Chapter 36 Example 5

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license : MIT License
modified : 2010-02-09 14:23:39

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package {
  import flash.display.*;
  import flash.geom.*;
  import flash.events.Event;
  import flash.net.URLRequest;
  import flash.system.ApplicationDomain;
  import flash.system.LoaderContext;
  public class ch36ex5 extends Sprite {
    public function ch36ex5() {
      var loader:Loader = new Loader();
      loader.load(
        new URLRequest("http://actionscriptbible.com/files/bitmaptiles.swf"),
        new LoaderContext(true));
      loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onLoad);
    }
    protected function onLoad(event:Event):void {
      //extract A and B bitmaps from library SWF
      var L:ApplicationDomain = LoaderInfo(event.target).applicationDomain;
      var tileA:BitmapData = new (Class(L.getDefinition("assets.TileA")))(0,0);
      var tileB:BitmapData = new (Class(L.getDefinition("assets.TileB")))(0,0);

var steps:int = 60;
      var size:Rectangle = tileA.rect;
      var wrapAt:Number = stage.stageWidth;
      var destination:Point = new Point(), origin:Point = new Point();
      var bmp:BitmapData = new BitmapData(stage.stageWidth, stage.stageHeight);
      var tempBmp:BitmapData = new BitmapData(size.width, size.height);
      for (var i:int = 0; i < steps; i++) {
        //clear temp bitmap
        tempBmp.fillRect(size, 0);
        //temp bitmap = A
        tempBmp.copyPixels(tileA, tileA.rect, origin);
        var blend:int = i / steps * 256;
        //blend temp (contains A) and B into temp
        tempBmp.merge(tileB, tileB.rect, origin, blend, blend, blend, blend);
        //copy temp (A-B blend) into next position in grid
        bmp.copyPixels(tempBmp, tempBmp.rect, destination);
        
        destination.x += size.width;
        if (destination.x + size.width > wrapAt) {
          destination.y += size.height;
          destination.x = 0;
        }
      }
      var bitmap:Bitmap = new Bitmap(bmp);
      addChild(bitmap);
    }
  }
}

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