06-09-2011, 09:57 PM
error when I try to reset the child (a 3d shape representing time) of the TransformGroup in my code. However, I get no error when I invoke the createSceneGraph() method through my behavior class, but the clock remains frozen.
here is my code:
Java Syntax (Toggle Plain Text)
here is my code:
Java Syntax (Toggle Plain Text)
Code:
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import java.awt.*;
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import java.applet.*;
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import java.awt.event.*;
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import javax.media.j3d.*;
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import javax.vecmath.*;
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import com.sun.j3d.utils.universe.*;
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import com.sun.j3d.utils.geometry.*;
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import com.sun.j3d.utils.applet.MainFrame;
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import com.sun.j3d.utils.behaviors.keyboard.*;
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import java.util.*;
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public class Detyra3D extends Applet{
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Shape3D shape;
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public void init(){
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setLayout(new BorderLayout());
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Canvas3D canv = new Canvas3D(null);
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add(canv, BorderLayout.CENTER);
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BranchGroup bg = createSceneGraph();
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SimpleUniverse su = new SimpleUniverse(canv);
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su.getViewingPlatform().setNominalViewingTransform();
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su.addBranchGraph(bg);
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}
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public BranchGroup createSceneGraph(){
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BranchGroup scene = new BranchGroup();
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Transform3D tr = new Transform3D();
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tr.setScale(0.45);
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tr.setTranslation(new Vector3f(-0.9f, -0.2f, 0f));
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TransformGroup tg = new TransformGroup(tr);
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tg.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
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//this line should make possible my way of overriding
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//the processStimulus method in my Behavior class
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//to make possible re-reading of tim every half a second
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//and building a 3D shape out of it
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tg.setCapability(TransformGroup.ALLOW_CHILDREN_WRITE);
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scene.addChild(tg);
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tg.addChild(shapeClock());//-------------------------------
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//set light
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PointLight light = new PointLight(new Color3f(Color.red),
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new Point3f(1f,1f,1f),
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new Point3f(1f,0.1f,0f));
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BoundingSphere bounds = new BoundingSphere();
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light.setInfluencingBounds(bounds);
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scene.addChild(light);
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Ndihmese ndihm = new Ndihmese(this, tg);
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ndihm.setSchedulingBounds(bounds);
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scene.addChild(ndihm);
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return scene;
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}
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//I build a new shape every half a second here
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public Shape3D shapeClock(){
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Shape3D shape = new Shape3D();
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//setting appearance
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Appearance ap = new Appearance();
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ap.setMaterial(new Material());
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//I read time here
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Calendar time = new GregorianCalendar();
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int hour = time.get(time.HOUR);
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int mins = time.get(time.MINUTE);
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int secs = time.get(time.SECOND);
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//the time shall be a string, so I'm setting the font
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Font3D font = new Font3D(new Font("SansSerif", Font.PLAIN, 1),
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new FontExtrusion());
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//I build the string that represents the current time here
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String s = hour + ":" + mins + ":" + secs;
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//setting the 3D text that shall be output
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Text3D text = new Text3D(font, s);
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//creating a 3D shape out of the text above
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shape = new Shape3D(text, ap);
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//I System.out here to see if my behavior object
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//is actually working
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System.out.println(s);
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return shape;
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}
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public static void main(String[] args) {
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new MainFrame(new Detyra3D(), 720, 480);
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}
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}
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//the following is my behavior class
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import java.awt.*;
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import java.applet.*;
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import java.awt.event.*;
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import javax.media.j3d.*;
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import javax.vecmath.*;
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import com.sun.j3d.utils.universe.*;
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import com.sun.j3d.utils.geometry.*;
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import com.sun.j3d.utils.applet.MainFrame;
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import com.sun.j3d.utils.behaviors.keyboard.*;
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import java.util.*;
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import java.util.*;
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import javax.media.j3d.*;
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public class Ndihmese extends Behavior {
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TransformGroup det;
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Detyra3D detyra;
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public Ndihmese(Detyra3D d3, TransformGroup trg) {
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det = trg;
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detyra = d3;
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}
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public void initialize() {
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wakeupOn(new WakeupOnElapsedTime(500));
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}
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public void processStimulus(java.util.Enumeration enumeration) {
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det.setChild(detyra.shapeClock(), 0);
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//detyra.createSceneGraph();
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/*
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//this code rotates the scene around z-axis
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//I tried it and it worked fine, so I know my
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//classes are interacting
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int sec = Calendar.getInstance().get(Calendar.SECOND);
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Transform3D tr = new Transform3D();
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tr.rotZ(-Math.PI * sec /30.0);
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det.setTransform(tr);
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*/
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wakeupOn(new WakeupOnElapsedTime(500));
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}
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}0300-9520262
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