components movements are executed, the collisions between them are considered, the gameending criteria are checked, the controller vibration is activated, the sound is played, and the screen is drawn The MicrosoftXnaFrameworkGame class provides two overridable methods that are called by the game loop: Update, where you must include the game calculations, and Draw, where you draw the game components Let s take a closer look at these methods, presented in the next code snippet, to highlight some relevant details: protected override void Update(GameTime gameTime) { // Allows the game to exit if (GamePadGetState(PlayerIndexOne)ButtonsBack == ButtonStatePressed) thisExit(); // TODO: Add your update logic here baseUpdate(gameTime); } protected override void Draw(GameTime gameTime) { graphicsGraphicsDeviceClear(ColorCornflowerBlue); // TODO: Add your drawing code here baseDraw(gameTime); } The first important point to discuss is the gameTime parameter received by both methods.

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The first page of the installation wizard, shown in Figure A-2, prompts you to select updates to existing features or to search for new features. To acquire the latest updates to an already-installed Spring IDE environment, you would select the first of these options. However, upon the initial installation you should select the Search for New Features to Install option and click the Next button.

This parameter is crucial to all the game logic, because the game must know how much time has passed since the last step of the game loop to do the correct calculations for example, to calculate the correct position for the game components according to their speeds in the game Let s take a closer look at the GameTime class properties: ElapsedGameTime: This property represents the amount of game time since the last time the game loop was called Dealing with game time means that the game loop is called a fixed number of times per second, so the game logic can use game time as a basic unit of time to perform calculations Creating games based on game time instead of real time is easier, because the game can define movements expressed in units per game update, simply incrementing the game components by the calculated rate in every update.

In the next wizard (not shown), click the New Remote Site button and then enter the details exactly as shown in Figure A-3.

When the IsFixedTimeStep property of the Game class is true, this class ensures that Update will be called the correct number of times per second, dropping frames in a game slowdown if necessary ElapsedRealTime: This property represents the amount of real time since the last time the game loop was called By setting the IsFixedTimeStep property of the Game class to false, the game loop will run at maximum speed, being called as many times as possible per second This could increase the code complexity, but also might allow for greater speed in the game..

The Name field in Figure A-3 is an arbitrary name that will be shown in subsequent pages of the installer, but the URL field is used to obtain the installation files and must be entered verbatim as After you click the OK button, the next page will show a list of the update sites known to the Eclipse update installer, with only the Spring IDE site selected (if any other entries are selected, deselect them). Click Finish, and the installer will check the Spring IDE site for the features that are available from it. After the installer has obtained the list of features, they will be shown in the Updates dialog box. If you expand the tree view of features to install, the dialog should look much like Figure A-4, but with the Integrations features selected. If the page presents any error messages, deselect the tools that cannot be installed.

To demonstrate the concepts discussed so far in this chapter, in this section, you ll create code to draw a line over each of the 3D axes, and the letters X, Y, and Z near these lines, so you can see for yourself the results of creating and manipulating a 3D scene. The steps for creating and rendering 3D objects in XNA can be summarized as follows:

At the time of this writing, the AspectJ Development Tools component (AJDT) is not compatible with the Europa release of Eclipse, and the Mylyn integration tool is unlikely to be of immediate interest, so I have disabled their installation as shown in Figure A-4. Click Next, and you will be prompted to accept the license agreement for the tools. After you have accepted this, the installation will proceed. The installation files are not signed, so you will need to click Install when a dialog warns you of this. Finally, select Yes when you are asked whether you would like to restart the Eclipse environment. The Spring IDE plugin is now installed.

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