Collision Detection: Creating SVG Polygons for the Game Actors and Writing Code to Detect Collision - Beginning Java 8 Games Development - page 545

learning how these classes work! The Java code for changing a StackPane object's im-
port, 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 ; //

replaced StackPane import with Group
public class InvinciBagel extends Application {

// all

other object declarations omitted
Group root;
public void start(Stage primaryStage) { // all

other object instantiations omitted
root = new Group ();

Figure 16-42 . Replace the StackPane UI container with the Group (Node subclass) import, declaration and instanti-
ation

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.