st->eraser = erase_window (st->dpy, st->window, st->eraser);
st->color = st->colors [random () % st->color_count].pixel;
st->x = random () % st->width;
st->eraser = erase_window (st->dpy, st->window, st->eraser);
st->color = st->colors [random () % st->color_count].pixel;
st->x = random () % st->width;