Panorama-2D(AS3.0)

This code(from http://lab.andre-michelle.com/) is used for displaying panoramic pictures;I just rewrited it into as3.0.
code:

package {
 import flash.display.*;
 import flash.events.*;
 import flash.geom.*;
 public class Panorama2D extends Sprite {

  var g:Sprite = new Sprite();
  var image:BitmapData = new source(0, 0);
  /*your panoramic picture - suppose to be W*(H=256)(class name "source")in the lib*/
  var output:BitmapData = new BitmapData(256, 256, true, 0);
  var bounds:Rectangle = output.rect;
  var origin:Point = new Point();
  var dx:Number = 0;
  var dy:Number = 0;
  var matrix:Matrix = new Matrix();
  public function Panorama2D():void {
   var container:Bitmap = new Bitmap(output);
   addChild(container);
   addEventListener(Event.ENTER_FRAME,onEnterFrame);
  }
  function onEnterFrame(event:Event):void {
   dx = dx + (128 - mouseX) / 8;
   matrix.tx=dx;

   g.graphics.beginBitmapFill(image, matrix, true);
   g.graphics.drawRect(0, 0, 256, 256);
   g.graphics.endFill();

   matrix.tx=0;
   matrix.ty=0;

   output.fillRect(bounds, 0);
   output.draw(g, matrix);

   g.graphics.clear();
  }

 }//end of class
}//end of package

Links:

PanoPaint: a 360 degree panorama painting tool designed to aid in creation of immersive concept art for game and film scenes.

http://www.resnlabs.com/entry/36/panopaint/index.html