code / btui

   1 /*
   2  * This file contains the source of a program used to demonstrate BTUI's 24-bit
   3  * color support by printing a rapidfire rainbow.
   4  */
   5 #include <stdio.h>
   6 #include <math.h>
   7 #include "btui.h"
   8 
   9 int main(void)
  10 {
  11     btui_t *bt = btui_enable();
  12     if (!bt) return 1;
  13     int done = 0;
  14     double t = 0;
  15     double a1 = 1.13, a2 = 1.23, a3 = 1.37;
  16     double dt = 0.1;
  17     char buf[1<<20];
  18     setvbuf(bt->out, buf, _IOFBF, sizeof(buf));
  19     btui_puts(bt, T_OFF(T_WRAP));
  20     const char *title = " 24 BIT COLOR SUPPORT! ";
  21     while (!done) {
  22         int y = bt->height-1;
  23         btui_move_cursor(bt, 0, y);
  24         for (int x = 0; x < bt->width; x++) {
  25             int r = (int)(255.0 * (0.5 + 0.5*sin(t*a1 + (double)(x) / 50.0)));
  26             int g = (int)(255.0 * (0.5 + 0.5*sin(0.8 + t*a2 + (double)(x) / 50.0)));
  27             int b = (int)(255.0 * (0.5 + 0.5*sin(1.3 + t*a3 + (double)(x) / 50.0)));
  28             btui_set_bg(bt,
  29                         (r < 0 ? 0 : (r > 255 ? 255 : r)),
  30                         (g < 0 ? 0 : (g > 255 ? 255 : g)),
  31                         (b < 0 ? 0 : (b > 255 ? 255 : b)));
  32             btui_puts(bt, " ");
  33         }
  34         btui_puts(bt, "\n");
  35         btui_move_cursor(bt, (bt->width - (int)strlen(title)) / 2, 0);
  36         btui_set_attributes(bt, BTUI_NORMAL | BTUI_BOLD);
  37         btui_puts(bt, title);
  38         btui_flush(bt);
  39         usleep(10000);
  40         t += dt;
  41 
  42         int mouse_x = -1, mouse_y = -1;
  43         int key = btui_getkey(bt, 0, &mouse_x, &mouse_y);
  44         switch (key) {
  45             case 'q': case KEY_CTRL_C: done = 1; break;
  46             default: break;
  47         }
  48     }
  49     btui_disable(bt);
  50     return 0;
  51 }