手机上J2ME的3D编程－简单创建3D立方体（2）

下面是源代码。介绍在手机上J2ME的3D编程－简单创建3D立方体（1）里面

从Midlet派生的类，是主文件

/*
 * Created on 2005-3-23
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package Box;

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

/**
 * @author Administrator
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class BoxTest extends MIDlet implements Runnable, CommandListener {

 private Display display;
 private BoxCanvas boxCanvas = new BoxCanvas();
 
 private Command cmdExit = new Command("Exit", Command.EXIT, 1);
 private Command cmdRotate = new Command("Rotate", Command.ITEM, 1);
 
 private Thread thread = null;
 /**
  *
  */
 public BoxTest() {
  super();
  // TODO Auto-generated constructor stub
 }

 /* (non-Javadoc)
  * @see javax.microedition.midlet.MIDlet#startApp()
  */
 protected void startApp() throws MIDletStateChangeException {
  // TODO Auto-generated method stub
  display = Display.getDisplay(this);
  display.setCurrent(boxCanvas);
  
  boxCanvas.addCommand(cmdExit);
  boxCanvas.addCommand(cmdRotate);
  boxCanvas.setCommandListener(this);
  
  boxCanvas.CreateWorld();
 }

 /* (non-Javadoc)
  * @see javax.microedition.midlet.MIDlet#pauseApp()
  */
 protected void pauseApp() {
  // TODO Auto-generated method stub

 }

 /* (non-Javadoc)
  * @see javax.microedition.midlet.MIDlet#destroyApp(boolean)
  */
 protected void destroyApp(boolean arg0){
  // TODO Auto-generated method stub
  
 }

 /* (non-Javadoc)
  * @see java.lang.Runnable#run()
  */
 public void run() {
  // TODO Auto-generated method stub
  while(true){
   boxCanvas.Rotate();
  }
 }

 /* (non-Javadoc)
  * @see javax.microedition.lcdui.CommandListener#commandAction(javax.microedition.lcdui.Command, javax.microedition.lcdui.Displayable)
  */
 public void commandAction(Command c, Displayable d) {
  // TODO Auto-generated method stub
  if(c == cmdExit){
   destroyApp(true);
   notifyDestroyed();
  } else if(c == cmdRotate){
   if(thread == null){
    thread = new Thread(this);
    thread.start();
   }
  }
 }

}

从Canvas派生的类

/*
 * Created on 2005-3-23
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package Box;

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Graphics;
import javax.microedition.m3g.Camera;
import javax.microedition.m3g.Graphics3D;
import javax.microedition.m3g.Mesh;
import javax.microedition.m3g.World;

/**
 * @author Administrator
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class BoxCanvas extends Canvas {

 private Camera  camera;
 private World world;
 private Graphics3D g3d = null;
 private BoxModel boxModel = new BoxModel();
 
 BoxCanvas(){
  g3d = Graphics3D.getInstance();
 }
 
 /* (non-Javadoc)
  * @see javax.microedition.lcdui.Canvas#paint(javax.microedition.lcdui.Graphics)
  */
 protected void paint(Graphics g) {
  // TODO Auto-generated method stub
  //Mesh m = boxModel.GetMesh();
  //m.translate(0,0, -1);
  Draw(g);
 }

 public void CreateWorld(){
  setFullScreenMode(true);
  
  //create a camera
        camera = new Camera();
        camera.setPerspective(60.0f, // field of view
                (float) getWidth() / (float) getHeight(), // aspectRatio
                1.0f, // near clipping plane
                1000.0f); // far clipping plane
        camera.setTranslation(0,0, 50);

        world = new World();
        world.addChild(camera);
       
        boxModel.setModel(20,20,20);
        boxModel.setImageUrl("/texture.png");
  boxModel.CreateModel();
  world.addChild(boxModel.GetMesh());
  
        world.setActiveCamera(camera);
        //System.out.println("CreateWorld Sucess!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
        repaint();
 }
 
 private void Draw(Graphics g){
  try{
            g3d.bindTarget(g);
            g3d.render(world);
        }catch(Exception e){
           
        }finally{
            g3d.releaseTarget();
        }
 }

 /**
  *
  */
 public void Rotate() {
  // TODO Auto-generated method stub
  Mesh m = boxModel.GetMesh();
  m.postRotate(1.0f, 1.0f, 0f, 0f);
  repaint();
 }
}

自定义的类，负责立方体的创建工作

/*
 * Created on 2005-3-23
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package Box;

import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import javax.microedition.m3g.Appearance;
import javax.microedition.m3g.Image2D;
import javax.microedition.m3g.Mesh;
import javax.microedition.m3g.PolygonMode;
import javax.microedition.m3g.Texture2D;
import javax.microedition.m3g.TriangleStripArray;
import javax.microedition.m3g.VertexArray;
import javax.microedition.m3g.VertexBuffer;

/**
 * @author Administrator
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class BoxModel implements Runnable{

 //Box attribute
 private int boxLength = 0;
 private int boxWidth = 0;
 private int boxHigh = 0;
 
 //
 private VertexBuffer boxVB;
 private Mesh mesh;
 
 //
 private String imageUrl = "";
 private Image texImage = null;
 private Texture2D texture=null;
 
 private int getPlus(int i){
  if(i < 0){
   i = -i;
  }
  
  return i;
 }
 
 //设置立方体的长、宽、高
 public void setModel(int l, int w, int h){
  setLength(l);
  setWidth(w);
  setHigh(h);
 }
 
 public void setLength(int l){
  this.boxLength = getPlus(l);
 }
 
 public void setWidth(int w){
  this.boxWidth = getPlus(w);
 }
 
 public void setHigh(int h){
  this.boxHigh = getPlus(h);
 }
 
 public void setImageUrl(String url){
  this.imageUrl = url;
 }
 
 public void setImage(Image img){
  this.texImage = img;
 }
 
 public void CreateModel(){
  CreateMesh();
 }
 
 private void CreateMesh(){
  short x = (short) (this.boxLength / 2);
  short y = (short) (this.boxWidth / 2);
  short z = (short) (this.boxHigh / 2);
  short fx = (short) -x;
  short fy = (short) -y;
  short fz = (short) -z;
  
  short[] vert = {x,y,z, fx,y,z, x,fy,z, fx,fy,z,  //front
      fx,y,fz, x,y,fz, fx,fy,fz, x,fy,fz, //back
      fx,y,z, fx,y,fz, fx,fy,z, fx,fy,fz, //left
      x,y,fz, x,y,z, x,fy,fz, x,fy,z,  //right
      x,y,fz, fx,y,fz, x,y,z, fx,y,z,  //top
      x,fy,z, fx,fy,z, x,fy,fz, fx,fy,fz}; //buttom
  
  VertexArray vertArray = new VertexArray(vert.length/3, 3, 2);
  vertArray.set(0, vert.length/3, vert);
  
        byte[] norm = { 0,0,127, 0,0,127, 0,0,127, 0,0,127,
            0,0,-127, 0,0,-127, 0,0,-127, 0,0,-127,
      -127,0,0, -127,0,0, -127,0,0, -127,0,0,
      127,0,0, 127,0,0, 127,0,0, 127,0,0,
      0,127,0, 0,127,0, 0,127,0, 0,127,0,
      0,-127,0, 0,-127,0, 0,-127,0, 0,-127,0};

        VertexArray normArray = new VertexArray(norm.length / 3, 3, 1);
        normArray.set(0, norm.length / 3, norm);

        short[] tex = { 1, 0, 0, 0, 1, 1, 0, 1,
            1, 0, 0, 0, 1, 1, 0, 1,
      1, 0, 0, 0, 1, 1, 0, 1,
      1, 0, 0, 0, 1, 1, 0, 1,
      1, 0, 0, 0, 1, 1, 0, 1,
      1, 0, 0, 0, 1, 1, 0, 1 };

        VertexArray texArray = new VertexArray(tex.length / 2, 2, 2);
        texArray.set(0, tex.length / 2, tex);

        // create the VertexBuffer for our object
        VertexBuffer vb = boxVB = new VertexBuffer();
        vb.setPositions(vertArray, 1.0f, null);
        vb.setNormals(normArray);
        vb.setTexCoords(0, texArray, 1.0f, null);

        // the length of each triangle strip
        int[] stripLen = { 4, 4, 4, 4, 4, 4 };

        // create the index buffer for our object (this tells how to
        // create triangle strips from the contents of the vertex buffer).
        TriangleStripArray tsa = new TriangleStripArray(0, stripLen);

        //创建多边形模式。
        PolygonMode pm = new PolygonMode();
        pm.setShading(PolygonMode.SHADE_SMOOTH);
        pm.setCulling(PolygonMode.CULL_NONE);

  //生成外貌。
        Appearance app = new Appearance();
        app.setPolygonMode(pm);

        LoadImage();
        Image texImg= this.texImage;
       
        Texture2D texture=null;
        try{
   // create texture from loaded image.
            texture = new Texture2D(new Image2D(Image2D.RGB, this.texImage));           
        }catch(Exception e){
         e.printStackTrace();
         String strErr = "Failed to create texture Use Format --- Image2D.RGB";
            System.out.println(strErr);
        }
       
        try{
   // repeat texture on surface
            texture.setWrapping(Texture2D.WRAP_REPEAT, Texture2D.WRAP_REPEAT);
           
        }catch(Exception e){
         e.printStackTrace();
            System.out.println("Failed to create texture3");
        }
       
        try{
   // Blend mode to use.
            texture.setBlending(Texture2D.FUNC_DECAL);
        }catch(Exception e){
            System.out.println("Failed to create texture4");
        }
       
        try{
   // Use nearest for performance, linear for quality
            texture.setFiltering(Texture2D.FILTER_NEAREST,Texture2D.FILTER_NEAREST);
        }catch(Exception e){
            System.out.println("Failed to create texture5");
        }
       
        try{
   app.setTexture(0, texture);
        }catch(Exception e){
            System.out.println("Failed to create texture6");
        }

  //创建网格。
        mesh = new Mesh(vb, tsa, app);
        mesh.setAppearance(0, app);
        //mesh.translate(0.0f, 0.0f, -5.0f);
 }
 
 /**
  *
  */
 private void SetTexture2D() {
  // TODO Auto-generated method stub
  int[] format = {Image2D.ALPHA,
      Image2D.LUMINANCE,
      Image2D.LUMINANCE_ALPHA,
      Image2D.RGB,
      Image2D.RGBA};
  
  for(int i=0; i<format.length;i++){
   try{
    // create texture from loaded image.
             this.texture = new Texture2D(new Image2D(format[i], this.texImage));           
         }catch(Exception e){
          e.printStackTrace();
          String strErr = "Failed to create texture Use Format --- ";
          strErr += i;
             System.out.println(strErr);
            
             continue;
         }
        
         break;
  }
 }

 //调用图片
 private void LoadImage(){
  if(this.texImage != null){
   return;
  }
  
  try{
            this.texImage = Image.createImage(this.imageUrl);
        }catch(Exception e){
         String strErr="Load Image (path=";
         strErr += this.imageUrl;
         strErr += ") Fail!";
            System.err.println(strErr);
           
            this.texImage = CreateImage();
        }
 }
 
 /**
  *
  */
 private Image CreateImage() {
  // TODO Auto-generated method stub
  Image image = null;
  
  image = Image.createImage(this.boxWidth, this.boxLength);
  
  //DrawDefaultImage(image);
  Graphics g = image.getGraphics();
  
  g.setColor(0xffff00);
  g.fillRect(0,0,image.getWidth(), image.getHeight());
  
  return image;
 }

 /**
  * @param g
  */
 public void DrawDefaultImage(Image img) {
  // TODO Auto-generated method stub
  Graphics g = img.getGraphics();
  
  g.setColor(0xffff00);
  g.fillRect(0,0,img.getWidth(), img.getHeight());
 }

 public Mesh GetMesh(){
  //System.out.println("GetMesh!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
  return this.mesh;
 }

 /* (non-Javadoc)
  * @see java.lang.Runnable#run()
  */
 public void run() {
  // TODO Auto-generated method stub
  //CreateMesh();
  //System.out.println("CreateModel Sucess!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
 }
}