[JAVA][Beginning Java 8 Games Development]

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Chapter 12 ■ Setting Boundaries for Your Action Figure in 2D: Using the Node Class LocalToParent Attribute After that we removed the other two static modifier keywords on the StackPane and HBox objects, and made all of the rest of the variables private, at least for now, to provide the greatest level of encapsulation for the InvinciBagel (primary) game class. Next, we reorganized the code in the Bagel.java class relating to the .update() method. We created specific methods for polling the keypressed values and setting the iX and iY properties for the object, which we called the .setXYLocation() method, as well as creating the .moveInvinciBagel() method for calling the .setTranslate() methods. Finally, we created a new .setBoundaries() method in the Bagel.java class, which is called after the .setXYLocation() method but before the .moveInvinciBagel() method that makes sure that our main character stays on the screen at all times. In the next chapter, we are going take a look at advanced concepts regarding animating the game sprite as it is moved around your screen using the List ArrayList object, so that we get more realistic sprite animation before we get into advanced topics such as digital audio, collision detection, and physics simulation. www.it-ebooks.info 271
Chapter 13 Animating Your Action Figure States: Setting the Image States Based on KeyEvent Processing Now that we have also organized your Java code into logical methods in the Bagel.java class, as well as making sure that all of our Java code is standards compliant in Chapters 11 and 12, it is time to get into some more complicated code structures that will animate our InvinciBagel character on the screen as the user moves the character. For instance, if the character is traveling due East or due West (using only left or right keypresses, to travel in a straight line), he should be running (alternating between the imageStates(1) and imageStates(2) List elements). If the up key is also pressed, he should be leaping up in the direction of the left or right keypress, and if the down key is pressed, he should be preparing to land in the direction of the left or right keypress. We will also need to implement the Actor class’s isFlipH property or attribute, so that the character is facing the right way based upon the direction he is traveling. Instead of using another image for that, we will use the JavaFX capability to “flip” or “mirror” any image around its central Y axis (isFlipH) or around its central X axis (isFlipV). Once a sprite animation state is combined with the movement code that you put into place in the previous chapter, you’ll be amazed at how realistic this character will become, and we are still using only nine sprite state images (under 84KB of total data footprint used for our new media assets so far). We will do all of this character animation during this chapter using only Java code, and using only the JavaFX AnimationTimer (GamePlayLoop) superclass. This way, we are optimizing the use of the JavaFX pulse engine for our game by accessing the pulse event timing engine using only the javafx.animation package’s class that uses the least amount of memory overhead. The AnimationTimer class is the most simple class, with no class variables, and only a .handle() method to implement, and yet it is also the most powerful, because it lets you write all of your own code. This approach allows us to write custom code to animate a character based on keys pressed and movement, rather than triggering predefined Timeline objects based on KeyFrames (and their KeyValues) along that Timeline. I am keeping it simple on the game engine side, and putting all of the complexity into our custom game play code. This will save us a lot of headaches later on, trying to “synchronize” keyframe-based and timeline-based linear animations, which puts us into a linear timeline-based paradigm, such as Flash uses. This 100% Java 8 coding approach is certainly more difficult, from a Java coding perspective, but gives us an order of magnitude more power, to achieve a seamless integration of event processing, screen movement, character animation, physics, and collision detection. Setting up a multitude of prebuilt JavaFX Animation subclasses would presumably allow the same results in the end, but the code would be less elegant, and probably much more difficult to build future versions of the game play on top of. All of our character state animation will be created using a .setImageState() method that will be called from inside of the .update() method, so, we will continue to be organized in the movement and animation of our character. www.it-ebooks.info 273
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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 6 The Foundation of Game De
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Chapter 6 ■ The Foundation of Gam
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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 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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