Java tutorial
/* * @(#)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 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF * OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY * OF SUCH DAMAGES. * * This software is not designed or intended for use in on-line control of * aircraft, air traffic, aircraft navigation or aircraft communications; or in * the design, construction, operation or maintenance of any nuclear facility. * Licensee represents and warrants that it will not use or redistribute the * Software for such purposes. */ 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