[JAVA][Beginning Java 8 Games Development]

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Chapter 16 ■ Collision Detection: Creating SVG Polygons for the Game Actors and Writing Code to Detect Collision Not only do we need to remove this collided Actor object from the game cast using the CastingDirector class (object), we also need to remove the ImageView Node from the Scene Graph root as well. Let’s look at how to do that next, and then we will take a look at how to remove the Actor object from the CURRENT_CAST List after that. Removing Actors from the Scene Graph: .getChildren().remove() Now that we have effectively removed the Actor that the InvinciBagel collided with from the cast by adding it to the REMOVED_ACTORS HashSet object, the next step is to remove it from the JavaFX Scene Graph, which we are currently using the StackPane UI layout container class for. If you remember earlier in the book, we learned that the StackPane class can be used as a layer-based layout container, and arranges its contents using a centered XY grid. We will be learning how to use a Group object (class) as our Scene Graph root later on in the chapter, to implement the more typical upper-left corner 0,0 XY location indexing scheme and as an optimization, as we are not specifically using any of the StackPane class properties or methods, and because a Group class is a more basic class that is higher up in the Node superclass hierarchy. In this way, you will have experienced using both center screen 0,0 location referencing (StackPane), as well as the traditional upper-left 0,0 screen location referencing (a Group class as a Scene Graph root). Removing a Node object from the Scene Graph root is done using a .getChildren().remove() method chain, in the exact opposite fashion of the .getChildren.add() method call found in the .addGameActorNodes() method. Add a line of code, and type invinciBagel.root and a period, as shown in Figure 16-35, to open the method helper pop-up. Figure 16-35. Add a line of code under an .addToRemovedActors() method call and type invinciBagel.root and a period Since we are doing this ImageView Node removal from the Bagel.java class, we will use Java dot notation to preface the root object with the invinciBagel object reference before we add the .getChildren() method call, using the following invinciBagel.root.getChildren() code shown in Figure 16-35. Double-click on the remove(Object o) selection and add the object you passed into the .collide() method into the .remove() method, as seen in Figure 16-36. This will create the final invinciBagel.root.getChildren().remove(object); Java programming statement. 380 www.it-ebooks.info
Chapter 16 ■ Collision Detection: Creating SVG Polygons for the Game Actors and Writing Code to Detect Collision Figure 16-36. Investigate red error highlight under the Scene Graph root StackPane object reference in the method call Mouse-over the warning highlighting, and you will see that NetBeans sees that we are passing our custom Actor object to the .getChildren().remove() method chain, instead of the ImageView Node object. The error message also tells us that the private StackPane root; declaration in our InvinciBagel.java class will not allow us to access this object, until we remove this private access control modifier keyword. Let’s fix the most serious (error) problem first, and then fix the “Suspicious method call to java.util.Collection.remove” after that by using an object.getSpriteFrame() method call, inside of the current .remove() method call. Click on the InvinciBagel.java editing tab in NetBeans and remove the private keyword from the front of the StackPane root; object declaration, as is shown highlighted in Figure 16-37. www.it-ebooks.info 381
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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 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 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 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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