[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 13-8. Add int variables at top of the class for framecounter and runningspeed and set to zero in no movement if As you can see in Figure 13-8, I’ve clicked on the framecounter variable, so it is highlighted, and you can see its use in an initialization statement that we’ll need to put into the “no arrow keys pressed” conditional if() structure, just as we did with the animator variable. The code for this if() structure is shown in Figure 13-8, and looks like this: if( !invinciBagel.isRight() && !invinciBagel.isLeft() && !invinciBagel.isDown() && !invinciBagel.isUp() ) { spriteFrame.setImage(imageStates.get(0)); animator=false; framecounter=0; } Just like we want the animator Boolean variable to be reset to the false value any time that all of the arrow keys are not in use, so to do we want the framecounter integer variable to be reset to a zero value, any time that the arrow keys are not in use (that is, are in a released state all at the same time). As you can see, we not only are setting our sprite’s waiting image state in this conditional statement, we are also using it to reset our other variables as well. Now we are ready to make our .isRight() and .isLeft() conditional if structures even more complicated, as we will be nesting our Java logic three-nested conditional if structures deep, to allow us to incorporate the framecounter and runningspeed integer variables into our conditional if() structure. This will make our animation code “wait” for six pulse event cycles before it changes the animator false value to true, and then wait for another six pulse event cycles before changing it back to false. This is fairly complicated Java code, at least for a beginner Java 8 title, but game programming is inherently a complex undertaking, so let’s go ahead and learn how to code this throttle mechanism for our run-cycle animation. I want to teach you about advanced topics during this book, and this one (implementing a speed throttle) is one that we simply can’t avoid, as this run speed using a simple Boolean alternating image state logic structure is not feasible to use in our game, given the incredible speed of the JavaFX pulse event timing engine and its “console game” 60FPS frame rate, which is making our InvinciBagel sprite run cycle look not only unrealistic, but painful to look at! 282 www.it-ebooks.info
Chapter 13 ■ Animating Your Action Figure States: Setting the Image States Based on KeyEvent Processing That said, this is about as complex as our Java 8 coding is going to get during this chapter, at least, so hang on tight, and enjoy the ride (or rather, the run) as we create a 16 lines of Java code, nested conditional if() structure, in the next section. It will be a lot of work, but the resulting run-cycle throttle control will be well worth the effort! Coding Your Run Cycle Throttle: Triple Nested If-Else Structures The modification we are going to make to our Boolean animator if() structure is to place an if(framecounter >= runningspeed){...} structure “around” the animator=true; statement, so that the animator does not become true until six pulse event loops have transpired. If the framecounter is equal to (or for some reason, greater than) six, animator becomes true, and the framecounter gets reset to zero and imageStates(2) is used. If framecounter is less than six, the else part of the statement increments the framecounter by one with a framecounter+=1; statement. We wrap framecounter code around both the if(animator) code in both parts of this structure, as shown in Figure 13-9: if(invinciBagel.isRight()) { spriteFrame.setScaleX(1); if(!animator) { spriteFrame.setImage(imageStates.get(1)); if(framecounter >= runningspeed) { animator=true; framecounter=0; } else { framecounter+=1; } } else if(animator) { spriteFrame.setImage(imageStates.get(2)); if(framecounter >= runningspeed) { animator=false; framecounter=0; } else { framecounter+=1; } } } www.it-ebooks.info 283
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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 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 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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