[JAVA][Beginning Java 8 Games Development]

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Chapter 9 ■ Controlling Your Action Figure: Implementing Java Event Handlers and Using Lambda Expressions Figure 9-14. Add the case statements for ASDW keys to give users two key options, or to allow two-handed game play This is in keeping with our objective of optimizing both memory and CPU cycles, so that these are available for the more advanced parts of our game play, such as the game play logic, collision detection, or physics calculation. We also added constants that will allow us to later scale this 640 by 400 game prototype to fit display screens of different resolutions such as Pseudo HD (1280 by 720), True HD (1920 by 1080), and UHD (4096 by 2160). These can also be used in the game logic, to calculate the size of the screen area to determine movement boundaries. So far, we have added our actor and supporting cast engine, as well as our basic event handling processing, so that we can start to determine how this InvinciBagel game hero is going to move around on the screen in the next chapter. We have .handle() as well as .update() and .collide() methods in place to hold the code, which will animate a character, and eventually enemies, in both the single-player as well as a future multi-player version of this game. Next, let’s revisit our overview diagram of this game design, and take a look at the InvinciBagel package, the InvinciBagel.java class, and the GamePlayLoop and Actor and Hero classes, which provide the foundation for our game play processing and actor (and projectiles, treasure, enemy and obstacles or “props”) creation. Updating Our Game Design: Adding Event Handling Let’s update the diagram that I introduced in Chapter 7 (Figure 7-19) and updated in Chapter 8 (Figure 8-17) to include the ActionEvent and KeyEvent handling by the EventHandler class. As you can see in Figure 9-15, I added the EventHandler event handling class to the diagram as well as the ActionEvent objects that handle our UI design control and the KeyEvent that we are going to use to move the InvinciBagel actor around the screen. Since the .setOnKeyPressed() and .setOnKeyReleased() methods are called off of the scene Scene object named scene, and the ActionEvent is also contained under the Scene object, I placed these inside of the Scene object in the diagram. www.it-ebooks.info 205
Chapter 9 ■ Controlling Your Action Figure: Implementing Java Event Handlers and Using Lambda Expressions Figure 9-15. The current InvinciBagel package class (object) hierarchy, now that we have added Actor and Hero classes The Boolean flags set by the KeyEvent switch-case statements will be used in the .update() method and will move the InvinciBagel. The .handle() method in the GamePlayLoop object will call the .update() method, so there is a connection there as well. We are still making steady progress on our game engine framework, adding event handling! Summary In this ninth chapter, we added constants to our game Scene object creation so that we can change the supported display resolution at any time in the future, as well as adding a Color.WHITE background color using one of the other overloaded Scene() constructor methods. We did this so that we could finish our UI design and implement the PLAY GAME UI Button control so that it would hide the two ImageView image compositing plates that currently hold splash screen assets, and which can later hold game background digital image assets. We learned about the ImageView class (and object) visible characteristic (or attribute, or variable), and how to use the .setVisible() method call to toggle the visibility of a given ImageView image plate using true or false values. Since we turned the ImageView image compositing plate’s visibility off in the ActionEvent handling structure for the PLAY GAME Button, we then of course had to make sure that the visible attribute was set back to true (on or visible) for the other three Button UI controls in case your game player wanted to review any of these screens at a later time. Next we covered how to turn Java 7 compatible anonymous inner class event handling structures into a Java 8 lambda expression using NetBeans. I wanted to cover Java 8 lambda expressions in this book, even though they are an advanced feature, because they are one of the major new features in Java 8, and this is a Java 8 programming title. Finally we got into adding new features to our Java 8 game programming infrastructure, and learned about input event (InputEvent) classes and subclasses and about how the event handler (EventHandler) class structures are set up, and how they span across the java.lang, java.util, javafx.event and javafx.scene.input packages. We took a look at KeyCode constants and at the KeyEvent class, and then implemented this KeyEvent handing in our Java game code, using .setOnKeyPressed() and .setOnKeyReleased() event handler structures for both Java 7 and Java 8 compatibility. In the next chapter, we are going to take a look at how to move a game sprite around your screen using this KeyEvent event handling structure that we have created during this chapter, as well as how to ascertain the boundary (edges) of the screen, character direction, movement velocity, and related animation and movement considerations. 206 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 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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