贪吃蛇练习

/** * 保存数据的类 */ public class MyData { public static URL headerUrl = MyData.class.getResource("statics/header.png"); public static URL bodyUrl = MyData.class.getResource("statics/body.png"); public static URL foodUrl = MyData.class.getResource("statics/food.png"); public static URL upUrl = MyData.class.getResource("statics/up.png"); public static URL downUrl = MyData.class.getResource("statics/down.png"); public static URL leftUrl = MyData.class.getResource("statics/left.png"); public static URL rightUrl = MyData.class.getResource("statics/right.png"); public static ImageIcon header = new ImageIcon(headerUrl); public static ImageIcon body = new ImageIcon(bodyUrl); public static ImageIcon food = new ImageIcon(foodUrl); public static ImageIcon up = new ImageIcon(upUrl); public static ImageIcon down = new ImageIcon(downUrl); public static ImageIcon left = new ImageIcon(leftUrl); public static ImageIcon right = new ImageIcon(rightUrl); } /** * 游戏面板 */ 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[600]; //蛇的y坐标 String direction; //蛇头方向 boolean isStart; //游戏状态(开始true、停止false) //食物的坐标 int foodX; int foodY; Random random = new Random(); //判断失败状态 boolean isFail; //积分 int score; //定时器 Timer timer = new Timer(100,this); //100毫秒执行一次actionPerformed()方法 //构造器 public GamePanel(){ init(); this.setFocusable(true);//获得焦点事件 this.addKeyListener(this);//获得键盘监听事件 } //初始化方法 public void init(){ length = 3; direction = "R"; //默认蛇头方向向右 isStart = false; //默认不开始 snakeX[0] = 100;snakeY[0] = 75; //头部坐标 snakeX[1] = 75;snakeY[1] = 75; //第一个身体的坐标 snakeX[2] = 50;snakeY[2] = 75; //第二个身体的坐标 timer.start(); //定时器开启 isFail = false; //初始状态为正常 score = 0; //把食物随机分布在游戏面板上 foodX = 25+25*random.nextInt(34); //25的初始值+随机25个宽，最多只能是34个25宽 foodY = 25+25*random.nextInt(30); //25的初始值+随机25个高，最多只能是30个25宽 } //绘制面板 游戏所有的绘制都是用这个画笔绘制的 @Override protected void paintComponent(Graphics g) { super.paintComponent(g); this.setBackground(Color.white); //绘制头部广告栏 //MyData.header.paintIcon(this,g,20,11); //绘制游戏背景面板 g.fillRect(25,50,850,750); //绘制食物 MyData.food.paintIcon(this,g,foodX,foodY); //绘制积分面板 g.setColor(Color.RED); g.setFont(new Font("微软雅黑",Font.BOLD,25)); g.drawString("长度:"+length,100,33); g.drawString("成绩:"+score,670,33); //画小蛇 if (direction.equals("R")){ MyData.right.paintIcon(this,g,snakeX[0],snakeY[0]); }else if (direction.equals("L")){ MyData.left.paintIcon(this,g,snakeX[0],snakeY[0]); }else if (direction.equals("U")){ MyData.up.paintIcon(this,g,snakeX[0],snakeY[0]); }else { MyData.down.paintIcon(this,g,snakeX[0],snakeY[0]); } for (int i = 1; i < length; i++) { MyData.body.paintIcon(this,g,snakeX[i],snakeY[i]); } if (isStart==false){ g.setColor(Color.white); g.setFont(new Font("微软雅黑",Font.BOLD,40)); g.drawString("按下空格开始游戏！",300,380); } if (isFail==true){ g.setColor(Color.red); g.setFont(new Font("微软雅黑",Font.BOLD,40)); g.drawString("失败！按下空格重新开始游戏！",200,380); } } //键盘监听事件 @Override public void keyPressed(KeyEvent e) { int keyCode = e.getKeyCode(); //获得键盘按键是哪一个 if (keyCode == KeyEvent.VK_SPACE){ //空格键 if (isFail){ isFail=false; init(); }else { isStart = !isStart; //取反 } repaint(); //重新绘制 } if (keyCode == KeyEvent.VK_UP){ direction = "U"; }else if (keyCode == KeyEvent.VK_DOWN){ direction = "D"; }else if (keyCode == KeyEvent.VK_LEFT){ direction = "L"; }else if (keyCode == KeyEvent.VK_RIGHT){ direction = "R"; } } //事件监听--需要固定的时间来刷新 @Override public void actionPerformed(ActionEvent e) { if (isStart && isFail==false){ //吃食物 if (snakeX[0] == foodX && snakeY[0] == foodY){ length++; score = score+10; //吃一个分数加10 foodX = 25+25*random.nextInt(34); //25的初始值+随机25个宽，最多只能是34个25宽 foodY = 25+25*random.nextInt(30); //25的初始值+随机25个高，最多只能是30个25宽 } //身体移动 for (int i = length-1; i > 0; i--) { //后一节变到前一节的位置 snakeX[i] = snakeX[i-1]; snakeY[i] = snakeY[i-1]; } //蛇头移动 if (direction.equals("R")){ snakeX[0] = snakeX[0]+25; }else if (direction.equals("L")){ snakeX[0] = snakeX[0]-25; }else if (direction.equals("U")){ snakeY[0] = snakeY[0]-25; }else if (direction.equals("D")){ snakeY[0] = snakeY[0]+25; } //边界判断 if (snakeX[0] > 850){ isFail = true; }else if (snakeX[0] < 25){ isFail = true; } if (snakeY[0] > 775){ isFail = true; }else if (snakeY[0] < 50){ isFail = true; } //失败判断 for (int i = 1; i < length; i++) { if (snakeX[0] == snakeX[i] && snakeY[0] == snakeY[i]){ isFail = true; } } repaint(); } timer.start(); //定时器开启 } @Override public void keyTyped(KeyEvent e) {} @Override public void keyReleased(KeyEvent e) {} } /** * 游戏入口 */ public class StartGame { public static void main(String[] args) { JFrame jFrame = new JFrame(); GamePanel gamePanel = new GamePanel(); jFrame.setTitle("小小贪吃蛇"); jFrame.add(gamePanel); jFrame.setResizable(false); jFrame.setBounds(0,0,900,850); jFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); jFrame.setVisible(true); } }