create a thumbnail of an image in actionscript

Assume test1.jpg is the original file and test1_thumb.jpg is the thumbnail file to be created. The width or height of the thumbnail is of maximal size 100.

private function loadBMP():void
{
	loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onComplete);
	loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, onIOError);

    var request:URLRequest = new URLRequest(File.desktopDirectory.resolvePath("test1.jpg").url);
    loader.load(request);
}
private function onComplete(e:Event):void
{
	var thumbSize:int = 100;
	var ratio:Number = 1;
	if(loader.width >= loader.height)
	{
		ratio = thumbSize/loader.width;
	}
	else
	{
		ratio = thumbSize/loader.height;
	}
		
	this.bd = new BitmapData( loader.width*ratio, loader.height*ratio, false);
	var matrix:Matrix = new Matrix();
	matrix.scale(ratio, ratio);
	this.bd.draw( loader.content, matrix );
	
	var jpg:JPEGEncoder = new JPEGEncoder();
	var ba:ByteArray = jpg.encode(this.bd);
	var f:File = File.desktopDirectory.resolvePath("test1_thumb.jpg");
	var fs:FileStream = new FileStream();
	fs.open(f, FileMode.WRITE);
	fs.writeBytes(ba);
	fs.close();
}
private function onIOError(e:IOErrorEvent):void
{
	trace('error happened');
}

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