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How to use buttons to rotate a cube E-mail
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This program uses AWT buttons to allow the user to rotate an object. This is achieved by altering the transform of a transform group.


Image

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Frame;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.media.j3d.AmbientLight;
import javax.media.j3d.Appearance;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.DirectionalLight;
import javax.media.j3d.Locale;
import javax.media.j3d.Material;
import javax.media.j3d.Node;
import javax.media.j3d.PhysicalBody;
import javax.media.j3d.PhysicalEnvironment;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.media.j3d.View;
import javax.media.j3d.ViewPlatform;
import javax.media.j3d.VirtualUniverse;
import javax.vecmath.AxisAngle4d;
import javax.vecmath.Color3f;
import javax.vecmath.Point3d;
import javax.vecmath.Vector3f;

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

/**
 * This program uses AWT buttons to allow the user to rotate an object. This is
 * achieved by altering the transform of a transform group.
 
 @author I.J.Palmer
 @version 1.0
 */
public class SimpleTransform extends Frame implements ActionListener {
  protected Canvas3D myCanvas3D = new Canvas3D(null);

  /** The exit button */
  protected Button exitButton = new Button("Exit");

  /** The rotate left button */
  protected Button leftButton = new Button("<-");

  /** The rotate right button */
  protected Button rightButton = new Button("->");

  /** The transform group used to rotate the shape */
  protected TransformGroup rotationGroup;

  /**
   * This function builds the view branch of the scene graph. It creates a
   * branch group and then creates the necessary view elements to give a
   * useful view of our content.
   
   @param c
   *            Canvas3D that will display the view
   @return BranchGroup that is the root of the view elements
   */
  protected BranchGroup buildViewBranch(Canvas3D c) {
    BranchGroup viewBranch = new BranchGroup();
    Transform3D viewXfm = new Transform3D();
    viewXfm.set(new Vector3f(0.0f0.0f10.0f));
    TransformGroup viewXfmGroup = new TransformGroup(viewXfm);
    ViewPlatform myViewPlatform = new ViewPlatform();
    PhysicalBody myBody = new PhysicalBody();
    PhysicalEnvironment myEnvironment = new PhysicalEnvironment();
    viewXfmGroup.addChild(myViewPlatform);
    viewBranch.addChild(viewXfmGroup);
    View myView = new View();
    myView.addCanvas3D(c);
    myView.attachViewPlatform(myViewPlatform);
    myView.setPhysicalBody(myBody);
    myView.setPhysicalEnvironment(myEnvironment);
    return viewBranch;
  }

  /**
   * Add some lights so that we can illuminate the scene. This adds one
   * ambient light to bring up the overall lighting level and one directional
   * shape to show the shape of the objects in the scene.
   
   @param b
   *            BranchGroup that the lights are to be added to.
   */
  protected void addLights(BranchGroup b) {
    BoundingSphere bounds = new BoundingSphere(new Point3d(0.00.00.0),
        100.0);
    Color3f ambLightColour = new Color3f(0.5f0.5f0.5f);
    AmbientLight ambLight = new AmbientLight(ambLightColour);
    ambLight.setInfluencingBounds(bounds);
    Color3f dirLightColour = new Color3f(1.0f1.0f1.0f);
    Vector3f dirLightDir = new Vector3f(-1.0f, -1.0f, -1.0f);
    DirectionalLight dirLight = new DirectionalLight(dirLightColour,
        dirLightDir);
    dirLight.setInfluencingBounds(bounds);
    b.addChild(ambLight);
    b.addChild(dirLight);
  }

  /**
   * This builds the content branch of our scene graph. The root of the shapes
   * supplied as a parameter is slightly tilted to reveal its 3D shape. It
   * also uses the addLights function to add some lights to the scene. The
   * group that the shape is added to has its capabilities set so that we can
   * read and write it.
   
   @param shape
   *            Node that represents the geometry for the content
   @return BranchGroup that is the root of the content branch
   */
  protected BranchGroup buildContentBranch(Node shape) {
    BranchGroup contentBranch = new BranchGroup();
    Transform3D rotateCube = new Transform3D();
    rotateCube.set(new AxisAngle4d(1.01.00.0, Math.PI / 4.0));
    rotationGroup = new TransformGroup(rotateCube);
    //Set the capabilities so that the transform can be accessed
    rotationGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
    rotationGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    contentBranch.addChild(rotationGroup);
    rotationGroup.addChild(shape);
    addLights(contentBranch);
    return contentBranch;
  }

  /**
   * This defines the shapes used in the scene. It creates a simple cube using
   * a Box utility class.
   
   @return Node that is the root of the shape hierarchy.
   */
  protected Node buildShape() {
    Appearance app = new Appearance();
    Color3f ambientColour = new Color3f(1.0f0.0f0.0f);
    Color3f emissiveColour = new Color3f(0.0f0.0f0.0f);
    Color3f specularColour = new Color3f(1.0f1.0f1.0f);
    Color3f diffuseColour = new Color3f(1.0f0.0f0.0f);
    float shininess = 20.0f;
    app.setMaterial(new Material(ambientColour, emissiveColour,
        diffuseColour, specularColour, shininess));
    return new Box(2.0f2.0f2.0f, app);
  }

  /**
   * This processes the AWT events and performs the appropriate operations.
   * The exit button causes the program to terminate, the left button causes a
   * rotation to be applied to the shape's transformation to spin it to the
   * left and the right has the similar effect but to the right button.
   
   @param e
   *            ActionEvent that has been performed
   */
  public void actionPerformed(ActionEvent e) {
    if (e.getSource() == exitButton) {
      dispose();
      System.exit(0);
    else if (e.getSource() == leftButton) {
      //Create a temporary transform
      Transform3D temp = new Transform3D();
      //Read the transform from the shape
      rotationGroup.getTransform(temp);
      //Create a rotation that will be applied
      Transform3D tempDelta = new Transform3D();
      tempDelta.rotY(-0.3);
      //Apply the rotation
      temp.mul(tempDelta);
      //Write the value back into the scene graph
      rotationGroup.setTransform(temp);
    else if (e.getSource() == rightButton) {
      //Do the same for the right rotation
      Transform3D temp = new Transform3D();
      rotationGroup.getTransform(temp);
      Transform3D tempDelta = new Transform3D();
      tempDelta.rotY(0.3);
      temp.mul(tempDelta);
      rotationGroup.setTransform(temp);
    }
  }

  public SimpleTransform() {
    VirtualUniverse myUniverse = new VirtualUniverse();
    Locale myLocale = new Locale(myUniverse);
    myLocale.addBranchGraph(buildViewBranch(myCanvas3D));
    myLocale.addBranchGraph(buildContentBranch(buildShape()));
    setTitle("SimpleWorld");
    setSize(400400);
    setLayout(new BorderLayout());
    Panel bottom = new Panel();
    bottom.add(leftButton);
    bottom.add(rightButton);
    bottom.add(exitButton);
    add(BorderLayout.CENTER, myCanvas3D);
    add(BorderLayout.SOUTH, bottom);
    exitButton.addActionListener(this);
    leftButton.addActionListener(this);
    rightButton.addActionListener(this);
    setVisible(true);
  }

  public static void main(String[] args) {
    SimpleTransform st = new SimpleTransform();
  }
}

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