[etc]

public function myDraw():void {
	myBitMapData.dispose();
	myBitMapData = new BitmapData(stage.stageWidth,stage.stageHeight);
	my_matrix.tx = -X;
	my_matrix.ty = -Y;
	my_matrix.scale(kf,kf);			
	myBitMapData.draw(my_mc0,my_matrix);
	if (!myBitMap) {
		myBitMap = new Bitmap();
		my_mc1.addChild(myBitMap);
	}
	myBitMap.bitmapData = myBitMapData;
}