movepoint.java

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package movepoint;

import java.awt.*;
import java.awt.event.*;
import java.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.*;

/**
 * <p>Title: 运动的点</p>
 * <p>Description: 生成几个运动的点</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 MovePoint extends Applet {
  boolean isStandalone = false;
  private BranchGroup createSceneGraph() {
    BranchGroup objRoot = new BranchGroup();
    objRoot.addChild(createObject());
    objRoot.compile();
    return objRoot;
  }
  private Group createObject() {
    Transform3D t = new Transform3D();
    TransformGroup objTrans = new TransformGroup(t);
    objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
    Shape3D shape = new pointShape();
    objTrans.addChild(shape);
    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);
    BoundingSphere bounds = new BoundingSphere(new Point3d(0.0,0.0,0.0), 50.0);
    rotator.setSchedulingBounds(bounds);
    objTrans.addChild(rotator);
    return objTrans;
  }
  public MovePoint() {
    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) {
    MovePoint applet = new MovePoint();
    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("显示运动的点");
    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);
  }
}