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The great strength of the MVC framework is that the data is completely separate from the display. You can display the same data in many different ways, without changing or corrupting that underlying data. What you see on the stage is just a visual interpretation of data. The main game screen of Escape! displays a lot of data. Not only does it display the action in the game, but it shows the mini-map and the shield and fuel meters. All of this is displayed by the GameView. Remember that the job of a view class is to mindlessly read data from the model. The mini-map, the meters, and the game itself are just based on the model s data. As long as the GameView class has access to the GameModel, it can use that data to create the display. The only logic in the GameView is the logic it needs to create and manage these different displays. All of these displays are quite complex. It would be impractical to cram them into one big class. So Escape! distributes the work among a few different helper classes. Figure 7-21 shows which components of the GameView are handled by helper classes.

Figure 7-21. The GameView has helper view classes that display the GameModel s data in different ways. Because the helper classes are themselves views, they all need a reference to the GameModel. So when the GameView creates a helper class, it sends it a reference to the GameModel in the constructor arguments. var mapView:MapView = new MapView(_gameModel, _stage); Some of the helper views also need a reference to the stage so that they can work out their sizes and positions using the stage s stageHeight and stageWidth properties. If you browse through the GameView class in the source files, you ll notice that all the helper views are contained within a sprite called _dataDisplay. Keeping them all together in one sprite makes it easier to add and remove them from the display as a single unit. This is entirely optional.

Chunking binary or images in their raw form using the XMLHttpRequest object is rather complicated because the data that is read turns into gibberish. The XMLHttpRequest properties responseText and responseXML expect either text or XML, respectively. Any other data type is not possible. Of course there is an exception: Base64-encoding binary data that is encoded as text, and then retrieving the text by using the XMLHttpRequest object. Another solution is not to manage the binary data but to manage the reference of the binary data. In the case of the img tag, that means assigning the src attribute to where an image is located. Images are downloaded indirectly. To understand how this works, consider an application that uses XMLHttpRequest to retrieve a document containing a single line. The single line is a URL to an image file. Here is the implementation of the example program:

Now that all the necessary software including Visual Studio 2005 and Enterprise Library have been installed on your machine, it will help to download and compile the ACME Cosmetics Point-of-Sales Application source code to follow along with the samples in this book. The samples within the book will not always contain all the code necessary to make a particular component compile. Hence, without the source code, trying and testing the samples will be difficult.

Again, this is basic OOP and basic MVC. You can break down each visual component into a helper class so that you declutter the main GameView class. This keeps everything organized and more readable, because you won t need to hunt through reams and reams of code to find the section of code relating to the mini-map or fuel meter, for example. If you delegate tasks to helper classes logically and use consistent naming conventions, you ll make it easy to find the relevant sections of code. This structure is a good place to start for building views that need to display a lot of data, such as for a fantasy role-playing game. In a classic role-playing game, you might need a large number of view classes to display the game data, as well as an equally large number of game screens.

Note You can find the current source for the ACME Cosmetics Point-of-Sales Application on the Apress