[JAVA][Beginning Java 8 Games Development]

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Chapter 13 ■ Animating Your Action Figure States: Setting the Image States Based on KeyEvent Processing Figure 13-17. Add if() statements at the bottom of the method for .iswKey() and issKey for Jump and Evade animation Now we have implemented imageStates(0), imageStates(1), imageStates(2), imageStates(4), imageStates(5), imageStates(6), and imageStates(8) in our game event handling and character animation processing. The other sprites are better suited for use with collision detection, so let’s save those for later chapters in the book. Last Minute Details: Setting the isFlipH Property Next, I want to add in two more lines of code for what I call “bookkeeping,” because we have installed isFlipH and isFlipV properties in our Actor superclass, so if we mirror sprites around the X or Y axis, we need to be sure to set these variables correctly, to reflect that (no pun intended) change to the Actor object, so that we can use this information in other areas of our game application programming logic. We will do this using the Java this keyword, to refer to the iBagel object that we are coding for in the Bagel.java class, and call the .setIsFlipH() method, using a false value if ScaleX property has been set to 1, or a true value if the ScaleX property has been set to a value of -1. It is important to 294 www.it-ebooks.info
Chapter 13 ■ Animating Your Action Figure States: Setting the Image States Based on KeyEvent Processing note that we don’t absolutely have to use the Java this keyword; I am using it for clarity of meaning, and so you could also simply utilize the method call without using dot notation, like this: setIsFlipH(false); if you like. The Java code for doing this simple bookkeeping addition can be seen highlighted in Figure 13-18, and looks like this: if(invinciBagel.isRight()) { spriteFrame.setScaleX(1); this.setIsFlipH(false); } if(invinciBagel.isLeft()) { spriteFrame.setScaleX(-1); this.setIsFlipH(true); } // nested conditional if() processing ommitted for brevity // nested conditional if() processing ommitted for brevity Figure 13-18. Be sure to set the isFlipH property for the Bagel object using .setIsFlipH() called off of the this (object) Next, let’s test all of the new sprite animation code to see if it does what we think that it logically should do! The code is complex, at least for the primary left and right arrow key character movement, but is quite well organized, and very logical, and I don’t see any problems with it from a logic standpoint, but testing it thoroughly using NetBeans is the only way to find out! Let’s do that next. To review the sprite image states, refer back to Chapter 8 (Figure 8-2). Testing the InvinciBagel Sprite Animation States: Run ➤ Project Now it is time to use the NetBeans Run ➤ Project work process and test the .setImageState() method, which now gets called after the .setXYLocation() and .setBoundaries() methods, but before the .moveInvinciBagel() method. So the logical progression as it sits now is check keypressed, set X and Y location based on that, check to make sure you have not gone past any boundaries, set the sprite animation (Image) state, and then position the sprite. As you can see in Figure 13-19, the InvinciBagel character now runs realistically across the screen when you use left or right arrow keys. www.it-ebooks.info 295
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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 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 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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