Multiple Views - Interactive Web-Based Virtual Reality with Java 3D - page 251

Figure 12. Code segment and result for ViewProjectionApp.java

1. public void actionPerformed(ActionEvent e) {

2. Object target = e.getSource(); // sync step sizes for both panels

3. if (target == stepSizeSel) stepSizeSel2.setSelectedIndex(stepSizeSel.getSelectedIndex());

4. else if (target == stepSizeSel2) stepSizeSel.setSelectedIndex(stepSizeSel2.getSelectedIndex());

5.

6. double topVal = updateView(topInc, topDec, topLabel, target); // get inputs for frustum projection

7. double botVal = updateView(botInc, botDec, botLabel, target);

8. double lefVal = updateView(lefInc, lefDec, lefLabel, target);

9. double rigVal = updateView(rigInc, rigDec, rigLabel, target);

10. double neaVal = updateView(neaInc, neaDec, neaLabel, target);

11. double farVal = updateView(farInc, farDec, farLabel, target);

12. Transform3D viewFrustum = new Transform3D(); // update view frustum

13. viewFrustum.frustum(lefVal, rigVal, botVal, topVal, neaVal, farVal);

14. view[0].setLeftProjection(viewFrustum);

15.
16. double fovVal = updateView(fovInc, fovDec, fovLabel, target); // get inputs for perspective proj.

17. double aspVal = updateView(aspInc, aspDec, aspLabel, target);

18. double zneVal = updateView(zneInc, zneDec, zneLabel, target);

19. double zfaVal = updateView(zfaInc, zfaDec, zfaLabel, target);

20. Transform3D viewPerspective = new Transform3D(); // update view perspective

21. viewPerspective.perspective(Math.toRadians(fovVal), aspVal, zneVal, zfaVal);

22. view[1].setLeftProjection(viewPerspective); }

23.
24. private double updateView(JButton incButton, JButton decButton, JLabel value, Object target) {

25. double tarVal = Double.parseDouble(value.getText());
26. if (target == incButton) tarVal += ((Double) stepSizeSel.getSelectedItem()).doubleValue();
27. if (target == decButton) tarVal -= ((Double) stepSizeSel.getSelectedItem()).doubleValue();
28. DecimalFormat df = new DecimalFormat("#0.00"); value.setText(df.format(tarVal));
29. return Double.parseDouble(value.getText()); }