[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 13-11. Change .isDown() sprite cel to imageStates(6) using the imageStates.get(6) method call to use correct cel Let’s make sure that the professionalism of our InvinciBagel sprite animation is improving with each section of this chapter, and use the Run ➤ Project work process and test all four arrow keys. Be sure and test the up and down keypresses with the left and right keypresses (left-up, left-down, right-up, and right-down) to really see what the Java code that you have put into place so far is capable of. We have a long way to go, but very impressive results already! Optimizing Run-Cycle Processing: Turning Off Processing for Fly and Land States The next thing that I want to do is also advanced conceptually, but uses far less code. As an optimization nut, what is concerning me is that the animator, framecounter, and runningspeed variables and the programming logic that uses them might be taking up memory when the player is using the up and down arrow keys, so I want to put a statement in the top of the conditional if() structure that leaves the .setScaleX() sprite mirroring code intact but turns off the rest of the processing logic if the up and down keys are being used. The Java code for excluding the run-cycle logic should be based on the up and down arrow key variables both showing as false, indicating the player is using the left or right keys only. This exclusion logic is seen in Figure 13-12, and looks like the following Java code (shown in bold) addition: if(invinciBagel.isRight()) { spriteFrame.setScaleX(1); if( !animator && ( !invinciBagel.isDown() && !invinciBagel.isUp() ) ) { spriteFrame.setImage(imageStates.get(1)); if(framecounter >= runningspeed) { animator=true; 286 www.it-ebooks.info
Chapter 13 ■ Animating Your Action Figure States: Setting the Image States Based on KeyEvent Processing } framecounter=0; } else { framecounter+=1; } } else if(animator) { spriteFrame.setImage(imageStates.get(2)); if(framecounter >= runningspeed) { animator=false; framecounter=0; } else { framecounter+=1; } } Figure 13-12. Add if() statement logic to exclude processing of nested if-else hierarchy if down or up keys being pressed The reason that I’m doing this is because when either the up or down key is being pressed, the jump (or fly) or preparing to land sprite cel image is showing. For this reason, optimization dictates that I need to turn off all of the “alternating between sprite cel 1 and sprite cel 2” processing code. I want to do this so that this constant processing is not going on in memory and in the thread (CPU) when the imageStates(1) and imageStates(2) are not even being used (displayed) inside of the spriteFrame ImageView “container.” To achieve this optimization objective, I added a new level of evaluation to the outside of the second nested if() loop. This is the level that contains all of the sprite cel changes (1 to 2 and back) using the animator, framecounter, and runningspeed variables and related processing. This new more complex evaluation statement guarantees that all of this run-cycle processing logic will not be executed if this the new condition is being met. What this new condition says specifically, is that if the animator variable is false AND the up AND down keys are both not being used (are false) then to process the rest of the logic, which switches between the two sprite image states (as well as waiting a certain number of pulse events before each switch). What this means is that if either of the up or down keys are being pressed (thus showing the fly or land sprite cel image state), none of the programming logic past that point will be processed at all, saving CPU processing cycles for the many other things that we are going to be adding into the game play that will need to use this “saved” processing overhead for other game play-related logic. www.it-ebooks.info 287
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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 5 ■ An Introduction to Ga
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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 7 The Foundation of Game Pl
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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 11 ■ Moving Your Action F
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Chapter 15 ■ Implementing Game Au
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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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