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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