wrapmovie3d.java

这是java3d三维动画播放的资料,需要的人可以下载学习一下.

package j3d_movie;

///**场景图

/* 2.创建一个棋盘世界与环幕电影。

   该环幕电影，以及计时器，使电影前进，
   设立在addmoviescreen （ ） 。

   其余的Java 3D的代码在这里已复制从checkers3d ，
   第一Java 3D的例子，在第15章
    “杀手游戏娱乐编程在Java ”
    （ http://fivedots.coe.psu.ac.th/ \u301C广告/ jg ）

*/

import javax.swing.*;
import java.awt.*;

import com.sun.j3d.utils.universe.*;
import com.sun.j3d.utils.geometry.*;
import javax.media.j3d.*;
import javax.vecmath.*;
import com.sun.j3d.utils.behaviors.vp.*;



public class WrapMovie3D extends JPanel
// Holds the 3D canvas where the loaded image is displayed
//拥有三维画布的地方装上的形象，是展示
{
  private static final int PWIDTH = 512;   // size of panel
  private static final int PHEIGHT = 512;

  private static final int BOUNDSIZE = 100;  // larger than world

  private static final Point3d USERPOSN = new Point3d(0,1.8,5.5);//三维空间
    // initial user position
    //初始用户三维空间

  private SimpleUniverse su; //虚拟空间
  private BranchGroup sceneBG; //包含对象的数据结构 、子场景图的根结点
  private BoundingSphere bounds;   // for environment nodes 场景

  private JMFMovieScreen ms;   // the movie screen 动画屏幕
  private TimeBehavior timer;  // for updating the screen 更新屏幕



  public WrapMovie3D(String fnm)
  // A panel holding a 3D canvas: the usual way of linking Java 3D to Swing
  {
    setLayout( new BorderLayout() );
    setOpaque( false );
    setPreferredSize( new Dimension(PWIDTH, PHEIGHT));

    GraphicsConfiguration config =
    SimpleUniverse.getPreferredConfiguration();
    Canvas3D canvas3D = new Canvas3D(config);
    add("Center", canvas3D);
    canvas3D.setFocusable(true);     // give focus to the canvas
    canvas3D.requestFocus();

    su = new SimpleUniverse(canvas3D);

    createSceneGraph(fnm);
    initUserPosition();        // set user's viewpoint

    orbitControls(canvas3D);   // controls for moving the viewpoint

    su.addBranchGraph( sceneBG );
  } // end of WrapMovie3D()



  private void createSceneGraph(String fnm)
  // initilise the scene
  //初始化场景图
  {
    sceneBG = new BranchGroup();
    bounds = new BoundingSphere(new Point3d(0,0,0), BOUNDSIZE);

    //lightScene();         // add the lights
    addBackground();      // add the sky
    //sceneBG.addChild( new CheckerFloor().getBG() );  // add the floor 增加背景

    addMovieScreen(fnm);  //增加动画

    sceneBG.compile();   // fix the scene 修复场景
  } // end of createSceneGraph()


/*
  //灯光效果
  private void lightScene()
  // One ambient light, 2 directional lights
  {
    Color3f white = new Color3f(1.0f, 1.0f, 1.0f);

    // Set up the ambient light
    AmbientLight ambientLightNode = new AmbientLight(white);
    ambientLightNode.setInfluencingBounds(bounds);
    sceneBG.addChild(ambientLightNode);

    // Set up the directional lights
    Vector3f light1Direction  = new Vector3f(-1.0f, -1.0f, -1.0f);
       // left, down, backwards
    Vector3f light2Direction  = new Vector3f(1.0f, -1.0f, 1.0f);
       // right, down, forwards

    DirectionalLight light1 =
            new DirectionalLight(white, light1Direction);
    light1.setInfluencingBounds(bounds);
    sceneBG.addChild(light1);

    DirectionalLight light2 =
        new DirectionalLight(white, light2Direction);
    light2.setInfluencingBounds(bounds);
    sceneBG.addChild(light2);
  }  // end of lightScene()
*/



  private void addBackground()
  // A blue sky
  //设置蓝色背景天空
  { Background back = new Background();
    back.setApplicationBounds( bounds );
    back.setColor(0.17f, 0.65f, 0.92f);    // sky colour
    sceneBG.addChild( back );
  }  // end of addBackground()



  private void orbitControls(Canvas3D c)
  /* OrbitBehaviour allows the user to rotate around the scene, and to
     zoom in and out.  */
  {
    OrbitBehavior orbit =
                new OrbitBehavior(c, OrbitBehavior.REVERSE_ALL);
    orbit.setSchedulingBounds(bounds);

    ViewingPlatform vp = su.getViewingPlatform();
    vp.setViewPlatformBehavior(orbit);
  }  // end of orbitControls()


  private void initUserPosition()
  // Set the user's initial viewpoint using lookAt()
  {
    ViewingPlatform vp = su.getViewingPlatform();
    TransformGroup steerTG = vp.getViewPlatformTransform();

    Transform3D t3d = new Transform3D();
    steerTG.getTransform(t3d);

    // args are: viewer posn, where looking, up direction
    t3d.lookAt( USERPOSN, new Point3d(0,0,0), new Vector3d(0,1,0));
    t3d.invert();

    steerTG.setTransform(t3d);
  }  // end of initUserPosition()



  // -------------------- movie screen / 观看动画播放 -----------------------

  private void addMovieScreen(String fnm)
  {
    // put the movie specified on the command line onto a movie screen
    //把fnm形式的动画投放到动画屏幕上
    ms = new JMFMovieScreen( new Point3f(0,0,0.0f), 2.0f, fnm);
    sceneBG.addChild( ms );

    // set up the timer for animating the movie
    //为animating动画建立计时器对象
    timer = new TimeBehavior(40, ms);
               // update the movie every 40ms (== 25 frames/sec)
               //更新动画每40ms一次(25帧/秒)
    timer.setSchedulingBounds( bounds );
    sceneBG.addChild( timer );
  }  // end of addMovieScreen()


  public void stopMovie()
  { timer.stopUpdate();    // shut down the timer
    ms.stopMovie();        // terminate the movie screen
  }

} // end of WrapMovie3D class