Multiple Views - Interactive Web-Based Virtual Reality with Java 3D - page 244

Figure 6. Code segment and result for MultiViewApp.java

1. public BranchGroup createViewGraph() {

2. final int numberOfViews = 4;

3. Canvas3D canvas3D[] = new Canvas3D[numberOfViews];

4. String caption[] = {"Front View", "Side View", "Plan View", "Zoom Out View"};

5. TransformGroup viewPlatform;

6. viewManager = new ViewManager(this, 2, 2);

7. BranchGroup viewRoot = new BranchGroup();

8. TransformGroup transformGroup = new TransformGroup();

9. viewRoot.addChild(transformGroup);

10. GraphicsConfiguration config = viewManager.getPreferredGraphicsConfiguration();

11. for (int i = 0; i < numberOfViews; i++) {

12. canvas3D[i] = new Canvas3D(config);

13. viewManager.add(canvas3D[i], caption[i]);

14. viewPlatform = createViewPlatform(canvas3D[i], i);

15. transformGroup.addChild(viewPlatform); }

16. return viewRoot; }

17.
18. public TransformGroup createViewPlatform(Canvas3D canvas3D, int mode) {
19. Transform3D transform3D = vpTransform3D(mode);

20. ViewPlatform viewPlatform = new ViewPlatform();

21. TransformGroup objTransform = new TransformGroup(transform3D);

22. objTransform.addChild(viewPlatform);

23. View view = new View();

24. view.attachViewPlatform(viewPlatform);

25. view.addCanvas3D(canvas3D);

26. view.setPhysicalBody(new PhysicalBody());

27. view.setPhysicalEnvironment(new PhysicalEnvironment());

28. return objTransform; }

29.
30. public Transform3D vpTransform3D(int mode) {
31.

Transform3D transform3D = new Transform3D();

32. switch (mode) {

33. case FRONT_VIEW: break;

34. case SIDE_VIEW: transform3D.rotY(Math.PI / 2.0d); break;

35. case PLAN_VIEW: transform3D.rotX(-1 * Math.PI / 2.0d); break;

36. case ZOOM_OUT: transform3D.setTranslation(new Vector3f(0.0f, 0.0f, 3.0f)); break; }

37. return transform3D; }

views can be readily done by using appropriate transforms and associating these with the
relevant view platforms.
Following this approach, Figure 6 shows the code segment and result for getting four
views by using a loop to create a number of transform groups, view platforms, and canvas.
The transform for each platform is then initiated depending on a specific view needed by
using the method vpTransform3D.