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libcaca
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libcaca/test/demo.c

600 line
17 KiB
原始文件 Blame 歷史記錄 

  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. 

  16. #include <math.h>

  17. #include <string.h>

  18. #include <stdio.h>

  19. 

  20. #include "caca.h"

  21. 

  22. static void display_menu(void);

  23. 

  24. static void demo_all(void);

  25. 

  26. static void demo_color(void);

  27. static void demo_dots(void);

  28. static void demo_lines(void);

  29. static void demo_boxes(void);

  30. static void demo_ellipses(void);

  31. static void demo_triangles(void);

  32. static void demo_sprites(void);

  33. static void demo_render(void);

  34. 

  35. int bounds = 0;

  36. int outline = 0;

  37. int dithering = 0;

  38. #if 0

  39. cucul_sprite_t *sprite = NULL;

  40. #endif

  41. 

  42. cucul_canvas_t *cv;

  43. caca_display_t *dp;

  44. 

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

  46. {

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

  48.     int quit = 0;

  49. 

  50.     cv = cucul_create_canvas(0, 0);

  51.     if(!cv)

  52.         return 1;

  53.     dp = caca_create_display(cv);

  54.     if(!dp)

  55.         return 1;

  56. 

  57.     caca_set_delay(dp, 40000);

  58. 

  59.     /* Initialize data */

  60. #if 0

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

  62.     if(!sprite)

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

  64.     if(!sprite)

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

  66. #endif

  67. 

  68.     /* Disable cursor */

  69.     caca_set_mouse(dp, 0);

  70. 

  71.     /* Main menu */

  72.     display_menu();

  73.     caca_refresh_display(dp);

  74. 

  75.     /* Go ! */

  76.     while(!quit)

  77.     {

  78.         caca_event_t ev;

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

  80. 

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

  82.         {

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

  84.             {

  85.                 menu = 1;

  86.                 demo = NULL;

  87.             }

  88.             else if(ev.type & CACA_EVENT_KEY_PRESS)

  89.             {

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

  91.                 {

  92.                 case 'q':

  93.                 case 'Q':

  94.                     demo = NULL;

  95.                     quit = 1;

  96.                     break;

  97.                 case 'o':

  98.                 case 'O':

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

  100.                     display_menu();

  101.                     break;

  102.                 case 'b':

  103.                 case 'B':

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

  105.                     display_menu();

  106.                     break;

  107. #if 0

  108.                 case 'd':

  109.                 case 'D':

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

  111.                     cucul_set_feature(cv, dithering);

  112.                     display_menu();

  113.                     break;

  114. #endif

  115.                 case 'c':

  116.                     demo = demo_color;

  117.                     break;

  118.                 case 'f':

  119.                 case 'F':

  120.                     demo = demo_all;

  121.                     break;

  122.                 case '1':

  123.                     demo = demo_dots;

  124.                     break;

  125.                 case '2':

  126.                     demo = demo_lines;

  127.                     break;

  128.                 case '3':

  129.                     demo = demo_boxes;

  130.                     break;

  131.                 case '4':

  132.                     demo = demo_triangles;

  133.                     break;

  134.                 case '5':

  135.                     demo = demo_ellipses;

  136.                     break;

  137. #if 0

  138.                 case 's':

  139.                 case 'S':

  140.                     if(sprite)

  141.                         demo = demo_sprites;

  142.                     break;

  143. #endif

  144.                 case 'r':

  145.                 case 'R':

  146.                     demo = demo_render;

  147.                     break;

  148.                 }

  149. 

  150.                 if(demo)

  151.                 {

  152.                     cucul_set_color(cv, CUCUL_COLOR_LIGHTGRAY, CUCUL_COLOR_BLACK);

  153.                     cucul_clear_canvas(cv);

  154.                 }

  155.             }

  156.             else if(ev.type & CACA_EVENT_MOUSE_MOTION)

  157.             {

  158.                 mouse = 1;

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

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

  161.             }

  162.             else if(ev.type & CACA_EVENT_RESIZE)

  163.             {

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

  165.             }

  166.         }

  167. 

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

  169.         {

  170.             display_menu();

  171.             if(mouse && !demo)

  172.             {

  173.                 cucul_set_color(cv, CUCUL_COLOR_RED, CUCUL_COLOR_BLACK);

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

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

  176.             }

  177.             caca_refresh_display(dp);

  178.             mouse = menu = 0;

  179.         }

  180. 

  181.         if(demo)

  182.         {

  183.             demo();

  184. 

  185.             cucul_set_color(cv, CUCUL_COLOR_LIGHTGRAY, CUCUL_COLOR_BLACK);

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

  187.                                           cucul_get_canvas_height(cv) - 2);

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

  189.                          1000000 / caca_get_rendertime(dp),

  190.                          (10000000 / caca_get_rendertime(dp)) % 10);

  191.             caca_refresh_display(dp);

  192.         }

  193.     }

  194. 

  195.     /* Clean up */

  196. #if 0

  197.     cucul_free_sprite(sprite);

  198. #endif

  199.     caca_free_display(dp);

  200.     cucul_free_canvas(cv);

  201. 

  202.     return 0;

  203. }

  204. 

  205. static void display_menu(void)

  206. {

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

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

  209. 

  210.     cucul_set_color(cv, CUCUL_COLOR_LIGHTGRAY, CUCUL_COLOR_BLACK);

  211.     cucul_clear_canvas(cv);

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

  213. 

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

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

  216. 

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

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

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

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

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

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

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

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

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

  226. #if 0

  227.     if(sprite)

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

  229. #endif

  230. 

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

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

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

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

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

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

  237.     //             cucul_get_feature_name(dithering));

  238. 

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

  240. 

  241.     caca_refresh_display(dp);

  242. }

  243. 

  244. static void demo_all(void)

  245. {

  246.     static int i = 0;

  247. 

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

  249. 

  250.     i++;

  251. 

  252.     cucul_set_color(cv, CUCUL_COLOR_LIGHTGRAY, CUCUL_COLOR_BLACK);

  253.     cucul_clear_canvas(cv);

  254. 

  255.     /* Draw the sun */

  256.     cucul_set_color(cv, CUCUL_COLOR_YELLOW, CUCUL_COLOR_BLACK);

  257.     xo = cucul_get_canvas_width(cv) / 4;

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

  259. 

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

  261.     {

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

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

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

  265.     }

  266. 

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

  268.     cucul_set_color(cv, CUCUL_COLOR_WHITE, CUCUL_COLOR_BLACK);

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

  270.     cucul_set_color(cv, CUCUL_COLOR_YELLOW, CUCUL_COLOR_BLACK);

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

  272. 

  273.     /* Draw the pyramid */

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

  275.     yo = 2;

  276. 

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

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

  279. 

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

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

  282. 

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

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

  285. 

  286.     cucul_set_color(cv, CUCUL_COLOR_GREEN, CUCUL_COLOR_BLACK);

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

  288.     cucul_set_color(cv, CUCUL_COLOR_YELLOW, CUCUL_COLOR_BLACK);

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

  290. 

  291.     cucul_set_color(cv, CUCUL_COLOR_RED, CUCUL_COLOR_BLACK);

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

  293.     cucul_set_color(cv, CUCUL_COLOR_YELLOW, CUCUL_COLOR_BLACK);

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

  295. 

  296.     cucul_set_color(cv, CUCUL_COLOR_BLUE, CUCUL_COLOR_BLACK);

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

  298.     cucul_set_color(cv, CUCUL_COLOR_YELLOW, CUCUL_COLOR_BLACK);

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

  300. 

  301.     /* Draw a background triangle */

  302.     xa = 2;

  303.     ya = 2;

  304. 

  305.     xb = cucul_get_canvas_width(cv) - 3;

  306.     yb = cucul_get_canvas_height(cv) / 2;

  307. 

  308.     xc = cucul_get_canvas_width(cv) / 3;

  309.     yc = cucul_get_canvas_height(cv) - 3;

  310. 

  311.     cucul_set_color(cv, CUCUL_COLOR_CYAN, CUCUL_COLOR_BLACK);

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

  313. 

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

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

  316. 

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

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

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

  320. 

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

  322. #if 0

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

  324. #endif

  325. 

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

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

  328.     {

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

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

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

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

  333.                    cucul_get_canvas_height(cv) / 2

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

  335.                    '#');

  336.     }

  337. 

  338.     /* Draw foreground sprite */

  339. #if 0

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

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

  342.                    sprite, 0);

  343. #endif

  344. }

  345. 

  346. static void demo_dots(void)

  347. {

  348.     int xmax = cucul_get_canvas_width(cv);

  349.     int ymax = cucul_get_canvas_height(cv);

  350.     int i;

  351.     static char chars[10] =

  352.     {

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

  354.     };

  355. 

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

  357.     {

  358.         /* Putpixel */

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

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

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

  362.     }

  363. }

  364. 

  365. static void demo_color(void)

  366. {

  367.     int i, j;

  368.     char buf[BUFSIZ];

  369. 

  370.     cucul_set_color(cv, CUCUL_COLOR_LIGHTGRAY, CUCUL_COLOR_BLACK);

  371.     cucul_clear_canvas(cv);

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

  373.     {

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

  375.         cucul_set_color(cv, CUCUL_COLOR_LIGHTGRAY, CUCUL_COLOR_BLACK);

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

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

  378.         {

  379.             cucul_set_color(cv, i, j);

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

  381.         }

  382.     }

  383. }

  384. 

  385. static void demo_lines(void)

  386. {

  387.     int w = cucul_get_canvas_width(cv);

  388.     int h = cucul_get_canvas_height(cv);

  389.     int xa, ya, xb, yb;

  390. 

  391.     if(bounds)

  392.     {

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

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

  395.     }

  396.     else

  397.     {

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

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

  400.     }

  401. 

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

  403.     if(outline > 1)

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

  405.     else

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

  407. }

  408. 

  409. static void demo_boxes(void)

  410. {

  411.     int w = cucul_get_canvas_width(cv);

  412.     int h = cucul_get_canvas_height(cv);

  413.     int xa, ya, xb, yb;

  414. 

  415.     if(bounds)

  416.     {

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

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

  419.     }

  420.     else

  421.     {

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

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

  424.     }

  425. 

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

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

  428. 

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

  430.     if(outline == 2)

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

  432.     else if(outline == 1)

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

  434. }

  435. 

  436. static void demo_ellipses(void)

  437. {

  438.     int w = cucul_get_canvas_width(cv);

  439.     int h = cucul_get_canvas_height(cv);

  440.     int x, y, a, b;

  441. 

  442.     if(bounds)

  443.     {

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

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

  446.     }

  447.     else

  448.     {

  449.         do

  450.         {

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

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

  453. 

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

  455.     }

  456. 

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

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

  459. 

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

  461.     if(outline == 2)

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

  463.     else if(outline == 1)

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

  465. }

  466. 

  467. static void demo_triangles(void)

  468. {

  469.     int w = cucul_get_canvas_width(cv);

  470.     int h = cucul_get_canvas_height(cv);

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

  472. 

  473.     if(bounds)

  474.     {

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

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

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

  478.     }

  479.     else

  480.     {

  481. 

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

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

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

  485.     }

  486. 

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

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

  489. 

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

  491.     if(outline == 2)

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

  493.     else if(outline == 1)

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

  495. }

  496. 

  497. static void demo_sprites(void)

  498. {

  499. #if 0

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

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

  502. #endif

  503. }

  504. 

  505. #if 0

  506. static void demo_render(void)

  507. {

  508.     cucul_dither_t *dither;

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

  510.     //short *dest = buffer;

  511.     int buffer[256*256];

  512.     int *dest = buffer;

  513.     int x, y, z;

  514.     static int i = 0;

  515. 

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

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

  518. 

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

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

  521.     {

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

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

  524.     }

  525.     cucul_set_dither_invert(dither, 1);

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

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

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

  529.                      dither, buffer);

  530.     cucul_free_dither(dither);

  531. }

  532. #endif

  533. 

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

  535. 

  536. static void demo_render(void)

  537. {

  538.     cucul_dither_t *dither;

  539.     int buffer[256*256];

  540.     int *dest;

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

  542.     static int i = 0;

  543. 

  544.     i++;

  545. 

  546.     dest = buffer;

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

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

  549.     {

  550.         *dest++ = 0xff000000;

  551.     }

  552. 

  553.     /* red */

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

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

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

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

  558. 

  559.     /* green */

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

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

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

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

  564. 

  565.     /* blue */

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

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

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

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

  570. 

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

  572.  cucul_set_dither_invert(dither, 1);

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

  574.     cucul_free_dither(dither);

  575. }

  576. 

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

  578. {

  579.     int t, dx, dy;

  580. 

  581. #define POINT(X,Y) \

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

  583. 

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

  585.     {

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

  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. 

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

  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. 

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

  597.     }

  598. }