package com.qiang.snake;
import javax.swing.*;

//游戲的主啟動(dòng)類
public class StartGame {
 public static void main(String[] args) {

  JFrame frame = new JFrame();
  frame.setResizable(false); //窗口大小不可變
  frame.setBounds(10,10,900,720);

  frame.add(new GamePanel());

  frame.setVisible(true);
  frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
 }
}

package com.qiang.snake;
import javax.swing.*;
import java.net.URL;

//數(shù)據(jù)中心
public class Data {

 public static URL headerURL = Data.class.getResource("/statics/header.png");
 public static URL upURL = Data.class.getResource("/statics/up.png");
 public static URL downURL = Data.class.getResource("/statics/down.png");
 public static URL leftURL = Data.class.getResource("/statics/left.png");
 public static URL rightURL = Data.class.getResource("/statics/right.png");
 public static URL bodyURL = Data.class.getResource("/statics/body.png");
 public static URL foodURL = Data.class.getResource("/statics/food.png");

 public static ImageIcon header = new ImageIcon(headerURL);
 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);
 public static ImageIcon body = new ImageIcon(bodyURL);
 public static ImageIcon food = new ImageIcon(foodURL);
}

package com.qiang.snake;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.Random;

public class GamePanel extends JPanel implements KeyListener, ActionListener {

 int lenth; //蛇的長度
 int[] snakeX = new int[600]; //蛇的坐標(biāo)x
 int[] snakeY = new int[500]; //蛇的坐標(biāo)y
 String fx = "R"; //蛇的方向 ： R:右 L:左 U:上 D:下
 boolean isStart = false; //游戲是否開始
 Timer timer = new Timer(100, this); //定時(shí)器：第一個(gè)參數(shù)，就是定時(shí)執(zhí)行時(shí)間
 //食物
 int foodx;
 int foody;
 Random random = new Random();
 boolean isFail = false; //游戲是否結(jié)束
 int score; //游戲分?jǐn)?shù)！

 //構(gòu)造方法
 public GamePanel(){
  init();//初始化
  this.setFocusable(true); //獲取焦點(diǎn)事件
  this.addKeyListener(this); //鍵盤監(jiān)聽事件
  timer.start();
 }
 //初始化方法
 public void init(){
  lenth = 3;//初始小蛇有三節(jié),包括小腦袋
  //初始化開始的蛇,給蛇定位,
  snakeX[0] = 100; snakeY[0] = 100;
  snakeX[1] = 75; snakeY[1] = 100;
  snakeX[2] = 50; snakeY[2] = 100;

  //初始化食物數(shù)據(jù)
  foodx = 25 + 25* random.nextInt(34);
  foody = 75 + 25* random.nextInt(24);

  score = 0; //初始化游戲分?jǐn)?shù)
 }

 //畫組件
 @Override
 public void paintComponent(Graphics g){
  super.paintComponent(g);//清屏
  this.setBackground(Color.WHITE); //設(shè)置面板的背景色
  Data.header.paintIcon(this,g,25,11); //繪制頭部信息區(qū)域
  g.fillRect(25,75,850,600); //繪制游戲區(qū)域

  //把小蛇畫上去
  if (fx.equals("R")){ //蛇的頭通過方向變量來判斷
   Data.right.paintIcon(this,g,snakeX[0],snakeY[0]);
  }else if (fx.equals("L")){
   Data.left.paintIcon(this,g,snakeX[0],snakeY[0]);
  }else if (fx.equals("U")){
   Data.up.paintIcon(this,g,snakeX[0],snakeY[0]);
  }else if (fx.equals("D")){
   Data.down.paintIcon(this,g,snakeX[0],snakeY[0]);
  }
  for (int i = 1; i < lenth; i++) {
   Data.body.paintIcon(this,g,snakeX[i],snakeY[i]); //蛇的身體長度根據(jù)lenth來控制
  }

  //畫食物
  Data.food.paintIcon(this,g,foodx,foody);

  g.setColor(Color.white);
  g.setFont(new Font("微軟雅黑",Font.BOLD,18));
  g.drawString("長度 " + lenth,750,35);
  g.drawString("分?jǐn)?shù) " + score,750,50);

  //游戲提示
  if (isStart==false){
   g.setColor(Color.white);
   g.setFont(new Font("微軟雅黑",Font.BOLD,40));
   g.drawString("按下空格開始游戲!",300,300);
  }
  //失敗判斷
  if (isFail){
   g.setColor(Color.RED);
   g.setFont(new Font("微軟雅黑",Font.BOLD,40));
   g.drawString("失敗, 按下空格重新開始",200,300);
  }

 }

 @Override
 public void keyTyped(KeyEvent e) {
 }

 //鍵盤監(jiān)聽事件
 @Override
 public void keyPressed(KeyEvent e) {
  int keyCode = e.getKeyCode(); //獲取按下的鍵盤

  if (keyCode==KeyEvent.VK_SPACE){ //如果是空格
   if (isFail){ //如果游戲失敗,從頭再來！
    isFail = false;
    init(); //重新初始化
   }else { //否則，暫停游戲
    isStart = !isStart;
   }
   repaint();
  }

  //鍵盤控制走向
  if (keyCode==KeyEvent.VK_LEFT){
   fx = "L";
  }else if (keyCode==KeyEvent.VK_RIGHT){
   fx = "R";
  }else if (keyCode==KeyEvent.VK_UP){
   fx = "U";
  }else if (keyCode==KeyEvent.VK_DOWN){
   fx = "D";
  }

 }
 @Override
 public void keyReleased(KeyEvent e) {
 }

 //定時(shí)執(zhí)行的操作
 @Override
 public void actionPerformed(ActionEvent e) {
  //如果游戲處于開始狀態(tài)，并且沒有結(jié)束，則小蛇可以移動(dòng)
  if (isStart && isFail==false){
   //右移:即讓后一個(gè)移到前一個(gè)的位置即可 !
   for (int i = lenth-1; i > 0; i--) { //除了腦袋都往前移：身體移動(dòng)
    snakeX[i] = snakeX[i-1]; //即第i節(jié)(后一節(jié))的位置變?yōu)?i-1：前一節(jié))節(jié)的位置！
    snakeY[i] = snakeY[i-1];
   }
   //通過方向控制，頭部移動(dòng)
   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;
   }

   //吃食物:當(dāng)蛇的頭和食物一樣時(shí),算吃到食物!
   if (snakeX[0]==foodx && snakeY[0]==foody){
    //1.長度加一
    lenth++;
    //每吃一個(gè)食物，增加積分
    score = score + 10;
    //2.重新生成食物
    foodx = 25 + 25* random.nextInt(34);
    foody = 75 + 25* random.nextInt(24);
   }

   //結(jié)束判斷，頭和身體撞到了
   for (int i = 1; i < lenth; i++) {
    //如果頭和身體碰撞，那就說明游戲失敗
    if (snakeX[i]==snakeX[0] && snakeY[i]==snakeY[0] ){
     isFail = true;
    }
   }
   repaint(); //需要不斷的更新頁面實(shí)現(xiàn)動(dòng)畫
  }
  timer.start();//讓時(shí)間動(dòng)起來!
 }
}