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[SWF(width=600, height=500, backgroundColor=0xFFFFFF, frameRate=30)]
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function seamlessTile(img:BitmapData, featherSize:Number = 5):BitmapData{
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var pnt:Point = new Point(0,0);
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var tile:BitmapData = new BitmapData(img.width, img.height, true, 0xFF000000);
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tile.copyPixels(img, img.rect, pnt, null, null, true);
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var flipped:BitmapData = new BitmapData(img.width, img.height, true, 0xFF000000);
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var m:Matrix = new Matrix();
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m.scale(-1, 1);
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m.translate(tile.width,0);
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flipped.draw(tile, m);
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var aChannel:BitmapData = new BitmapData(img.width, img.height, true, 0x00000000);
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var grad:Sprite = new Sprite();
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m.createGradientBox(img.width, img.height, 0, 0, 0);
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grad.graphics.beginGradientFill(GradientType.LINEAR, [0xFFFFFF, 0xFFFFFF], [1, 0], [0, (255 / img.width) * img.width / featherSize], m, SpreadMethod.PAD);
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grad.graphics.drawRect(0,0,img.width, img.height);
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aChannel.draw(grad);
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tile.copyPixels(flipped, flipped.rect, pnt, aChannel, pnt, true);
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m.identity();
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m.scale(1, -1);
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m.translate(0,tile.height);
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flipped.draw(tile, m)
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aChannel.fillRect(aChannel.rect, 0x00000000);
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m.createGradientBox(img.width, img.height, Math.PI / 2, 0, 0);
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grad.graphics.clear();
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grad.graphics.beginGradientFill(GradientType.LINEAR, [0xFFFFFF, 0xFFFFFF], [1, 0], [0, (255 / img.height) * img.height / featherSize], m, SpreadMethod.PAD);
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grad.graphics.drawRect(0,0,img.width, img.height);
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aChannel.draw(grad, grad.transform.matrix);
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tile.copyPixels(flipped, flipped.rect, pnt, aChannel, pnt, true);
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return tile;
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}
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// test out the function:
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var canvas:BitmapData = new BitmapData(600, 470, true, 0xFF000000);
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addChild(new Bitmap(canvas));
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var image:Loader = new Loader();
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image.load(new URLRequest("http://actionsnippet.com/imgs/paper.jpg"));
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image.contentLoaderInfo.addEventListener(Event.COMPLETE, onLoaded);
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var texture:BitmapData;
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function onLoaded(evt:Event):void {
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texture = Bitmap(image.content).bitmapData;
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addEventListener(Event.ENTER_FRAME, onLoop);
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image.removeEventListener(Event.COMPLETE, onLoaded);
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}
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function onLoop(evt:Event):void{
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var tile:BitmapData = seamlessTile(texture, Math.max(1,mouseX/30));
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var p:Point = new Point();
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for (var i:int = 0; i<8; i++){
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p.x = (i % 4) * tile.width;
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p.y = int(i / 4) * tile.height;
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canvas.copyPixels(tile, tile.rect, p);
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}
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}
