SCRH
bzero(vid, SCRW*SCRH);
org_x = krandom() % SCRW; org_y = krandom() % SCRH;
if (x < 0 || y < 0 || SCRW <= x || SCRH <= y) {
bzero(vid, SCRW*SCRH);
for (j = 1, k = SCRW; j < SCRH; j++)
star[i] = krandom() % (SCRW*SCRH);
if (star[k] > SCRW*SCRH)
star[k] -= SCRW*SCRH;
bzero(vid, SCRW*SCRH);