repeat (no)
{
    draw_set_color(c_white);
    ossafe_fill_rectangle(targetx + random(w), targety + random(h), targetx + random(w), targety + random(h));
    draw_set_color(c_black);
    ossafe_fill_rectangle(targetx + random(w), targety + random(h), targetx + random(w), targety + random(h));
}