Re: [JAVA3D] Movement question

[Ben Moxon]

What is the problem?

Remember that if you want to move anything while it is part of a live scene you need 
to use a Behaviour.

-ben

-----Original Message-----
From: Discussion list for Java 3D API
[mailto:[EMAIL PROTECTED] Behalf Of ADRIANA RAMIREZ
Sent: 07 November 2003 14:40
To: [EMAIL PROTECTED]
Subject: [JAVA3D] Movement question


I've got a frame and it just pretend to be a top view
of a rectangle sweeping the frame and leaving a tale
made of white points. To achieve it I've been using
Threads.

The following is the Thread code:

public class Movement2D implements Runnable{

  public static double tx, ty, a=-0.96, b=-0.29;
  public static Thread runner;
  private double d = 0.01;

  public Movement2D() {
    runner = new Thread (this);
  }

  public void run(){
    while(true){
      double v1=0.29;
      if (b <= -v1){
        d = 0.01;
        a += 0.01;
      }
      if (b >= v1){
        d = -0.01;
        a += 0.01;
      }
      b += d;
      ty = b;
      tx = a;

      Movil2D.TransL1.setTranslation(new Vector3d(tx,
ty, 0));

Movil2D.thoraxRotate.setTransform(Movil2D.TransL1);

      try{
        runner.sleep (100);
      }
      catch(Throwable t){}
    }
  }
}


The following is the body object code:

public class Movil2D {

  private BranchGroup root;
  public static TransformGroup thoraxRotate;

  public static final double
    width = 0.02,
    height = 0.06,

  public static Transform3D TransL1, TransDots;

  public static TransformGroup Link1TG;


  public Movil2D() {

    // Create the root of the branch graph
    root = new BranchGroup();


    /*Make the figure able to rotate*/
    thoraxRotate =  new TransformGroup ();

thoraxRotate.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);

thoraxRotate.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);

thoraxRotate.setCapability(TransformGroup.ENABLE_PICK_REPORTING);
    root.addChild(thoraxRotate);

    //Set Translations
    TransL1 = new Transform3D();
    //Box (link)
    Link1TG = new TransformGroup(TransL1);
    Box legLink1 = new Box((float)width,(float)height,
(float)width, new BodyAppear().redAppearance());
    Link1TG.addChild(legLink1);
    thoraxRotate.addChild(Link1TG);

    //Let the java3D perform optimizations on this
scene
    root.compile();

  }

  public BranchGroup getLeg1BG(){
    return root;
  }
}

Now I want to introduce this code in the thread so the
box could leave a tale made of white points


    Point3f[] positions = new Point3f[1];
    positions[0]= new Point3f((float)tx,(float)ty,0f);
    PointArray point_geom = new PointArray(1,
GeometryArray.COORDINATES);
    point_geom.setCoordinates(0, positions);

    Shape3D points = new Shape3D(point_geom, new
BodyAppear().whiteAppearance());
    thoraxRotate.addChild(points);

Where the tx and ty variables are going to be refresh
by the thread every 100 milisec.

I'll apreciate any help.

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