[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 Adding Bullets to a Clip: Updating .addCurrentCast( ) Since we are going to add single (one at a time, not unmarried) Actor objects back into the CURRENT_CAST List, we will need to modify the .addCurrentCast() method as it currently only takes an Actor . . . series of objects and we need it to accommodate a single added Actor object, like the addToRemovedActors() method does currently. You can see the .addToRemovedActors() method at the bottom of Figure 17-47. The .addCurrentCast() method was designed to be used statically in the InvinciBagel.java class, in the start() method, to add all of the cast members at one time (remember static versus dynamic). Now I am going to show you how to redesign it to allow “one off” additions during gameplay, which is a dynamic use of the method, as the List will be modified dynamically in real-time during gameplay. To upgrade the .addCurrentCast() method, simply “wrap” the .addAll() method call inside of the method with an if(actors.length > 1) if-else structure, with the original code inside of the if() portion and a CURRENT_CAST. add(actors[0]); statement inside of the else portion to accommodate single Actor method calls. The Java code for the new method structure can be seen in Figure 17-47, and should look like the following: public void addCurrentCast(Actor... actors) { if(actors.length > 1) { CURRENT_CAST.addAll(Arrays.asList(actors)); } else { CURRENT_CAST.add(actors[0]); } } Figure 17-47. Upgrade addCurrentCast() method in the CastingDirector class to accept a single object in parameter list www.it-ebooks.info 439
Chapter 17 ■ Enhancing Game Play: Creating a Scoring Engine, Adding Treasure and an Enemy Auto-Attack Engine It is important to note that we could also accomplish this objective by overloading this .addCurrentCast() method as well. If you wanted to do this in this fashion, the Java code would look like the following method bodies: public void addCurrentCast(Actor... actors) { CURRENT_CAST.addAll(Arrays.asList(actors)); } public void addCurrentCast(Actor actor) { CURRENT_CAST.add(actor); } Once your game design becomes more advanced and you have decorative Actor objects on the Stage, you can implement the COLLIDE_CHECKLIST in your if() structures that need to iterate through (only) the Actor objects in your Scene that need to be processed for collision. At this point in our game design, we are processing all of the Actor objects for collision, thus, we don’t yet need to implement the COLLIDE_CHECKLIST List Array. I’ve included it in the class design to be thorough and because I design foundational classes for games by looking out into the future toward what I will need in order for me to create an advanced (complete) game engine. That said, we may not have enough pages in this Beginner title to get that advanced, but the functionality is there if you needed to use it in your games, and after this chapter you will have plenty of experience using if() structures! Now that we can add cast members on an individual basis, it is time to write the methods that will allow us to check the CURRENT_CAST List Array to make sure that there are iBullet, iCheese, and iBeagle Actor objects in place for us to use for the next iteration of the auto-attack engine. What these methods will do is to look for these Actor objects in the CURRENT_CAST List, and if they are not present, will add one of them to the List so that it is ready for any type of attack that our conditional if() statements and random number generator create together! We’ll write three methods, one for deadly projectiles, called .loadBullet(); one for healthy projectiles, called .loadCheese(); and one for Enemy objects, called loadEnemy(). This will give us the ultimate flexibility, later on in our game development, of calling each type of functional Actor object type in its own “replenishment function.” Each method will look through the entire CURRENT_CAST List, using a for() loop, along with a .size() method call. In this way, the entire List is processed, from the first element (zero), through the last element (the List’s size). If there is no Actor object of that type found in the cast, that is, if the for() loop is completed, and no object of that type is found, after looking through the entire CURRENT_CAST List for a match using object.equals(), then the two statements after the for loop will be executed. The first statement will add one Actor object of that type to the CURRENT_CAST List, and the second statement will then add one Actor object of that type to the JavaFX SceneGraph. At that point, the method is finished, and will then return control to the calling entity. If an Actor object of that type is found in the CURRENT_CAST List Array, a return; statement will be called to immediately exit the method, and return control to the calling entity. This means that the statements at the end of the for() loop, which add a new Actor object of that type to the cast, as well as adding a new Actor object to the JavaFX Scene Graph root object, will not be executed. 440 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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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 474 and 475: About the Author Wallace Jackson ha
Page 476: Acknowledgments I would like to ack
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