3D编程指南第三部分：粒子系统和立即模式渲染(2)[1]

作者：mydeman  文章来源：J2ME开发网

TutorialMidlet
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;
public class TutorialMidlet extends MIDlet implements CommandListener
{
    // A variable that holds the unique display
 private Display display = null;
 
 // The canvas
 private M3GCanvas canvas = null;
 
 // The MIDlet itself
 private static MIDlet self = null;
 /** Called when the application starts, and when it is resumed.
  * We ignore the resume here and allocate data for our canvas
  * in the startApp method. This is generally very bad practice.
  */
 protected void startApp() throws MIDletStateChangeException
 {
     // Allocate
  display = Display.getDisplay(this);
  canvas = new M3GCanvas(30);
 
  // Add a quit command to the canvas
  // This command won't be seen, as we
  // are running in fullScreen mode
  // but it's always nice to have a quit command
  canvas.addCommand(new Command("Quit", Command.EXIT, 1));
 
  // Set the listener to be the MIDlet
  canvas.setCommandListener(this);
 
  // Start canvas
  canvas.start();
  display.setCurrent(canvas);
 
  // Set the self
  self = this;
 }
 /** Called when the game should pause, such as during a call */
 protected void pauseApp()
 {
 
 }
 /** Called when the application should shut down */
 protected void destroyApp(boolean unconditional) throws MIDletStateChangeException
 {
     // Method that shuts down the entire MIDlet
  notifyDestroyed();
 }
 /** Listens to commands and processes */
    public void commandAction(Command c, Displayable d) {
        // If we get an EXIT command we destroy the application
        if(c.getCommandType() == Command.EXIT)
            notifyDestroyed();
    }
   
    /** Static method that quits our application
     * by using the static field 'self' */
    public static void die()
    {
        self.notifyDestroyed();
    }
}
 
M3GCanvas
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.game.GameCanvas;
import javax.microedition.m3g.Background;
import javax.microedition.m3g.Camera;
import javax.microedition.m3g.Graphics3D;
import javax.microedition.m3g.Light;
import javax.microedition.m3g.Transform;
public class M3GCanvas
extends GameCanvas
implements Runnable {
    // Thread-control
    boolean running = false;
    boolean done = true;
   
    // If the game should end
    public static boolean gameOver = false;
   
    // Rendering hints
    public static final int STRONG_RENDERING_HINTS = Graphics3D.ANTIALIAS | Graphics3D.TRUE_COLOR | Graphics3D.DITHER;
    public static final int WEAK_RENDERING_HINTS = 0;
    public static int RENDERING_HINTS = STRONG_RENDERING_HINTS;
   
    // Key array
    boolean[] key = new boolean[5];
   
    // Key constants
    public static final int FIRE = 0;
    public static final int UP = FIRE + 1;
    public static final int DOWN = UP + 1;
    public static final int LEFT = DOWN + 1;
    public static final int RIGHT = LEFT + 1;
   
    // Global identity matrix
    Transform identity = new Transform();
   
    // Global Graphics3D object
    Graphics3D g3d = null;
   
    // The background
    Background back = null;
   
    // The global camera object
    Camera cam = null;
    <