aproxdistance in acs

// ============================================================================
// [Dusk] AproxDistance: Doom's P_AproxDistance, converted to ACS.
// It's faster, but less accurate than distance().
function int AproxDistance (int t1, int t2) {
	int dx = abs (GetActorX (t1) - GetActorX (t2));
	int dy = abs (GetActorY (t1) - GetActorY (t2));

	if (dx < dy)
		return dy + (dx / 2);

	return dx + (dy / 2);
}