[JAVA][Beginning Java 8 Games Development]

Chapter 16 ■ Collision Detection: Creating SVG Polygons for the Game Actors and Writing Code to Detect Collision
objects, but only after we use the Run ➤ Project work process to see exactly how using a Group differs from using a
StackPane. After all, it’s all about learning how these classes work! The Java code for changing a StackPane object’s
import, declaration, and instantiation into a Group object should look like the following Java code, which is also shown
in Figure 16-42:
import javafx.scene.Group;
public class InvinciBagel extends Application {
Group root;
public void start(Stage primaryStage) {
root = new Group();
// replaced StackPane import with Group
// all other object declarations omitted
// all other object instantiations omitted
Figure 16-42. Replace the StackPane UI container with the Group (Node subclass) import, declaration and
instantiation
After you make these changes and Run ➤ Project, you’ll see the result shown on the left half of Figure 16-43. The
game is now using an upper-left 0,0 origin, so we’ll have to modify the rest of the existing code. Let’s do that now.
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