Interaction - Interactive Web-Based Virtual Reality with Java 3D - page 181

Figure 22. WakeupOnPostBehavo event and usage

WakeupOnTransformChange(TransformGroup node)
// Constructs a new WakeupOnTransformChange Criterion.

TransformGroup getTransformGroup()
// Return the TransformGroup node used in creating a certain WakeupCriterion.

Figure 23. First code segment of TransformChange.java

1. MoveBehavior(TransformGroup targetTG)

2. {

3. keyboardevent=new WakeupOnAWTEvent(KeyEvent.KEY_PRESSED);

4. this.targetTG = targetTG;

5. }

6.

7. public void initialize() this.wakeupOn(keyboardevent);

8.
9. public void keyPressed(KeyEvent e)
10. {
11. int key = e.getKeyCode(); direction = key;

12. switch(key)

13. {

14. case up: transY+=0.01;

15. translate.set(new Vector3f((float)transX, float)transY,0.0f));

16. targetTG.setTransform(translate); direct="forward"; break;

17. case down: transY-=0.01;

18. translate.set(new Vector3f((float)transX, (float)transY, 0.0f));

19. targetTG.setTransform(translate); direct="back"; break;

20. case right: transX+=0.01;

21. translate.set(new Vector3f((float)transX,(float)transY,0.0f));

22. targetTG.setTransform(translate); direct="right"; break;

23. case left: transX-=0.01;

24. translate.set(new Vector3f((float)transX,(float)transY,0.0f));

25. targetTG.setTransform(translate); direct="left"; break;

26. default:

27. }

28.
29. public void processStimulus(Enumeration criteria)
30. {
31. WakeupCriterion wakeup;

32. AWTEvent[] event;

33. while(criteria.hasMoreElements())

34. {

35. wakeup = (WakeupCriterion) criteria.nextElement();

36. event = ((WakeupOnAWTEvent)wakeup).getAWTEvent();

37. keyPressed((KeyEvent)event[0]);

38. }

39. this.wakeupOn(keyboardevent);

40. }
41.