//SimpleKeyBhv.java
//演示如何使用KeyNavigatorBehavior對象
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Frame;
import com.sun.j3d.utils.applet.MainFrame; 
import com.sun.j3d.utils.geometry.ColorCube;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;

import java.awt.event.*;
import java.awt.AWTEvent;
import java.util.Enumeration;
import com.sun.j3d.utils.behaviors.keyboard.*;

public class SimpleKeyBhv extends Applet {


   public BranchGroup createSceneGraph(SimpleUniverse su) {
        BranchGroup objRoot = new BranchGroup();
				// 創建根分支節點
		objRoot.addChild(new Axis());
				// 添加x,y,z坐標軸
        objRoot.addChild(new ColorCube(0.4));
				// 添加彩色六面體
		// 添加KeyNavigatorBehavior對象
        Vector3f translate = new Vector3f();
        Transform3D T3D = new Transform3D();
        TransformGroup vpTrans = su.getViewingPlatform().getViewPlatformTransform();
				// 獲得觀察者所處的TransformGroup對象
        translate.set( 0.0f, 0.0f, 5.0f);
		T3D.setTranslation(translate);
        vpTrans.setTransform(T3D);
				// 將觀察者擺放到(0,0,3)處
        KeyNavigatorBehavior keyNavBeh = new KeyNavigatorBehavior(vpTrans);
				// 添加KeyNavigatorBehavior對象
        keyNavBeh.setSchedulingBounds(new BoundingSphere(new Point3d(),1000.0));
				// 設置KeyNavigatorBehavior對象的作用范圍
        objRoot.addChild(keyNavBeh);
				// 添加到場景中接收輸入
		objRoot.compile();
        return objRoot;
    } 

    public SimpleKeyBhv() {
        setLayout(new BorderLayout());
        Canvas3D canvas3D = new Canvas3D(null);
        add("Center", canvas3D);
        SimpleUniverse simpleU = new SimpleUniverse(canvas3D);
        BranchGroup scene = createSceneGraph(simpleU);
        simpleU.addBranchGraph(scene);
    } 

    public static void main(String[] args) {
        Frame frame = new MainFrame(new SimpleKeyBhv(), 256, 256);
    } 
}