Creating in Memory BitMaps from a single image file.

I found this today while looking up information on the new Flex 4 Layout classes. This guy has a single .png file with a bunch of cards on it that he wants to use as individual images in his application. I was pretty impressed with the code, mainly because I had never really thought about it and it's an easy solution.

protected function application1_creationCompleteHandler(event:FlexEvent):void
{
  loader = new Loader();
  loader.contentLoaderInfo.addEventListener( Event.COMPLETE, loaderComplete );
  loader.load( new URLRequest( "cards.png" ) );
}
    
/**
* Extract each card in the deck into their own object
* The object includes a label (rank of suit) and a Bitmap image of the card
*/
protected function loaderComplete( event:Event ):void
{
  var suitsIdx:Number = 0;
  var ranksIdx:Number = 0;
  var cardWidth:Number = 79;
  var cardHeight:Number = 123;
  var a:Array = [];
  var img:BitmapData;
        
  var d:BitmapData = Bitmap( loader.content ).bitmapData;

  for ( var i:int = 0; i < 52; i++ )
  {
     img = new BitmapData( cardWidth, cardHeight );
     img.copyPixels( d, new Rectangle( ranksIdx * cardWidth, suitsIdx * 
         cardHeight, cardWidth, cardHeight ), new Point( 0, 0 ) );
     img.draw( img, new Matrix() );
     a.push( new Bitmap( img ) );
            
     if ( i == 12 || i == 25 || i == 38 )
     {                    
          suitsIdx++;
          ranksIdx = 0;
     }
     else
     {
          ranksIdx++;
     }
  }
        
  list.dataProvider = new ArrayCollection(a);
  list.selectedIndex = 25;
}