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//Create a Rectangle object that's aligned to the correct spot on the //tile sheet. It's top-left position matches the top-left position on //the tile sheet based on the tile we need. These positions are //stored in the tile model objects var sourceRectangle:Rectangle = new Rectangle ( _tiles[j].tileSheet_X, _tiles[j].tileSheet_Y, _tileSize, _tileSize ); //Create a Point object that defines the new position of the //tile on on the stage bitmap. //This is tile's stage position var destinationPoint:Point = new Point(_tiles[j].x, _tiles[j].y); //Copy the tile from the original tile sheet and project it onto the //correct new place on the stage bitmap. //If your original tile bitmap uses any areas of transparency, make sure to add the last //"true" parameter. This is mergeAlpha. It lets transparent areas show through _stageBitmapData.copyPixels ( _tileBitmapData, sourceRectangle, destinationPoint, null, null, true ); } //Update the status box _statusBox.text = "BIT BLOCK TRANSFER:"; _statusBox.text += "\n" + "TILES ON STAGE: " + _tiles.length; } } } Let s take a close look at how this all works.

greater cost is the waiting time of the network communications. Therefore, to be robust, it is best if each local client waits individually and indicates to the controller when they have completed. While an individual thread is waiting, it is not consuming resources, and therefore having multiple waiting threads is not a problem for the server. Following is the implementation of the command execution: protected List _runningThreads = new LinkedList(); public abstract void addResult(Result result); public void processRequest( Request request) { Iterator iter = _commands.iterator(); _runningThreads.clear(); while( iter.hasNext()) { Command cmd = (Command)iter.next(); cmd.setRequest( request); cmd.assignParent( this); Thread thrd = new Thread((Runnable)cmd); _runningThreads.add( thrd); thrd.start(); } } public void processRequest( String impl, Request request) { Iterator iter = _commands.iterator(); _runningThreads.clear(); while( iter.hasNext()) { Command cmd = (Command)iter.next(); if( cmd.getIdentifier().compareTo( impl) == 0) { cmd.setRequest( request); cmd.assignParent( this); Thread thrd = new Thread( (Runnable)cmd); _runningThreads.add( thrd); thrd.start(); break; } } } The data member _runningThreads is a list of threads that are executing. The list is required by the synchronous or asynchronous controller implementations to know when a thread has completed. The method addResult, which is used to add a result to the controller, is defined as abstract because the synchronous or asynchronous implementations define their own way of managing the results. You will see this difference shortly. The processRequest methods are used to execute the Command interface instances. There are two versions of the processRequest method. The version with a single parameter executes all local clients. The version with two parameters executes a specific local client. Regardless of whether a single local client or all local clients are executed, they are executed on their own threads. This keeps the architecture simple so you don t have to deal with too many architectural variations.

The class embeds the tileSheetpng file and turns it into a BitmapData object [Embed(source="./assets/images/tileSheetpng")] private var TileSheet:Class; public function BitBlockTransfer():void { //Create a BitmapData of the tile sheet _tileSheetImage = new TileSheet(); _tileBitmapData = new BitmapData(_tileSheetImagewidth, _tileSheetImageheight, true, 0); _tileBitmapDatadraw(_tileSheetImage); It doesn t display the tile sheet on the stage The tile sheet just exists as BitmapData so that its pixel information can be read It s a storage container for your game object images The application class also creates a stage bitmap This bitmap is blank and fills the whole stage The tiles from the _tileBitmapData will be copied onto it With blitting, the game objects are not added to the stage They re projected onto a big bitmap that s the same size as the stage That s what the _stageBitmap is.

Many applications have common functionality that can be invoked from more than one component within an application. To simplify these tasks, the Composite UI Application Block provides commands that work hand and hand with UIElements. These commands provide a simplified interface to invoke UIElements. You can specify that one command event handler can be associated with more than one UIElement or vice versa. The use of the CommandHandlerAttribute attribute associates a command with a specific method. The WorkItem class contains a property called Commands. This property is a collection of commands that are registered and handled by the framework. The Command object contains an AddInvoker method that allows you to wire up an event to that specific command. Here is an example of creating a command: [CommandHandler("ShowError")] public void ShowName(object sender, EventArgs e) { MessageBox.Show("Sorry you are not allowed to do this."); } And here is how you could add an event to the preceding command: MyWorkItem.Commands["ShowName"].AddInvoker(item, "MouseOver");