Java——贪吃蛇小游戏的实现
1. 程序结构
程序结构图如图:
2. 程序设计思路
2.1 Data类
作用:连接statics文件夹,将静态资源包中的图片转化为图标 方便在面板上绘制。
实现:使用class.getResource(String path)方法。
代码如下:
- package com.snake;
- import javax.swing.*;
- import java.net.URL;
- public class Data {
- //贪吃蛇头部
- public static URL upUrl = Data.class.getResource("/statics/up.png");
- public static ImageIcon up = new ImageIcon(upUrl);
- public static URL downUrl = Data.class.getResource("/statics/down.png");
- public static ImageIcon down = new ImageIcon(downUrl);
- public static URL leftUrl = Data.class.getResource("/statics/left.png");
- public static ImageIcon left = new ImageIcon(leftUrl);
- public static URL rightUrl = Data.class.getResource("/statics/right.png");
- public static ImageIcon right = new ImageIcon(rightUrl);
- //贪食蛇身体
- public static URL bodyUrl = Data.class.getResource("/statics/body.png");
- public static ImageIcon body = new ImageIcon(bodyUrl);
- //食物
- public static URL foodUrl = Data.class.getResource("/statics/food.png");
- public static ImageIcon food = new ImageIcon(foodUrl);
- }
复制代码 2.2 StartGame类- 作用:创建游戏窗口,在窗口中添加一个游戏面板。
- 实现:使用JFrame类创建游戏窗口,利用其add()方法添加一个GamePanel类实例化对象。
代码如下: - package com.snake;
- import javax.swing.*;
- import java.awt.*;
- public class StartGame {
- public static void main(String[] args){
- //建立游戏窗口
- JFrame frame = new JFrame("Java-贪吃蛇小游戏");//标题
- frame.setSize(900,720);//窗口大小
- frame.setLocationRelativeTo(null);//窗口显示屏幕中间
- frame.setResizable(false);//固定窗口大小
- frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置窗体关闭事件
- frame.add(new GamePanel());//添加游戏内容
- frame.setVisible(true);//设置窗体可见
- }
- }
复制代码2.3 GamePanel类 作用:实现游戏的动态页面。 实现:(1)init()方法:初始化小蛇位置; (2)eat()方法:用随机种子随机食物的位置,并进行判定,食物位置不能和小蛇位置重合; (3)继承JPanel类,重写paintComponent(Graphics g)方法,在方法中绘制标题栏、小蛇的位置(根据direction小蛇头部方向变量绘制小蛇头部)、小蛇身体、积分栏、游戏提醒项与失败判断项; (4)实现KeyListener 接口中的keyPressed(KeyEvent e)方法,获取键盘输入,根据键盘输入对游戏状态或者小蛇头部方向direction变量进行更改; (5)实现ActionListener接口中的actionPerformed(ActionEvent e)方法,根据游戏状态和direction变量进行小蛇移动操作(注意禁用直接回头操作),进行吃食物判定和死亡判定。使用Timer计时器让游戏动态变化,用repaint()方法实时更新界面。 代码如下: - package com.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[] snakeX = new int[500];//贪吃蛇横坐标
- int[] snakeY = new int[500];//贪吃蛇纵坐标
- int foodX;//食物横坐标
- int foodY;//食物蛇纵坐标
- int length;//贪吃蛇的长度
- String direction;//贪吃蛇头方向
- int score;//积分
- Random r = new Random();
- Timer timer = new Timer(100,this);
- boolean isStart;
- boolean isFail;
- //构造函数
- public GamePanel(){
- init();
- this.setFocusable(true);
- this.addKeyListener(this);
- timer.start();
- }
- private void init(){
- length=3;
- snakeX[0]=100;snakeY[0]=100;
- snakeX[1]=75;snakeY[1]=100;
- snakeX[2]=50;snakeY[2]=100;
- direction = "R";
- eat(foodX,foodY);
- isStart = false;
- isFail = false;
- score = 0;
- }
- private void eat(int x,int y){
- x= 25 + 25*r.nextInt(34);
- y= 75 + 25*r.nextInt(24);
- for (int i = 0; i < length; i++) {
- if(snakeX[i]==x&&snakeY[i]==y){
- x = 25 + 25*r.nextInt(34);
- y = 75 + 25*r.nextInt(24);
- }
- }
- foodX = x;foodY = y;
- }
- protected void paintComponent(Graphics g) {
- super.paintComponent(g);
- this.setBackground(Color.white);//设置背景板为白色
- //画标题
- g.setColor(Color.GREEN);
- g.setFont(new Font("幼圆",Font.BOLD,50));
- g.drawString("贪吃蛇游戏",300,60);
- //绘制游戏区域
- g.setColor(Color.GRAY);
- g.fillRect(25,75,850,600);
- //画贪吃蛇头部
- if(direction=="R"){
- Data.right.paintIcon(this,g,snakeX[0],snakeY[0]);
- }
- else if(direction=="L"){
- Data.left.paintIcon(this,g,snakeX[0],snakeY[0]);
- }
- if(direction=="U"){
- Data.up.paintIcon(this,g,snakeX[0],snakeY[0]);
- }
- else if(direction=="D"){
- Data.down.paintIcon(this,g,snakeX[0],snakeY[0]);
- }
- //画身体
- for (int i = 1; i < length ; i++) {
- Data.body.paintIcon(this,g,snakeX[i],snakeY[i]);
- }
- //画食物
- Data.food.paintIcon(this,g,foodX,foodY);
- //绘制积分栏
- g.setColor(Color.BLACK);
- g.setFont(new Font("幼圆",Font.BOLD,20));
- g.drawString("长度:"+length,730,30);
- g.drawString("得分:"+score,730,60);
- //游戏开始提醒
- if(isStart==false){
- g.setColor(Color.BLACK);
- g.setFont(new Font("幼圆",Font.BOLD,40));
- g.drawString("按空格键开始游戏",300,300);
- }
- //失败判断
- if(isFail){
- g.setColor(Color.RED);
- g.setFont(new Font("幼圆",Font.BOLD,40));
- g.drawString("游戏失败,按空格键重新开始",300,300);
- }
- }
- @Override
- public void keyPressed(KeyEvent e) {
- int keyCode = e.getKeyCode();//获取按下的按键
- //判断空格
- if(keyCode==KeyEvent.VK_SPACE){
- if(isFail){
- isFail = false;
- init();
- }
- else{
- isStart = !isStart;
- }
- repaint();
- }
- //判断方向
- if(keyCode==KeyEvent.VK_LEFT&&direction!="R"){
- direction = "L";
- }
- else if(keyCode==KeyEvent.VK_RIGHT&&direction!="L"){
- direction = "R";
- }
- else if(keyCode==KeyEvent.VK_UP&&direction!="D"){
- direction = "U";
- }
- else if(keyCode==KeyEvent.VK_DOWN&&direction!="U"){
- direction = "D";
- }
- }
- @Override
- public void keyReleased(KeyEvent e) {
- }
- @Override
- public void keyTyped(KeyEvent e) {
- }
- @Override
- public void actionPerformed(ActionEvent e) {
- //判断游戏状态
- if(isStart&&!isFail){
- //移动身体
- for (int i = length-1; i > 0 ; i--) {
- snakeX[i] = snakeX[i-1];
- snakeY[i] = snakeY[i-1];
- }
- //移动头部
- if(direction=="R"){
- snakeX[0] += 25;
- if(snakeX[0]>850){
- snakeX[0] = 25;
- }
- }
- else if(direction=="L"){
- snakeX[0] -= 25;
- if(snakeX[0]<25){
- snakeX[0] = 850;
- }
- }
- else if(direction=="U"){
- snakeY[0] -= 25;
- if(snakeY[0]<75){
- snakeY[0] = 650;
- }
- }
- else if(direction=="D"){
- snakeY[0] += 25;
- if(snakeY[0]>650){
- snakeY[0] = 75;
- }
- }
- //吃食物
- if(snakeX[0]==foodX&&snakeY[0]==foodY){
- length++;
- score += 10;
- eat(foodX,foodY);
- }
- //死亡判定
- for (int i = 1; i < length; i++) {
- if(snakeX[0]==snakeX[i]&&snakeY[0]==snakeY[i]){
- isFail=true;
- }
- }
- repaint();
- }
- timer.start();
- }
- }
复制代码
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