[JAVA][Beginning Java 8 Games Development]

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Chapter 17 ■ Enhancing Game Play: Creating a Scoring Engine, Adding Treasure and an Enemy Auto-Attack Engine Figure 17-32. Use a randomNum Random object inside of the .setTranslateY() method and use a period to call selector The next thing that you will want to do is to declare an integer variable named attackBoundary that will be referenced inside of your .nextInt() method call, so that you can change your Y axis (bottom of screen) boundary later on if you wish, in one easy-to-edit location at the top of the Enemy.java class. The Java statement should look like this: int attackBoundary = 300; Now we’re ready to finish writing the Java code that flips the iBeagle Enemy Actor (sprite) so he is facing the correct direction, and then we can test the code. It is important to write complex Java code in logical, digestible steps. In this way, you can test your code as you write it, making sure that each component of the programming logic works, before adding additional complexity. You will see this work process during this chapter, as we develop a robust autoattack algorithm inside of the Enemy.java class. This auto-attack code can be used for any of the Enemy objects that you create in the future; thus the code that you’re writing during this chapter will cover a plethora of bad guy attacks! It is important to note here that since takeSides is boolean and can only have two values – true or false, we’ll only need to implement a simple conditional if-else structure. This is because if our if(takeSides) condition equates to being true, then we know that the false value (else condition) logic structure will handle the takeSides=false scenario. Inside of both of these if{} and else{} attack logic processing structures, we’ll flip the sprite image around the Y axis, remembering to set the isFlipH variable for future use, set the sprite X location, to one side of the screen or the other, set the sprite Y location to a random height value on the screen and then set the takeSides boolean variable to the opposite of its current true or false data value. In this way, the iBeagle Enemy Actor object will alternate between the left and right sides of the screen. Later, we’ll use the .nextBoolean() method, from the Random class, to make the www.it-ebooks.info 421
Chapter 17 ■ Enhancing Game Play: Creating a Scoring Engine, Adding Treasure and an Enemy Auto-Attack Engine attack unpredictable. Remember that we are starting simple, and adding complexity as we develop this code. The Java code for the basic initiateAttack() method body is shown error-free in Figure 17-33, and should look like the following: private void initiateAttack() { if(takeSides) { spriteFrame.setScaleX(1); this.setIsFlipH(false); spriteFrame.setTranslateX(500); spriteFrame.setTranslateY(randomNum.nextInt(attackBoundary)); takeSides = false; } else { spriteFrame.setScaleX(-1); this.setIsFlipH(true); spriteFrame.setTranslateX(100); spriteFrame.setTranslateY(randomNum.nextInt(attackBoundary)); takeSides = true; } } Figure 17-33. Add the logic inside the if-else structure that flips the sprite and positions it on either side of the screen 422 www.it-ebooks.info
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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 5 An Introduction to Game D
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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 12 Setting Boundaries for Y
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Chapter 13 ■ Animating Your Actio
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Chapter 14 ■ Setting Up the Game
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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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Page 454 and 455: ■ index Background image (cont.)
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Page 460 and 461: Beginning Java 8 Games Development
Page 462 and 463: This Java 8 Game Development book i
Page 464 and 465: ■ Contents NetBeans 8.0 Is User I
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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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