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libcaca/examples/demo0.c

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  1. /*

  2.  *  demo          demo for libcaca version 0.9

  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 GNU Lesser General Public

  10.  *  License as published by the Free Software Foundation; either

  11.  *  version 2 of the License, or (at your option) any later version.

  12.  *

  13.  *  This program is distributed in the hope that it will be useful,

  14.  *  but WITHOUT ANY WARRANTY; without even the implied warranty of

  15.  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  16.  *  Lesser General Public License for more details.

  17.  *

  18.  *  You should have received a copy of the GNU Lesser General Public

  19.  *  License along with this program; if not, write to the Free Software

  20.  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

  21.  *  02111-1307  USA

  22.  */

  23. 

  24. #include "config.h"

  25. 

  26. #if !defined(__KERNEL__)

  27. #   include <math.h>

  28. #   include <string.h>

  29. #   include <stdio.h>

  30. #endif

  31. 

  32. #include "caca0.h"

  33. 

  34. static void display_menu(void);

  35. 

  36. static void demo_all(void);

  37. 

  38. static void demo_color(void);

  39. static void demo_dots(void);

  40. static void demo_lines(void);

  41. static void demo_boxes(void);

  42. static void demo_ellipses(void);

  43. static void demo_triangles(void);

  44. #if 0

  45. static void demo_sprites(void);

  46. #endif

  47. static void demo_render(void);

  48. 

  49. int bounds = 0;

  50. int outline = 0;

  51. int dithering = 0;

  52. struct caca_sprite *sprite = NULL;

  53. 

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

  55. {

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

  57.     int quit = 0;

  58. 

  59.     if(caca_init())

  60.         return 1;

  61. 

  62.     caca_set_delay(40000);

  63. 

  64.     /* Initialize data */

  65. #if 0

  66.     sprite = caca_load_sprite(DATADIR "/caca.txt");

  67.     if(!sprite)

  68.         sprite = caca_load_sprite("caca.txt");

  69.     if(!sprite)

  70.         sprite = caca_load_sprite("examples/caca.txt");

  71. #endif

  72. 

  73.     /* Main menu */

  74.     display_menu();

  75. 

  76.     /* Go ! */

  77.     while(!quit)

  78.     {

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

  80.         int event;

  81. 

  82.         while((event = caca_get_event(CACA_EVENT_ANY)))

  83.         {

  84.             if(demo && (event & CACA_EVENT_KEY_PRESS))

  85.             {

  86.                 menu = 1;

  87.                 demo = NULL;

  88.             }

  89.             else if(event & CACA_EVENT_KEY_PRESS)

  90.             {

  91.                 switch(event & 0xffff)

  92.                 {

  93.                 case 'q':

  94.                 case 'Q':

  95.                 case CACA_KEY_ESCAPE:

  96.                     demo = NULL;

  97.                     quit = 1;

  98.                     break;

  99.                 case 'o':

  100.                 case 'O':

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

  102.                     display_menu();

  103.                     break;

  104.                 case 'b':

  105.                 case 'B':

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

  107.                     display_menu();

  108.                     break;

  109.                 case 'd':

  110.                 case 'D':

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

  112.                     caca_set_dithering(CACA_DITHERING_NONE + dithering);

  113.                     display_menu();

  114.                     break;

  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.                     caca_clear();

  152.             }

  153.             else if(event & CACA_EVENT_MOUSE_MOTION)

  154.             {

  155.                 mouse = 1;

  156.                 xmouse = (event & 0xfff000) >> 12;

  157.                 ymouse = event & 0xfff;

  158.             }

  159.         }

  160. 

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

  162.         {

  163.             display_menu();

  164.             if(mouse && !demo)

  165.             {

  166.                 caca_set_color(CACA_COLOR_RED, CACA_COLOR_BLACK);

  167.                 caca_putstr(xmouse, ymouse, "|\\");

  168.             }

  169.             caca_refresh();

  170.             mouse = menu = 0;

  171.         }

  172. 

  173.         if(demo)

  174.         {

  175.             demo();

  176. 

  177.             caca_set_color(CACA_COLOR_LIGHTGRAY, CACA_COLOR_BLACK);

  178.             caca_draw_thin_box(1, 1, caca_get_width() - 2, caca_get_height() - 2);

  179.             caca_printf(4, 1, "[%i.%i fps]----",

  180.                             1000000 / caca_get_rendertime(),

  181.                             (10000000 / caca_get_rendertime()) % 10);

  182.             caca_refresh();

  183.         }

  184.     }

  185. 

  186.     /* Clean up */

  187. #if 0

  188.     caca_free_sprite(sprite);

  189. #endif

  190.     caca_end();

  191. 

  192.     return 0;

  193. }

  194. 

  195. static void display_menu(void)

  196. {

  197.     int xo = caca_get_width() - 2;

  198.     int yo = caca_get_height() - 2;

  199. 

  200.     caca_clear();

  201.     caca_set_color(CACA_COLOR_LIGHTGRAY, CACA_COLOR_BLACK);

  202.     caca_draw_thin_box(1, 1, xo, yo);

  203. 

  204.     caca_putstr((xo - strlen("libcaca demo")) / 2, 3, "libcaca demo");

  205.     caca_putstr((xo - strlen("==============")) / 2, 4, "==============");

  206. 

  207.     caca_putstr(4, 6, "demos:");

  208.     caca_putstr(4, 7, "'f': full");

  209.     caca_putstr(4, 8, "'1': dots");

  210.     caca_putstr(4, 9, "'2': lines");

  211.     caca_putstr(4, 10, "'3': boxes");

  212.     caca_putstr(4, 11, "'4': triangles");

  213.     caca_putstr(4, 12, "'5': ellipses");

  214.     caca_putstr(4, 13, "'c': colour");

  215.     caca_putstr(4, 14, "'r': render");

  216.     if(sprite)

  217.         caca_putstr(4, 15, "'s': sprites");

  218. 

  219.     caca_putstr(4, 16, "settings:");

  220.     caca_printf(4, 17, "'o': outline: %s",

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

  222.     caca_printf(4, 18, "'b': drawing boundaries: %s",

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

  224.     caca_printf(4, 19, "'d': dithering (%s)",

  225.                 caca_get_dithering_name(CACA_DITHERING_NONE + dithering));

  226. 

  227.     caca_putstr(4, yo - 2, "'q': quit");

  228.     caca_refresh();

  229. }

  230. 

  231. static void demo_all(void)

  232. {

  233.     static int i = 0;

  234. 

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

  236. 

  237.     i++;

  238. 

  239.     caca_clear();

  240. 

  241.     /* Draw the sun */

  242.     caca_set_color(CACA_COLOR_YELLOW, CACA_COLOR_BLACK);

  243.     xo = caca_get_width() / 4;

  244.     yo = caca_get_height() / 4 + 5 * sin(0.03*i);

  245. 

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

  247.     {

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

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

  250.         caca_draw_thin_line(xo, yo, xa, ya);

  251.     }

  252. 

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

  254.     caca_set_color(CACA_COLOR_WHITE, CACA_COLOR_BLACK);

  255.     caca_fill_ellipse(xo, yo, j, j / 2, '#');

  256.     caca_set_color(CACA_COLOR_YELLOW, CACA_COLOR_BLACK);

  257.     caca_draw_ellipse(xo, yo, j, j / 2, '#');

  258. 

  259.     /* Draw the pyramid */

  260.     xo = caca_get_width() * 5 / 8;

  261.     yo = 2;

  262. 

  263.     xa = caca_get_width() / 8 + sin(0.03*i) * 5;

  264.     ya = caca_get_height() / 2 + cos(0.03*i) * 5;

  265. 

  266.     xb = caca_get_width() - 10 - cos(0.02*i) * 10;

  267.     yb = caca_get_height() * 3 / 4 - 5 + sin(0.02*i) * 5;

  268. 

  269.     xc = caca_get_width() / 4 - sin(0.02*i) * 5;

  270.     yc = caca_get_height() * 3 / 4 + cos(0.02*i) * 5;

  271. 

  272.     caca_set_color(CACA_COLOR_GREEN, CACA_COLOR_BLACK);

  273.     caca_fill_triangle(xo, yo, xb, yb, xa, ya, '%');

  274.     caca_set_color(CACA_COLOR_YELLOW, CACA_COLOR_BLACK);

  275.     caca_draw_thin_triangle(xo, yo, xb, yb, xa, ya);

  276. 

  277.     caca_set_color(CACA_COLOR_RED, CACA_COLOR_BLACK);

  278.     caca_fill_triangle(xa, ya, xb, yb, xc, yc, '#');

  279.     caca_set_color(CACA_COLOR_YELLOW, CACA_COLOR_BLACK);

  280.     caca_draw_thin_triangle(xa, ya, xb, yb, xc, yc);

  281. 

  282.     caca_set_color(CACA_COLOR_BLUE, CACA_COLOR_BLACK);

  283.     caca_fill_triangle(xo, yo, xb, yb, xc, yc, '%');

  284.     caca_set_color(CACA_COLOR_YELLOW, CACA_COLOR_BLACK);

  285.     caca_draw_thin_triangle(xo, yo, xb, yb, xc, yc);

  286. 

  287.     /* Draw a background triangle */

  288.     xa = 2;

  289.     ya = 2;

  290. 

  291.     xb = caca_get_width() - 3;

  292.     yb = caca_get_height() / 2;

  293. 

  294.     xc = caca_get_width() / 3;

  295.     yc = caca_get_height() - 3;

  296. 

  297.     caca_set_color(CACA_COLOR_CYAN, CACA_COLOR_BLACK);

  298.     caca_draw_thin_triangle(xa, ya, xb, yb, xc, yc);

  299. 

  300.     xo = caca_get_width() / 2 + cos(0.027*i) * caca_get_width() / 3;

  301.     yo = caca_get_height() / 2 - sin(0.027*i) * caca_get_height() / 2;

  302. 

  303.     caca_draw_thin_line(xa, ya, xo, yo);

  304.     caca_draw_thin_line(xb, yb, xo, yo);

  305.     caca_draw_thin_line(xc, yc, xo, yo);

  306. 

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

  308. #if 0

  309.     caca_draw_sprite(xo, yo, sprite, 0);

  310. #endif

  311. 

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

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

  314.     {

  315.         int delta = caca_rand(-5, 5);

  316.         caca_set_color(caca_rand(0, 15), caca_rand(0, 15));

  317.         caca_putchar(caca_get_width() / 2

  318.                     + cos(0.02*j) * (delta + caca_get_width() / 4),

  319.                    caca_get_height() / 2

  320.                     + sin(0.02*j) * (delta + caca_get_height() / 3),

  321.                    '#');

  322.     }

  323. 

  324.     /* Draw foreground sprite */

  325. #if 0

  326.     caca_draw_sprite(caca_get_width() / 2 + cos(0.02*i) * caca_get_width() / 4,

  327.                    caca_get_height() / 2 + sin(0.02*i) * caca_get_height() / 3,

  328.                    sprite, 0);

  329. #endif

  330. }

  331. 

  332. static void demo_dots(void)

  333. {

  334.     int xmax = caca_get_width() - 1;

  335.     int ymax = caca_get_height() - 1;

  336.     int i;

  337.     static char chars[10] =

  338.     {

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

  340.     };

  341. 

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

  343.     {

  344.         /* Putpixel */

  345.         caca_set_color(caca_rand(0, 15), caca_rand(0, 15));

  346.         caca_putchar(caca_rand(0, xmax), caca_rand(0, ymax),

  347.                      chars[caca_rand(0, 9)]);

  348.     }

  349. }

  350. 

  351. static void demo_color(void)

  352. {

  353.     int i, j;

  354.     char buf[BUFSIZ];

  355. 

  356.     caca_clear();

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

  358.     {

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

  360.         caca_set_color(CACA_COLOR_LIGHTGRAY, CACA_COLOR_BLACK);

  361.         caca_putstr(4, i + (i >= 8 ? 4 : 3), buf);

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

  363.         {

  364.             caca_set_color(i, j);

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

  366.         }

  367.     }

  368. }

  369. 

  370. static void demo_lines(void)

  371. {

  372.     int w = caca_get_width();

  373.     int h = caca_get_height();

  374.     int xa, ya, xb, yb;

  375. 

  376.     if(bounds)

  377.     {

  378.         xa = caca_rand(- w, 2 * w); ya = caca_rand(- h, 2 * h);

  379.         xb = caca_rand(- w, 2 * w); yb = caca_rand(- h, 2 * h);

  380.     }

  381.     else

  382.     {

  383.         xa = caca_rand(0, w - 1); ya = caca_rand(0, h - 1);

  384.         xb = caca_rand(0, w - 1); yb = caca_rand(0, h - 1);

  385.     }

  386. 

  387.     caca_set_color(caca_rand(0, 15), CACA_COLOR_BLACK);

  388.     if(outline > 1)

  389.         caca_draw_thin_line(xa, ya, xb, yb);

  390.     else

  391.         caca_draw_line(xa, ya, xb, yb, '#');

  392. }

  393. 

  394. static void demo_boxes(void)

  395. {

  396.     int w = caca_get_width();

  397.     int h = caca_get_height();

  398.     int xa, ya, xb, yb;

  399. 

  400.     if(bounds)

  401.     {

  402.         xa = caca_rand(- w, 2 * w); ya = caca_rand(- h, 2 * h);

  403.         xb = caca_rand(- w, 2 * w); yb = caca_rand(- h, 2 * h);

  404.     }

  405.     else

  406.     {

  407.         xa = caca_rand(0, w - 1); ya = caca_rand(0, h - 1);

  408.         xb = caca_rand(0, w - 1); yb = caca_rand(0, h - 1);

  409.     }

  410. 

  411.     caca_set_color(caca_rand(0, 15), caca_rand(0, 15));

  412.     caca_fill_box(xa, ya, xb, yb, '#');

  413. 

  414.     caca_set_color(caca_rand(0, 15), CACA_COLOR_BLACK);

  415.     if(outline == 2)

  416.         caca_draw_thin_box(xa, ya, xb, yb);

  417.     else if(outline == 1)

  418.         caca_draw_box(xa, ya, xb, yb, '#');

  419. }

  420. 

  421. static void demo_ellipses(void)

  422. {

  423.     int w = caca_get_width();

  424.     int h = caca_get_height();

  425.     int x, y, a, b;

  426. 

  427.     if(bounds)

  428.     {

  429.         x = caca_rand(- w, 2 * w); y = caca_rand(- h, 2 * h);

  430.         a = caca_rand(0, w); b = caca_rand(0, h);

  431.     }

  432.     else

  433.     {

  434.         do

  435.         {

  436.             x = caca_rand(0, w); y = caca_rand(0, h);

  437.             a = caca_rand(0, w); b = caca_rand(0, h);

  438. 

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

  440.     }

  441. 

  442.     caca_set_color(caca_rand(0, 15), caca_rand(0, 15));

  443.     caca_fill_ellipse(x, y, a, b, '#');

  444. 

  445.     caca_set_color(caca_rand(0, 15), CACA_COLOR_BLACK);

  446.     if(outline == 2)

  447.         caca_draw_thin_ellipse(x, y, a, b);

  448.     else if(outline == 1)

  449.         caca_draw_ellipse(x, y, a, b, '#');

  450. }

  451. 

  452. static void demo_triangles(void)

  453. {

  454.     int w = caca_get_width();

  455.     int h = caca_get_height();

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

  457. 

  458.     if(bounds)

  459.     {

  460.         xa = caca_rand(- w, 2 * w); ya = caca_rand(- h, 2 * h);

  461.         xb = caca_rand(- w, 2 * w); yb = caca_rand(- h, 2 * h);

  462.         xc = caca_rand(- w, 2 * w); yc = caca_rand(- h, 2 * h);

  463.     }

  464.     else

  465.     {

  466. 

  467.         xa = caca_rand(0, w - 1); ya = caca_rand(0, h - 1);

  468.         xb = caca_rand(0, w - 1); yb = caca_rand(0, h - 1);

  469.         xc = caca_rand(0, w - 1); yc = caca_rand(0, h - 1);

  470.     }

  471. 

  472.     caca_set_color(caca_rand(0, 15), caca_rand(0, 15));

  473.     caca_fill_triangle(xa, ya, xb, yb, xc, yc, '#');

  474. 

  475.     caca_set_color(caca_rand(0, 15), CACA_COLOR_BLACK);

  476.     if(outline == 2)

  477.         caca_draw_thin_triangle(xa, ya, xb, yb, xc, yc);

  478.     else if(outline == 1)

  479.         caca_draw_triangle(xa, ya, xb, yb, xc, yc, '#');

  480. }

  481. 

  482. #if 0

  483. static void demo_sprites(void)

  484. {

  485.     caca_draw_sprite(caca_rand(0, caca_get_width() - 1),

  486.                    caca_rand(0, caca_get_height() - 1), sprite, 0);

  487. }

  488. #endif

  489. 

  490. #if 0

  491. static void demo_render(void)

  492. {

  493.     struct caca_bitmap *bitmap;

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

  495.     //short *dest = buffer;

  496.     int buffer[256*256];

  497.     int *dest = buffer;

  498.     int x, y, z;

  499.     static int i = 0;

  500. 

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

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

  503. 

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

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

  506.     {

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

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

  509.     }

  510. 

  511.     //bitmap = caca_create_bitmap(16, 256, 256, 2 * 256, 0xf800, 0x07e0, 0x001f, 0x0000);

  512.     bitmap = caca_create_bitmap(32, 256, 256, 4 * 256, 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000);

  513.     caca_draw_bitmap(0, 0, caca_get_width() - 1, caca_get_height() - 1,

  514.                      bitmap, buffer);

  515.     caca_free_bitmap(bitmap);

  516. }

  517. #endif

  518. 

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

  520. 

  521. static void demo_render(void)

  522. {

  523.     struct caca_bitmap *bitmap;

  524.     int buffer[256*256];

  525.     int *dest;

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

  527.     static int i = 0;

  528. 

  529.     i++;

  530. 

  531.     dest = buffer;

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

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

  534.     {

  535.         *dest++ = 0xff000000;

  536.     }

  537. 

  538.     /* red */

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

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

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

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

  543. 

  544.     /* green */

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

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

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

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

  549. 

  550.     /* blue */

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

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

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

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

  555. 

  556.     bitmap = caca_create_bitmap(32, 256, 256, 4 * 256, 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000);

  557.     caca_draw_bitmap(0, 0, caca_get_width() - 1, caca_get_height() - 1,

  558.                      bitmap, (char *)buffer);

  559.     caca_free_bitmap(bitmap);

  560. }

  561. 

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

  563. {

  564.     int t, dx, dy;

  565. 

  566. #define POINT(X,Y) \

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

  568. 

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

  570.     {

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

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

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

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

  575. 

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

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

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

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

  580. 

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

  582.     }

  583. }