1. Project Overview
The Snake game is a very popular little game. The task of the entire game is very simple, which is to control the movement direction of the snake up, down, left, and right (control mechanism), and eat the food that appears on the screen without hitting the wall or yourself (failure mechanism). The longer it becomes, the higher the score you get (reward mechanism).
2. Project design:
- Draw a game interface
- Demarcate the game area on the interface
- Draw food and snakes in the play area
3. Project implementation and result analysis
Test class
public class Test {
public static void main(String[] args) {
Snake snake = new Snake();
snake.myJFrame();
}
}
Snake class
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Random;
public class Snake extends JFrame implements KeyListener, ActionListener, MouseListener {
int slong = 2;//蛇当前长度
//蛇坐标
int[] Snakex = new int[100];
int[] Snakey = new int[100];
int fx = 1;//蛇的方向 0-左 1-右 2-上 3-下
Timer timer = new Timer(100, this);//设置定时器，每100毫秒一次
//食物位置
int foodx;
int foody;
Random random = new Random();//随机数，随机位置生成食物
int started = 0;//游戏信息 0-未开始 1-开始 2-结束
//---------------------------------------------------------------------------------------------------------------------
//窗体
public void myJFrame() {
this.setTitle("贪吃蛇"); //标题
this.setSize(800, 600); //窗口大小
this.setResizable(false); //窗口是否可以改变大小=否
this.setDefaultCloseOperation(Snake.EXIT_ON_CLOSE); //窗口关闭方式为关闭窗口同时结束程序
int width = Toolkit.getDefaultToolkit().getScreenSize().width; //获取屏幕宽度
int height = Toolkit.getDefaultToolkit().getScreenSize().height; //获取屏幕高度
// System.out.println("宽度："+width);//测试
// System.out.println("高度："+height);//测试
this.setLocation((width - 800) / 2, (height - 600) / 2); //设置窗口默认位置以屏幕居中
this.setFocusable(true);
this.addKeyListener(this);
this.setVisible(true); //窗口是否显示=是
// 蛇的初识位置
Snakex[0] = 60;
Snakey[0] = 100;
Snakex[1] = 40;
Snakey[1] = 100;
// 随机食物的初识位置
foodx = random.nextInt(39);
foody = random.nextInt(22);
foodx = foodx * 20;
foody = foody * 20 + 80;
System.out.println(foodx + "，" + foody);
}
//---------------------------------------------------------------------------------------------------------------------
//覆写paint方法,绘制界面
public void paint(Graphics g) {
// 绘制背景
g.setColor(Color.LIGHT_GRAY);
g.fillRect(0, 0, 800, 600);
//绘制游戏区域
g.setColor(Color.black);
g.fillRect(0, 80, 800, 520);
//绘制蛇
for (int i = 0; i < slong; i++) {
g.setColor(Color.CYAN);
g.fillRect(Snakex[i], Snakey[i], 20, 20);
}
// 绘制食物
g.setColor(Color.yellow);
g.fillOval(foodx, foody, 20, 20);
if (started == 0) {
g.setColor(Color.BLACK);//设置画笔颜色
g.setFont(new Font("微软雅黑", 10, 20)); //设置字体
g.drawString("按下“空格键”开始游戏", 300, 65); //绘制字符
} else if (started == 1) {
g.setColor(Color.BLACK);//设置画笔颜色
g.setFont(new Font("微软雅黑", 10, 20)); //设置字体
g.drawString("当前分数为：", 300, 65); //绘制字符
g.drawString(String.valueOf(slong - 2), 420, 65); //绘制字符
} else if (started == 2) {
g.setColor(Color.BLACK);//设置画笔颜色
g.setFont(new Font("微软雅黑", 10, 20)); //设置字体
g.drawString("游戏结束-", 250, 65); //绘制字符
g.drawString("最终分数为：", 350, 65); //绘制字符
g.drawString(String.valueOf(slong - 2), 470, 65); //绘制字符
}
}
// 操作监听——控制蛇的不断移动
@Override
public void actionPerformed(ActionEvent e) {
// 判断游戏是否开始
if (started == 1) {
// 通过循环控制蛇移动
for (int i = slong - 1; i > 0; i--) {
Snakex[i] = Snakex[i - 1];
Snakey[i] = Snakey[i - 1];
}
// 判断蛇移动的方向
if (fx == 0) {
Snakex[0] = Snakex[0] - 20;
} else if (fx == 1) {
Snakex[0] = Snakex[0] + 20;
} else if (fx == 2) {
Snakey[0] = Snakey[0] - 20;
} else if (fx == 3) {
Snakey[0] = Snakey[0] + 20;
}
// 判断蛇是否撞到墙外
if (Snakex[0] < 0 || Snakex[0] > 780 || Snakey[0] < 80 || Snakey[0] > 580) {
started = 2;
}
// 判断蛇是否吃到了食物
if (Snakex[0] == foodx && Snakey[0] == foody) {
slong++;
foodx = random.nextInt(39);
foody = random.nextInt(22);
foodx = foodx * 20;
foody = foody * 20 + 80;
System.out.println(foodx + "，" + foody);
}
// 判断是否吃到了自己
for (int i = 1; i < slong; i++) {
if (Snakex[0] == Snakex[i] && Snakey[0] == Snakey[i]) {
started = 2;
}
}
// 判断食物是否随机在了蛇身上
for (int i = 0; i < slong; i++) {
if (foodx == Snakex[i] && foody == Snakey[i]) {
// 随机食物的初识位置
foodx = random.nextInt(39);
foody = random.nextInt(22);
foodx = foodx * 20;
foody = foody * 20 + 80;
System.out.println(foodx + "，" + foody);
}
}
repaint();
}
timer.start();
}
// 输入
@Override
public void keyTyped(KeyEvent e) {
}
// 键盘按下——控制游戏的开始以及蛇的移动方向
@Override
public void keyPressed(KeyEvent e) {
// 获取从键盘输入的键
int key = e.getKeyCode();
// 判断是否为空格
if (key == KeyEvent.VK_SPACE) {
if (started == 0) {
started = 1;
} else if (started == 1) {
started = 0;
} else if (started == 2) {
started = 0;
slong = 2;//蛇当前长度
// 蛇的初识位置
Snakex[0] = 60;
Snakey[0] = 100;
Snakex[1] = 40;
Snakey[1] = 100;
// 随机食物的初识位置
foodx = random.nextInt(39);
foody = random.nextInt(22);
foodx = foodx * 20;
foody = foody * 20 + 80;
// 初始化方向
fx = 1;
}
repaint();
timer.start();
// 左
} else if (key == KeyEvent.VK_LEFT) {
if (fx != 1) {
fx = 0;
}
// 右
} else if (key == KeyEvent.VK_RIGHT) {
if (fx != 0) {
fx = 1;
}
// 上
} else if (key == KeyEvent.VK_UP) {
if (fx != 3) {
fx = 2;
}
//下
} else if (key == KeyEvent.VK_DOWN) {
if (fx != 2) {
fx = 3;
}
}
}
// 弹起
@Override
public void keyReleased(KeyEvent e) {
}
// 点击
@Override
public void mouseClicked(MouseEvent e) {
}
// 按下
@Override
public void mousePressed(MouseEvent e) {
}
// 抬起
@Override
public void mouseReleased(MouseEvent e) {
}
// 进入
@Override
public void mouseEntered(MouseEvent e) {
}
// 离开
@Override
public void mouseExited(MouseEvent e) {
}
}
4. Summary
- There are still some problems that need to be solved in the initial implementation of Snake (pop-up windows are still displayed when the game is minimized, pop-up windows pop up multiple times, beautifying the graphical interface, code structure needs to be improved, etc.).