1    package j3d.cr325; 
2     
3    import com.sun.j3d.utils.applet.MainFrame; 
4    import com.sun.j3d.utils.geometry.Box; 
5    import com.sun.j3d.utils.universe.SimpleUniverse; 
6    import j3d.Utils; 
7     
8    import javax.media.j3d.*; 
9    import java.applet.Applet; 
10   import java.awt.*; 
11   import java.awt.event.KeyEvent; 
12   import java.util.Enumeration; 
13    
14    
15   /** 
16    * Create  a mandlebrot set for a box the user rotates 
17    * with a keystroke. 
18    */ 
19   public final class MandleBox extends Applet { 
20       /** 
21        * a class that lets the user 
22        * rotate the object with the keyboard. 
23        */ 
24       public static final class SimpleBehavior extends Behavior { 
25    
26           private final TransformGroup targetTG; 
27           private final Transform3D t3d = new Transform3D(); 
28           final Transform3D rotz = new Transform3D(); 
29           private double angle = 0.0; 
30    
31    
32           SimpleBehavior(final TransformGroup targetTG) { 
33               this.targetTG = targetTG; 
34           } 
35    
36           public void initialize() { 
37    
38               this.wakeupOn(new WakeupOnAWTEvent(KeyEvent.KEY_PRESSED)); 
39           } 
40    
41           public void processStimulus(final Enumeration criteria) { 
42               angle += 0.1; 
43               t3d.rotY(angle); 
44               rotz.rotZ(angle * .1); 
45               t3d.mul(rotz); 
46               targetTG.setTransform(t3d); 
47               this.wakeupOn(new WakeupOnAWTEvent(KeyEvent.KEY_PRESSED)); 
48           } 
49    
50       } 
51    
52       private static Appearance getAppearance() { 
53           final Appearance app = new Appearance(); 
54           app.setTexture(Utils.getMandleTexture(400, 400)); 
55           return app; 
56       } 
57    
58       private static BranchGroup createSceneGraph() { 
59    
60           final BranchGroup objRoot = new BranchGroup(); 
61    
62           final TransformGroup objRotate = new TransformGroup(); 
63           objRotate.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE); 
64    
65           objRoot.addChild(objRotate); 
66           final Box b = new Box(.4f, .4f, .4f, 
67                   Box.GENERATE_TEXTURE_COORDS, getAppearance()); 
68           objRotate.addChild(b); 
69    
70           final SimpleBehavior myRotationBehavior = new SimpleBehavior(objRotate); 
71           myRotationBehavior.setSchedulingBounds(new BoundingSphere()); 
72           objRoot.addChild(myRotationBehavior); 
73           objRoot.compile(); 
74    
75           return objRoot; 
76       } 
77    
78    
79       /** 
80        * create a simple scene and attach it to the 
81        * virtual universe. 
82        */ 
83       public MandleBox() { 
84           setLayout(new BorderLayout()); 
85    
86           final Canvas3D canvas3D 
87                   = new Canvas3D(SimpleUniverse.getPreferredConfiguration()); 
88           add("Center", canvas3D); 
89           final SimpleUniverse su = new SimpleUniverse(canvas3D); 
90           final BranchGroup scene = createSceneGraph(); 
91    
92           su.getViewingPlatform().setNominalViewingTransform(); 
93    
94           su.addBranchGraph(scene); 
95       } 
96    
97       /** 
98        * ignore the args. 
99        * 
100       * @param args args unused. 
101       */ 
102      public static void main(final String[] args) { 
103          new MainFrame(new MandleBox(), 256, 256); 
104      } // end of main (method of SimpleBehaviorApp) 
105   
106  } // end of class SimpleBehaviorApp 
107