hcanvas.java

一个j2me的手机游戏

import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;
import java.util.*;
import java.io.*;
import javax.microedition.media.*;
import javax.microedition.media.control.*;

public class HCanvas extends GameCanvas implements Runnable {
  private Display  display;
  private boolean  sleeping;
  private long     frameDelay;
  private boolean      inputDelay;
  private Random   rand;
  private Image    background;
  private Sprite   sunSprite;
  private Sprite   houyiSprite;
  private Sprite   rowsSprite;
  private int      score;
  private Player   musicPlayer;
  private Player   celebratePlayer;
  private Player   gameoverPlayer;
  private boolean   gameOver;
  private int       numLives;
  private int      bSpeed;
  private int      sunSpeed;
   HCanvas(Display d) {
    super(true);
    display = d;

    // Set the frame rate (30 fps)
    frameDelay = 33;

    // Clear the input delay
    inputDelay = false;
  }
  
  public void start() {
    // Set the canvas as the current screen
    display.setCurrent(this);

    // Initialize the random number generator
  

    // Initialize the game variables
    score = 0;
    gameOver=false;
    numLives=12;
    inputDelay=false;
    // Initialize the background image and chicken and car sprites
    try {
      background = Image.createImage("/Highway.png");
    

      sunSprite = new Sprite(Image.createImage("/Sun.png"));
      sunSprite.setPosition(160, 160);
      
      houyiSprite = new Sprite(Image.createImage("/houyi3.png"));
      houyiSprite.setPosition(0, 3);
      rowsSprite=new Sprite(Image.createImage("/Row.png"));
      rowsSprite.setPosition(6,20);
    }
    catch (IOException e) {
      System.err.println("Failed loading images!");
    }

    // Initialize the music and wave players
    try {
      InputStream is = getClass().getResourceAsStream("Music.mid");
      musicPlayer = Manager.createPlayer(is, "audio/midi");
      musicPlayer.prefetch();
      is = getClass().getResourceAsStream("Celebrate.wav");
      celebratePlayer = Manager.createPlayer(is, "audio/X-wav");
      celebratePlayer.prefetch();
      
      is = getClass().getResourceAsStream("GameOver.wav");
      gameoverPlayer = Manager.createPlayer(is, "audio/X-wav");
      gameoverPlayer.prefetch();
    }
    catch (IOException ioe) {
    }
    catch (MediaException me) {
    }

    // Start playing the music indefinitely
    try {
      musicPlayer.setLoopCount(-1);
      musicPlayer.start();
    }
    catch (MediaException me) {
    }

    // Start the animation thread
    sleeping = false;
    Thread t = new Thread(this);
    t.start();
  }
  
  public void stop() {
    // Close the music and wave players
    musicPlayer.close();
    celebratePlayer.close();
    gameoverPlayer.close();

    // Stop the animation
    sleeping = true;
  }
  
  public void run() {
    Graphics g = getGraphics();
    
    // The main game loop
    while (!sleeping) {
    
    
    bSpeed=5;
    	if(sunSprite.getY()<-4)
    	sunSprite.setPosition(160, 160);
        
     else
    	sunSprite.move(0,-bSpeed);
      update();
      draw(g);
      try {
        Thread.sleep(frameDelay);
      }
      catch (InterruptedException ie) {}
    }
  }

  private void update() {
    // Check to see whether the game is being restarted
    if (gameOver) {
      int keyState = getKeyStates();
      if ((keyState & FIRE_PRESSED) != 0) {
        // Start a new game
        try {
          musicPlayer.setMediaTime(0);
          musicPlayer.start();
        }
        catch (MediaException me) {
        }
        sunSprite.setPosition(160, 160);
        gameOver = false;
        score = 0;
        numLives=12;
        inputDelay=false;
      }

      // The game is over, so don't update anything
      return;
    }

    // Process user input to move the chicken
  if (!inputDelay) {
    
      int keyState = getKeyStates();
      if ((keyState & RIGHT_PRESSED) != 0) 
 {     --numLives;
      inputDelay = true;}
      }
      if(inputDelay)
      	rowsSprite.move(9, 0);
      
      	
   if (rowsSprite.collidesWith(sunSprite, true))
      {
      // Play a sound for making it safely across
      try {
        celebratePlayer.start();
        }
      catch (MediaException me) {}
    
      // Reset the chicken position and increment the score
      sunSprite.setPosition(160, 160);
      rowsSprite.setPosition(6,20);
      score ++;
      inputDelay=false;
    }
     else{ if(rowsSprite.getX()>getWidth())
       { inputDelay=false;
       	rowsSprite.setPosition(6,20);
       	}
}
        // Check for a game over
        if (numLives == 0) {
          // Stop the music and play a game over sound
          try {
            musicPlayer.stop();
            gameoverPlayer.start();
          }
          catch (MediaException me) {
          }

          gameOver = true;
        }

        // No need to continue updating the car sprites
      return;
}




  private void draw(Graphics g) {
    // Draw the highway background
    g.drawImage(background, 0, 0, Graphics.TOP | Graphics.LEFT);
    // Draw the chicken sprite
    houyiSprite.paint(g);
    sunSprite.paint(g);
    rowsSprite.paint(g);
    if (gameOver) {
      // Draw the game over message and score
      g.setColor(255, 255, 255); // white
      g.setFont(Font.getFont(Font.FACE_MONOSPACE, Font.STYLE_BOLD, Font.SIZE_LARGE));
      g.drawString("GAME OVER", 90, 40, Graphics.TOP | Graphics.HCENTER);
      g.setFont(Font.getFont(Font.FACE_MONOSPACE, Font.STYLE_BOLD, Font.SIZE_MEDIUM));
      g.drawString("You scored " + score + " points.", 90, 70, Graphics.TOP |Graphics.HCENTER);
    }

    // Flush the offscreen graphics buffer
    flushGraphics();
       
     }
     }