Get the relative sides of two objects

gistfile1.as

function getSide(targetPosition:Point, currentPosition:Point, currentDirection:Point):int
{
  var positionDelta:Point = new Point(
		targetPosition.x - currentPosition.x,
		targetPosition.y - currentPosition.y
	);
	var direction:Number = positionDelta.x*-currentDirection.y + positionDelta.y*currentDirection.x;
	if (direction < 0.0)
		return 1;
	else if (direction > 0.0)
		return -1;
	else
		return 0;
}