Terminal screensaver/session activity bumper thing.

spin.c

/* .. spin ..
*
* $ gcc spin.c -o spin -lncurses -Wall -O3
*
* vsn - 2006
*/

#include <stdlib.h>     // srand
#include <time.h>       // time
#include <string.h>
#include <ncurses.h>
#define getrandom(min, max) ((rand() % (int)(((max-1)) - (min))) + (min))

const char
rand_char(void) {
       static const char pick[] = "*.-@'+X\",#";
       return(pick[getrandom(0, strlen(pick))]);
}

int
main(void) {

       int ch, row, col;
       int x1, y1, x2, y2;

       ch = row = col = 0;
       x1 = x2 = y1 = y2 = 1;

       srand(time(NULL));

       initscr();
       curs_set(0);
       getmaxyx(stdscr,row,col);
       noecho();
       raw();
       keypad(stdscr, TRUE);
       nodelay(stdscr, TRUE);
       refresh();

       while(1) {
               ch = getch();

               if(ch == 'q')
                       break;

               y1 = getrandom(1, row);
               x1 = getrandom(1, col);
               mvaddch(y1, x1, rand_char());
               refresh();

               mvaddch(y2, x2, ' ');
               refresh();

               napms(175);

               mvaddch(y1, x1, ' ');
               refresh();

               y2 = (row % getrandom(1, row)) + 1;
               x2 = (col % getrandom(1, col)) + 1;
               mvaddch(y2, x2, rand_char());
               refresh();

               napms(75);
       }
       endwin();
       return(0);
}