public static function localToGlobalRotation(displayObject:DisplayObject):Float
    {
        points[0].setTo(0, 0);
        points[1].setTo(1, 0);
        var pointA = displayObject.localToGlobal(points[0]);
        var pointB = displayObject.localToGlobal(points[1]);
        return Math.atan2( -(pointB.y - pointA.y), pointB.x - pointA.x);
    }