[JAVA][Beginning Java 8 Games Development]

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Chapter 11 ■ Moving Your Action Figure in 2D: Controlling the X and Y Display Screen Coordinates The Actor Image Assets Loading Method: .loadImageAssets() Now that we have declared the nine Image objects for use at the top of our InvinciBagel.java class, the next thing that we will need to do is to copy the nine PNG32 sprite images, which are named sprite0.png through sprite8.png, into the /src folder for our InvinciBagel NetBeans project. This is done using the file management utility for your operating system; in the case of my 64-bit Windows 7 OS it is the Windows Explorer utility, shown in Figure 11-4, with the Image assets copied into the C:/Users/user/MyDocuments/NetBeansProjects/InvinciBagel/src folder. All of the PNG image assets are PNG32 (24-bit RGB true color data with a 8-bit 256 gray level alpha channel) except for the back plate for the splashscreen, which is a PNG24, as it does not need an alpha channel because it is a background image plate. Figure 11-4. Copy the sprite0.png through sprite8.png files into your NetBeansProjects/InvinciBagel/src project folder Now we are ready to code the private void loadImageAssets(){...} method. Once you create a method body (declaration), you will want to copy the four Image object instantiations from your .createSplashScreenNodes() method so that all of the Image object loading is done in one central location for your game application. After that is done, you can copy and paste the scoresLayer Image instantiation and create iB0 through iB8 Image instantiations. Be sure to set the image size to 81 pixels (X and Y) and use the correct file name references, shown in the following code: private void loadImageAssets() { splashScreen = new Image("/invincibagelsplash.png", 640, 400, true, false, true); instructionLayer = new Image("/invincibagelinstruct.png", 640, 400, true, false, true); legalLayer = new Image("/invincibagelcreds.png", 640, 400, true, false, true); scoresLayer = new Image("/invincibagelscores.png", 640, 400, true, false, true); iB0 = new Image("/sprite0.png", 81, 81, true, false, true); iB1 = new Image("/sprite1.png", 81, 81, true, false, true); iB2 = new Image("/sprite2.png", 81, 81, true, false, true); iB3 = new Image("/sprite3.png", 81, 81, true, false, true); iB4 = new Image("/sprite4.png", 81, 81, true, false, true); iB5 = new Image("/sprite5.png", 81, 81, true, false, true); iB6 = new Image("/sprite6.png", 81, 81, true, false, true); iB7 = new Image("/sprite7.png", 81, 81, true, false, true); iB8 = new Image("/sprite8.png", 81, 81, true, false, true); } 234 www.it-ebooks.info
Chapter 11 ■ Moving Your Action Figure in 2D: Controlling the X and Y Display Screen Coordinates As you can see in Figure 11-5, your code is error-free, which means that you have copied your sprite assets into the proper /src folder, and you now have more than a dozen digital image assets installed for use in your game. Figure 11-5. Create a private void loadImageAssets() method, add the iB0 through iB8 and splashScreen Image objects Now that the assets you need to call your Bagel() constructor method that you created in Chapter 10 are in place, we can move on to creating a method that holds our game asset creation <strong>Java</strong> code. This amounts to calling the constructor methods for each of the Actor subclasses we eventually create, the first of which was the Bagel class, which we created first so that we can start to work on getting our primary character moving around the screen. Creating Your InvinciBagel Bagel Object: .createGameActors() The next step in the game actor creation process after loading your image assets is to call the constructor method for the game actor. To be able to do this, you must first subclass either the Actor superclass (for fixed game actors, which could be called “props”) or the Hero superclass (for motion game actors, such as the Hero, his enemies, and the like). I am going to create a .createGameActors() method to hold these instantiations, because even though initially there is only going to be one line of code inside of the body of this method, eventually, as the game becomes more and more complex, this method will serve as a “roadmap” regarding what game actor assets we have installed. This method will be declared as a private method, since the InvinciBagel class will be controlling the creation of these game actors, and will feature a void return type, because the method doesn’t return any values to the calling entity (the .start() method in this case). Inside of the method we’ll call the Bagel() constructor method, using some “placeholder” SVG path data, as well as a 0,0 initial X,Y screen location, and finally, the nine sprite cels using a comma-delimited list at the end of the constructor method call. The method body and object instantiation will use the following three lines of <strong>Java</strong> code: private void createGameActors() { iBagel = new Bagel("M150 0 L75 500 L225 200 Z", 0, 0, iB0,iB1,iB2,iB3,iB4,iB5,iB6,iB7,iB8); } www.it-ebooks.info 235
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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 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 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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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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