A small snake game developed by Java
1. Game instructions
Control the greedy snake to move up, down, left, and right. Space bar to pause or start the game. Blue food scores 10 points, yellow food scores 20 points, and red food scores 30 points. The movement speed of the snake will increase with the increase in length, the fastest is twice the initial speed, here you can customize the settings in the code. There is still a bug that has not yet been resolved, that is, the snake can go back. The theory is that it should turn around in one direction but not directly go in the opposite direction. By default, it will bite itself until the game is over. This problem will be fixed in the future.
Two, the program code
1. StartGame.java (main function class)
Some parameters used to set the window
package com.java.snake;
import javax.swing.*;
public class StartGame {
public static void main(String[] args) {
// 1.绘制一个静态窗口并设置窗口标题
JFrame jFrame = new JFrame("贪吃蛇小游戏");
jFrame.setBounds(10, 10, 900, 720); // 设置起始坐标和窗口大小
jFrame.setResizable(false); // 设置不可以调整窗口大小
jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 设置可以关闭窗口
// 2.绘制面板
jFrame.add(new GamePanel());
jFrame.setVisible(true); // 让窗口可以展现出来
}
}
2、GamePanel.java
This class is the main code of the program, including drawing and setting the number of frames as well as keyboard monitoring
package com.java.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 length; // 蛇的长度
String fx; // 方向 R：右 L：左 U：上 D：下
int[] snakeX = new int[600]; // 蛇的X轴坐标
int[] snakeY = new int[500]; // 蛇的Y轴坐标
boolean isStart; // 游戏是否开始的表示，默认未开始
boolean isFail; // 是否失败标识
int score; // 分数
int num; // 食物颜色编号
int foodX;
int foodY;
Random random = new Random();
int seconds = 100;
Timer timer = new Timer(seconds, this); // 设置一个定时器
// 构造器
public GamePanel() {
init();
// 获取键盘监听时间
this.setFocusable(true);
this.addKeyListener(this);
timer.start(); // 让时间动起来
}
public void init() {
length = 3; // 初始化蛇长度为3
fx = "R"; // 初始化蛇头方向是往右
// 头部坐标
snakeX[0] = 100;
snakeY[0] = 100;
snakeX[1] = 75;
snakeY[1] = 100;
snakeX[2] = 50;
snakeY[2] = 100;
isStart = false;
isFail = false;
// 随机初始化食物
foodX = 25 + 25 * random.nextInt(34);
foodY = 75 + 25 * random.nextInt(24);
score = 0; // 默认分数为0
seconds = 100;
}
// 面板：画界面 画蛇
// Graphics：画笔
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
this.setBackground(Color.white); // 设置背景颜色
Data.header.paintIcon(this, g, 25, 11); // 绘制游戏头部图片
g.fillRect(25, 75, 850, 600); // 绘制游戏区域
// 画一条静态的小蛇
if ("R".equals(fx))
Data.right.paintIcon(this, g, snakeX[0], snakeY[0]);
if ("L".equals(fx))
Data.left.paintIcon(this, g, snakeX[0], snakeY[0]);
if ("U".equals(fx))
Data.up.paintIcon(this, g, snakeX[0], snakeY[0]);
if ("D".equals(fx))
Data.down.paintIcon(this, g, snakeX[0], snakeY[0]);
// 蛇的长度用length进行控制
for (int i = 1; i < length; i++) {
Data.body.paintIcon(this, g, snakeX[i], snakeY[i]);
}
if (num == 0)
Data.foodBlue.paintIcon(this, g, foodX, foodY);
if (num == 1)
Data.foodYellow.paintIcon(this, g, foodX, foodY);
if (num == 2)
Data.foodRed.paintIcon(this, g, foodX, foodY);
// 游戏未开始时话一个字符串
if (!isStart) {
g.setColor(Color.white); // 设置画笔颜色
g.setFont(new Font("微软雅黑", Font.BOLD, 40)); // 设置字体
g.drawString("按下空格开始游戏", 300, 300);
}
// 游戏未开始时话一个字符串
if (!isStart) {
g.setColor(Color.white); // 设置画笔颜色
g.setFont(new Font("微软雅黑", Font.BOLD, 40)); // 设置字体
g.drawString("按下空格开始游戏", 300, 300);
}
// 游戏失败时话一个字符串
if (isFail) {
g.setColor(Color.red); // 设置画笔颜色
g.setFont(new Font("微软雅黑", Font.BOLD, 40)); // 设置字体
g.drawString("游戏结束，按下空格重新开始游戏", 150, 300);
}
g.setColor(Color.white);
g.setFont(new Font("微软雅黑", Font.BOLD, 18));
g.drawString("长度：" + length, 750, 35);
g.drawString("分数：" + score, 750, 55);
}
// 定时器，监听时间，帧：执行定时操作
@Override
public void actionPerformed(ActionEvent e) {
// 如果游戏处于开始状态并且游戏没有结束
if (isStart && !isFail) {
// 右移动
for (int i = length - 1; i > 0; i--) {
snakeX[i] = snakeX[i - 1];
snakeY[i] = snakeY[i - 1];
}
// 通过控制方向让小蛇移动
if ("U".equals(fx)) {
// 头部移动
snakeY[0] -= 25;
// 边界判断
if (snakeY[0] < 75) {
snakeY[0] = 650;
}
} else if ("D".equals(fx)) {
// 头部移动
snakeY[0] += 25;
// 边界判断
if (snakeY[0] > 650) {
snakeY[0] = 75;
}
} else if ("R".equals(fx)) {
// 头部移动
snakeX[0] += 25;
// 边界判断
if (snakeX[0] > 850) {
snakeX[0] = 25;
}
} else if ("L".equals(fx)) {
// 头部移动
snakeX[0] -= 25;
// 边界判断
if (snakeX[0] < 25) {
snakeX[0] = 850;
}
}
if (snakeX[0] == foodX && snakeY[0] == foodY) {
// 长度加一
length++;
// 增加分数
if (num == 0)
score += 10;
if (num == 1)
score += 20;
if (num == 2)
score += 30;
// 帧数加时
if (seconds > 50) {
timer.setDelay(seconds -= 1);
}
// 重新随机生成一个颜色食物
foodX = 25 + 25 * random.nextInt(34);
foodY = 75 + 25 * random.nextInt(24);
num = random.nextInt(3);
}
// 失败判定
for (int i = 1; i < length; i++) {
if (snakeX[0] == snakeX[i] && snakeY[0] == snakeY[i]) {
isFail = true;
break;
}
}
// 刷新界面
repaint();
}
//
timer.start(); // 让时间动起来
}
@Override
public void keyPressed(KeyEvent e) {
// 键盘按下未释放
int keyCode = e.getKeyCode();
// 如果按下的是空格
if (keyCode == KeyEvent.VK_SPACE) {
if (isFail) {
// 重新开始游戏
init();
isStart = true;
} else {
// 游戏开始或者暂停
isStart = !isStart;
}
// 刷新界面
repaint();
}
if (keyCode == KeyEvent.VK_UP) {
fx = "U";
} else if (keyCode == KeyEvent.VK_DOWN) {
fx = "D";
} else if (keyCode == KeyEvent.VK_RIGHT) {
fx = "R";
} else if (keyCode == KeyEvent.VK_LEFT) {
fx = "L";
}
}
@Override
public void keyReleased(KeyEvent e) {
// 键盘释放
}
@Override
public void keyTyped(KeyEvent e) {
// 键盘按下并释放 敲击
}
}
3、Data.java
This class writes some data. Import some external picture materials and draw them on the panel in GamePanel.java
package com.java.snake;
import javax.swing.*;
import java.net.URL;
// 存放外部数据
public class Data {
// 游戏头部的图片
public static URL headerUrl = Data.class.getResource("/static/header.png");
public static ImageIcon header = new ImageIcon(headerUrl);
// 导入一些图片素材
public static URL upUrl = Data.class.getResource("/static/up.png");
public static URL downUrl = Data.class.getResource("/static/down.png");
public static URL leftUrl = Data.class.getResource("/static/left.png");
public static URL rightUrl = Data.class.getResource("/static/right.png");
public static URL bodyUrl = Data.class.getResource("/static/body.png");
public static ImageIcon up = new ImageIcon(upUrl); // 上
public static ImageIcon down = new ImageIcon(downUrl); // 下
public static ImageIcon left = new ImageIcon(leftUrl); // 左
public static ImageIcon right = new ImageIcon(rightUrl); // 右
public static ImageIcon body = new ImageIcon(bodyUrl); // 身体
// 食物
public static URL foodBlueUrl = Data.class.getResource("/static/food_blue.png");
public static URL foodYellowUrl = Data.class.getResource("/static/food_yellow.png");
public static URL foodRedUrl = Data.class.getResource("/static/food_red.png");
public static ImageIcon foodBlue = new ImageIcon(foodBlueUrl); // 蓝色食物，加一个长度
public static ImageIcon foodYellow = new ImageIcon(foodYellowUrl); // 黄色食物，加两个长度
public static ImageIcon foodRed = new ImageIcon(foodRedUrl); // 红色食物，加三个长度
}