m3gcanvas.java

3D手机游戏开发实例源代码 3D迷宫游戏的演示程序

import javax.microedition.lcdui.*;
import javax.microedition.m3g.*;
import javax.microedition.lcdui.game.*;

public class M3GCanvas extends GameCanvas implements Runnable
{
  private Command exitCmd; 

  private Graphics3D g3d;
  private Graphics g2d;

  private World world;

  private Image2D image2D;
  private MobileCamera mobileCamera;
  private Group cameraGroup;
  private Tree tree1, tree2, tree3;   // tree billboards




  public M3GCanvas() 
  { super(false);




    g3d = Graphics3D.getInstance();
    world = new World();   // create scene graph
    buildScene();
    Thread t = new Thread(this);
    t.start();
    // start the animation
  
  }  // end of SkinCanvas()


    public void run() {
        g2d = getGraphics();
        while(true){
        try{
            g3d.bindTarget(g2d); // Binds the given Graphics or mutable Image2D as the rendering target of this Graphics3D
            //g3d.clear(null);
            g3d.render(world);
        }finally{
            g3d.releaseTarget();
        }
            mobileCamera.update();
            tree1.align();  // align the billboards with the camera position
            tree2.align();
            tree3.align();
            g2d.setColor(255,255,255);
            g2d.drawString( mobileCamera.getKeyMode(), 5,5, Graphics.TOP|Graphics.LEFT);
            g2d.drawString( mobileCamera.getPosition(), 5,18, Graphics.TOP|Graphics.LEFT);
            g2d.drawString( mobileCamera.getRotation(), 5,31, Graphics.TOP|Graphics.LEFT);
            flushGraphics();
        }
    }

  private void buildScene()
  /* Add a background, camera, trees, the bending model,
     and a floor to the scene. There are no lights needed,
     since nothing uses a Material component.
  */
  { /* The ordering of the first three methods is important.
       The Billboard trees need a reference to the camera, and
       the camera needs a reference to the background. */

    addCamera();
    addTrees();
    addFloor();
  } // end of buildScene()


  private void addCamera()
  {
    mobileCamera = new MobileCamera(getWidth(),getHeight());  
    
    cameraGroup = mobileCamera.getCameraGroup();
    world.addChild( cameraGroup );
    world.setActiveCamera( mobileCamera.getCamera() ); 
  }  // end of addCamera()


  private void addTrees()
   { 
 

    image2D = loadImage("/tree1.png");
    tree1 = new Tree(image2D, cameraGroup, 1.5f, 0, 2.0f);
                            // needs a ref. to cameraGroup
    world.addChild( tree1.getMesh() );

    image2D = loadImage("/tree2.png");
    tree2 = new Tree(image2D, cameraGroup, -2.0f, -2.0f, 1.5f);
                            // needs a ref. to cameraGroup
    world.addChild( tree2.getMesh() );

    image2D = loadImage("/tree3.png");
    tree3 = new Tree(image2D, cameraGroup, 0.5f, -3.2f, 1.5f);
                            // needs a ref. to cameraGroup
    world.addChild( tree3.getMesh() );
  } // end of addTrees()
  private void addFloor()


  {


    image2D = loadImage("/grass.png"); 
    TiledFloor floor = new TiledFloor( image2D, 8);   
      // 8 by 8 size, made up of 1 by 1 tiles

    world.addChild( floor.getFloorMesh() );  // add the floor
  }  // end of addFloor()


  private Image2D loadImage(String filename)

  { 
    try {
       image2D = (Image2D)Loader.load(filename)[0];
    }
    catch (Exception e)
    { System.out.println("Cannot make image from " + filename); }
    return image2D;
  }  



  // ------------ process key presses and releases ------------


  protected void keyPressed(int keyCode)
  { int gameAction = getGameAction(keyCode);
    mobileCamera.pressedKey(gameAction);
  }

  protected void keyReleased(int keyCode)
  { int gameAction = getGameAction(keyCode);
    mobileCamera.releasedKey(gameAction);
  }

  // ------------------ update and paint the canvas ------------------

 


 


}  // end of SkinCanvas class