[JAVA][Beginning Java 8 Games Development]

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Chapter 17 ■ Enhancing Game Play: Creating a Scoring Engine, Adding Treasure and an Enemy Auto-Attack Engine Figure 17-26. Install the skyCloud background Image (left), and use a .toBack() method call to set proper z-index (right) Since we want to have our background image at the lowest (zero) z-index so it will be behind all of our game play assets, but also have all the splashscreen assets at the highest z-index, so that those image plates will cover (be in front of) all of our game play assets, we normally would have to implement yet another ImageView compositing plate, to be able to do this. However, there is a handy set of z-index related Node class methods that will allow us to use the SplashScreenBackplate ImageView object to hold both the game splashscreen and a game background image plate at the same time! This is one of the ImageView Node optimizations that I wanted to implement to keep our game Nodes at a minimum, to reduce memory and processing overhead. The code to place the ImageView behind our game assets will call the .toBack() method off of the SplashScreenBackplate ImageView Node object, which relocates that Node to the Back (Bottom layer) of the JavaFX Scene Graph Node Stack. This is the equivalent of setting this Node’s z-index to zero. The Java statement can be seen highlighted in light blue at the top of Figure 17-26, and the completed Java code for your gameButton.setOnAction((ActionEvent)->{} event handling structure should look like the following: gameButton.setOnAction((ActionEvent) -> { splashScreenBackplate.setImage(skyCloud); splashScreenBackplate.setVisible(true); splashScreenBackplate.toBack(); splashScreenTextArea.setVisible(false); }); As you probably realize by now, we’ll need to “counter” this move in the other three Button event handling structures. We will use the opposite of the .toBack() method call, which is of course the .toFront() method call. As you can see, we need to not only call the .toFront() method off of the splashScreenBackplate ImageView Node object, but also off of the splashScreenTextArea ImageView object, and the buttonContainer HBox object that is holding our UI Button controls. We will need to call this method off of all of these Splashscreen and UI objects so that all of these are brought back to the front of the JavaFX Scene Graph Node Stack. The Java code, shown in Figure 17-27, looks like this: helpButton.setOnAction((ActionEvent) -> { splashScreenBackplate.setImage(splashScreen); splashScreenBackplate.toFront(); splashScreenBackplate.setVisible(true); splashScreenTextArea.setVisible(true); splashScreenTextArea.setImage(instructionLayer); splashScreenTextArea.toFront(); buttonContainer.toFront(); }); www.it-ebooks.info 415
Chapter 17 ■ Enhancing Game Play: Creating a Scoring Engine, Adding Treasure and an Enemy Auto-Attack Engine Figure 17-27. Use a .toBack() method call in the gameButton code, and .toFront() method call in the other Button code Using Random Number Generators: java.util.Random The java.util package contains programming utilities that you can use for your Java 8 games development, as you may have guessed from the package name. One of the most important Java utilities for game programmers is the Random class, and its Random() constructor method. This class can be used to create Random Number Generator objects, which generate random number (or boolean) values for use inside your game programming logic. We will be using this class to generate both int (integer, for random screen locations) and boolean (for “guess where the Enemy is coming from next” functions) random values. These will make sure the game player cannot anticipate the game by recognizing patterns during the game play. The Java 8 Random class was scratch-coded specifically to generate random numbers using the Java Object master class. The class hierarchy for the Random class looks like the following: java.lang.Object > java.util.Random 416 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 5 An Introduction to Game D
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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 9 Controlling Your Action F
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Chapter 10 Directing the Cast of Ac
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Chapter 12 Setting Boundaries for Y
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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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Page 454 and 455: ■ index Background image (cont.)
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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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