Flex Flash 求一点关于直线的对称点
/** * 求一点关于直线的对称点 * * @date 2012-08-25 * @author Lycoris **/public function symmetricalPoint(p:Point, start:Point, end:Point) : Point{var s:Point = new Point;try{var A:Number;var B:Number;var C:Number;A=end.y-start.y;B=start.x-end.x;C=(end.x-start.x) * start.y - (end.y-start.y) * start.x;var tmp:Number = A * A + B * B;s.x = (B*B*p.x - A*A*p.x - 2*A*B*p.y - 2*A*C) / tmp;s.y = (A*A*p.y - B*B*p.y - 2*A*B*p.x - 2*B*C) / tmp;}catch(e:Error){Alert.show(e.message);}return s;}