[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 17-40. Modify the Enemy() constructor method in the Enemy class to add an InvinciBagel object named iBagel Now that the Enemy class (object) can see into the InvinciBagel class (object), we’re ready to add projectiles. Creating a Projectile Infrastructure: Adding Projectile Variables To add projectile support to the Enemy class we will need to declare four new variables at the top of the class. These will include randomLocation, a new variable that we’ll use for both the Enemy character and the projectile he shoots; randomOffset, a new variable that will hold the vertical (Y) offset that allows us to fine-tune position the projectile so that it comes out of the bazooka barrel; and the bulletRange and bulletOffset allowing us to do X positioning. We will set the randomLocation variable equal to the randomNum.nextInt(attackBoundary) logic, which used to be inside of the .setTranslateY() method call, and add 5 to this variable, to create the randomOffset variable data value. The new <strong>Java</strong> structure for these methods is error-free, as shown in Figure 17-41, and should look like the following <strong>Java</strong> code: int spriteMoveR, spriteMoveL, destination; int randomLocation, randomOffset, bulletRange, bulletOffset; public void update() { if(callAttack) { if(attackCounter >= attackFrequency) { attackCounter=0; spriteMoveR = 700; spriteMoveL = -70; www.it-ebooks.info 431
Chapter 17 ■ Enhancing Game Play: Creating a Scoring Engine, Adding Treasure and an Enemy Auto-Attack Engine } randomLocation = randomNum.nextInt(attackBoundary); spriteFrame.setTranslateY(randomLocation); randomOffset = randomLocation + 5; callAttack = true; } else { attackCounter+=1; } } else { initiateAttack(); } Figure 17-41. Add randomLocation, randomOffset, bulletRange, and bulletOffset variables to control bullet placement Also notice, at the bottom of Figure 17-41, we’ve also added an if(shootBullet){shootProjectile();} conditional if structure to the bottom of the .update() method, as well as adding a boolean shootBullet = false; declaration at the top of the Enemy.java class. Before we code the .shootProjectile() method, let’s add the shootBullet flag settings to the .initiateAttack() method, as well as setting a bulletOffset X location for the bullet, in if(!onScreen). 432 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 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 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.)
Page 456 and 457: ■ index InvinciBagel animation (c
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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
Page 466 and 467: ■ Contents ■■Chapter 5: An In
Page 468 and 469: ■ Contents Creating a Hero Superc
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Page 472 and 473: ■ Contents Optimizing the Scene G
Page 474 and 475: About the Author Wallace Jackson ha
Page 476: Acknowledgments I would like to ack
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