Точка пересечения двух отрезков

[BBOY Ильич]

function getPointOfIntersection(p1:Point, p2:Point, p3:Point, p4:Point):Point
{
	var d:Number = (p1.x - p2.x) * (p4.y - p3.y) - (p1.y - p2.y) * (p4.x - p3.x);
	var da:Number = (p1.x - p3.x) * (p4.y - p3.y) - (p1.y - p3.y) * (p4.x - p3.x);
	var db:Number = (p1.x - p2.x) * (p1.y - p3.y) - (p1.y - p2.y) * (p1.x - p3.x);
 
	var ta:Number = da / d;
	var tb:Number = db / d;
 
	if (ta >= 0 && ta <= 1 && tb >= 0 && tb <= 1)
	{
		var dx:Number = p1.x + ta * (p2.x - p1.x);
		var dy:Number = p1.y + ta * (p2.y - p1.y);
 
		return new Point(dx, dy);
	}
 
	return null;
}