【狂神说Java】GUI编程入门到游戏实战
https://www.bilibili.com/video/BV1DJ411B75F
init()
paintComponent(Graphics g)
keyPressed(KeyEvent e)
actionPerformed(ActionEvent e)
package com.harbin.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 {
//绘制面板,游戏中所有东西都用这个画笔来画
//定义蛇的数据结构
int length; //长度
int[] snakeX = new int[600];
int[] snakeY = new int[500];
//蛇的方向
String fx;
//食物的坐标
int foodX;
int foodY;
Random random = new Random();
//当前游戏状态,开始 停止
boolean isStart = false;
//游戏失败
boolean isFail = false;
//成绩
int score;
//定时器
Timer timer = new Timer(200,this);
public GamePanel() {
init();
this.setFocusable(true);//获得焦点事件
this.addKeyListener(this);//获得键盘监听事件
timer.start();//游戏开始定时器就启动
}
public void init(){
length = 3;
snakeX[0] = 100;snakeY[0]=100;
snakeX[1] = 75;snakeY[1]=100;
snakeX[2] = 50;snakeY[2]=100;
fx = "R";//初始化方向向右
//食物随机放在屏幕
foodX = 25 + 25*random.nextInt(34);
foodY = 75 + 25*random.nextInt(24);
//初始化成绩
score = 0;
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);//清屏
//绘制静态面板
this.setBackground(Color.WHITE);
//参数(画到哪里:this当前面板,用什么画:画笔参数g,画的位置:x,y)
Data.header.paintIcon(this,g,25,11); //头部广告
g.fillRect(25,75,850,600);//游戏界面
//画积分
g.setColor(Color.WHITE);
g.setFont(new Font("微软雅黑",Font.BOLD,18));
g.drawString("长度"+length,750,30);
g.drawString("分数"+score,750,55);
//画食物
Data.food.paintIcon(this,g,foodX,foodY);
//画蛇头,初始化蛇头向右,需要通过方向判断
if (fx.equals("R")){
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]);
}
//画身体
for (int i = 1; i < length; i++) {
Data.body.paintIcon(this,g,snakeX[i],snakeY[i]);
}
//游戏状态
if (!isStart){
g.setColor(Color.WHITE);
g.setFont(new Font("微软雅黑",Font.BOLD,40));
g.drawString("按下空格开始游戏",300,300);
}
if (isFail){
g.setColor(Color.RED);
g.setFont(new Font("微软雅黑",Font.BOLD,40));
g.drawString("游戏失败,按下空格重新开始",300,300);
}
}
//键盘监听事件
@Override
public void keyPressed(KeyEvent e) {
int keyCode = e.getKeyCode();//获取按下的键
System.out.println(keyCode);
if (keyCode == KeyEvent.VK_SPACE){
//如果按下空格键
if (isFail){
isFail = false;
init();
}else {
isStart = !isStart;
}
repaint();
}
//小蛇移动
if (keyCode == KeyEvent.VK_UP){
fx = "U";
}else if (keyCode == KeyEvent.VK_DOWN){
fx = "D";
}else if (keyCode == KeyEvent.VK_LEFT){
fx = "L";
}else if (keyCode == KeyEvent.VK_RIGHT){
fx = "R";
}
}
//事件监听-通过定时事件刷新
@Override
public void actionPerformed(ActionEvent e) {
if (isStart && !isFail){
//吃食物 头和食物坐标重合
if (snakeX[0] == foodX && snakeY[0] == foodY){
//长度+1
length++;
//分数+10
score += 10;
//再次生成食物
foodX = 25 + 25*random.nextInt(34);
foodY = 75 + 25*random.nextInt(24);
}
//走向
for (int i = length-1; i > 0 ; i--) {
snakeX[i] = snakeX[i-1];
snakeY[i] = snakeY[i-1];
}
//走向
if (fx.equals("R")){
snakeX[0] += 25;
if (snakeX[0] > 850){
snakeX[0] = 25;}//边界判断
}else if (fx.equals("L")){
snakeX[0] -= 25;
if (snakeX[0] < 25){
snakeX[0] = 850;}//边界判断
}else if (fx.equals("U")){
snakeY[0] -= 25;
if (snakeY[0] < 75){
snakeY[0] = 650;}//边界判断
}else if (fx.equals("D")){
snakeY[0] += 25;
if (snakeY[0] > 650){
snakeY[0] = 75;}//边界判断
}
//失败判断,撞到自己就算失败
for (int i = 1; i < length; i++) {
if (snakeX[0] == snakeX[i] && snakeY[0] == snakeY[i]){
isFail=true;}
}
repaint();
}
timer.start();
}
@Override
public void keyTyped(KeyEvent e) {
}
@Override
public void keyReleased(KeyEvent e) {
}
}
游戏启动入口
package com.harbin.snake;
import javax.swing.*;
public class StartGame {
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.setBounds(10,10,900,720);
frame.setResizable(false);
//游戏界面放入画板
frame.add(new GamePanel());
//一定放在下面,否则监听事件无效
frame.setVisible(true);
}
}
将以下文件放进项目目录的statics包下