[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 16-13. Open the sprite1svghandintegerxml.txt file As you can see in Figure 16-14, this integer representation of the collision polygon SVG data is identical to a floating point representation, which was shown in Figure 16-9. The collision polygon is now closed, due to an addition of an SVG “Z” command, at the end of the SVG data string. We are getting our collision data to be more optimized! Figure 16-14. Collision polygon is correct using integer data (left); deselect visibility in Layers Palette (right) to see SVG 358 www.it-ebooks.info
Chapter 16 ■ Collision Detection: Creating SVG Polygons for the Game Actors and Writing Code to Detect Collision You may have noticed that there are three identical X,Y data point coordinate values for every point, except for the starting and ending point, for which we have data point pairs instead of data point triplets. If you recall back in Table 16-1, the only SVG command that uses triplet (three) X,Y data point pairs is the C, or Cubic Bezier (Spline) Curve. Sure enough, as you see in Figure 16-15, right under the M (moveto) opening SVG command is the C command. This explains why GIMP put three data points in each point in your polygon. The reason all the data point triplets have the same value is because we checked the polygon option in GIMP. This puts the spline curve control handles “away” or out of sight, directly on top of the X,Y data point. This defines zero curvature, or the square polygon structure seen in Figure 16-14. Let’s export the SVG data with the triplets removed, which is shown in Figure 16-15, and see what the result looks like in GIMP, using our newfound Import Path work process, primarily for learning purposes, as we are not quite finished with the optimization work process. Figure 16-15. Remove duplicate point data for those points in the interior of the collision polygon, to further optimize Save the XML data shown in Figure 16-15 as sprite1svghandintegerxmloptimized.txt and then use the same Import Path work process, shown in Figures 16-12 and 6-13, to import this further optimized SVG data set into GIMP. As you can see in Figure 16-16, removing those cubic Bezier curve control handles from the data set also removes the polygonal nature of your collision polygon. So, we will need to do some further work on our SVG data to correct this. www.it-ebooks.info 359
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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 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 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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