gistfile1.txt

public static function localToLocal( containerFrom : DisplayObject, containerTo : DisplayObject, origin : Point = null ) : Point {
	var point : Point = origin ? origin : new Point( );
	point = containerFrom.localToGlobal( point );
	point = containerTo.globalToLocal( point );
	return point;
}

function getZoomScale( min , max , step = 0 , steps = 3 ) {
	var diff = max - min;
	if( step == 0 )
		return min;
	if( step == steps )
		return max;
	return diff / ( 2 * ( steps - step ) );
}