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libcaca/examples/demo.c

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  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 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. #include <math.h>

  27. #include <string.h>

  28. #include <stdio.h>

  29. 

  30. #include "caca.h"

  31. 

  32. static void display_menu(void);

  33. 

  34. static void demo_all(void);

  35. 

  36. static void demo_color(void);

  37. static void demo_dots(void);

  38. static void demo_lines(void);

  39. static void demo_boxes(void);

  40. static void demo_ellipses(void);

  41. static void demo_triangles(void);

  42. static void demo_sprites(void);

  43. static void demo_render(void);

  44. 

  45. int bounds = 0;

  46. int outline = 0;

  47. int dithering = 0;

  48. struct caca_sprite *sprite = NULL;

  49. 

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

  51. {

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

  53.     int quit = 0;

  54. 

  55.     if(caca_init())

  56.         return 1;

  57. 

  58.     caca_set_delay(40000);

  59. 

  60.     /* Initialize data */

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

  62.     if(!sprite)

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

  64.     if(!sprite)

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

  66. 

  67.     /* Main menu */

  68.     display_menu();

  69.     caca_refresh();

  70. 

  71.     /* Go ! */

  72.     while(!quit)

  73.     {

  74.         int event = caca_get_event();

  75. 

  76.         if(event && demo)

  77.         {

  78.             display_menu();

  79.             caca_refresh();

  80.             demo = NULL;

  81.         }

  82.         else if(event & CACA_EVENT_KEY_PRESS)

  83.         {

  84.         handle_key:

  85.             switch(event & 0xffff)

  86.             {

  87.             case 'q':

  88.             case 'Q':

  89.                 demo = NULL;

  90.                 quit = 1;

  91.                 break;

  92.             case 'o':

  93.             case 'O':

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

  95.                 display_menu();

  96.                 break;

  97.             case 'b':

  98.             case 'B':

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

  100.                 display_menu();

  101.                 break;

  102.             case 'd':

  103.             case 'D':

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

  105.                 caca_set_dithering(dithering);

  106.                 display_menu();

  107.                 break;

  108.             case 'c':

  109.                 demo = demo_color;

  110.                 break;

  111.             case 'f':

  112.             case 'F':

  113.                 demo = demo_all;

  114.                 break;

  115.             case '1':

  116.                 demo = demo_dots;

  117.                 break;

  118.             case '2':

  119.                 demo = demo_lines;

  120.                 break;

  121.             case '3':

  122.                 demo = demo_boxes;

  123.                 break;

  124.             case '4':

  125.                 demo = demo_triangles;

  126.                 break;

  127.             case '5':

  128.                 demo = demo_ellipses;

  129.                 break;

  130.             case 's':

  131.             case 'S':

  132.                 if(sprite)

  133.                     demo = demo_sprites;

  134.                 break;

  135.             case 'r':

  136.             case 'R':

  137.                 demo = demo_render;

  138.                 break;

  139.             }

  140. 

  141.         handle_event:

  142.             event = caca_get_event();

  143.             if(event & CACA_EVENT_KEY_PRESS)

  144.                 goto handle_key;

  145.             else if(event)

  146.                 goto handle_event;

  147. 

  148.             caca_refresh();

  149. 

  150.             if(demo)

  151.                 caca_clear();

  152.         }

  153.         else if(event & CACA_EVENT_MOUSE_CLICK)

  154.         {

  155.             display_menu();

  156.             caca_set_color(CACA_COLOR_RED, CACA_COLOR_BLACK);

  157.             caca_putstr((event & 0xff00) >> 8, event & 0xff, "|\\");

  158.             caca_refresh();

  159.         }

  160. 

  161.         if(demo)

  162.         {

  163.             demo();

  164. 

  165.             caca_set_color(CACA_COLOR_LIGHTGRAY, CACA_COLOR_BLACK);

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

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

  168.                             1000000 / caca_get_rendertime(),

  169.                             (10000000 / caca_get_rendertime()) % 10);

  170.             caca_refresh();

  171.         }

  172.     }

  173. 

  174.     /* Clean up */

  175.     caca_free_sprite(sprite);

  176.     caca_end();

  177. 

  178.     return 0;

  179. }

  180. 

  181. static void display_menu(void)

  182. {

  183.     int xo = caca_get_width() - 2;

  184.     int yo = caca_get_height() - 2;

  185. 

  186.     caca_clear();

  187.     caca_set_color(CACA_COLOR_LIGHTGRAY, CACA_COLOR_BLACK);

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

  189. 

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

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

  192. 

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

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

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

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

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

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

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

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

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

  202.     if(sprite)

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

  204. 

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

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

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

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

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

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

  211.                 caca_get_dithering_name(dithering));

  212. 

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

  214. }

  215. 

  216. static void demo_all(void)

  217. {

  218.     static int i = 0;

  219. 

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

  221. 

  222.     i++;

  223. 

  224.     caca_clear();

  225. 

  226.     /* Draw the sun */

  227.     caca_set_color(CACA_COLOR_YELLOW, CACA_COLOR_BLACK);

  228.     xo = caca_get_width() / 4;

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

  230. 

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

  232.     {

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

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

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

  236.     }

  237. 

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

  239.     caca_set_color(CACA_COLOR_WHITE, CACA_COLOR_BLACK);

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

  241.     caca_set_color(CACA_COLOR_YELLOW, CACA_COLOR_BLACK);

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

  243. 

  244.     /* Draw the pyramid */

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

  246.     yo = 2;

  247. 

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

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

  250. 

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

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

  253. 

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

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

  256. 

  257.     caca_set_color(CACA_COLOR_GREEN, CACA_COLOR_BLACK);

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

  259.     caca_set_color(CACA_COLOR_YELLOW, CACA_COLOR_BLACK);

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

  261. 

  262.     caca_set_color(CACA_COLOR_RED, CACA_COLOR_BLACK);

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

  264.     caca_set_color(CACA_COLOR_YELLOW, CACA_COLOR_BLACK);

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

  266. 

  267.     caca_set_color(CACA_COLOR_BLUE, CACA_COLOR_BLACK);

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

  269.     caca_set_color(CACA_COLOR_YELLOW, CACA_COLOR_BLACK);

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

  271. 

  272.     /* Draw a background triangle */

  273.     xa = 2;

  274.     ya = 2;

  275. 

  276.     xb = caca_get_width() - 3;

  277.     yb = caca_get_height() / 2;

  278. 

  279.     xc = caca_get_width() / 3;

  280.     yc = caca_get_height() - 3;

  281. 

  282.     caca_set_color(CACA_COLOR_CYAN, CACA_COLOR_BLACK);

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

  284. 

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

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

  287. 

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

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

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

  291. 

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

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

  294. 

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

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

  297.     {

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

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

  300.         caca_putchar(caca_get_width() / 2

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

  302.                    caca_get_height() / 2

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

  304.                    '#');

  305.     }

  306. 

  307.     /* Draw foreground sprite */

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

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

  310.                    sprite, 0);

  311. }

  312. 

  313. static void demo_dots(void)

  314. {

  315.     int xmax = caca_get_width() - 1;

  316.     int ymax = caca_get_height() - 1;

  317.     int i;

  318.     static char chars[10] =

  319.     {

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

  321.     };

  322. 

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

  324.     {

  325.         /* Putpixel */

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

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

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

  329.     }

  330. }

  331. 

  332. static void demo_color(void)

  333. {

  334.     int i, j;

  335.     char buf[BUFSIZ];

  336. 

  337.     caca_clear();

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

  339.     {

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

  341.         caca_set_color(CACA_COLOR_LIGHTGRAY, CACA_COLOR_BLACK);

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

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

  344.         {

  345.             caca_set_color(i, j);

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

  347.         }

  348.     }

  349. }

  350. 

  351. static void demo_lines(void)

  352. {

  353.     int w = caca_get_width();

  354.     int h = caca_get_height();

  355.     int xa, ya, xb, yb;

  356. 

  357.     if(bounds)

  358.     {

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

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

  361.     }

  362.     else

  363.     {

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

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

  366.     }

  367. 

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

  369.     if(outline > 1)

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

  371.     else

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

  373. }

  374. 

  375. static void demo_boxes(void)

  376. {

  377.     int w = caca_get_width();

  378.     int h = caca_get_height();

  379.     int xa, ya, xb, yb;

  380. 

  381.     if(bounds)

  382.     {

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

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

  385.     }

  386.     else

  387.     {

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

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

  390.     }

  391. 

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

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

  394. 

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

  396.     if(outline == 2)

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

  398.     else if(outline == 1)

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

  400. }

  401. 

  402. static void demo_ellipses(void)

  403. {

  404.     int w = caca_get_width();

  405.     int h = caca_get_height();

  406.     int x, y, a, b;

  407. 

  408.     if(bounds)

  409.     {

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

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

  412.     }

  413.     else

  414.     {

  415.         do

  416.         {

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

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

  419. 

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

  421.     }

  422. 

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

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

  425. 

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

  427.     if(outline == 2)

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

  429.     else if(outline == 1)

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

  431. }

  432. 

  433. static void demo_triangles(void)

  434. {

  435.     int w = caca_get_width();

  436.     int h = caca_get_height();

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

  438. 

  439.     if(bounds)

  440.     {

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

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

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

  444.     }

  445.     else

  446.     {

  447. 

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

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

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

  451.     }

  452. 

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

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

  455. 

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

  457.     if(outline == 2)

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

  459.     else if(outline == 1)

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

  461. }

  462. 

  463. static void demo_sprites(void)

  464. {

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

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

  467. }

  468. 

  469. #if 0

  470. static void demo_render(void)

  471. {

  472.     struct caca_bitmap *bitmap;

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

  474.     //short *dest = buffer;

  475.     int buffer[256*256];

  476.     int *dest = buffer;

  477.     int x, y, z;

  478.     static int i = 0;

  479. 

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

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

  482. 

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

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

  485.     {

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

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

  488.     }

  489. 

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

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

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

  493.                      bitmap, buffer);

  494.     caca_free_bitmap(bitmap);

  495. }

  496. #endif

  497. 

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

  499. 

  500. static void demo_render(void)

  501. {

  502.     struct caca_bitmap *bitmap;

  503.     int buffer[256*256];

  504.     int *dest;

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

  506.     static int i = 0;

  507. 

  508.     i++;

  509. 

  510.     dest = buffer;

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

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

  513.     {

  514.         *dest++ = 0xff000000;

  515.     }

  516. 

  517.     /* red */

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

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

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

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

  522. 

  523.     /* green */

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

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

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

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

  528. 

  529.     /* blue */

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

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

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

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

  534. 

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

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

  537.                      bitmap, (char *)buffer);

  538.     caca_free_bitmap(bitmap);

  539. }

  540. 

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

  542. {

  543.     int t, dx, dy;

  544. 

  545. #define POINT(X,Y) \

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

  547. 

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

  549.     {

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

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

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

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

  554. 

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

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

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

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

  559. 

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

  561.     }

  562. }