[JAVA][Beginning Java 8 Games Development]

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Chapter 7 ■ The Foundation of Game Play Loop: The JavaFX Pulse System and the Game Processing Architecture NetBeans will create a bootstrap infrastructure for the GamePlayLoop.java class, with a package and a class declaration, as illustrated in Figure 7-4. Now, you add an extends keyword and AnimationTimer. Figure 7-4. NetBeans creates a GamePlayLoop.java class and opens it in an editing tab in the IDE, for you to edit Mouse over the error, press Alt+Enter, and select Add import, as displayed in Figure 7-5. Figure 7-5. Subclass an AnimationTimer superclass with an extends keyword: press Alt+Enter, and select Add import www.it-ebooks.info 149
Chapter 7 ■ The Foundation of Game Play Loop: The JavaFX Pulse System and the Game Processing Architecture Once NetBeans adds the import javafx.animation.AnimationTimer; programming statement, you will be ready to start creating this class, which will harness the JavaFX pulse engine for you and contain all your core game play loop processing, or calls to classes and methods that will perform the various types of processing, such as sprite movement, sprite animation, collision detection, physics simulation, game logic, audio processing, AI, scoreboard updates, and the like. Creating the GamePlayLoop Class Structure: Implementing Your .handle( ) Method Note that once the import statement has been written for you by NetBeans, yet another wavy red error highlight appears below the GamePlayLoop class name. Mouse over this to find out what the error message is relating to this newest error. As Figure 7-6 demonstrates, the .handle() method required for every AnimationTimer subclass has not yet been implemented (also called overridden) in this GamePlayLoop.java class, so you have to do this next. Maybe you can even get NetBeans to write the code for you; let’s take a look, and see! Figure 7-6. Once you extend and import AnimationTimer, NetBeans throws an error: class does not implement the .handle() As you can see at the bottom left of the error message pop-up, you can use the Alt+Enter keystroke combination to bring up a helper dialog, which will offer you several solutions, including one that will actually write the unimplemented .handle() method for you. Select Implement all abstract methods, shown in Figure 7-7, highlighted in blue. Once you double-click this option, NetBeans will write this method structure for you: @Override public void handle (long now) { throw new UnsupportedOperationException("Not supported yet."); } 150 www.it-ebooks.info
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Contents at a Glance About the Auth
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Introduction The Java Programming L
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■ Introduction In Chapter 13 you
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Chapter 1 ■ Setting Up a Java 8 G
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Chapter 2 Setting Up Your Java 8 ID
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Chapter 2 ■ Setting Up Your Java
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Profiling Your Java 8 Game Applicat
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Chapter 3 ■ A Java 8 Primer: An I
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Chapter 4 ■ An Introduction to Ja
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Chapter 9 ■ Controlling Your Acti
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Chapter 10 Directing the Cast of Ac
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Chapter 10 ■ Directing the Cast o
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Chapter 11 ■ Moving Your Action F
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Chapter 12 Setting Boundaries for Y
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Chapter 12 ■ Setting Boundaries f
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Chapter 13 ■ Animating Your Actio
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Chapter 14 ■ Setting Up the Game
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Chapter 15 Implementing Game Audio
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Chapter 15 ■ Implementing Game Au
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Chapter 16 ■ Collision Detection:
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Chapter 17 Enhancing Game Play: Cre
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Chapter 17 ■ Enhancing Game Play:
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■ index Background image (cont.)
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■ index InvinciBagel animation (c
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■ index Modifier keywords access
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Beginning Java 8 Games Development
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This Java 8 Game Development book i
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■ Contents NetBeans 8.0 Is User I
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■ Contents ■■Chapter 5: An In
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■ Contents Creating a Hero Superc
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■ Contents Organizing the .update
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■ Contents Optimizing the Scene G
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About the Author Wallace Jackson ha
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Acknowledgments I would like to ack
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