基于j2me的手机经典贪吃蛇游戏

import javax.microedition.lcdui.*; import java.util.Vector; public class MapCanvas extends Canvas implements CommandListener{ private Command cmdExit=new Command("退出",Command.EXIT,1); private Command cmdStart=new Command("开始",Command.SCREEN,1); private Command cmdPause=new Command("暂停",Command.SCREEN,1); private SnakeFood snakefood=new SnakeFood(); private MySnake mysnake=new MySnake(); private SnakeMoveThread snakeMovwThread; private Thread smt; private boolean isStart; private SnakeMidlet sm; public MapCanvas(SnakeMidlet sm) { this.setTitle("贪吃蛇游戏"); this.addCommand(cmdExit); this.addCommand(cmdStart); this.setCommandListener(this); snakeMovwThread=new SnakeMoveThread(mysnake,this); isStart=false; this.sm=sm; } public void paint(Graphics g) { this.overRange(); this.eatItself(); if(this.mysnake.getHeadX()==snakefood.getFoodX()&&mysnake.getHeadY()==snakefood.getFoodY()) { mysnake.snakeEatFood(); snakefood.randomChangePosition(); } g.setColor(255, 255, 255);//设置画笔颜色为白色 g.fillRect(0, 0, this.getWidth(), this.getHeight());//清屏，即设置游戏背景为白色 mysnake.drawSnake(g); //画蛇 snakefood.drawSnakeFood(g);//画食物 } public void overRange() { if(mysnake.getHeadX()<0||mysnake.getHeadY()<0||mysnake.getHeadX()>this.getWidth()-SnakeFood.FOOD_SIZE||mysnake.getHeadY()>this.getHeight()-SnakeFood.FOOD_SIZE) { sm.changeInterface("FailAlert"); } } public void eatItself() { Vector tmpVector=mysnake.getSnakeVector(); SnakeFood tmpSf; for(int i=1;i<tmpVector.size();i++) { tmpSf=(SnakeFood)tmpVector.elementAt(i); if(tmpSf.getFoodX()==mysnake.getHeadX()&&tmpSf.getFoodY()==mysnake.getHeadY()) { sm.changeInterface("FailAlert"); } } } public void commandAction(Command c,Displayable d) { if(c==cmdStart) { this.isStart=true; this.removeCommand(cmdStart); this.addCommand(cmdPause); snakeMovwThread.setIsRun(true); smt=new Thread(snakeMovwThread); smt.start(); } else if(c==cmdPause) { this.isStart=false; this.removeCommand(cmdPause); this.addCommand(cmdStart); snakeMovwThread.setIsRun(false); smt=null; } else if(c==cmdExit) { sm.notifyDestroyed(); } } protected void keyPressed(int keyCode) { int action=this.getGameAction(keyCode); if (this.isStart == true) { switch (action) { case Canvas.UP: { if (!mysnake.getDirection().equals("DOWN")) { mysnake.setDirection("UP"); mysnake.snakeMove(); } break; } case Canvas.DOWN: { if (!mysnake.getDirection().equals("UP")) { mysnake.setDirection("DOWN"); mysnake.snakeMove(); } break; } case Canvas.LEFT: { if (!mysnake.getDirection().equals("RIGHT")) { mysnake.setDirection("LEFT"); mysnake.snakeMove(); } break; } case Canvas.RIGHT: { if (!mysnake.getDirection().equals("LEFT")) { mysnake.setDirection("RIGHT"); mysnake.snakeMove(); } break; } } this.repaint(); } } }