http://actionscriptbible.com/ch27/ex3 in Java

Display UPC - 13 in Java http://actionscriptbible.com/ch27/ex3
http://actionscriptbible.com/ch27/ex3
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Getting at a Loader s Content
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package { import flash.display.*; import flash.events.*; import flash.net.URLRequest; import flash.system.LoaderContext; import flash.text.*; public class ch27ex3 extends Sprite { protected var bmpData:BitmapData; protected var swatch:Swatch; public function ch27ex3() { var l:Loader = new Loader(); //photo (CC-BY) Roger Braunstein //source http://www.flickr.com/photos/rogerimp/188712483/ var url:String = "http://actionscriptbible.com/files/pastels.jpg"; l.load(new URLRequest(url), new LoaderContext(true));
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Part VI: External Data
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EXAMPLE 27-3
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(continued)
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l.contentLoaderInfo.addEventListener(Event.COMPLETE, onComplete); l.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, onError); addChild(l); } protected function onComplete(event:Event):void { var loader:Loader = LoaderInfo(event.target).loader; if (loader.content is Bitmap) { bmpData = Bitmap(loader.content).bitmapData; swatch = new Swatch(); addChild(swatch); addEventListener(MouseEvent.MOUSE_MOVE, onMouseMove); } } protected function onError(event:ErrorEvent):void { trace(event.text); } protected function onMouseMove(event:MouseEvent):void { var mx:int = stage.mouseX, my:int = stage.mouseY; if (mx >= 0 && mx < bmpData.width && my >= 0 && my < bmpData.height) { swatch.x = mx; swatch.y = my; swatch.color = bmpData.getPixel(mx, my); event.updateAfterEvent(); } } } } import flash.display.Shape; class Swatch extends Shape { public function set color(c:uint):void { graphics.beginFill(c); graphics.lineStyle(0, 0xffffff, 1, true); graphics.drawRect(10, 10, 25, 15); graphics.endFill(); } }
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You ll learn more about BitmapData and the graphics property used to draw the swatch in Part VIII of this book. The important aspect of this example is that the Loader not only loads an image and adds it to the display list, but it provides access to the display object that Loader constructs from the le. Not only is the Loader displaying an image of brightly colored pastels, it s done so totally within the normal Flash Player API the loaded image is a Bitmap in the display list of the Loader.
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27: Networking Basics and Flash Player Security
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You might notice a second argument passed to load() that I didn t cover. This was required for the example to be able to access the data from the loaded image; you ll learn more about why in the section Understanding Flash Player Security later in this chapter. You can, like any other display object, remove the loaded content from its Loader and place it elsewhere in another display list. The Loader won t lose track of it; it will still be the content property of the Loader, and it will still disappear if you unload() the Loader.
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When unloading sounds and movies loaded using a Loader, you typically have to be very careful to remove all event listeners and null all references to the media to be a hundred percent certain that the media stops playing. Otherwise, you may notice that the media continues playing in the background despite your efforts. In Flash Player 10.1 and later, you can use the hammer of doom on your loaded media with Loader s unloadAndStop() method, which assures your media unloads properly despite normal garbage collection rules.
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Loading External SWFs
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Again, if all you want to do with a loaded SWF is put it on the stage, you can do it as succinctly as in Example 27-1; loading works the same no matter what image format you load. However, the ability to load SWFs at runtime provides some interesting opportunities to break out applications into multiple les or interface between several separate programs.
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Instantiating Classes from External SWFs
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Both code, and assets like graphics, sounds, videos, and fonts, are represented by classes in ActionScript 3.0. Recall from 16 that assets published in a SWF that are exported for ActionScript become classes that extend the appropriate type of asset, whether you publish them from Flash Professional or use Embed metadata tags with the Flex SDK compiler. Typically, you create a new instance of a class with the new operator, as in new Sprite(). But you can also use new with a variable of type Class, which stores a class reference. You can get a class reference by assigning it directly to a known class:
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var rectClass:Class = Rectangle; var rect:Rectangle = new rectClass(); trace(rect); //(x=0, y=0, w=0, h=0)
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You can also look up classes by their name, using the getDefinitionByName() function in the flash.utils package.
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var pointClass:Class = Class(getDefinitionByName("flash.geom.Point")); var point:Point = new pointClass(); trace(point); //(x=0, y=0)
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You have to cast the de nition to a Class because you can also use the getDefinitionByName() function to look up other public items like functions, values, and namespaces. When you have multiple SWFs loaded, the system must gure out how to partition the de nitions in the SWFs. Class uniqueness is only guaranteed for one SWF. The compiler can t, and shouldn t, try to ensure that no two SWFs ever have classes with the same name. So when you load in a new SWF,
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