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As we ve said, if you really want to learn XNA, create a game on your own. Of course you can and are encouraged to write original games, but as a start, we recommend a simple but fairly interesting game: Tetris. If you start from the ground up and create your own version of Tetris, you ll exercise many concepts you ll use in every one of your future games. For example, the game calls for a set of classes with different behaviors (each block turns in a different way), but share a common ground (every block falls), so you ll create a hierarchy with a base and derived classes. You ll also need to detect collisions and control the game state, checking for full lines when the blocks fall; deal with user input; code for game end and game scoring; and so on. An XNA Tetris clone is also a good place to start because you can create it within a couple weeks, so you can stay motivated for your next challenge. This project will give you more insight about the difficulty of creating a game from the ground up. You will understand the complexity of building a game and how each of the game components fits together. And don t forget the roles of a game team we talked about in 1 even in a simple project like this, you should not limit yourself to just one role! After creating your Tetris clone, as your next step, consider a game that uses the same concepts, but includes some extra challenges. A good exercise is creating a Breakout clone or a pinball game. For this type of game, you use the concepts from Tetris, plus sound, some advanced collision-detection algorithms, and some animated sprites.

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package com.apress.coupling; import java.util.SortedSet; import java.util.TreeSet;

Tip You can find a simple Breakout clone at Alexandre Lob o s site (http://www.alexandrelobao.com/ Jogos/Alexandre Lobao-Palestras Jogos.asp), coded with less than 100 lines, which surely is a good starting point to create something new. For example, you might include bonus bricks or extra levels, to better understand and explore XNA s basic features. And if you think that 100 lines are too few for a game, think again: The Brazilian version of the Xbox 360 magazine published a simpler version for this game, with around 40 lines! That s what XNA is about!

public class Mailinglist { private SortedSet<String> addresses = new TreeSet<String>(); private Transport transport = new SmtpImpl(); public void addAddress(final String address) { addresses.add(address); } public void send() { for( final String address : addresses) { transport.send(address); } } } In Listing 3-3, our implementation contains a dependency on a specific Transport and a dependency on a specific SortedSet. It would be reasonable to assume that both of these dependencies should be provided via injection. In practice, however, I would be inclined to inject only the Transport implementation. The Transport implementation is a good candidate because of the following: It is likely to be a part of our own code base and thus itself a candidate for unit tests. It is reasonable to foresee a circumstance in which we would want to use an alternative message transport. It is likely that the implementation itself has a substantial set of dependencies on other classes. It is likely that the SmtpImpl implementation requires additional infrastructure to support it. In my view, the SortedSet implementation is not a good candidate for several reasons: TreeSet is a part of the standard class library available in the JDK, and thus unlikely to be a candidate for unit tests. We are unlikely to use an alternative implementation of SortedSet unless we are involved in minute performance-related debugging concerns. TreeSet will have no dependencies beyond the JDK itself. The JDK is generally assumed to be correct unless proven otherwise and does not require its own unit tests.

If you are interested in 3D games, consider creating a 3D version of Tetris, Breakout, or a pinball game. Such games are good learning tools because, although they use 3D objects, you can still use simplified, 2D-like versions of the collision-detection algorithm. After you break the ice with such simple 3D games, it will be time to try something harder. Consider creating a simple flight simulator, where you control the plane flying around buildings and maybe shooting at some of them!