//ScaleChange.java

import java.applet.Applet;

import java.awt.*;

import java.awt.event.*;

import java.awt.GraphicsConfiguration;

import com.sun.j3d.utils.applet.MainFrame;

import com.sun.j3d.utils.geometry.ColorCube;

import com.sun.j3d.utils.universe.*;

import javax.media.j3d.*;

import javax.vecmath.*;



public class ScaleChange extends Applet implements AdjustmentListener {

  Scrollbar   sb;

  Transform3D scale3D;

  TransformGroup sliderTrans;

  float scale;



  public BranchGroup createSceneGraph() {

    BranchGroup objRoot = new BranchGroup();

    scale3D = new Transform3D();

    sliderTrans = new TransformGroup(scale3D);

    sliderTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);

    objRoot.addChild(sliderTrans);

        

    BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0);



    Color3f bgColor = new Color3f(1.0f, 1.0f, 1.0f);

    Background bg = new Background(bgColor);

      bg.setApplicationBounds(bounds);

    objRoot.addChild(bg);



    TransformGroup objTrans = new TransformGroup();

    objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);

    sliderTrans.addChild(objTrans);

    objTrans.addChild(new ColorCube(0.4));



    Transform3D yAxis = new Transform3D();

    Alpha rotationAlpha = new Alpha(-1, Alpha.INCREASING_ENABLE,

                                     0, 0, 4000, 0, 0, 0, 0, 0);



    RotationInterpolator rotator = new RotationInterpolator(rotationAlpha, 

                              objTrans, yAxis, 0.0f, (float) Math.PI*2.0f);

    rotator.setSchedulingBounds(bounds);

    sliderTrans.addChild(rotator);

    objRoot.compile();

    return objRoot;

  }



  public void adjustmentValueChanged(AdjustmentEvent e) {

    scale=(float)sb.getValue()/10.0f+1.0f;

    scale3D.setScale(scale);

    sliderTrans.setTransform(scale3D);

  }



  public ScaleChange() {

    setLayout(new BorderLayout());

    GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration();

    Canvas3D c = new Canvas3D(config);

    add("Center", c);



    sb = new Scrollbar(Scrollbar.HORIZONTAL, 0, 1, -10, 10);

    sb.addAdjustmentListener(this);

    add("South", sb);

    BranchGroup scene = createSceneGraph();

    SimpleUniverse u = new SimpleUniverse(c);

    u.getViewingPlatform().setNominalViewingTransform();

    u.addBranchGraph(scene);

  }



  public static void main(String[] args) {

    new MainFrame(new ScaleChange(), 400, 300);

  }

}

//end of ScaleChange.java