Mega Code Archive
Rotate when any key is pressed
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/*
* @(#)SimpleBehaviorApp.java 1.0 99/03/25 11:42:40
*
* Copyright (c) 1996-1999 Sun Microsystems, Inc. All Rights Reserved.
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import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Frame;
import java.awt.event.KeyEvent;
import java.util.Enumeration;
import javax.media.j3d.Behavior;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.media.j3d.WakeupOnAWTEvent;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.geometry.ColorCube;
import com.sun.j3d.utils.universe.SimpleUniverse;
// SimpleBehaviorApp renders a single ColorCube
// that rotates when any key is pressed.
public class SimpleBehaviorApp extends Applet {
public class SimpleBehavior extends Behavior {
private TransformGroup targetTG;
private Transform3D rotation = new Transform3D();
private double angle = 0.0;
// create SimpleBehavior
SimpleBehavior(TransformGroup targetTG) {
this.targetTG = targetTG;
}
// initialize the Behavior
// set initial wakeup condition
// called when behavior beacomes live
public void initialize() {
// set initial wakeup condition
this.wakeupOn(new WakeupOnAWTEvent(KeyEvent.KEY_PRESSED));
}
// behave
// called by Java 3D when appropriate stimulus occures
public void processStimulus(Enumeration criteria) {
// decode event
// do what is necessary
angle += 0.1;
rotation.rotY(angle);
targetTG.setTransform(rotation);
this.wakeupOn(new WakeupOnAWTEvent(KeyEvent.KEY_PRESSED));
}
} // end of class SimpleBehavior
public BranchGroup createSceneGraph() {
// Create the root of the branch graph
BranchGroup objRoot = new BranchGroup();
TransformGroup objRotate = new TransformGroup();
objRotate.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
objRoot.addChild(objRotate);
objRotate.addChild(new ColorCube(0.4));
SimpleBehavior myRotationBehavior = new SimpleBehavior(objRotate);
myRotationBehavior.setSchedulingBounds(new BoundingSphere());
objRoot.addChild(myRotationBehavior);
// Let Java 3D perform optimizations on this scene graph.
objRoot.compile();
return objRoot;
} // end of CreateSceneGraph method of SimpleBehaviorApp
// Create a simple scene and attach it to the virtual universe
public SimpleBehaviorApp() {
setLayout(new BorderLayout());
Canvas3D canvas3D = new Canvas3D(null);
add("Center", canvas3D);
BranchGroup scene = createSceneGraph();
// SimpleUniverse is a Convenience Utility class
SimpleUniverse simpleU = new SimpleUniverse(canvas3D);
// This will move the ViewPlatform back a bit so the
// objects in the scene can be viewed.
simpleU.getViewingPlatform().setNominalViewingTransform();
simpleU.addBranchGraph(scene);
} // end of SimpleBehaviorApp (constructor)
// The following allows this to be run as an application
// as well as an applet
public static void main(String[] args) {
System.out
.print("SimpleBehaviorApp.java \n- a demonstration of creating a simple");
System.out
.println("behavior class to provide interaction in a Java 3D scene.");
System.out
.println("When the app loads, press any key to make the cube rotate.");
System.out
.println("This is a simple example progam from The Java 3D API Tutorial.");
System.out.println("The Java 3D Tutorial is available on the web at:");
System.out.println("http://www.sun.com/desktop/java3d/collateral");
Frame frame = new MainFrame(new SimpleBehaviorApp(), 256, 256);
} // end of main (method of SimpleBehaviorApp)
} // end of class SimpleBehaviorApp
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