turnobj.java

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package turnobj;

import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
import java.awt.BorderLayout;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import com.sun.j3d.loaders.Scene;
import com.sun.j3d.loaders.objectfile.ObjectFile;

/**
 * <p>Title: 转动物体</p>
 * <p>Description: 生成两个转动物体</p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>Company: 中国农业大学计算机系</p>
 * @author 彭波
 * @version 1.0
 */

public class TurnOBJ extends Applet {
  boolean isStandalone = false;
  public BranchGroup createSceneGraph(){
    BranchGroup objRoot = new BranchGroup();
    TransformGroup objScale = new TransformGroup();
    Transform3D t3d = new Transform3D();
    t3d.setScale(0.3);
    objScale.setTransform(t3d);
    objRoot.addChild(objScale);
    BoundingSphere bounds = new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
    Color3f bgColor = new Color3f(1.05f, 0.00f, 0.0f);
    Background bg = new Background(bgColor);
    bg.setApplicationBounds(bounds);
    objRoot.addChild(bg);
    Color3f light1Color = new Color3f(1.0f, 1.0f, 0.9f);
    Vector3f light1Direction= new Vector3f(4.0f, -7.0f, -12.0f);
    DirectionalLight light1 = new DirectionalLight(light1Color, light1Direction);
    light1.setInfluencingBounds(bounds);
    objRoot.addChild(light1);
    BranchGroup b1 = new objFile("galleon.obj");
    BranchGroup b2 = new objFile("beethoven.obj");
    objScale.addChild(createObject(b1, -1.2f , 0.0f ));
    objScale.addChild(createObject(b2, 1.2f , 0.0f ));
    objRoot.compile();
    return objRoot;
  }
  private Group createObject(BranchGroup b, float xpos, float ypos ){
    Transform3D t = new Transform3D();
    t.setTranslation ( new Vector3f(xpos, ypos, 0.0f ) );
    TransformGroup objTrans = new TransformGroup(t);
    TransformGroup spin = new TransformGroup();
    spin.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    spin.addChild(b);
    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, spin, yAxis, 0.0f, (float) Math.PI*2.0f);
    BoundingSphere bounds = new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
    rotator.setSchedulingBounds(bounds);
    objTrans.addChild(rotator);
    objTrans.addChild ( spin );
    return objTrans ;
  }
  public TurnOBJ() {
    setLayout(new BorderLayout());
    GraphicsConfiguration config =
           SimpleUniverse.getPreferredConfiguration();
    Canvas3D c = new Canvas3D(config);
    add("Center", c);
    BranchGroup scene = createSceneGraph();
    SimpleUniverse u = new SimpleUniverse(c);
    u.getViewingPlatform().setNominalViewingTransform();
    u.addBranchGraph(scene);
  }

  //Main method
  public static void main(String[] args) {
    TurnOBJ applet = new TurnOBJ();
    applet.isStandalone = true;
    Frame frame;
    frame = new Frame() {
      protected void processWindowEvent(WindowEvent e) {
        super.processWindowEvent(e);
        if (e.getID() == WindowEvent.WINDOW_CLOSING) {
          System.exit(0);
        }
      }
      public synchronized void setTitle(String title) {
        super.setTitle(title);
        enableEvents(AWTEvent.WINDOW_EVENT_MASK);
      }
    };
    frame.setTitle("显示两个转动物体");
    frame.add(applet, BorderLayout.CENTER);
    applet.init();
    applet.start();
    frame.setSize(400,320);
    Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
    frame.setLocation((d.width - frame.getSize().width) / 2, (d.height - frame.getSize().height) / 2);
    frame.setVisible(true);
  }
}