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libcaca
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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("caca.txt");

  67.     if(!sprite)

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

  69. #endif

  70. 

  71.     /* Main menu */

  72.     display_menu();

  73. 

  74.     /* Go ! */

  75.     while(!quit)

  76.     {

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

  78.         int event;

  79. 

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

  81.         {

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

  83.             {

  84.                 menu = 1;

  85.                 demo = NULL;

  86.             }

  87.             else if(event & CACA_EVENT_KEY_PRESS)

  88.             {

  89.                 switch(event & 0xffff)

  90.                 {

  91.                 case 'q':

  92.                 case 'Q':

  93.                 case CACA_KEY_ESCAPE:

  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.                 case 'd':

  108.                 case 'D':

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

  110.                     caca_set_dithering(CACA_DITHERING_NONE + dithering);

  111.                     display_menu();

  112.                     break;

  113.                 case 'c':

  114.                     demo = demo_color;

  115.                     break;

  116.                 case 'f':

  117.                 case 'F':

  118.                     demo = demo_all;

  119.                     break;

  120.                 case '1':

  121.                     demo = demo_dots;

  122.                     break;

  123.                 case '2':

  124.                     demo = demo_lines;

  125.                     break;

  126.                 case '3':

  127.                     demo = demo_boxes;

  128.                     break;

  129.                 case '4':

  130.                     demo = demo_triangles;

  131.                     break;

  132.                 case '5':

  133.                     demo = demo_ellipses;

  134.                     break;

  135. #if 0

  136.                 case 's':

  137.                 case 'S':

  138.                     if(sprite)

  139.                         demo = demo_sprites;

  140.                     break;

  141. #endif

  142.                 case 'r':

  143.                 case 'R':

  144.                     demo = demo_render;

  145.                     break;

  146.                 }

  147. 

  148.                 if(demo)

  149.                     caca_clear();

  150.             }

  151.             else if(event & CACA_EVENT_MOUSE_MOTION)

  152.             {

  153.                 mouse = 1;

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

  155.                 ymouse = event & 0xfff;

  156.             }

  157.         }

  158. 

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

  160.         {

  161.             display_menu();

  162.             if(mouse && !demo)

  163.             {

  164.                 caca_set_color(CACA_COLOR_RED, CACA_COLOR_BLACK);

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

  166.             }

  167.             caca_refresh();

  168.             mouse = menu = 0;

  169.         }

  170. 

  171.         if(demo)

  172.         {

  173.             demo();

  174. 

  175.             caca_set_color(CACA_COLOR_LIGHTGRAY, CACA_COLOR_BLACK);

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

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

  178.                             1000000 / caca_get_rendertime(),

  179.                             (10000000 / caca_get_rendertime()) % 10);

  180.             caca_refresh();

  181.         }

  182.     }

  183. 

  184.     /* Clean up */

  185. #if 0

  186.     caca_free_sprite(sprite);

  187. #endif

  188.     caca_end();

  189. 

  190.     return 0;

  191. }

  192. 

  193. static void display_menu(void)

  194. {

  195.     int xo = caca_get_width() - 2;

  196.     int yo = caca_get_height() - 2;

  197. 

  198.     caca_clear();

  199.     caca_set_color(CACA_COLOR_LIGHTGRAY, CACA_COLOR_BLACK);

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

  201. 

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

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

  204. 

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

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

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

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

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

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

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

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

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

  214.     if(sprite)

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

  216. 

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

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

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

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

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

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

  223.                 caca_get_dithering_name(CACA_DITHERING_NONE + dithering));

  224. 

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

  226.     caca_refresh();

  227. }

  228. 

  229. static void demo_all(void)

  230. {

  231.     static int i = 0;

  232. 

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

  234. 

  235.     i++;

  236. 

  237.     caca_clear();

  238. 

  239.     /* Draw the sun */

  240.     caca_set_color(CACA_COLOR_YELLOW, CACA_COLOR_BLACK);

  241.     xo = caca_get_width() / 4;

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

  243. 

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

  245.     {

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

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

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

  249.     }

  250. 

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

  252.     caca_set_color(CACA_COLOR_WHITE, CACA_COLOR_BLACK);

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

  254.     caca_set_color(CACA_COLOR_YELLOW, CACA_COLOR_BLACK);

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

  256. 

  257.     /* Draw the pyramid */

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

  259.     yo = 2;

  260. 

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

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

  263. 

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

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

  266. 

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

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

  269. 

  270.     caca_set_color(CACA_COLOR_GREEN, CACA_COLOR_BLACK);

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

  272.     caca_set_color(CACA_COLOR_YELLOW, CACA_COLOR_BLACK);

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

  274. 

  275.     caca_set_color(CACA_COLOR_RED, CACA_COLOR_BLACK);

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

  277.     caca_set_color(CACA_COLOR_YELLOW, CACA_COLOR_BLACK);

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

  279. 

  280.     caca_set_color(CACA_COLOR_BLUE, CACA_COLOR_BLACK);

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

  282.     caca_set_color(CACA_COLOR_YELLOW, CACA_COLOR_BLACK);

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

  284. 

  285.     /* Draw a background triangle */

  286.     xa = 2;

  287.     ya = 2;

  288. 

  289.     xb = caca_get_width() - 3;

  290.     yb = caca_get_height() / 2;

  291. 

  292.     xc = caca_get_width() / 3;

  293.     yc = caca_get_height() - 3;

  294. 

  295.     caca_set_color(CACA_COLOR_CYAN, CACA_COLOR_BLACK);

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

  297. 

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

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

  300. 

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

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

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

  304. 

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

  306. #if 0

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

  308. #endif

  309. 

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

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

  312.     {

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

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

  315.         caca_putchar(caca_get_width() / 2

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

  317.                    caca_get_height() / 2

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

  319.                    '#');

  320.     }

  321. 

  322.     /* Draw foreground sprite */

  323. #if 0

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

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

  326.                    sprite, 0);

  327. #endif

  328. }

  329. 

  330. static void demo_dots(void)

  331. {

  332.     int xmax = caca_get_width() - 1;

  333.     int ymax = caca_get_height() - 1;

  334.     int i;

  335.     static char chars[10] =

  336.     {

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

  338.     };

  339. 

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

  341.     {

  342.         /* Putpixel */

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

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

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

  346.     }

  347. }

  348. 

  349. static void demo_color(void)

  350. {

  351.     int i, j;

  352.     char buf[BUFSIZ];

  353. 

  354.     caca_clear();

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

  356.     {

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

  358.         caca_set_color(CACA_COLOR_LIGHTGRAY, CACA_COLOR_BLACK);

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

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

  361.         {

  362.             caca_set_color(i, j);

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

  364.         }

  365.     }

  366. }

  367. 

  368. static void demo_lines(void)

  369. {

  370.     int w = caca_get_width();

  371.     int h = caca_get_height();

  372.     int xa, ya, xb, yb;

  373. 

  374.     if(bounds)

  375.     {

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

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

  378.     }

  379.     else

  380.     {

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

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

  383.     }

  384. 

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

  386.     if(outline > 1)

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

  388.     else

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

  390. }

  391. 

  392. static void demo_boxes(void)

  393. {

  394.     int w = caca_get_width();

  395.     int h = caca_get_height();

  396.     int xa, ya, xb, yb;

  397. 

  398.     if(bounds)

  399.     {

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

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

  402.     }

  403.     else

  404.     {

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

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

  407.     }

  408. 

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

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

  411. 

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

  413.     if(outline == 2)

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

  415.     else if(outline == 1)

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

  417. }

  418. 

  419. static void demo_ellipses(void)

  420. {

  421.     int w = caca_get_width();

  422.     int h = caca_get_height();

  423.     int x, y, a, b;

  424. 

  425.     if(bounds)

  426.     {

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

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

  429.     }

  430.     else

  431.     {

  432.         do

  433.         {

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

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

  436. 

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

  438.     }

  439. 

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

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

  442. 

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

  444.     if(outline == 2)

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

  446.     else if(outline == 1)

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

  448. }

  449. 

  450. static void demo_triangles(void)

  451. {

  452.     int w = caca_get_width();

  453.     int h = caca_get_height();

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

  455. 

  456.     if(bounds)

  457.     {

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

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

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

  461.     }

  462.     else

  463.     {

  464. 

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

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

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

  468.     }

  469. 

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

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

  472. 

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

  474.     if(outline == 2)

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

  476.     else if(outline == 1)

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

  478. }

  479. 

  480. #if 0

  481. static void demo_sprites(void)

  482. {

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

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

  485. }

  486. #endif

  487. 

  488. #if 0

  489. static void demo_render(void)

  490. {

  491.     struct caca_bitmap *bitmap;

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

  493.     //short *dest = buffer;

  494.     int buffer[256*256];

  495.     int *dest = buffer;

  496.     int x, y, z;

  497.     static int i = 0;

  498. 

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

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

  501. 

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

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

  504.     {

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

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

  507.     }

  508. 

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

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

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

  512.                      bitmap, buffer);

  513.     caca_free_bitmap(bitmap);

  514. }

  515. #endif

  516. 

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

  518. 

  519. static void demo_render(void)

  520. {

  521.     struct caca_bitmap *bitmap;

  522.     int buffer[256*256];

  523.     int *dest;

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

  525.     static int i = 0;

  526. 

  527.     i++;

  528. 

  529.     dest = buffer;

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

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

  532.     {

  533.         *dest++ = 0xff000000;

  534.     }

  535. 

  536.     /* red */

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

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

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

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

  541. 

  542.     /* green */

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

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

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

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

  547. 

  548.     /* blue */

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

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

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

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

  553. 

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

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

  556.                      bitmap, (char *)buffer);

  557.     caca_free_bitmap(bitmap);

  558. }

  559. 

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

  561. {

  562.     int t, dx, dy;

  563. 

  564. #define POINT(X,Y) \

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

  566. 

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

  568.     {

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

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

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

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

  573. 

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

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

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

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

  578. 

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

  580.     }

  581. }