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case 2: Exit(); break; } } } Notice that the TwoPlayers attribute, from the ActionScene class, which indicates if the two-player mode is active, is not used anymore, because the game does not support this feature. Your last changes are to the ActionScene class, which is actually the place where the game happens. Your work here will be just to remove the instances of objects that are not needed and adjust the frames of the sprites in accordance with the new textures. Let s go! First, remove the declaration and references to the rumblePad, player2, scorePlayer2, and twoPlayers attributes. They are no longer needed, since you have only one player and do not have vibration support for the Zune. Also, remove the TwoPlayers property, which is no longer necessary. Then, using the refactoring tool in Visual Studio, rename the player1 attribute to player and scorePlayer1 attribute to score, so that the code will be more readable. Next, change the frames of the sprites to fit to the new texture, as follows: protected Rectangle pauseRect = new Rectangle(84, 65, 99, 30); protected Rectangle gameoverRect = new Rectangle(53, 108, 186, 30);

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The data access layer is our interface with underlying data stores. The timesheet application limits these underlying components to a single database and a single mail server. This is not an unrealistic example (many real applications have exactly this structure) but there are numerous other mechanisms that could be used, such as data-queuing systems and event-logging systems. The DAO provides an abstraction of the underlying data source. In principle, an implementation based around a relational database can be replaced with a flat-file based implementation (or vice versa) without any impact on the functionality of the rest of the application. More realistically, a specific database could be substituted with minimal impact to the rest of the design.

Note Don t worry about the coordinates changes here. You can see these coordinates using you preferred

The benefits around a possible substitution of implementation can be overstated; swapping out a database isn t that frequent an occurrence. The real benefit of introducing the DAO layer is the way that it constrains certain types of complexity (database operations) to small classes. This makes debugging much simpler, and this is the advantage of the layered approach in general. A bug can be readily tracked to the layer it originates in (often its characteristics will be such that it is easy to infer its origin), and the limited complexity of the layer then makes analysis of the bug much simpler.

After that, the class constructor should look like this: /// <summary> /// Default constructor /// </summary> /// <param name="game">The main game object</param> /// <param name="theTexture">Texture with the sprite elements</param> /// <param name="backgroundTexture">Texture for the background</param> /// <param name="font">Font used in the score</param> public ActionScene(Game game, Texture2D theTexture, Texture2D backgroundTexture, SpriteFont font) : base(game) { // Get the current audio component and play the background music audio = (AudioLibrary)Game.Services.GetService(typeof(AudioLibrary)); background = new ImageComponent(game, backgroundTexture, ImageComponent.DrawMode.Stretch); Components.Add(background);

The two architectural components shown in Figure 2-1 are the database and the mail server. These are applications in their own right, standing outside your Spring application implementation. I have assumed that the mail server is available to you already. If you can send and receive e-mail, you already have access to one, and I think that is a reasonable assumption for readers of this book. The database is another matter. You may have no database readily available or you may have several. Installing a database (let alone administrating one) can be a complex task in itself, and I have therefore decided to use the HSQL (previously known as Hypersonic) embedded database. This can be used in several modes: Stand-alone as a network-accessible database manager Embedded as an in-memory database Embedded as a flat-file based database The full documentation for the HSQL database can be obtained from the website at http://hsqldb.sourceforge.net. I use the database in only the two embedded modes: in-memory for the benefit of unit tests (so that the database can be repeatedly created and destroyed without affecting subsequent tests) and as a flat-file based database for running the example application. Because I am using the database in embedded mode, I only need to obtain the library files in order to configure the database, and I do this by pulling it in as a Maven dependency (see the Maven section later in this chapter) so you don t need to explicitly download anything! If you want to use another database that s already available to you when running the example application, this is discussed in detail in 4.