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How to use the mouse utility classes E-mail
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This Java tip demonstrates the use of the mouse utility classes. It allows rotation, translation and resizing of the screen image of a cube by clicking and dragging the mouse on the shape.


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.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.Color3f;
import javax.vecmath.Point3d;
import javax.vecmath.Vector3f;

import com.sun.j3d.utils.behaviors.mouse.MouseRotate;
import com.sun.j3d.utils.behaviors.mouse.MouseTranslate;
import com.sun.j3d.utils.behaviors.mouse.MouseZoom;
import com.sun.j3d.utils.geometry.Box;

/**
 * This application demonstrates the use of the mouse utility classes. It allows
 * rotation, translation and resizing of the screen image of a cube by clicking
 * and dragging the mouse on the shape.
 
 @author I.J.Palmer
 @version 1.0
 */
public class SimpleMouse extends Frame implements ActionListener {
  protected Canvas3D myCanvas3D = new Canvas3D(null);

  protected Button exitButton = new Button("Exit");

  protected BoundingSphere bounds = new BoundingSphere(new Point3d(0.00.0,
      0.0)100.0);

  /**
   * Build the view branch of the scene graph
   
   @return BranchGroup that is the root of the view branch
   */
  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 to the scene graph
   
   @param b
   *            BranchGroup that the lights are added to
   */
  protected void addLights(BranchGroup b) {
    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);
  }

  /**
   * Build the content branch for the scene graph
   
   @return BranchGroup that is the root of the content
   */
  protected BranchGroup buildContentBranch() {
    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));

    Box cube = new Box(2.0f2.0f2.0f, app);

    BranchGroup contentBranch = new BranchGroup();
    addLights(contentBranch);
    //Create the transform groups that will be
    //affected by the mouse utiltities
    TransformGroup spinGroup = new TransformGroup();
    TransformGroup zoomGroup = new TransformGroup();
    TransformGroup moveGroup = new TransformGroup();
    //Set the capabilities of the groups so that we can
    //manipulate them
    spinGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    spinGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
    zoomGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    zoomGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
    moveGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    moveGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
    //Create and use the rotation utility
    MouseRotate mouseSpin = new MouseRotate();
    mouseSpin.setTransformGroup(spinGroup);
    contentBranch.addChild(mouseSpin);
    mouseSpin.setSchedulingBounds(bounds);
    //Create and use the zoom utility
    MouseZoom mouseSize = new MouseZoom();
    mouseSize.setTransformGroup(zoomGroup);
    contentBranch.addChild(mouseSize);
    mouseSize.setSchedulingBounds(bounds);
    //Create and use the translation utility
    MouseTranslate mouseMove = new MouseTranslate();
    mouseMove.setTransformGroup(moveGroup);
    contentBranch.addChild(mouseMove);
    mouseMove.setSchedulingBounds(bounds);
    //Put it all together
    spinGroup.addChild(cube);
    moveGroup.addChild(spinGroup);
    zoomGroup.addChild(moveGroup);
    contentBranch.addChild(zoomGroup);
    return contentBranch;

  }

  /**
   * Use the action event of the exit button to end the application.
   */
  public void actionPerformed(ActionEvent e) {
    if (e.getSource() == exitButton) {
      dispose();
      System.exit(0);
    }
  }

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

  public static void main(String[] args) {
    SimpleMouse sm = new SimpleMouse();
  }
}

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