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At this point, you should have created a few games: Rock Rain, a simple 2D game running on the Windows and Xbox 360 platforms; Rock Rain Live, a network-enabled version; Rock Rain Zune, a Zune version; and XNA TPS, a simple 3D third-person shooter game. If you ve followed along, you should be familiar with game programming terms and have a basic knowledge of the XNA Framework. By following our instructions, you have experienced the real effort that goes into planning and coding complete 2D and 3D games. Along the way, we have stressed some important points regarding game development: Creating a game is more than just a good idea: Creating a game is a team effort, or, if you will, a multidisciplinary effort. In addition to a good idea and clean code, you need neat graphics, cool sound effects, effective testing, and more. You ll need to wear a few different hats if you want to do it all yourself. Use the framework; don t re-create the wheel: XNA is not a game engine, but it does provides basic classes for calculating collisions (such as Rectangle, BoundingBox, and BoundingSphere), for doing vector and matrix operations, and much more. Know where you stand: Are you just interested in creating casual games, or do you want to enter the game industry as a creator of sophisticated pieces of software You ll need to study and practice different things for each case.

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Listing 7-1 shows an excerpt from the Java EE deployment descriptor showing the configuration of the DelegatingFilterProxy filter. You should be aware that the equivalent FilterToBeanProxy class may instead be used, but the differences are insignificant.

Consider extending the Content Pipeline: Animating 3D models is far easier to do with modeling tools than in XNA. Don t let the Content Pipeline s lack of native support for animations hold you back! Also consider creating helper tools to position 3D objects in your scenes. You can save those configurations to a file, and then write Content Pipeline extensions to read them. Keep on coding: The bad news is that your first few games will probably be crap everyone starts out with some bad games. The fact is that creating games is something that you learn, exclusively, by creating games. The good news is that with XNA, you can create a new game every week. So what you are waiting for Write games, not engines: The best way to stay motivated is to see the actual results of your work. Create a simple game, and then improve and polish it until it s ready to be the new LIVE Community Game blockbuster! We recommend that you go back and have a quick look at each chapter s summary, so you can refresh your memory about the material presented, and note topics that you didn t understand well or want to revisit. And remember that you can find the most recent code for this book s examples, as well as any text and code errata at the Apress web site (http://www.apress.com). Just go to this book s details page, and click the appropriate link. When you re sure that you ve gotten everything you can from this book, you can proceed further.

Figure 2-7. Two nonoverlapping boxes According to the code sample, the two boxes will overlap only if both the x and y coordinates of rectangle 2 are within range (X to X + width, Y to Y + height) of rectangle 1. Looking at Figure 2-7, you see that the y coordinate for rectangle 2 is not greater than the y coordinate plus the height of rectangle 1. This means that your boxes might be colliding. But when checking the x coordinate of rectangle 2, you see that it s greater than the x coordinate plus the width of rectangle 1, which means that no collision is possible. Figure 2-8 illustrates a case in which you do have a collision. In this case, you can check that both x and y positions of rectangle 2 are within the range of rectangle 1. In the code sample, you also do the opposite test, checking if the x and y coordinates of rectangle 1 are within the range of rectangle 2. Because you re checking just one point, it s possible for rectangle 2 s top-left corner to be outside rectangle 1, but for the top-left corner of rectangle 1 to be inside rectangle 2.

<filter> <description>Acegi Request Filter</description> <filter-name>acegi-request-filter</filter-name> <filter-class> org.springframework.web.filter.DelegatingFilterProxy </filter-class> <init-param> <param-name>targetBeanName</param-name> <param-value>acegiRequestFilter</param-value> </init-param> </filter> <filter-mapping> <filter-name>acegi-request-filter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> The target bean name provided to the DelegatingFilterProxy indicates the name of the bean from the application context to be used (note that you cannot use beans configured for specific DispatcherServlet instances). In practice, this will be the name of the configured FilterChainProxy bean.