[JAVA][Beginning Java 8 Games Development]

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Chapter 12 ■ Setting Boundaries for Your Action Figure in 2D: Using the Node Class LocalToParent Attribute As you can see in Figure 12-17, this will generate an error under the method call, until we code the method. Create a private void setBoundaries(){...} empty method structure underneath the .setXYLocation() method structure, so that your methods are in the same order that we will call them from inside of your .update() method. Next you will place your four conditional if() structures, one for each screen boundary, starting with the X axis related right and left screen boundaries, and then for the Y axis related bottom and top screen boundaries. The first if statement needs to look at the rightBoundary value and compare the current iX location to that value. If the iX value is greater than or equal to the rightBoundary value limit, then you want to set the iX value to the rightBoundary value. This will keep the InvinciBagel locked into position right at the boundary. The reverse of this logic will also work for the left side of the screen; if the iX value is less than or equal to the rightBoundary value limit, then you will want to set the iX value equal to the leftBoundary value. The third if statement needs to look at the bottomBoundary value and compare the current iY location to that value. If the iY value is greater than or equal to the bottomBoundary value limit, then you will want to set the iY value to the bottomBoundary value. This will keep your InvinciBagel locked into position at the bottom of the screen boundary. The reverse of this logic will also work for the top of the screen; if the iY value is less than or equal to the topBoundary value limit, then you will want to set the iY value equal to the topBoundary value. The Java code for the .setBoundaries() method including the four if() statements is shown in Figure 12-18, and should look like the following: private void setBoundaries() { if (iX >= rightBoundary) { iX=rightBoundary; } if (iX = bottomBoundary) { iY=bottomBoundary; } if (iY
Chapter 12 ■ Setting Boundaries for Your Action Figure in 2D: Using the Node Class LocalToParent Attribute Next, let’s test all of this code to see if it does what we think that it logically should do! The code is quite well organized and very logical, so I don’t see any problems with it, but testing it in NetBeans is the only real way to find out for sure! Let’s do that next. This is getting kind of exciting! Testing the InvinciBagel Sprite Boundaries: Run ➤ Project Now it is time to use the NetBeans Run ➤ Project work process and test the .setBoundaries() method, which now gets called after the .setXYLocation() method but before the .moveInvinciBagel() method. So the logical progression as it sits now is check keypressed and set X and Y location based on that, then check to make sure you have not gone past any boundaries, then position the sprite. As you can see in Figure 12-19, the InvinciBagel character now stops at all four edges of the screen. On the left and right sides he stops a short distance away from the side of the screen because the sprite is centered in the ImageView area, but once we get him running, which we will be doing in the next chapter covering how to animate the character’s movements, this will look at lot closer to the edge of the screen. We always have the option to adjust our leftBoundary and rightBoundary variable algorithms at the top of the Bagel.java class, which allows us to “tweak” the boundary limits value later on, as we continue to refine our code. Figure 12-19. Testing the InvinciBagel character movement; shown as stopping at the top and bottom boundary limits Now that we have both organized and encapsulated our code, got the sprite movement working and set the boundaries for the edges of the screen, we can start to look at implementing the different sprite image states so that when combined with the key movement, we can start to create a more realistic InvinciBagel character action figure! Summary In this twelfth chapter, we privatized our primary InvinciBagel.java class as much as possible, and removed all of the static modifier keywords that were not specifically related to constants (WIDTH and HEIGHT). First we removed the public static Boolean variables and made them private to the InvinciBagel class, and then created getter and setter methods to allow the Bagel class to use these variables using .is() method calls. We also had to pass the InvinciBagel object reference to the Bagel object inside of the front of the Bagel() constructor parameter list using the Java this keyword. We made these same changes to the static Bagel iBagel object declaration, removing the static modifier keyword and passing the InvinciBagel object context using the Java this keyword, this time inside of the GamePlayLoop() constructor method call. To do this we had to create our own custom GamePlayLoop() constructor method rather than using the one that is created by the compiler (JVM) if we do not specifically provide one. 270
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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 4 ■ An Introduction to Ja
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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 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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