[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 The Java code for the .isRight() and .isLeft() conditional if() structures is going to become significantly more robust now, as we will have to nest another if-else conditional statement inside of the one that determines if the right arrow key is pressed. If right is true, it will set the ScaleX property to 1 (not mirrored), and then adds a conditional if() statement that looks to see if the value of the animator Boolean variable is false. If animator is false we use the handy method chain to get imageStates(1), and set this Image asset as the cel that the spriteFrame ImageView will use. After that, we need to set the animator variable to a true value, so that later on the imageStates(2) full run sprite image can be set. If animator is true, the else-if portion of the structure then looks to confirm animator is true, and if it is, again uses the spriteFrame.setImage(imageStates.get(2)); method chain to get imageStates(2) and sets animator to false. The new code for the statement, which is also shown in Figure 13-6, should look like the following: if(invinciBagel.isRight()) { spriteFrame.setScaleX(1); if(!animator) { spriteFrame.setImage(imageStates.get(1)); animator=true; } else if(animator) { spriteFrame.setImage(imageStates.get(2)); animator=false; } } It is important to note that you could remove the else if(animator) in this situation, and just use an else without the if(animator) part. However, we’re going to be making the right (and left) KeyPressed construct even more complex, by nesting even more code even deeper in the if-else-if-else structure, so I am going to leave it this way both for readability as well as for future code development purposes. As you can see in Figure 13-6, the code is error-free. You can now implement the same exact code structure into your .isLeft() conditional if() structure. Since the player will be using either the left or the right key (but not both together, at least not until we start adding those cool hidden “Easter egg” features during later stages of the game development) we can use the same animator variable in both the .isRight() and .isLeft() conditional if() constructs, allowing us to do a bit of memory-use optimization here. As you can see, the only difference is that the ScaleX property is set to mirror the sprite image (using a -1 value), and the Java code for the if(invinciBagel.isLeft()) conditional if() structure should therefore look like the following: if(invinciBagel.isLeft()) { spriteFrame.setScaleX(-1); if(!animator) { spriteFrame.setImage(imageStates.get(1)); animator=true; } else if(animator) { spriteFrame.setImage(imageStates.get(2)); animator=false; } } As you can see in Figure 13-7, this Java code is error-free, and you are ready to use your Run > Project work process, and test the InvinciBagel run cycle so you can see just how fast your superhero can run (or how fast the pulse engine in JavaFX can be, using the AnimationTimer superclass for your GamePlayLoop class). When you test your Java code, you will see that your superhero character is running much faster than humanly possible (and much faster than a bagel can run); in fact, the sprite animation cels are alternating so fast, that it looks like one blurred run animation! 280 www.it-ebooks.info
Chapter 13 ■ Animating Your Action Figure States: Setting the Image States Based on KeyEvent Processing Figure 13-7. Duplicate the nested if-else statement in .isLeft() structure, so InvinciBagel character runs both directions The next thing that we’ll need to is to add some Java code to control the running speed of your InvinciBagel sprite. We will do this using two Integer variables: one to serve as a framecounter and the other to hold the running speed value, which we can change later on based on our vX (velocity along the X axis) variable to get a realistic match between the speed the run cycle is animating at and the speed the sprite is being moved across the screen. Controlling Run Cycle Speed: Setting Up Your Animation Throttle Program Logic In order to be able to “throttle” our run cycle sprite animation to achieve different speeds, we need to introduce a “counter” variable called framecounter, which will count up to a certain number of frames before we change a false (sprite cel 1) animator value to true (sprite cel 2). We will also use a runningspeed variable, so that our animation speed is not hard-coded, and exists in a variable that we can change later on. This allows us to have fine-tuned control over the speed (realism) of this run-cycle animation. Declare these two Integer (int) variables at the top of the Bagel. java class and initialize the framecounter variable to zero and set the runningspeed variable to a value of 6. Since both the false (!animator) and true (animator) second-level if() structures will use this “count up to 6” variable, the math for what we are doing would equate to 6+6=12, divided into the 60FPS pulse timing loop, means that we are slowing down the unthrottled animation by 500% (five times, because 60/12=5). The variable declaration statements at the top of the Bagel class should look like the following Java code, and are also shown in the middle of Figure 13-8: int framecounter = 0; int runningspeed = 6; 281
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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 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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