[JAVA][Beginning Java 8 Games Development]

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Chapter 6 ■ The Foundation of Game Design: The JavaFX Scene Graph and the InvinciBagel Game Infrastructure Testing the InvinciBagel Application: Pulse the Scene Graph Click the green Play arrow at the top of the NetBeans IDE, and run the project. This will bring up the window illustrated in Figure 6-9 (I have removed the Java code added in Chapter 4, demonstrating how to create a windowless application). So, you have window “chrome” back, at least for now. As you can see, you are getting a very good result, using only a dozen import statements (external classes), a few dozen lines of Java code, and a half a dozen child nodes below the Scene Graph root (StackPane) object. As you can see, JavaFX does a great job of compositing the backplate, composite image overlays, and button bank overlay into one seamless, professional result! Figure 6-9. Run the InvinciBagel application, and make sure that the StackPane compositing class is working correctly Because you only copied and pasted the EventHandler routines for each button, and changed your Button objects’ names but not the code inside these routines, the Button objects will still work properly (writing text to the console) and not cause compiler errors. However, they will not do what you want them to do, which is to change an image overlay so that the panel on the left-hand side of the design holds a title and text that you want it to show a user. This will be done using a call to the .setImage() method, which will set the splashScreenTextArea ImageView object to the instructionLayer, scoresLayer, or legalLayer Image object, based on which Button UI control is clicked by the user. You cannot implement this event-handling code until you add the last two Image object instantiations! Finishing an InvinciBagel UI Screen Design: Add Images Let’s finish with the createSplashScreenNodes() method by adding two more lines at the end of the method that add two more Image objects, referencing the invincibagelcreds.png and invincibagelscores.png 32-bit PNG32 digital image assets. This is done by employing the following two lines of Java object instantiation code using the new keyword: legalLayer = new Image( "/invincibagelcreds.png", 640, 400, true, false, true ); scoresLayer = new Image( "/invincibagelscores.png", 640, 400, true, false, true ); www.it-ebooks.info 139
Chapter 6 ■ The Foundation of Game Design: The JavaFX Scene Graph and the InvinciBagel Game Infrastructure As Figure 6-10 shows, the code is error free, because you have copied the four PNG files into your project’s /src folder. You do not need the other lines of code (ImageView object instantiation, .setImage()), because you will be using the splashScreenTextArea ImageView object to hold these last two Image objects. Thus, you are saving on Scene Graph Node objects used, as you are using a single ImageView Scene Graph Node object to display three different Image objects (overlays), based on button events. Figure 6-10. Adding legalLayer and scoresLayer Image object instantiations to add the other image composite plates This means that the splashScreenTextArea.setImage() method calls you will make off the splashScreenTextArea ImageView object will be placed inside the ActionEvent EventHandler programming constructs for the three Button objects that trigger image composite overlays when they are clicked. The fourth Button object will start up game play, so, for now, you will just have a Java comment in that button event-handling structure, making it an “empty” logic structure. Now, let’s take a look at how to finish coding these EventHandler constructs so that you can finish this UI design and get on with creating the game play engines mentioned earlier. Interactivity: Wiring the InvinciBagel Buttons for Use You need to replace the system writing to the console code in all these duplicated button event-handling structures with calls to the .setImage() method so that you can set the image-compositing plate ImageView to the Image object that holds the digital image asset you want to overlay the InvinciBagel backplate artwork created by Pat Harrington. You have already written this code construct twice in the createSplashScreenNodes() method, so you can copy the line of code directly above the two Image object instantiations you just wrote, if you want a shortcut. The .setOnAction() event-handling Java code structures would therefore look like this: helpButton.setOnAction(new EventHandler() { @Override public void handle(ActionEvent event) { splashScreenTextArea.setImage(instructionLayer); } }); 140 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 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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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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