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To see how a game program can produce a display, you need to look inside one of the C# programs that XNA built. At the end of 1, Computers, Xboxes, C#, XNA, and You, you used XNA Game Studio 2.0 to create a game program. Now you are going to take a look at this program and discover how it works. The file that contains the game behavior is called, not surprisingly, Game1.cs. The name Game1 was generated automatically when the project was created; the .cs part is the file extension for C# programs. If you want to take a look inside this file, start up XNA Game Studio 2.0 and open the solution you created in 1 from the Solution Explorer. You can find the Solution Explorer, as shown in Figure 2-2, in the top right-hand corner of the XNA Game Studio 2.0 screen. If you double-click the name of the file that you want to work with, the file opens in the editing window. If you take a look at the content of Game1.cs, which drew that impressive blue screen, you can see how the program works. The program code that XNA Game Studio 2.0 created when you made an empty game contains the following method:

This solution would work as long as you know all the derived classes of the base class, but doing this would limit the reusability of the base class. In general, base classes shouldn t contain code that depends on the derived classes. Describing the Design Using the Unified Modeling Language The Unified Modeling Language (UML) is a graphical tool for describing object-oriented designs. Development tools such as UML allow developers to discuss designs using a common vocabulary. Such tools also decrease ambiguity in a specification. In previous chapters, the class designs have been specified by tables listing the properties and methods. In this and subsequent chapters, I ll use a UML class diagram to specify designs. The basic unit of the class diagram is the box, which represents the class:

2

protected override void Draw(GameTime gameTime) { graphics.GraphicsDevice.Clear(Color.CornflowerBlue); // TODO: Add your drawing code here base.Draw(gameTime); }

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500 users will be able to log in over a 5-minute period (interim and final requirement). All page response times will be under 6 seconds (goal). X X

The class element has two sections below the name, one to specify the properties and one to specify the methods:

Figure 2-2

The preceding diagram describes the abstract base class you ll implement, BankAccount. The italic title shows that BankAccount is an abstract class. The UML lists the properties and their default values, and it specifies public properties by preceding them with a plus sign. The lower section of the class element lists the public methods defined in the class. The UML also indicates the parameters for the methods and their return values. In UML, the in word indicates that the parameter is passed by value in Visual Basic. The UML also shows the derived classes with the inheritance relationship denoted by an arrow pointing toward the base class, usually placed above the derived class. The derived classes are assumed to inherit everything from the base class, so only the additions are shown in the derived class. Here s the complet e UML class diagram for this chapter:

A method is a named part of a program. In this case the method has the name Draw (you can ignore the protected override void part for now). All you need to know at the moment is that when XNA wants to draw the screen, it will use this method. You can change what gets drawn by altering the content of this method. At the moment you just get a blue screen; if you look at the second line of the preceding code, you can see where the blue screen comes from.

Tune application server for improved performance and scalability (objective). Ensure that all procedures, scripts, data, and results from tests used to validate interim or final requirements are archived sufficiently to repeat the test and results later, if needed (compliance).

XNA Game Studio 2.0 detects that you re renaming the file and offers to rename the class throughout all your files for you. To accept this useful offer, you simply click OK, and the Game1 class is now renamed BreadAndCheeseGame in your source files. This renaming process is a lot more subtle than you might think. The class is renamed in the BreadAndCheeseGame.cs file and also where it s used in the Program.cs file. The Great Programmer Speaks: Refactoring Is Good

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