Door App
/*
* @(#)DoorApp.java 1.0 99/06/15 11:42:40
*
* Copyright (c) 1996-1999 Sun Microsystems, Inc. All Rights Reserved.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
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* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
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*
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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.WakeupCriterion;
import javax.media.j3d.WakeupOnAWTEvent;
import javax.media.j3d.WakeupOnBehaviorPost;
import javax.media.j3d.WakeupOnElapsedFrames;
import javax.vecmath.Matrix3d;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.geometry.ColorCube;
import com.sun.j3d.utils.universe.SimpleUniverse;
public class DoorApp extends Applet {
public class OpenBehavior extends Behavior {
private TransformGroup targetTG;
private WakeupCriterion pairPostCondition;
private WakeupCriterion wakeupNextFrame;
private WakeupCriterion AWTEventCondition;
private Transform3D t3D = new Transform3D();
private Matrix3d rotMat = new Matrix3d();
private double doorAngle;
OpenBehavior(TransformGroup targetTG) {
this.targetTG = targetTG;
AWTEventCondition = new WakeupOnAWTEvent(KeyEvent.KEY_PRESSED);
wakeupNextFrame = new WakeupOnElapsedFrames(0);
}
public void setBehaviorObjectPartner(Behavior behaviorObject) {
pairPostCondition = new WakeupOnBehaviorPost(behaviorObject, 1);
}
public void initialize() {
this.wakeupOn(AWTEventCondition);
doorAngle = 0.0;
}
public void processStimulus(Enumeration criteria) {
if (criteria.nextElement().equals(pairPostCondition)) {
System.out.println("ready to open door");
this.wakeupOn(AWTEventCondition);
doorAngle = 0.0f;
} else { // could be KeyPress or nextFrame, in either case: open
if (doorAngle < 1.6) {
doorAngle += 0.1;
if (doorAngle > 1.6)
doorAngle = 1.6;
// get rotation and scale portion of transform
targetTG.getTransform(t3D);
t3D.getRotationScale(rotMat);
// set y-axis rotation to doorAngle
// (clobber any previous y-rotation, x and z scale)
rotMat.m00 = Math.cos(doorAngle);
rotMat.m22 = rotMat.m00;
rotMat.m02 = Math.sin(doorAngle);
rotMat.m20 = -rotMat.m02;
t3D.setRotation(rotMat);
targetTG.setTransform(t3D);
this.wakeupOn(wakeupNextFrame);
} else { // finished opening door, signal other behavior
System.out.println("door is open");
this.wakeupOn(pairPostCondition);
postId(1);
}
}
}
} // end of class OpenBehavior
public class CloseBehavior extends Behavior {
private TransformGroup targetTG;
private WakeupCriterion pairPostCondition;
private WakeupCriterion wakeupNextFrame;
private WakeupCriterion AWTEventCondition;
private Transform3D t3D = new Transform3D();
private Matrix3d rotMat = new Matrix3d();
private double doorAngle;
CloseBehavior(TransformGroup targetTG) {
this.targetTG = targetTG;
AWTEventCondition = new WakeupOnAWTEvent(KeyEvent.KEY_PRESSED);
wakeupNextFrame = new WakeupOnElapsedFrames(0);
}
public void setBehaviorObjectPartner(Behavior behaviorObject) {
pairPostCondition = new WakeupOnBehaviorPost(behaviorObject, 1);
}
public void initialize() {
this.wakeupOn(pairPostCondition);
doorAngle = 1.6;
}
public void processStimulus(Enumeration criteria) {
if (criteria.nextElement().equals(pairPostCondition)) {
System.out.println("ready to close door");
this.wakeupOn(AWTEventCondition);
doorAngle = 1.6f;
} else { // could be KeyPress or nextFrame, in either case: close
if (doorAngle > 0.0) {
doorAngle -= 0.1;
if (doorAngle < 0.0)
doorAngle = 0.0;
// get rotation and scale portion of transform
targetTG.getTransform(t3D);
t3D.getRotationScale(rotMat);
// set y-axis rotation to doorAngle
// (clobber any previous y-rotation, x and z scale)
rotMat.m00 = Math.cos(doorAngle);
rotMat.m22 = rotMat.m00;
rotMat.m02 = Math.sin(doorAngle);
rotMat.m20 = -rotMat.m02;
t3D.setRotation(rotMat);
targetTG.setTransform(t3D);
this.wakeupOn(wakeupNextFrame);
} else { // finished opening door, signal other behavior
System.out.println("door is closed");
this.wakeupOn(pairPostCondition);
postId(1);
}
}
}
} // end of class CloseBehavior
public BranchGroup createSceneGraph() {
// Create the root of the branch graph
BranchGroup objRoot = new BranchGroup();
TransformGroup doorTG = new TransformGroup();
doorTG.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
doorTG.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
OpenBehavior openObject = new OpenBehavior(doorTG);
CloseBehavior closeObject = new CloseBehavior(doorTG);
//prepare the behavior objects
openObject.setBehaviorObjectPartner(closeObject);
closeObject.setBehaviorObjectPartner(openObject);
// set scheduling bounds for behavior objects
BoundingSphere bounds = new BoundingSphere();
openObject.setSchedulingBounds(bounds);
closeObject.setSchedulingBounds(bounds);
// assemble scene graph
objRoot.addChild(openObject);
objRoot.addChild(closeObject);
objRoot.addChild(doorTG);
doorTG.addChild(new ColorCube(0.4));
// Let Java 3D perform optimizations on this scene graph.
objRoot.compile();
return objRoot;
} // end of CreateSceneGraph method of DoorApp
public DoorApp() {
setLayout(new BorderLayout());
Canvas3D canvas3D = new Canvas3D(null);
add("Center", canvas3D);
// SimpleUniverse is a Convenience Utility class
SimpleUniverse simpleU = new SimpleUniverse(canvas3D);
simpleU.getViewingPlatform().setNominalViewingTransform();
BranchGroup scene = createSceneGraph();
simpleU.addBranchGraph(scene);
} // end of DoorApp (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("DoorApp.java \n- a demonstration of coordinating behavior ");
System.out.println("objects for complex behaviors in a Java 3D scene.");
System.out
.println("When the app loads, press a key to make the 'door' open and close.");
System.out
.println("This is an 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 DoorApp(), 256, 256);
} // end of main (method of DoorApp)
} // end of class DoorApp
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