simplebackground.java

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//SimpleBackground.java
//演示使用背景对象
import  java.io.RandomAccessFile;
import  java.io.IOException;
import  java.applet.Applet;
import  java.awt.*;
import  java.util.Hashtable;
import  java.util.Properties;
import  javax.media.j3d.*;
import  javax.vecmath.*;

import	com.sun.j3d.utils.applet.MainFrame; 
import	com.sun.j3d.utils.image.TextureLoader;
import	com.sun.j3d.utils.universe.*;
import  com.sun.j3d.utils.behaviors.mouse.MouseRotate;
import	com.sun.j3d.utils.behaviors.keyboard.*;


public class SimpleBackground extends Applet{
	Canvas3D            canvas          = null;
	SimpleUniverse		su				= null;
	Locale              locale          = null;
	PhysicalBody        physicalBody    = null;
	PhysicalEnvironment physicalEnv     = null;
	View                view            = null;
	ViewPlatform        vp              = null;
	TransformGroup      vpTrans         = null;
	BranchGroup         sceneRoot       = null;
	float				scalingFactor	= 0.005f;
	String				filename		="747.3ds";
	//	String				bgfile			="bg.jpg";
	
	private BranchGroup createScene(){
		//创建根分支节点
		sceneRoot   = new BranchGroup();
		//创建场景范围
		BoundingSphere  bounds  =
								 new BoundingSphere( new Point3d( 0.0, 0.0, 0.0 ), 100.0 );
		//创建背景
		Background      bg      = new Background();
		//指定背景颜色
		bg.setColor(new Color3f(0.1f,0.4f,0.7f));
		//指定背景的有效范围
		bg.setApplicationBounds( bounds );
		sceneRoot.addChild( bg );
		
/*		TextureLoader myLoader = new TextureLoader( "bg.jpg", this );
		ImageComponent2D myImage = myLoader.getImage( );
		bg.setImage( myImage );
*/

		bg.setColor (new Color3f(0.0f,0.0f,0.0f));
		bg.setGeometry (createBackGraph());

		//添加环境灯
		Color3f ambientColor = new Color3f(0.1f, 0.1f, 0.1f);
		AmbientLight ambientLight = new AmbientLight(ambientColor);
		ambientLight.setInfluencingBounds(bounds);
		sceneRoot.addChild(ambientLight);
		//添加白色平行光
		Color3f light1Color = new Color3f(1.0f, 1.0f,1.0f);
		Vector3f light1Direction  = new Vector3f(4.0f, -7.0f, -12.0f);
		DirectionalLight light1
			= new DirectionalLight(light1Color, light1Direction);
		light1.setInfluencingBounds(bounds);
		sceneRoot.addChild(light1);
		//添加蓝绿色平行光
		Color3f light2Color = new Color3f(0.0f, 0.3f, 0.4f);
		Vector3f light2Direction  = new Vector3f(-6.0f, -2.0f, -1.0f);
		DirectionalLight light2
			= new DirectionalLight(light2Color, light2Direction);
		light2.setInfluencingBounds(bounds);
		sceneRoot.addChild(light2);
		//添加键盘控制功能，左右键控制旋转视角，上下键控制前进后退视角
		KeyNavigatorBehavior keyNavBeh = new KeyNavigatorBehavior(
																  su.getViewingPlatform().getViewPlatformTransform());
		keyNavBeh.setSchedulingBounds (bounds);
		sceneRoot.addChild(keyNavBeh);
		
		//缩放物体
		Transform3D	scaleT3 = new Transform3D();
		scaleT3.setScale( scalingFactor );
		TransformGroup scaleTG   = new TransformGroup( scaleT3 );
		sceneRoot.addChild( scaleTG );
		//物体绕y轴旋转90度
		Transform3D	rotyT3 = new Transform3D();
		rotyT3.rotY(Math.PI/2);
		TransformGroup rotyTG   = new TransformGroup( rotyT3 );
		scaleTG.addChild (rotyTG);
		//物体绕z轴旋转45度
		Transform3D	rotzT3 = new Transform3D();
		rotzT3.rotZ(Math.PI/4);
		TransformGroup rotzTG   = new TransformGroup( rotzT3 );
		rotyTG.addChild (rotzTG);
			
		try{	
			//导入3DS模型
			Load3DS   l           = new Load3DS( filename, this,
												 new Hashtable(), new Hashtable(),
												 new Properties() );
			rotzTG.addChild( l.root() );
		}
		catch ( IOException e ){
			System.err.println( "Exception: " + e.getMessage() );
			e.printStackTrace( System.err );
		}
		return sceneRoot;
	}
    public BranchGroup createBackGraph() {

         // Create the root of the branch graph
		BranchGroup objRoot = new BranchGroup();
		
         PointArray starGeom1 = new PointArray(7, PointArray.COORDINATES);                 
         Appearance starAppear1 = new Appearance();
         starGeom1.setCoordinate( 0, new Point3f(-0.357771f,0.268328f,-0.894427f));
         starGeom1.setCoordinate( 1, new Point3f(-0.330825f,0.271168f,-0.903893f));
         starGeom1.setCoordinate( 2, new Point3f(-0.303873f,0.27376f,-0.912533f));
         starGeom1.setCoordinate( 3, new Point3f(-0.276172f,0.276172f,-0.920575f));
         starGeom1.setCoordinate( 4, new Point3f(-0.320406f,0.243509f,-0.915447f));
         starGeom1.setCoordinate( 5, new Point3f(-0.32264f,0.214786f,-0.92183f));
         starGeom1.setCoordinate( 6, new Point3f(-0.365148f,0.182574f,-0.912871f));
         PointAttributes point1 = new PointAttributes(4.0f, false);
         starAppear1.setPointAttributes(point1);
         objRoot.addChild(new Shape3D(starGeom1, starAppear1));
		 
		 PointArray starGeom2 = new PointArray(8, PointArray.COORDINATES);                 
         Appearance starAppear2 = new Appearance();
         starGeom2.setCoordinate( 0, new Point3f(-0.232873f,0.279448f,-0.931493f));
         starGeom2.setCoordinate( 1, new Point3f(-0.249493f,0.248932f,-0.935834f));
         starGeom2.setCoordinate( 2, new Point3f(-0.265972f,0.218748f,-0.938833f));
         starGeom2.setCoordinate( 3, new Point3f(-0.282216f,0.188144f,-0.940721f));
         starGeom2.setCoordinate( 4, new Point3f(-0.219939f,0.250767f,-0.942732f));
         starGeom2.setCoordinate( 5, new Point3f(-0.206407f,0.222035f,-0.952941f));
         starGeom2.setCoordinate( 6, new Point3f(-0.19245f,0.19245f,-0.96225f));
		 starGeom2.setCoordinate( 7, new Point3f(-0.236567f,0.220481f,-0.946269f));
         PointAttributes point2 = new PointAttributes(4.0f, false);
		 point2.setPointAntialiasingEnable (true);
         starAppear2.setPointAttributes(point2);
         objRoot.addChild(new Shape3D(starGeom2, starAppear2));
		 
		 PointArray starGeom3 = new PointArray(7, PointArray.COORDINATES);                 
         Appearance starAppear3 = new Appearance();
         starGeom3.setCoordinate( 0, new Point3f(-0.188144f,0.282216f,-0.940721f));
         starGeom3.setCoordinate( 1, new Point3f(-0.174425f,0.253121f,-0.951581f));
         starGeom3.setCoordinate( 2, new Point3f(-0.160159f,0.223992f,-0.961341f));
         starGeom3.setCoordinate( 3, new Point3f(-0.145521f,0.194028f,-0.970142f));
         starGeom3.setCoordinate( 4, new Point3f(-0.128742f,0.225033f,-0.965808f));
         starGeom3.setCoordinate( 5, new Point3f(-0.111973f,0.255445f,-0.960318f));
         starGeom3.setCoordinate( 6, new Point3f(-0.0953463f,0.286039f,-0.953463f));
         PointAttributes point3 = new PointAttributes(2.0f, false);
         starAppear3.setPointAttributes(point3);
         objRoot.addChild(new Shape3D(starGeom3, starAppear3));
		 
		 PointArray starGeom4 = new PointArray(8, PointArray.COORDINATES);                 
         Appearance starAppear4 = new Appearance();
         starGeom4.setCoordinate( 0, new Point3f(-0.09759f,0.19518f,-0.9759f));
         starGeom4.setCoordinate( 1, new Point3f(-0.0808613f,0.226179f,-0.970724f));
         starGeom4.setCoordinate( 2, new Point3f(-0.064229f,0.25653f,-0.9644f));
         starGeom4.setCoordinate( 3, new Point3f(-0.0478365f,0.287019f,-0.95673f));
         starGeom4.setCoordinate( 4, new Point3f(-0.0321643f,0.256928f,-0.965895f));
         starGeom4.setCoordinate( 5, new Point3f(-0.0161648f,0.226892f,-0.973786f));
         starGeom4.setCoordinate( 6, new Point3f(0f,0.196116f,-0.980581f));
		 starGeom4.setCoordinate( 7, new Point3f(-0.048638f,0.226653f,-0.97276f));
         PointAttributes point4 = new PointAttributes(3.0f, false);
		 starAppear4.setPointAttributes(point4);
         objRoot.addChild(new Shape3D(starGeom4, starAppear4));



         int[] stripCount1 = {9};
         LineStripArray orion1 = new LineStripArray(9, LineStripArray.COORDINATES, stripCount1);
         orion1.setCoordinate( 0, new Point3f(0.0971f,-0.218475f,-0.971f));
         orion1.setCoordinate( 1, new Point3f(0.121662f,-0.194659f,-0.973296f));
         orion1.setCoordinate( 2, new Point3f(0.169129f,-0.193291f,-0.966454f));
         orion1.setCoordinate( 3, new Point3f(0.19151f,-0.215449f,-0.957552f));
         orion1.setCoordinate( 4, new Point3f(0.16738f,-0.239114f,-0.956456f));
         orion1.setCoordinate( 5, new Point3f(0.189352f,-0.26036f,-0.946762f));
         orion1.setCoordinate( 6, new Point3f(0.165313f,-0.283394f,-0.944648f));
         orion1.setCoordinate( 7, new Point3f(0.118879f,-0.28531f,-0.951034f));
         orion1.setCoordinate( 8, new Point3f(0.0959754f,-0.263932f,-0.959754f));
         objRoot.addChild(new Shape3D(orion1));
		 
		 int[] stripCount2 = {7};
         LineStripArray orion2 = new LineStripArray(7, LineStripArray.COORDINATES, stripCount2);
         orion2.setCoordinate( 0, new Point3f(0.282216f,-0.188144f,-0.940721f));
         orion2.setCoordinate( 1, new Point3f(0.345124f,-0.184066f,-0.920331f));
         orion2.setCoordinate( 2, new Point3f(0.363542f,-0.204493f,-0.908856f));
         orion2.setCoordinate( 3, new Point3f(0.359846f,-0.247394f,-0.899615f));
         orion2.setCoordinate( 4, new Point3f(0.33804f,-0.270432f,-0.901441f));
         orion2.setCoordinate( 5, new Point3f(0.276172f,-0.276172f,-0.920575f));
         orion2.setCoordinate( 6, new Point3f(0.282216f,-0.188144f,-0.940721f));
         objRoot.addChild(new Shape3D(orion2));
        
         objRoot.compile();
         return objRoot;
     } 
	public SimpleBackground(){
		//创建画布对象，这样Java 3D可以渲染场景，并添加到applet窗口
		setLayout( new BorderLayout() );
		canvas = new Canvas3D( null );
		canvas.setStereoEnable(false);
		add( "Center", canvas );
		//创建虚拟空间，这是所有场景的容器
		su = new SimpleUniverse(canvas);
		//后移视角平台，这样观察者可以看见整个场景
		su.getViewingPlatform().setNominalViewingTransform();
		//创建场景
		createScene();
		//将场景添加到虚拟空间
		su.addBranchGraph(sceneRoot);
		//得到该虚拟空间的高精度坐标系
		locale=su.getLocale();
		//创建适当的视角以便观察
		createView();
	}
	private void createView(){
		//创建观察者的头部和所处的环境
		physicalBody    = new PhysicalBody();
		physicalEnv     = new PhysicalEnvironment();
		//创建视角，只有处在视角之内的场景被渲染，是可见的
		view    = new View();
		//设置观察者
		view.setPhysicalBody( physicalBody );
		view.setPhysicalEnvironment( physicalEnv );
		//创建观察者的位置为（0，0，6），沿屏幕后退6单位
		BranchGroup     vpRoot  = new BranchGroup();
		Transform3D     t       = new Transform3D();
		t.set( new Vector3f( 0.0f, 0.0f, 6.0f ) );
		TransformGroup  vpTrans = new TransformGroup( t );
		vp = new ViewPlatform();
		vpTrans.addChild( vp );
		vpRoot.addChild( vpTrans );
		view.attachViewPlatform( vp );
		//将观察者和坐标系联系起来
		locale.addBranchGraph( vpRoot );
	}
	public static void main( String[] args ){
		Frame frame = new MainFrame(new SimpleBackground(), 500, 400);
	}
}