[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 16-1. Launch GIMP, and use File ➤ Open to open the sprite1.png file Click on the GIMP Fuzzy Selection Tool (icon looks like a sparkler or a magic wand), which is shown selected (depressed, as in “sunk in,” not sad) in Figure 16-2. Click on any area of the image that shows a checkerboard pattern, which always signifies transparency in any digital imaging software package, as well as many other types of software, such as the game asset creation software packages from CodeAndWeb GmbH, for instance. As you see, in Figure 16-2, you’ll get an animated, “crawling ants” outline around the transparent areas of the image, since the transparent areas have just been selected by the Fuzzy Selection Tool algorithm, which selects areas of contiguous color values. 346 www.it-ebooks.info
Chapter 16 ■ Collision Detection: Creating SVG Polygons for the Game Actors and Writing Code to Detect Collision Figure 16-2. Click in a transparent area using Fuzzy Select Tool to select Actor In this case, the Fuzzy Select tool is selecting transparency values. In fact, you should notice that you have to select an option to select transparent areas in an image, using the Fuzzy Select Tool Options dialog, which can be seen at the bottom of the Toolbox Tool Options floating palette. As you can see, I have instructed GIMP to not only “look” at the RGB plates in the image, but also to look at the Alpha plate, by selecting the “Select transparent areas” option. Now that we have that selection set that contains everything except the sprite character that we wanted to select, we need to figure out a way to get the opposite of what we now have selected. Selecting the transparent areas was admittedly much easier than trying to select the different colored areas of the InvinciBagel character! Fortunately GIMP has an algorithm that inverts the selection completely, selecting everything that is not selected, and deselecting everything that is selected. Under the GIMP 2.8 Select menu, find the Invert option, or, use the Control+I keyboard shortcut, shown on the menu next to the Invert option, all of which can be seen on the left half of Figure 16-3. Once you do this you will notice that the animated “marching ants” no longer march around the square perimeter (extents) of the digital image and that they are only around the InvinciBagel character, which means that the selection has been inverted and what we wanted to select is now contained in the selection set. www.it-ebooks.info 347
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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 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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