(!sprite)

  64.         sprite = cucul_load_sprite("caca.txt");

  65.     if(!sprite)

  66.         sprite = cucul_load_sprite("examples/caca.txt");

  67. #endif

  68. 

  69.     /* Disable cursor */

  70.     caca_set_mouse(dp, 0);

  71. 

  72.     /* Main menu */

  73.     display_menu();

  74.     caca_refresh_display(dp);

  75. 

  76.     /* Go ! */

  77.     while(!quit)

  78.     {

  79.         caca_event_t ev;

  80.         int menu = 0, mouse = 0, xmouse = 0, ymouse = 0;

  81. 

  82.         while(caca_get_event(dp, CACA_EVENT_ANY, &ev, 0))

  83.         {

  84.             if(demo && (ev.type & CACA_EVENT_KEY_PRESS))

  85.             {

  86.                 menu = 1;

  87.                 demo = NULL;

  88.             }

  89.             else if(ev.type & CACA_EVENT_KEY_PRESS)

  90.             {

  91.                 switch(ev.data.key.ch)

  92.                 {

  93.                 case 'q':

  94.                 case 'Q':

  95.                     demo = NULL;

  96.                     quit = 1;

  97.                     break;

  98.                 case 'o':

  99.                 case 'O':

  100.                     outline = (outline + 1) % 3;

  101.                     display_menu();

  102.                     break;

  103.                 case 'b':

  104.                 case 'B':

  105.                     bounds = (bounds + 1) % 2;

  106.                     display_menu();

  107.                     break;

  108. #if 0

  109.                 case 'd':

  110.                 case 'D':

  111.                     dithering = (dithering + 1) % 5;

  112.                     cucul_set_feature(cv, dithering);

  113.                     display_menu();

  114.                     break;

  115. #endif

  116.                 case 'c':

  117.                     demo = demo_color;

  118.                     break;

  119.                 case 'f':

  120.                 case 'F':

  121.                     demo = demo_all;

  122.                     break;

  123.                 case '1':

  124.                     demo = demo_dots;

  125.                     break;

  126.                 case '2':

  127.                     demo = demo_lines;

  128.                     break;

  129.                 case '3':

  130.                     demo = demo_boxes;

  131.                     break;

  132.                 case '4':

  133.                     demo = demo_triangles;

  134.                     break;

  135.                 case '5':

  136.                     demo = demo_ellipses;

  137.                     break;

  138. #if 0

  139.                 case 's':

  140.                 case 'S':

  141.                     if(sprite)

  142.                         demo = demo_sprites;

  143.                     break;

  144. #endif

  145.                 case 'r':

  146.                 case 'R':

  147.                     demo = demo_render;

  148.                     break;

  149.                 }

  150. 

  151.                 if(demo)

  152.                 {

  153.                     cucul_set_color(cv, CUCUL_COLOR_LIGHTGRAY, CUCUL_COLOR_BLACK);

  154.                     cucul_clear_canvas(cv);

  155.                 }

  156.             }

  157.             else if(ev.type & CACA_EVENT_MOUSE_MOTION)

  158.             {

  159.                 mouse = 1;

  160.                 xmouse = ev.data.mouse.x;

  161.                 ymouse = ev.data.mouse.y;

  162.             }

  163.             else if(ev.type & CACA_EVENT_RESIZE)

  164.             {

  165.                 mouse = 1; /* old hack */

  166.             }

  167.         }

  168. 

  169.         if(menu || (mouse && !demo))

  170.         {

  171.             display_menu();

  172.             if(mouse && !demo)

  173.             {

  174.                 cucul_set_color(cv, CUCUL_COLOR_RED, CUCUL_COLOR_BLACK);

  175.                 cucul_putstr(cv, xmouse, ymouse,     ".");

  176.                 cucul_putstr(cv, xmouse, ymouse + 1, "|\\");

  177.             }

  178.             caca_refresh_display(dp);

  179.             mouse = menu = 0;

  180.         }

  181. 

  182.         if(demo)

  183.         {

  184.             demo();

  185. 

  186.             cucul_set_color(cv, CUCUL_COLOR_LIGHTGRAY, CUCUL_COLOR_BLACK);

  187.             cucul_draw_thin_box(cv, 1, 1, cucul_get_canvas_width(cv) - 2,

  188.                                           cucul_get_canvas_height(cv) - 2);

  189.             cucul_printf(cv, 4, 1, "[%i.%i fps]----",

  190.                          1000000 / caca_get_display_time(dp),

  191.                          (10000000 / caca_get_display_time(dp)) % 10);

  192.             caca_refresh_display(dp);

  193.         }

  194.     }

  195. 

  196.     /* Clean up */

  197. #if 0

  198.     cucul_free_sprite(sprite);

  199. #endif

  200.     caca_free_display(dp);

  201.     cucul_free_canvas(cv);

  202. 

  203.     return 0;

  204. }

  205. 

  206. static void display_menu(void)

  207. {

  208.     int xo = cucul_get_canvas_width(cv) - 2;

  209.     int yo = cucul_get_canvas_height(cv) - 2;

  210. 

  211.     cucul_set_color(cv, CUCUL_COLOR_LIGHTGRAY, CUCUL_COLOR_BLACK);

  212.     cucul_clear_canvas(cv);

  213.     cucul_draw_thin_box(cv, 1, 1, xo, yo);

  214. 

  215.     cucul_putstr(cv, (xo - strlen("libcaca demo")) / 2, 3, "libcaca demo");

  216.     cucul_putstr(cv, (xo - strlen("==============")) / 2, 4, "==============");

  217. 

  218.     cucul_putstr(cv, 4, 6, "demos:");

  219.     cucul_putstr(cv, 4, 7, "'f': full");

  220.     cucul_putstr(cv, 4, 8, "'1': dots");

  221.     cucul_putstr(cv, 4, 9, "'2': lines");

  222.     cucul_putstr(cv, 4, 10, "'3': boxes");

  223.     cucul_putstr(cv, 4, 11, "'4': triangles");

  224.     cucul_putstr(cv, 4, 12, "'5': ellipses");

  225.     cucul_putstr(cv, 4, 13, "'c': colour");

  226.     cucul_putstr(cv, 4, 14, "'r': render");

  227. #if 0

  228.     if(sprite)

  229.         cucul_putstr(cv, 4, 15, "'s': sprites");

  230. #endif

  231. 

  232.     cucul_putstr(cv, 4, 16, "settings:");

  233.     cucul_printf(cv, 4, 17, "'o': outline: %s",

  234.                  outline == 0 ? "none" : outline == 1 ? "solid" : "thin");

  235.     cucul_printf(cv, 4, 18, "'b': drawing boundaries: %s",

  236.                  bounds == 0 ? "screen" : "infinite");

  237.     //cucul_printf(cv, 4, 19, "'d': dithering (%s)",

  238.     //             cucul_get_feature_name(dithering));

  239. 

  240.     cucul_putstr(cv, 4, yo - 2, "'q': quit");

  241. 

  242.     caca_refresh_display(dp);

  243. }

  244. 

  245. static void demo_all(void)

  246. {

  247.     static int i = 0;

  248. 

  249.     int j, xo, yo, xa, ya, xb, yb, xc, yc;

  250. 

  251.     i++;

  252. 

  253.     cucul_set_color(cv, CUCUL_COLOR_LIGHTGRAY, CUCUL_COLOR_BLACK);

  254.     cucul_clear_canvas(cv);

  255. 

  256.     /* Draw the sun */

  257.     cucul_set_color(cv, CUCUL_COLOR_YELLOW, CUCUL_COLOR_BLACK);

  258.     xo = cucul_get_canvas_width(cv) / 4;

  259.     yo = cucul_get_canvas_height(cv) / 4 + 5 * sin(0.03*i);

  260. 

  261.     for(j = 0; j < 16; j++)

  262.     {

  263.         xa = xo - (30 + sin(0.03*i) * 8) * sin(0.03*i + M_PI*j/8);

  264.         ya = yo + (15 + sin(0.03*i) * 4) * cos(0.03*i + M_PI*j/8);

  265.         cucul_draw_thin_line(cv, xo, yo, xa, ya);

  266.     }

  267. 

  268.     j = 15 + sin(0.03*i) * 8;

  269.     cucul_set_color(cv, CUCUL_COLOR_WHITE, CUCUL_COLOR_BLACK);

  270.     cucul_fill_ellipse(cv, xo, yo, j, j / 2, "#");

  271.     cucul_set_color(cv, CUCUL_COLOR_YELLOW, CUCUL_COLOR_BLACK);

  272.     cucul_draw_ellipse(cv, xo, yo, j, j / 2, "#");

  273. 

  274.     /* Draw the pyramid */

  275.     xo = cucul_get_canvas_width(cv) * 5 / 8;

  276.     yo = 2;

  277. 

  278.     xa = cucul_get_canvas_width(cv) / 8 + sin(0.03*i) * 5;

  279.     ya = cucul_get_canvas_height(cv) / 2 + cos(0.03*i) * 5;

  280. 

  281.     xb = cucul_get_canvas_width(cv) - 10 - cos(0.02*i) * 10;

  282.     yb = cucul_get_canvas_height(cv) * 3 / 4 - 5 + sin(0.02*i) * 5;

  283. 

  284.     xc = cucul_get_canvas_width(cv) / 4 - sin(0.02*i) * 5;

  285.     yc = cucul_get_canvas_height(cv) * 3 / 4 + cos(0.02*i) * 5;

  286. 

  287.     cucul_set_color(cv, CUCUL_COLOR_GREEN, CUCUL_COLOR_BLACK);

  288.     cucul_fill_triangle(cv, xo, yo, xb, yb, xa, ya, "%");

  289.     cucul_set_color(cv, CUCUL_COLOR_YELLOW, CUCUL_COLOR_BLACK);

  290.     cucul_draw_thin_triangle(cv, xo, yo, xb, yb, xa, ya);

  291. 

  292.     cucul_set_color(cv, CUCUL_COLOR_RED, CUCUL_COLOR_BLACK);

  293.     cucul_fill_triangle(cv, xa, ya, xb, yb, xc, yc, "#");

  294.     cucul_set_color(cv, CUCUL_COLOR_YELLOW, CUCUL_COLOR_BLACK);

  295.     cucul_draw_thin_triangle(cv, xa, ya, xb, yb, xc, yc);

  296. 

  297.     cucul_set_color(cv, CUCUL_COLOR_BLUE, CUCUL_COLOR_BLACK);

  298.     cucul_fill_triangle(cv, xo, yo, xb, yb, xc, yc, "%");

  299.     cucul_set_color(cv, CUCUL_COLOR_YELLOW, CUCUL_COLOR_BLACK);

  300.     cucul_draw_thin_triangle(cv, xo, yo, xb, yb, xc, yc);

  301. 

  302.     /* Draw a background triangle */

  303.     xa = 2;

  304.     ya = 2;

  305. 

  306.     xb = cucul_get_canvas_width(cv) - 3;

  307.     yb = cucul_get_canvas_height(cv) / 2;

  308. 

  309.     xc = cucul_get_canvas_width(cv) / 3;

  310.     yc = cucul_get_canvas_height(cv) - 3;

  311. 

  312.     cucul_set_color(cv, CUCUL_COLOR_CYAN, CUCUL_COLOR_BLACK);

  313.     cucul_draw_thin_triangle(cv, xa, ya, xb, yb, xc, yc);

  314. 

  315.     xo = cucul_get_canvas_width(cv) / 2 + cos(0.027*i) * cucul_get_canvas_width(cv) / 3;

  316.     yo = cucul_get_canvas_height(cv) / 2 - sin(0.027*i) * cucul_get_canvas_height(cv) / 2;

  317. 

  318.     cucul_draw_thin_line(cv, xa, ya, xo, yo);

  319.     cucul_draw_thin_line(cv, xb, yb, xo, yo);

  320.     cucul_draw_thin_line(cv, xc, yc, xo, yo);

  321. 

  322.     /* Draw a sprite on the pyramid */

  323. #if 0

  324.     cucul_draw_sprite(cv, xo, yo, sprite, 0);

  325. #endif

  326. 

  327.     /* Draw a trail behind the foreground sprite */

  328.     for(j = i - 60; j < i; j++)

  329.     {

  330.         int delta = cucul_rand(-5, 6);

  331.         cucul_set_color(cv, cucul_rand(0, 16), cucul_rand(0, 16));

  332.         cucul_putchar(cv, cucul_get_canvas_width(cv) / 2

  333.                     + cos(0.02*j) * (delta + cucul_get_canvas_width(cv) / 4),

  334.                    cucul_get_canvas_height(cv) / 2

  335.                     + sin(0.02*j) * (delta + cucul_get_canvas_height(cv) / 3),

  336.                    '#');

  337.     }

  338. 

  339.     /* Draw foreground sprite */

  340. #if 0

  341.     cucul_draw_sprite(cv, cucul_get_canvas_width(cv) / 2 + cos(0.02*i) * cucul_get_canvas_width(cv) / 4,

  342.                    cucul_get_canvas_height(cv) / 2 + sin(0.02*i) * cucul_get_canvas_height(cv) / 3,

  343.                    sprite, 0);

  344. #endif

  345. }

  346. 

  347. static void demo_dots(void)

  348. {

  349.     int xmax = cucul_get_canvas_width(cv);

  350.     int ymax = cucul_get_canvas_height(cv);

  351.     int i;

  352.     static char chars[10] =

  353.     {

  354.         '+', '-', '*', '#', 'X', '@', '%', '$', 'M', 'W'

  355.     };

  356. 

  357.     for(i = 1000; i--;)

  358.     {

  359.         /* Putpixel */

  360.         cucul_set_color(cv, cucul_rand(0, 16), cucul_rand(0, 16));

  361.         cucul_putchar(cv, cucul_rand(0, xmax), cucul_rand(0, ymax),

  362.                       chars[cucul_rand(0, 9)]);

  363.     }

  364. }

  365. 

  366. static void demo_color(void)

  367. {

  368.     int i, j;

  369.     char buf[BUFSIZ];

  370. 

  371.     cucul_set_color(cv, CUCUL_COLOR_LIGHTGRAY, CUCUL_COLOR_BLACK);

  372.     cucul_clear_canvas(cv);

  373.     for(i = 0; i < 16; i++)

  374.     {

  375.         sprintf(buf, "'%c': %i (%s)", 'a' + i, i, cucul_get_color_name(i));

  376.         cucul_set_color(cv, CUCUL_COLOR_LIGHTGRAY, CUCUL_COLOR_BLACK);

  377.         cucul_putstr(cv, 4, i + (i >= 8 ? 4 : 3), buf);

  378.         for(j = 0; j < 16; j++)

  379.         {

  380.             cucul_set_color(cv, i, j);

  381.             cucul_putstr(cv, (j >= 8 ? 41 : 40) + j * 2, i + (i >= 8 ? 4 : 3), "# ");

  382.         }

  383.     }

  384. }

  385. 

  386. static void demo_lines(void)

  387. {

  388.     int w = cucul_get_canvas_width(cv);

  389.     int h = cucul_get_canvas_height(cv);

  390.     int xa, ya, xb, yb;

  391. 

  392.     if(bounds)

  393.     {

  394.         xa = cucul_rand(- w, 2 * w); ya = cucul_rand(- h, 2 * h);

  395.         xb = cucul_rand(- w, 2 * w); yb = cucul_rand(- h, 2 * h);

  396.     }

  397.     else

  398.     {

  399.         xa = cucul_rand(0, w); ya = cucul_rand(0, h);

  400.         xb = cucul_rand(0, w); yb = cucul_rand(0, h);

  401.     }

  402. 

  403.     cucul_set_color(cv, cucul_rand(0, 16), CUCUL_COLOR_BLACK);

  404.     if(outline > 1)

  405.         cucul_draw_thin_line(cv, xa, ya, xb, yb);

  406.     else

  407.         cucul_draw_line(cv, xa, ya, xb, yb, "#");

  408. }

  409. 

  410. static void demo_boxes(void)

  411. {

  412.     int w = cucul_get_canvas_width(cv);

  413.     int h = cucul_get_canvas_height(cv);

  414.     int xa, ya, xb, yb;

  415. 

  416.     if(bounds)

  417.     {

  418.         xa = cucul_rand(- w, 2 * w); ya = cucul_rand(- h, 2 * h);

  419.         xb = cucul_rand(- w, 2 * w); yb = cucul_rand(- h, 2 * h);

  420.     }

  421.     else

  422.     {

  423.         xa = cucul_rand(0, w); ya = cucul_rand(0, h);

  424.         xb = cucul_rand(0, w); yb = cucul_rand(0, h);

  425.     }

  426. 

  427.     cucul_set_color(cv, cucul_rand(0, 16), cucul_rand(0, 16));

  428.     cucul_fill_box(cv, xa, ya, xb, yb, "#");

  429. 

  430.     cucul_set_color(cv, cucul_rand(0, 16), CUCUL_COLOR_BLACK);

  431.     if(outline == 2)

  432.         cucul_draw_thin_box(cv, xa, ya, xb, yb);

  433.     else if(outline == 1)

  434.         cucul_draw_box(cv, xa, ya, xb, yb, "#");

  435. }

  436. 

  437. static void demo_ellipses(void)

  438. {

  439.     int w = cucul_get_canvas_width(cv);

  440.     int h = cucul_get_canvas_height(cv);

  441.     int x, y, a, b;

  442. 

  443.     if(bounds)

  444.     {

  445.         x = cucul_rand(- w, 2 * w); y = cucul_rand(- h, 2 * h);

  446.         a = cucul_rand(0, w); b = cucul_rand(0, h);

  447.     }

  448.     else

  449.     {

  450.         do

  451.         {

  452.             x = cucul_rand(0, w); y = cucul_rand(0, h);

  453.             a = cucul_rand(0, w); b = cucul_rand(0, h);

  454. 

  455.         } while(x - a < 0 || x + a >= w || y - b < 0 || y + b >= h);

  456.     }

  457. 

  458.     cucul_set_color(cv, cucul_rand(0, 16), cucul_rand(0, 16));

  459.     cucul_fill_ellipse(cv, x, y, a, b, "#");

  460. 

  461.     cucul_set_color(cv, cucul_rand(0, 16), CUCUL_COLOR_BLACK);

  462.     if(outline == 2)

  463.         cucul_draw_thin_ellipse(cv, x, y, a, b);

  464.     else if(outline == 1)

  465.         cucul_draw_ellipse(cv, x, y, a, b, "#");

  466. }

  467. 

  468. static void demo_triangles(void)

  469. {

  470.     int w = cucul_get_canvas_width(cv);

  471.     int h = cucul_get_canvas_height(cv);

  472.     int xa, ya, xb, yb, xc, yc;

  473. 

  474.     if(bounds)

  475.     {

  476.         xa = cucul_rand(- w, 2 * w); ya = cucul_rand(- h, 2 * h);

  477.         xb = cucul_rand(- w, 2 * w); yb = cucul_rand(- h, 2 * h);

  478.         xc = cucul_rand(- w, 2 * w); yc = cucul_rand(- h, 2 * h);

  479.     }

  480.     else

  481.     {

  482. 

  483.         xa = cucul_rand(0, w); ya = cucul_rand(0, h);

  484.         xb = cucul_rand(0, w); yb = cucul_rand(0, h);

  485.         xc = cucul_rand(0, w); yc = cucul_rand(0, h);

  486.     }

  487. 

  488.     cucul_set_color(cv, cucul_rand(0, 16), cucul_rand(0, 16));

  489.     cucul_fill_triangle(cv, xa, ya, xb, yb, xc, yc, "#");

  490. 

  491.     cucul_set_color(cv, cucul_rand(0, 16), CUCUL_COLOR_BLACK);

  492.     if(outline == 2)

  493.         cucul_draw_thin_triangle(cv, xa, ya, xb, yb, xc, yc);

  494.     else if(outline == 1)

  495.         cucul_draw_triangle(cv, xa, ya, xb, yb, xc, yc, "#");

  496. }

  497. #if 0

  498. static void demo_sprites(void)

  499. {

  500. 

  501.     cucul_draw_sprite(cv, cucul_rand(0, cucul_get_canvas_width(cv)),

  502.                       cucul_rand(0, cucul_get_canvas_height(cv)), sprite, 0);

  503. 

  504. }

  505. #endif

  506. #if 0

  507. static void demo_render(void)

  508. {

  509.     cucul_dither_t *dither;

  510.     //short buffer[256*256];

  511.     //short *dest = buffer;

  512.     int buffer[256*256];

  513.     int *dest = buffer;

  514.     int x, y, z;

  515.     static int i = 0;

  516. 

  517.     i = (i + 1) % 512;

  518.     z = i < 256 ? i : 511 - i;

  519. 

  520.     for(x = 0; x < 256; x++)

  521.         for(y = 0; y < 256; y++)

  522.     {

  523.         //*dest++ = ((x >> 3) << 11) | ((y >> 2) << 5) | ((z >> 3));

  524.         *dest++ = (x << 16) | (y << 8) | (z);

  525.     }

  526.     cucul_set_dither_invert(dither, 1);

  527.     //dither = cucul_create_dither(16, 256, 256, 2 * 256, 0xf800, 0x07e0, 0x001f, 0x0000);

  528.     dither = cucul_create_dither(32, 256, 256, 4 * 256, 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000);

  529.     cucul_dither_bitmap(cv, 0, 0, cucul_get_canvas_width(cv), cucul_get_canvas_height(cv),

  530.                      dither, buffer);

  531.     cucul_free_dither(dither);

  532. }

  533. #endif

  534. 

  535. static void draw_circle(int *buffer, int xo, int yo, int r, int mask, int val);

  536. 

  537. static void demo_render(void)

  538. {

  539.     cucul_dither_t *dither;

  540.     int buffer[256*256];

  541.     int *dest;

  542.     int x, y, z, xo, yo;

  543.     static int i = 0;

  544. 

  545.     i++;

  546. 

  547.     dest = buffer;

  548.     for(x = 0; x < 256; x++)

  549.         for(y = 0; y < 256; y++)

  550.     {

  551.         *dest++ = 0xff000000;

  552.     }

  553. 

  554.     /* red */

  555.     xo = 128 + 48 * sin(0.02 * i);

  556.     yo = 128 + 48 * cos(0.03 * i);

  557.     for(z = 0; z < 240; z++)

  558.         draw_circle(buffer, xo, yo, z, 0x00ff0000, 200 << 16);

  559. 

  560.     /* green */

  561.     xo = 128 + 48 * sin(2 + 0.06 * i);

  562.     yo = 128 + 48 * cos(2 + 0.05 * i);

  563.     for(z = 0; z < 240; z++)

  564.         draw_circle(buffer, xo, yo, z, 0x0000ff00, 200 << 8);

  565. 

  566.     /* blue */

  567.     xo = 128 + 48 * sin(1 + 0.04 * i);

  568.     yo = 128 + 48 * cos(1 + 0.03 * i);

  569.     for(z = 0; z < 240; z++)

  570.         draw_circle(buffer, xo, yo, z, 0x000000ff, 200);

  571. 

  572.     dither = cucul_create_dither(32, 256, 256, 4 * 256, 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000);

  573.  cucul_set_dither_invert(dither, 1);

  574.     cucul_dither_bitmap(cv, 0, 0, cucul_get_canvas_width(cv), cucul_get_canvas_height(cv), dither, (char *)buffer);

  575.     cucul_free_dither(dither);

  576. }

  577. 

  578. static void draw_circle(int *buffer, int x, int y, int r, int mask, int val)

  579. {

  580.     int t, dx, dy;

  581. 

  582. #define POINT(X,Y) \

  583.     buffer[(X) + 256 * (Y)] = 0xff000000 | (buffer[(X) + 256 * (Y)] & ~mask) | val;

  584. 

  585.     for(t = 0, dx = 0, dy = r; dx <= dy; dx++)

  586.     {

  587.         POINT(x - dx / 3, y - dy / 3);

  588.         POINT(x + dx / 3, y - dy / 3);

  589.         POINT(x - dx / 3, y + dy / 3);

  590.         POINT(x + dx / 3, y + dy / 3);

  591. 

  592.         POINT(x - dy / 3, y - dx / 3);

  593.         POINT(x + dy / 3, y - dx / 3);

  594.         POINT(x - dy / 3, y + dx / 3);

  595.         POINT(x + dy / 3, y + dx / 3);

  596. 

  597.         t += t > 0 ? dx - dy-- : dx;

  598.     }

  599. }