[as3][umap]地図の左上からのピクセル数を取得

package {
    public class MyMarker extends Marker {
        public function MyMarker(){}

        // get x,y from left top of map
        public function getXY():Point{
            var mapBounds :Bounds = core.getBoundsXY();
            var myBounds :Bounds = getBoundsXY();
            return new Point(myBounds.min.x-mapBounds.min.x,myBounds.min.y-mapBounds.min.y);
        }
    }
}