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

public class HCanvas extends GameCanvas implements Runnable{
 private Display display;
 private boolean sleeping;
 private long frameDelay;
 private int inputDelay;
 private Random rand;
 private Image background;
 private Image chickenHead;
 private Sprite chickenSprite;
 private Sprite[] carSprite=new Sprite[4];
 private int[] carYSpeed=new int[4];
 private boolean gameOver;
 private int numLives;
 private int score;
public HCanvas(Display d){
 super(true);
 display=d;
 
 frameDelay=33;
 inputDelay=0;
    }
///////////////////////////////////////////////////////////////////////////////////
public void start(){
 display.setCurrent(this);

 rand=new Random();
 
 gameOver=false;
 numLives=3;
 score=0;
 
 try{
 background=Image.createImage("/001-G_Water01.png");
 chickenHead=Image.createImage("/019-Accessory04.png");
 
 chickenSprite=new Sprite(Image.createImage("/048-Fairy01.png"),22,22);
 chickenSprite.setPosition(2,77);

 carSprite[0]=new Sprite(Image.createImage("/029-Key01.png"));
 carSprite[0].setPosition(27,0);
 carYSpeed[0]=3;
 carSprite[1]=new Sprite(Image.createImage("/032-Item01.png"));
 carSprite[1].setPosition(62,0);
 carYSpeed[1]=1;
 carSprite[2]=new Sprite(Image.createImage("/037-Item06.png"));
 carSprite[2].setPosition(93,67);
 carYSpeed[2]=-2;
 carSprite[3]=new Sprite(Image.createImage("/040-Item09.png"));
 carSprite[3].setPosition(128,64 );
 carYSpeed[3]=-5;
    }
 catch(IOException e){
 System.out.println("failed loading image!");
       }

 sleeping=false;
 Thread t=new Thread(this);
 t.start();
  
     }
////////////////////////////////////////////////////////////////////////////////////
public void stop(){
 sleeping=true;
    }

public void run(){
 Graphics g=getGraphics();
 
 while(!sleeping){
 update();
 draw(g);
 try{
 Thread.sleep(frameDelay);
    }
 catch(InterruptedException id)
 {}
   }
   }
/////////////////////////////////////////////////////////////////////////////////////////
private void update(){
 if(gameOver){
 int keyState=getKeyStates();
 if((keyState&FIRE_PRESSED)!=0){
 chickenSprite.setPosition(2,77);
 gameOver=false;
 score=0;
 numLives=3;
          }
 return;
      }
 if(++inputDelay>2){
 int keyState=getKeyStates();
 if((keyState&LEFT_PRESSED)!=0){
 chickenSprite.move(-6,0);
 chickenSprite.nextFrame();
          }
 else if((keyState&RIGHT_PRESSED)!=0){
 chickenSprite.move(6,0);
 chickenSprite.nextFrame();
          }
 if((keyState&UP_PRESSED)!=0){
 chickenSprite.move(0,-6);
 chickenSprite.nextFrame();
        }
 else if((keyState&DOWN_PRESSED)!=0){
 chickenSprite.move(0,6);
 chickenSprite.nextFrame();
        }
 checkBounds(chickenSprite,false);
 
 inputDelay=0;
 
     }
 if(chickenSprite.getX()>154){
 AlertType.WARNING.playSound(display);

 chickenSprite.setPosition(2,77);
 score+=25;
        }
 for(int i=0;i<4;i++){
 carSprite[i].move(0,carYSpeed[i]);
 checkBounds(carSprite[i],true);

 if(chickenSprite.collidesWith(carSprite[i],true)){
 AlertType.ERROR.playSound(display);
 
 if(--numLives==0)
 {
 gameOver=true;
 }
 else
 {chickenSprite.setPosition(2,77);}
 
 break;
        }
       }
       }
////////////////////////////////////////////////////////////////////////////////////////
private void draw(Graphics g){
 g.drawImage(background,0,0,Graphics.TOP|Graphics.LEFT);
 
 for(int i=0;i<numLives;i++)
 g.drawImage(chickenHead,180-((i+1)*8),170,Graphics.TOP|Graphics.LEFT);
 
 chickenSprite.paint(g);
 
 for(int i=0;i<4;i++)
 carSprite[i].paint(g);

 if(gameOver){
 g.setColor(255,255,255);
 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("你的分数为"+score,90,70,Graphics.TOP|Graphics.HCENTER);
          }
 flushGraphics();
           }

private void checkBounds(Sprite sprite,boolean wrap){
 if(wrap){
 if(sprite.getX()<-sprite.getWidth())
 sprite.setPosition(getWidth(),sprite.getY());
 else if(sprite.getX()>getWidth())
 sprite.setPosition(-sprite.getWidth(),sprite.getY());
 if(sprite.getY()<-sprite.getHeight())
 sprite.setPosition(sprite.getX(),getHeight());
 else if(sprite.getY()>getHeight())
 sprite.setPosition(sprite.getX(),-sprite.getHeight());
  }
 else {
 if(sprite.getX()<0)
 sprite.setPosition(0,sprite.getY());
 else if(sprite.getX()>(getWidth()-sprite.getWidth()))
 sprite.setPosition(getWidth()-sprite.getWidth(),sprite.getY());
 if(sprite.getY()<0)
 sprite.setPosition(sprite.getX(),0);
 else if(sprite.getY()>(getHeight()-sprite.getHeight()))
 sprite.setPosition(sprite.getX(),getHeight()-sprite.getHeight());
      }
          }

          }

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