if (x == RECT_LEFT(*a)) dir = OB_DIRECTION_WEST;
if (x == RECT_RIGHT(*a)) dir = OB_DIRECTION_EAST;
if (y == RECT_TOP(*a)) dir = OB_DIRECTION_NORTH;
if (x == RECT_LEFT(*a)) dir = OB_DIRECTION_WEST;
if (x == RECT_RIGHT(*a)) dir = OB_DIRECTION_EAST;
if (y == RECT_TOP(*a)) dir = OB_DIRECTION_NORTH;