[JAVA][Beginning Java 8 Games Development]

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Chapter 9 ■ Controlling Your Action Figure: Implementing Java Event Handlers and Using Lambda Expressions Finishing the UI Design: Coding a Game Play Button The next thing that we will need to do is to finish the Button control event handling code so that when we click on the GAME PLAY Button object, the white background is revealed for us to develop our game over. Later on we can use the ImageView plates that we use for our splash screen support to provide background image compositing for the game to make it more interesting visually. The way that we are going to hide the two ImageView Node objects in the Scene Graph is by calling the .setVisible() method off of each of these objects inside of the .handle() method that is attached to the PLAY GAME UI Button object. This can be seen in the bottom portion of Figure 9-2, and would be implemented using the following two lines of Java code, inside of the .handle() EventHandler method structure: splashScreenBackplate.setVisible(false); splashScreenTextArea.setVisible(false); Figure 9-2. Use a .setVisible() method for the ImageView class to hide background image plates and reveal White color As you can see, there is also a wavy yellow warning highlight under the EventHandler part of this event handling structure which relates to Java lambda expressions. After we finish implementing all of the final UI design code for the Buttons that controls what is visible to the player, and which imagery it is showing them, I will get into lambda expressions, and we will get rid of these warning messages in your code as well. After that, we’ll move on to implement arrow key event handling structures, so that the user can navigate the InvinciBagel around the screen. First, let’s test the code that we put into the previously empty PLAY GAME Button event handling structure. www.it-ebooks.info 189
Chapter 9 ■ Controlling Your Action Figure: Implementing Java Event Handlers and Using Lambda Expressions Testing the Game Play Button: Making Sure Your Code Works Use the Run ➤ Project (or the Run icon at the top of the IDE that looks like a video play transport button) to launch your InvinciBagel game and click on the PLAY GAME Button on the bottom left of the window. As you can see in Figure 9-3, the screen turns white because the two ImageView image plates are not visible anymore and your white background color is shining through! You will notice if you click on the other three Button controls that they do not work anymore. Actually they are working, but they are not visible anymore, so the UI design now seems to be broken! Figure 9-3. Run the Project, and test the PLAY GAME Button to reveal white background So now we have an ability to see what we are doing going into our game play design chapters, which are the next eight in the book. All that we have to do now is to fix (or rather upgrade) the other three Button controls event handling structures to include method calls to make sure that the ImageView Node objects are visible so that they can show the image content that we want them to display to our players. Let’s take care of this next, since we are working on the Button UI design for our InvinciBagel game, and then we can take a look at the new Java 8 lambda expressions. Upgrading the Other UI Button Code: Making ImageView Visible Let’s add a couple of lines of code to each of the three existing Button event handling structures that will make sure that both ImageView image plates are set to be visible whenever these Button control objects are clicked. The reason that we need to put this code into each of the three other UI Button event handling structures is because we do not know what order the user will click on the Buttons, so we need to put these statements into each Button event handler. If the ImageView Node objects are already set as visible when these statements are triggered, then they will simply remain visible, because they were already previously visible! The Java method calls will look like the following: splashScreenBackplate.setVisible(false); splashScreenTextArea.setVisible(false); As you can see highlighted in Figure 9-4, I’ve installed these (identical, except for the Image object that they reference) two statements inside of the other three Button event handling structures. These statements can go either before or after the existing method calls inside each of these .handle() methods. 190 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 4 ■ An Introduction to Ja
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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 11 ■ Moving Your Action F
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Chapter 12 Setting Boundaries for Y
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Chapter 12 ■ Setting Boundaries f
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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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