transformorder.java

Java 多媒体技术(附源码) Java 3D API JavaSound API 各种格式的多媒体数据文件 JBuilder开发环境

package transformorder;

import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.event.*;
import java.awt.*;
import java.awt.GraphicsConfiguration;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.geometry.*;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import com.sun.j3d.utils.behaviors.vp.*;

/**
 * <p>Title: 操纵三维形体行为演示</p>
 * <p>Description: 通过鼠标操作显示三维形体</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 TransformOrder extends Applet {

    boolean isStandalone = false;
    public static final int X =1;
    public static final int Y =2;
    public static final int Z =3;
    public static final int ROTATE_TOP    =4;
    public static final int TRANSLATE_TOP =5;
    public static final int NO_TRANSFORM  =6;

    private SimpleUniverse universe ;
    private BranchGroup scene;
    private Canvas3D canvas;
    private BoundingSphere bounds =
            new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 1000.0);

    private Appearance red = new Appearance();
    private Appearance yellow = new Appearance();
    private Appearance purple = new Appearance();
    Transform3D rotate = new Transform3D();
    Transform3D translate = new Transform3D();


    public void setupView() {
        OrbitBehavior orbit = new OrbitBehavior(canvas,
                OrbitBehavior.REVERSE_ALL|OrbitBehavior.STOP_ZOOM);
        orbit.setSchedulingBounds(bounds);

	ViewingPlatform viewingPlatform = universe.getViewingPlatform();
        viewingPlatform.setNominalViewingTransform();
        viewingPlatform.setViewPlatformBehavior(orbit);

	}

    Group rotateOnTop(){
          Group root=new Group();
          TransformGroup objRotate = new TransformGroup(rotate);
          TransformGroup objTranslate = new TransformGroup(translate);
          Cone redCone=
              new Cone(.3f, 0.7f, Primitive.GENERATE_NORMALS, red);
          root.addChild(objRotate);
          objRotate.addChild(objTranslate);
          objTranslate.addChild(redCone);
          return root;
    }
    Group translateOnTop(){
          Group root=new Group();
          TransformGroup objRotate = new TransformGroup(rotate);
          TransformGroup objTranslate = new TransformGroup(translate);
          Cone yellowCone=
              new Cone(.3f, 0.7f, Primitive.GENERATE_NORMALS, yellow);
          root.addChild(objTranslate);
          objTranslate.addChild(objRotate);
          objRotate.addChild(yellowCone); //tack on yellow cone
          return root;

    }

    Group noTransform(){
          Cone purpleCone=
              new Cone(.3f, 0.7f, Primitive.GENERATE_NORMALS, purple);
          return purpleCone;
    }

    public TransformGroup createAxis(int type) {

	Appearance appearance = new Appearance();
	Material lightingProps = new Material();

        Transform3D t = new Transform3D();
	switch (type) {
	   case Z:
              t.rotX(Math.toRadians(90.0));
	      lightingProps.setAmbientColor(1.0f,0.0f,0.0f);
	   break;
	   case Y:
	      lightingProps.setAmbientColor(0.0f,1.0f,0.0f);
	   break;
	   case X:
              t.rotZ(Math.toRadians(90.0));
	      lightingProps.setAmbientColor(0.0f,0.0f,1.0f);
	   break;
	   default:
	   break;
	}
	appearance.setMaterial(lightingProps);

        TransformGroup objTrans = new TransformGroup(t);
	objTrans.addChild( new Cylinder(.03f,2.5f,Primitive.GENERATE_NORMALS,appearance));
	return objTrans;
    }

    public BranchGroup createSceneGraph() {
	BranchGroup objRoot = new BranchGroup();
        rotate.rotX(Math.toRadians(45.0));
	translate.setTranslation(new Vector3f(0.0f,2.0f,1.0f));
        Material redProps = new Material();
        redProps.setAmbientColor(1.0f,0.0f,0.0f);
	red.setMaterial(redProps);

        Material yellowProps = new Material();
        yellowProps.setAmbientColor(1.0f,1.0f,0.0f);
	yellow.setMaterial(yellowProps);
        Material purpleProps = new Material();
        purpleProps.setAmbientColor(0.8f,0.0f,0.8f);
	purple.setMaterial(purpleProps);

	objRoot.addChild(createAxis(X));
	objRoot.addChild(createAxis(Y));
	objRoot.addChild(createAxis(Z));

	objRoot.addChild(noTransform());
	objRoot.addChild(rotateOnTop());
	objRoot.addChild(translateOnTop());
	Color3f lightColor = new Color3f(.3f,.3f,.3f);
        AmbientLight ambientLight= new AmbientLight(lightColor);
        ambientLight.setInfluencingBounds(bounds);
        objRoot.addChild(ambientLight);
        DirectionalLight directionalLight = new DirectionalLight();
        directionalLight.setColor(lightColor);
        directionalLight.setInfluencingBounds(bounds);
        objRoot.addChild(directionalLight);
	return objRoot;
    }

    public TransformOrder() {
    }
    public void init() {
	BranchGroup scene = createSceneGraph();
	setLayout(new BorderLayout());
        GraphicsConfiguration config =
           SimpleUniverse.getPreferredConfiguration();
	canvas = new Canvas3D(config);
	add("Center", canvas);
	universe = new SimpleUniverse(canvas);
	setupView();
	universe.addBranchGraph(scene);
    }

    public void destroy() {
	universe.removeAllLocales();
    }

  //Main method
  public static void main(String[] args) {
    TransformOrder applet = new TransformOrder();
    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("操纵三维形体行为演示");
    frame.add(applet, BorderLayout.CENTER);
    applet.init();
    applet.start();
    frame.setSize(400,400);
    Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
    frame.setLocation((d.width - frame.getSize().width) / 2, (d.height - frame.getSize().height) / 2);
    frame.setVisible(true);
  }
}