[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 While we are adding game design elements to the game, let’s go ahead and learn how to use a splashscreen ImageView Node object to implement a game background image plate. We will do this so that our white iBeagle, and (Cream) iCheese and iBullet objects, stand out to the game player better, using an enhanced blue background color. Adding a Background Image: Using .toBack( ) Method Before we get into coding the collision and scoring routines for the Enemy and Projectile objects, let’s add an Image asset (object) to use in the background plate, while we are in the process of adding objects to our game. Copy the skycloud.png 8-bit PNG8 image asset, seen in the bottom-left corner of Figure 17-24, from the book repository into the NetBeansProjects/InvinciBagel/src folder. After you do this, add a skyCloud Image object declaration to the end of the private Image object declarations for the splashscreen related image assets, as seen at the top of Figure 17-24. As you can see, there will be a warning highlight under this object until you implement (use) it in your Java code. Next, instantiate a skyCloud object in .loadImageAssets(), as seen at the bottom of Figure 17-24, using the following code: private Image splashScreen, instructionLayer, legalLayer, scoresLayer, skyCloud; skyCloud = new Image("/skycloud.png", 640, 400, true, false, true); Figure 17-24. Declare and instantiate a skyCloud Image object that references a skycloud.png background image asset Now you have a skyCloud object, so use a .setImage() method to set a SplashScreenBackground ImageView Node, to use this image asset inside the gameButton.setOnAction(ActionEvent) code block, so that when you click the PLAY GAME Button, this image is set as the backplate image. Also, make sure to use the .setVisible() method call with a value of true, so that the ImageView Node will be visible. The Java code, shown in Figure 17-25, should look like this: splashScreenBackground.setImage(skyCloud); splashScreenBackground.setVisible(true); www.it-ebooks.info 413
Chapter 17 ■ Enhancing Game Play: Creating a Scoring Engine, Adding Treasure and an Enemy Auto-Attack Engine Figure 17-25. Use a splashScreenBackplate.setImage() method call to install a skyCloud Image object in gameButton Since you have added this code to the gameButton’s event handling code, you must “counter” this move, by adding the same method call to the other three Button event handlers to set the image asset back to the splashscreen image asset, using the following Java code, shown in the other three Button event handling methods in Figure 17-25: splashScreenBackground.setImage(splashScreen); Use Run ➤ Project to test the code. As you can see on the left side of Figure 17-26, we have a z-index issue! 414 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 6 The Foundation of Game De
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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 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 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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Page 454 and 455: ■ index Background image (cont.)
Page 456 and 457: ■ index InvinciBagel animation (c
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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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