1.定义数据
2.画上去
3.监听事件
键盘
事件
public class GamePanel extends JPanel implements KeyListener, ActionListener { //定义蛇的数据结构 int length;//蛇的长度 int[] snakeX = new int[600];//蛇的X坐标 int[] snakeY = new int[500];//蛇的Y坐标 String fx ;//初始化数据 //食物的坐标 int foodx; int foody; Random random = new Random(); int score;//成绩 //游戏当前的状态:开始 停止 boolean isStart = false;//默认是不开始 boolean isFile = false;//游戏失败 //定时器 一毫秒为单位 Timer timer = new Timer(100,this);//1000毫秒执行一次! //构造器 public GamePanel() { init(); //获得焦点和键盘事件 this.setFocusable(true);//获得焦点事件 this.addKeyListener(this);//获得键盘监听事件 timer.start();//游戏一开始就开始启动 } //初始化方法 public void init(){ length = 3; snakeX[0] = 100;snakeY[0] = 100; snakeX[1] = 75;snakeY[1] = 100; snakeX[2] = 50;snakeY[2] = 100; fx = "R";//初始方向向右 //把食物随即放到界面上 foodx = 25 + 25 * random.nextInt(34); foody = 75 + 25 * random.nextInt(24); score = 0; } //绘制面板,我们游戏中的所有东西都使用着一支画笔 @Override public void paintComponent(Graphics g) { super.paintComponent(g);//清屏 //绘制静态面板 this.setBackground(Color.WHITE); Data.header.paintIcon(this,g,25,11);//头部广告栏画上去 g.fillRect(25,75,850,600);//默认的游戏界面 //把小蛇画上去 if (fx.equals("R")){ Data.right.paintIcon(this,g,snakeX[0],snakeY[0]);//蛇头初始化向右,通过方向来判断 }else if(fx.equals("L")){ Data.left.paintIcon(this,g,snakeX[0],snakeY[0]);//蛇头初始化向右,通过方向来判断 }else if(fx.equals("U")){ Data.up.paintIcon(this,g,snakeX[0],snakeY[0]);//蛇头初始化向右,通过方向来判断 }else if(fx.equals("D")){ Data.down.paintIcon(this,g,snakeX[0],snakeY[0]);//蛇头初始化向右,通过方向来判断 } for (int i = 1; i < length; i++){ Data.body.paintIcon(this,g,snakeX[i],snakeY[i]); } //画积分 g.setColor(Color.white); g.setFont(new Font("微软雅黑",Font.BOLD,18)); g.drawString("长度" + length,750,35); g.drawString("分数" + score,750,50); //画食物 Data.food.paintIcon(this,g,foodx,foody); //游戏状态 if (isStart == false) { g.setColor(Color.white); g.setFont(new Font("微软雅黑",Font.BOLD,40));//设置字体 g.drawString("按下空格开始游戏",300,300); } if (isFile){ g.setColor(Color.RED); g.setFont(new Font("微软雅黑",Font.BOLD,40));//设置字体 g.drawString("失败,按下空格重新开始",300,300); } } @Override public void keyPressed(KeyEvent e) { int keyCode = e.getKeyCode(); if(keyCode == KeyEvent.VK_SPACE){ //获得键盘键是哪一个 if (isFile){ //重新开始 isFile = false; init(); }else { isStart = !isStart;//取反 } repaint(); }; //小蛇移动 if (keyCode == KeyEvent.VK_UP){ fx = "U"; }else if (keyCode == KeyEvent.VK_DOWN){ fx = "D"; }else if (keyCode == KeyEvent.VK_LEFT){ fx = "L"; }else if (keyCode == KeyEvent.VK_RIGHT){ fx = "R"; } } //事件监听--需要通过固定事件来刷新,1s =10次 @Override public void actionPerformed(ActionEvent e) { if(isStart && isFile == false){//如果游戏是开始状态,就让小蛇动起来 //吃食物 if(snakeX[0] == foodx && snakeY[0] == foody){ length++; //分数加10 score = score + 10; //再次随机食物 foodx = 25 + 25 * random.nextInt(34); foody = 75 + 25 * random.nextInt(24); } //移动 for (int i = length - 1; i > 0; i--){//后一节移到前一节的位置 snakeX[1] = snakeX[0]; snakeX[i] = snakeX[i-1]; snakeY[i] = snakeY[i-1]; } //走向 if (fx.equals("R")){ snakeX[0] = snakeX[0] + 25; if(snakeX[0] > 850) { snakeX[0] = 25; } }else if(fx.equals("L")){ snakeX[0] = snakeX[0] - 25; if(snakeX[0] < 25) { snakeX[0] = 850; } }else if(fx.equals("U")){ snakeY[0] = snakeY[0] - 25; if(snakeY[0] < 75) { snakeY[0] = 650; } }else if(fx.equals("D")){ snakeY[0] = snakeY[0] + 25; if(snakeY[0] > 650) { snakeY[0] = 75; } } //失败判断,撞到自己就算失败 for (int i = 1; i < length ; i++){ if (snakeX[0] == snakeX[i] && snakeY[0] == snakeY[i]){ isFile = true; } } //边界判断 repaint();//重画界面 } timer.start(); } @Override public void keyReleased(KeyEvent e) { } @Override public void keyTyped(KeyEvent e) { }