/* Pulsating and turning graphics */
/* Carsten Schuermann */

import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Frame;
import java.awt.event.*;
import java.awt.Font;
import java.awt.GraphicsConfiguration;
import com.sun.j3d.utils.applet.MainFrame; 
import com.sun.j3d.utils.geometry.Text2D;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import java.util.Enumeration;

public class Pulse1 extends Applet {

    public class OpenBehavior extends Behavior{

        private Text3D  targetTG;
	private WakeupCriterion yesCondition;
        private WakeupCriterion AWTEventCondition;

        OpenBehavior(Text3D targetTG){
            this.targetTG = targetTG;
            AWTEventCondition = new WakeupOnAWTEvent(KeyEvent.KEY_PRESSED);
        }

        public void setBehaviorObjectPartner(Behavior behaviorObject){
            yesCondition = new WakeupOnBehaviorPost(behaviorObject, 1);
        }

        public void initialize(){
            this.wakeupOn(AWTEventCondition);
        }
    
        public void processStimulus(Enumeration criteria){
            if (criteria.nextElement().equals(yesCondition)){
                this.wakeupOn(AWTEventCondition);
            } else {
		targetTG.setString ("Yes!");
 		this.wakeupOn(yesCondition);
		postId(1); 
            }
        }

    } // end of class OpenBehavior


    public class CloseBehavior extends Behavior{

	private Text3D  targetTG;
        private WakeupCriterion noCondition;
        private WakeupCriterion AWTEventCondition;
        private Transform3D     t3D = new Transform3D();

        CloseBehavior(Text3D targetTG){
            this.targetTG = targetTG;
            AWTEventCondition = new WakeupOnAWTEvent(KeyEvent.KEY_PRESSED);
        }

        public void setBehaviorObjectPartner(Behavior behaviorObject){
            noCondition = new WakeupOnBehaviorPost(behaviorObject, 1);
        }

        public void initialize(){
            this.wakeupOn(noCondition);
      }
    
        public void processStimulus(Enumeration criteria){
            if (criteria.nextElement().equals(noCondition)){
                this.wakeupOn(AWTEventCondition);
            } else {
		targetTG.setString ("No!");
 		this.wakeupOn(noCondition);
		postId(1);
            }
        }

    } // end of class CloseBehavior


     public BranchGroup createSceneGraph() {
         // Create the root of the branch graph
         BranchGroup objRoot = new BranchGroup();

         Transform3D t3D = new Transform3D();
         t3D.setTranslation(new Vector3f(0.0f, 0.0f, -3.0f));
         TransformGroup objMove = new TransformGroup(t3D);
         objMove.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
         objMove.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);

         objRoot.addChild(objMove);
 
         // Create the transform group node and initialize it to the 
         // identity. Add it to the root of the subgraph.
         TransformGroup objSpin = new TransformGroup();
         objSpin.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
         objSpin.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
         objMove.addChild(objSpin);

         Appearance textAppear = new Appearance();
         ColoringAttributes textColor = new ColoringAttributes();
         textColor.setColor(1.0f, 0.0f, 0.0f);
         textAppear.setColoringAttributes(textColor);
         textAppear.setMaterial(new Material());
 
         // Create a simple shape leaf node, add it to the scene graph.
         Font3D font3D = new Font3D(new Font("Times", Font.PLAIN, 1),
                                    new FontExtrusion());
         Text3D textGeom = new Text3D(font3D, new String("Maybe!"));
         textGeom.setAlignment(Text3D.ALIGN_CENTER);
         textGeom.setCapability(Text3D.ALLOW_STRING_WRITE);
         Shape3D textShape = new Shape3D();
         textShape.setGeometry(textGeom);
         textShape.setAppearance(textAppear);
         objSpin.addChild(textShape);

	 OpenBehavior   openObject  = new OpenBehavior(textGeom);
	 CloseBehavior  closeObject = new CloseBehavior(textGeom);

	 //prepare the behavior objects
	 openObject.setBehaviorObjectPartner(closeObject);
	 closeObject.setBehaviorObjectPartner(openObject);
	 
	 objRoot.addChild(openObject);
	 objRoot.addChild(closeObject);
	
         // Create a new Behavior object that will perform the desired
         // operation on the specified transform object and add it into
         // the scene graph.
         Alpha rotationAlpha = new Alpha(-1, 3000);
  
         RotationInterpolator rotator =
                 new RotationInterpolator(rotationAlpha, objSpin);
 
         // a bounding sphere specifies a region a behavior is active
         // create a sphere centered at the origin with radius of 100
         BoundingSphere bounds = new BoundingSphere();
         rotator.setSchedulingBounds(bounds);
         objSpin.addChild(rotator);
	 openObject.setSchedulingBounds(bounds);
         closeObject.setSchedulingBounds(bounds);

         DirectionalLight lightD = new DirectionalLight();
         lightD.setInfluencingBounds(bounds);
         lightD.setDirection(new Vector3f(0.0f, 0.0f, -1.0f));
         lightD.setColor(new Color3f(1.0f, 0.0f, 1.0f));
         objMove.addChild(lightD);

         AmbientLight lightA = new AmbientLight();
         lightA.setInfluencingBounds(bounds);
         objMove.addChild(lightA);

         return objRoot;
     } // end of CreateSceneGraph method

     public Pulse1() {
        setLayout(new BorderLayout());
        GraphicsConfiguration config =
            SimpleUniverse.getPreferredConfiguration();

        Canvas3D canvas3D = new Canvas3D(config);
        canvas3D.setStereoEnable(false);
        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 Pulse (constructor)

    //  The following allows this to be run as an application
    //  as well as an applet

    public static void main(String[] args) {


        Frame frame = new MainFrame(new Pulse1(), 300, 300);
   } // end of main (method of Pulse)

} // end of class Pulse