[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 Figure 16-3. Invert selection using Select ➤ Invert, so only Actor is selected (left); use Select ➤ To Path to convert to path The next step is to convert this raster pixel selection set (array) into a vector (path) data representation. The way that we do this in GIMP is to use the Select ➤ To Path menu sequence, seen on the right half of Figure 16-3. This will convert the selection that is around the InvinciBagel character to vector path data, which is what we want to cull. Once you convert the pixel selection into a vector path, you will get the result that is shown in Figure 16-4. 348 www.it-ebooks.info
Chapter 16 ■ Collision Detection: Creating SVG Polygons for the Game Actors and Writing Code to Detect Collision Figure 16-4. Right-click on Selection Path in Paths Palette, and Export Path In the other floating palette, click on the Paths Tab, shown on the right side of Figure 16-4. GIMP has two, primary floating tool windows; one is the GIMP Toolbox, containing Tools, Options, Brushes, Patterns, and Gradients, and the other contains four tabs, which represent your digital image’s compositing Layers, Channels, Selection Paths, and even an Undo Buffer, which gives you a “history” of every “move” you have made in GIMP since you launched it. Select the Path named Selection (the Path layer named Selection will then turn blue). Next right-click on the Path named Selection, and at the bottom of that menu of things that you can do to the Selection Path, you will see an Export Path menu option. This is another one of the key GIMP algorithms that enables this collision polygon creation and output work process for us. Selecting this Export Path option will export the current InvinciBagel character Selection Path data for us, as a text-based (XML) file containing SVG data, which is what we need to use in our Bagel() constructor method call. This data will be contained in the first String SVGdata parameter, and will replace our “dummy data” that we have been using as a placeholder thus far. Once you invoke the Export Path menu option, you will see the Export Path to SVG dialog, which is shown in Figure 16-5. As you can see, I’ve selected the “Export the active path” option, at the bottom of the dialog, since I only want to have one collision polygon path data object, and I am naming this file sprite1svgdata.svg, and I am saving it in my C:\Clients\BagelToons\InvinciBagelGame\Shape_Data folder. www.it-ebooks.info 349
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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 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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