[JAVA][Beginning Java 8 Games Development]

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Chapter 11 ■ Moving Your Action Figure in 2D: Controlling the X and Y Display Screen Coordinates By having your .addNodesToStackPane() method called after your .addGameActorNodes() method, you will guarantee that your game assets will always be at a lower Z-index than your Splashscreen assets. This means that the SplashScreenBackplate and the SplashScreenTextArea ImageView “plates” will always be at the top Z-index layers in the StackPane, and thus, when these are displayed (made visible), they will completely cover your game play. This is because the SplashScreenBackplate ImageView contains an opaque PNG24 image asset that is the same size as your Scene (and Stage) object. We will be seeing the result of this method order reorganization later on when we test the new InvinciBagel game application, and you will see that we have resolved this problem of the game actor(s) displaying on top of the Splashscreen. We accomplished this simply by changing the order that your programming code is executed in. This should also point out to you that the order that the Java programming code is executed in is almost as important as the Java programming logic itself! Creating and Managing Your Cast: .createCastingDirection() Now the time has come to implement the other class that we created in Chapter 10, the CastingDirector.java class, and its CastingDirector() constructor method. We will do this inside of another new custom method we will create called .createCastingDirection(). This method will contain the initial instantiation of a CastingDirector object named castDirector, which we will create by using the Java new keyword and the CastingDirector() constructor method, as well as adding the iBagel Actor object to the castDirector object, using the .addCurrentCast() method that we created in Chapter 10. The Java method structure, which is shown error-free in Figure 11-8, should look like the following: private void createCastingDirection() { castDirector = new CastingDirector(); castDirector.addCurrentCast(iBagel); } Figure 11-8. Create private void createCastingDirection() method with castDirector and .addCurrentCast() statements 238 www.it-ebooks.info
Chapter 11 ■ Moving Your Action Figure in 2D: Controlling the X and Y Display Screen Coordinates Now that we have put our Image assets into place, created our Actor object, added him to the Scene Graph, created a CastingDirector engine, and added our iBagel to the cast, we’re ready to deal with the Game Timing Engine. Create and Start Your GamePlayLoop: .createStartGameLoop I am going to jump ahead of the .createSceneGraphNodes() method, which is still our most complex method body and which I am saving for last, and create a new method called .createStartGameLoop(). Inside of this method we’re going to create, and then start, our GamePlayLoop object, which we created back in Chapter 7 using the GamePlayLoop.java class. This class extends the JavaFX AnimationTimer superclass to provide access to the JavaFX pulse timing engine for our game. Inside of the .createStartGameLoop() method we are going to use the Java new keyword to create a pulse engine for our game named gamePlayLoop using the GamePlayLoop() constructor method. After that, we are going to call the .start() method off of this gamePlayLoop object to start the pulse event timing engine. This call is done by using the following four lines of Java programming logic, which are also shown error-free in Figure 11-9: private void createStartGameLoop() { gamePlayLoop = new GamePlayLoop(); gamePlayLoop.start(); } Figure 11-9. Create a private void createStartGameLoop() method, and create and .start() the gamePlayLoop object As you can see at the bottom of Figure 11-9, I have collapsed the other method structures, and I have them in the same order in the code that they are called within the .start() method, for organization purposes. I start a game play loop last because I want to make sure I have done absolutely everything else that I need to do to set up the game environment first, before I start the JavaFX pulse engine firing and launch the game. As you can see, I’m using the Java method names, and my game code design, to keep me reminded about what I need to do every time that I add some new game actor, which now that our hero is in place, could be game props, projectiles, enemies, treasure, and so on. 239
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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 5 An Introduction to Game D
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Chapter 5 ■ An Introduction to Ga
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Chapter 6 The Foundation of Game De
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Chapter 6 ■ The Foundation of Gam
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Chapter 7 The Foundation of Game Pl
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Chapter 8 Creating Your Actor Engin
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Chapter 8 ■ Creating Your Actor E
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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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