最终效果:
图片素材:
步骤:
1.Data 初始化需要的图片
2.StartGame 主要实现窗口的加载，和添加GamePanel面板到窗口。
3.GamePanel 最重要的实现部分，包括：
3.1 定义需要的数据
3.2 绘制图像
3.3 实现事件监听
Data.java (加载图片使用)
package snake;
import javax.swing.*;
import java.net.URL;
//数据中心
public class Data {
public static URL headerURL=Data.class.getResource("statics/header.png");
public static ImageIcon header=new ImageIcon(headerURL);
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 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 URL bodyURL=Data.class.getResource("statics/body.png");
public static ImageIcon body=new ImageIcon(bodyURL);
public static URL foodURL=Data.class.getResource("statics/food.png");
public static ImageIcon food=new ImageIcon(foodURL);
}
StartGame.java （加载窗口和添加游戏面板)
package snake;
import javax.swing.*;
public class StartGame {
public StartGame() {
//simple Frame
JFrame frame = new JFrame("开始界面");
frame.setBounds(100, 100, 900, 720);
frame.setResizable(false);//窗口大小不能改变，不然游戏变形
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.setVisible(true);
//一般的游戏都会放到面板上,
frame.add(new GamePanel());
}
public static void main(String[] args) {
new StartGame();
}
}
GamePanel.java (主要的实现类，数据，画图，事件帧）
package snake;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.util.Random;
/**
* 游戏的面板
* //绘制面板，游戏中所有的东西都可用这个东西来画
*/
public class GamePanel extends JPanel implements ActionListener {
/**
* 一、定义数据：
*/
int length;
int[] snakeX = new int[600];//定义snake的x坐标
int[] snakeY = new int[600];//定义蛇的Y坐标
String direction;//方向
boolean isStart;//暂停效果
//定时器 100ms
Timer timmer = new Timer(100, this);
//食物的坐标
int foodX;
int foodY;
Random random = new Random();
boolean isFail = false; //判断死亡
int score;//累计分数
/**
* 构造方法.
* 三、事件监听和键盘监听
* 的键盘监听.
*/
public GamePanel() {
init();//构造器里面调用init（）方法。
//给Panel添加键盘监听
this.setFocusable(true);
this.addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
System.out.println(e.getKeyChar());
if (e.getKeyCode() == KeyEvent.VK_SPACE) {//注意!我这里用Tab+空格才可以运行
isStart = !isStart;//暂停效果，取反
if (isFail) {
isFail = false;
}
repaint();//刷新
}
//小蛇头的图片的转化
if (e.getKeyCode() == KeyEvent.VK_UP) {
direction = "up";
} else if (e.getKeyCode() == KeyEvent.VK_DOWN) {
direction = "down";
} else if (e.getKeyCode() == KeyEvent.VK_LEFT) {
direction = "left";
} else if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
direction = "right";
}
}
});
//给panel 添加定时器,
/*
新建一个线程，然后让他在while里循环，通过Thread.sleep(100)的方法来休眠线程。
*/
timmer.start();//游戏一开始定时器就启动
}
//初始化数据
public void init() {
length = 3;
snakeX[0] = 100;
snakeY[0] = 100;//第一个头header的坐标
snakeX[1] = 75;
snakeY[1] = 100;//第2 body的坐标
snakeX[2] = 50;
snakeY[2] = 100;//第3 body的坐标
direction = "right";
isStart = false;
foodX = 25 + random.nextInt(34) * 25;
foodY = 75 + random.nextInt(24) * 25;
}
/**
* 二、绘制图形
*
* @param g
*/
@Override
public void paint(Graphics g) {
Data.header.paintIcon(this, g, 25, 11);//广告栏
g.fillRect(25, 75, 850, 600);//矩形面板。
this.setVisible(true);
this.setBackground(new Color(139, 168, 20));
//小蛇的头图片转化
if (direction == "right") {
Data.right.paintIcon(this, g, snakeX[0], snakeY[0]);
} else if (direction == "left") {
Data.left.paintIcon(this, g, snakeX[0], snakeY[0]);
} else if (direction == "up") {
Data.up.paintIcon(this, g, snakeX[0], snakeY[0]);
} else if (direction == "down") {
Data.down.paintIcon(this, g, snakeX[0], snakeY[0]);
}
//把小蛇body画上去,使用的组件，画笔，x,y 位置。
for (int i = 1; i < length; i++) {
Data.body.paintIcon(this, g, snakeX[i], snakeY[i]);
}
if (isStart == false) {
g.setColor(new Color(255, 255, 255));
g.setFont(new Font("微软雅黑", Font.BOLD, 40));
g.drawString("按下空格开始游戏", 300, 300);
}
//把食物画上去
Data.food.paintIcon(this, g, foodX, foodY);
//把 isFail的面板画上去,并得出分数
if (isFail) {
g.setColor(new Color(195, 68, 106));
g.setFont(new Font("微软雅黑", Font.BOLD, 80));
g.drawString("GAME OVER ", 200, 180);
g.setFont(new Font("微软雅黑", Font.BOLD, 40));
g.drawString("YOUR SCORE IS: " + score, 260, 400);
}
//把积分画上去
g.setColor(new Color(255, 255, 255));
g.setFont(new Font("微软雅黑", Font.CENTER_BASELINE, 18));
g.drawString("SCORE:" + score, 750, 35);
g.drawString("LENGTH:" + length, 750, 50);
}
/**
* 三、添加事件监听或者键盘监听：
*
* @param e
*/
@Override
public void actionPerformed(ActionEvent e) {
if (isStart) {
//小蛇body移动到靠头的一个body
//小蛇右移动--2，3重叠为什么？
// for (int i = 1; i <= length; i++) {
// middle = snakeX[i - 1];
// snakeX[i] = middle;
// }
//身体跟进
for (int i = length - 1; i > 0; i--) {
snakeX[i] = snakeX[i - 1];
snakeY[i] = snakeY[i - 1];
}
//头的移动
if (direction == "right") {
snakeX[0] += 25;
snakeY[0] += 0;
if (snakeX[0] > 850) {
snakeX[0] = 25;
}
} else if (direction == "left") {
snakeX[0] -= 25;
snakeY[0] += 0;
if (snakeX[0] <= 25) {
snakeX[0] = 850;
}
} else if (direction == "up") {
snakeX[0] += 0;
snakeY[0] -= 25;
if (snakeY[0] <= 50) {
snakeY[0] = 650;
}
} else if (direction == "down") {
snakeX[0] += 0;
snakeY[0] += 25;
if (snakeY[0] >= 650) {
snakeY[0] = 50;
}
}
//吃食物
if (snakeX[0] == foodX && snakeY[0] == foodY) {
length++;//长度+1
score = length * 10 - 30;//分数改变
//初始化 食物坐标
foodX = 25 + random.nextInt(34) * 25;
foodY = 75 + random.nextInt(24) * 25;
}
//判断是否isFail死亡
for (int i = 1; i < length; i++) {
if (snakeX[i] == snakeX[0] && snakeY[i] == snakeY[0]) {
isFail = true;
isStart = false;
}
}
repaint();//repaint()
}
//定时器开始
timmer.start();
}
}
