[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 Next click on the tracer icon at the top of the sprite editing area (it is the middle icon, that looks like a magic wand), which will open the Tracer dialog, shown in Figure 16-22. In this dialog you can set the zoom, tracing algorithm tolerance, Trace Mode and Frame mode, and see the resulting vertex count as a result of these settings. Figure 16-22. Using the Tracer utility in PhysEd to set the Tolerance, Trace mode, Frame mode and Vertices Once you have the visual result that you’re looking for, which is accomplished by tweaking the various Trace dialog settings, click on the OK button, and you will be taken back to the PhysicsEditor primary user interface window. You can then refine your collision polygon structure data point by data point, by clicking and dragging these points with your mouse, as seen in Figure 16-23. If you compare the collision polygon in Figure 16-22 with the one in Figure 16-23, you can see I that have refined several of the data points to better conform to the outline of the sprite. 364 www.it-ebooks.info
Chapter 16 ■ Collision Detection: Creating SVG Polygons for the Game Actors and Writing Code to Detect Collision Figure 16-23. Fine-tune your vertex placement for the collision polygon in the PhysicsEditor, then select your Exporter The closer you can get the collision polygon to the outline of the sprite, optimally you would want to put it right on top of the anti-aliasing that is on the pixel-edge between the sprite pixels and the transparency, or even right inside of the anti-aliasing if you want a more challenging game play. Ultimately, your collision polygons will have to be tweaked during your game development and game testing cycles, so that you get the most realistic result during your game play. If you’re developing for powerful platforms such as game consoles, you can add data points to the collision polygon, and if you’re developing for single or dual processor platforms, such as HTML5 phones or iTVs, use less data. Replacing Dummy Collision Data: InvinciBagel.java Next, let’s make some changes to your <strong>Java</strong> code in the InvinciBagel.java class, so that you are actually using this highly optimized collision polygon data that we just developed during this chapter. We will use the data set that has only 15 data points, so that we can see all of our collision polygon data in our NetBeans 8.0 code editing pane. As you can see in Figure 16-24, we will need to put the Bagel() constructor method call on three different lines: one for the iBagel = new Bagel(this) part of the instantiation, another for the collision polygon SVG data String object, and another for the xLocation, yLocation and Image object List. We will also be using our knowledge of SVG commands, which we learned from Table 16-1, to create the collision polygon data for our tileable brick elements. We will be using these brick “Prop” elements to develop our collision detection <strong>Java</strong> code later on in the chapter. We will create these simpler collision polygons using only our brains, by implementing numeric logic that relates to the resolution of the brick image, and where the corner pixel locations would be in X,Y coordinate space, in conjunction with the SVG path drawing commands that we learned about in Table 16-1. You are becoming quite a game development professional! www.it-ebooks.info 365
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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 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 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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