20260508(2)

重写一下那个联机射击的网页小游戏吧，这次逻辑和运算都要写在后端。
今晚只完成了一小部分后端,前端还没开始写：

app.js

const express = require('express');
const WebSocket = require('ws');
const cors = require('cors');
const app = express();

app.use(express.json());
app.use(cors());

const server = app.listen(5000, () => {
    console.log('服务器运行在 http://localhost:5000');
});

const wss = new WebSocket.Server({server});

let players = []
let bullets = []

let config = {
    FPS: 1000 / 60,
    shootGap: 1000,
}

wss.on('connection', ws => {
    console.log('有玩家连接服务器');

    ws.on('message', message => {

        const msg = JSON.parse(message);
        const type = msg.type;
        const data = msg.data;

        const tsp = Date.now();
        let index;
        switch (type) {
            //玩家加入
            case 'pJoin':
                players.push(new Player(data))
                console.log(data.name + " 加入游戏")
                break;
            //玩家移动
            case 'pMove':
                index = players.findIndex(player => player.id === data.id)
                if (index > -1) {
                    players[index].up = data.up;
                    players[index].down = data.down;
                    players[index].left = data.left;
                    players[index].right = data.right;
                }
                break;
            //玩家射击
            case 'pShoot':
                index = players.findIndex(player => player.id === data.id)
                if ((index > -1) && (tsp - players[index].latestShoot > config.shootGap)) {
                    //新建子弹
                    bullets.push(new Bullet({
                        id: bullets.length,
                        from: players[index].name,
                        color: players[index].color,
                        at: players[index].at,
                        x: players[index].x,
                        y: players[index].y,
                        w: 10,
                        h: 10,
                        a: 0,
                        v: 5,
                        angle: players[index].angle
                    }));
                }
                break;
            //玩家死亡
            case 'pDelete':
                index = players.findIndex(player => player.id === data.id)
                if (index > -1) {
                    players.splice(index, 1)
                    console.log(data.name + " 离开游戏")
                }
                break;
        }
    })
})
//广播定时器
setInterval(() => {
    players.forEach(player => {
        //更新玩家位置
        player.playerMove();
    })
    bullets.forEach(bullet => {
        //更新子弹位置
        bullet.bulletMove();
    })
    //碰撞检测

    //广播位置

}, config.FPS)

//玩家类
class Player {
    constructor({
                    name,
                    id,
                    color,
                    maxHp,
                    hp,
                    at,
                    latestShoot,
                    latestHurt,
                    x,
                    y,
                    w,
                    h,
                    a,
                    v,
                    up,
                    down,
                    left,
                    right,
                    angle
                }) {
        this.name = name;
        this.id = id;
        this.color = color;
        this.maxHp = maxHp;
        this.hp = hp;
        this.at = at;
        this.latestShoot = latestShoot;
        this.latestHurt = latestHurt;
        this.x = x;
        this.y = y;
        this.w = w;
        this.h = h;
        this.a = a;
        this.v = v;
        this.up = up;
        this.down = down;
        this.left = left;
        this.right = right;
        this.angle = angle;
    }

    playerMove() {
        if (this.up) {
            this.y -= this.v;
        }
        if (this.down) {
            this.y += this.v;
        }
        if (this.left) {
            this.x -= this.v;
        }
        if (this.right) {
            this.x += this.v;
        }
    }
}

//子弹类
class Bullet {
    constructor({id, from, color, at, x, y, w, h, a, v, angle}) {
        this.id = id;
        this.from = from;
        this.color = color;
        this.at = at;
        this.x = x;
        this.y = y;
        this.w = w;
        this.h = h;
        this.a = a;
        this.v = v;
        this.angle = angle;
    }

    bulletMove() {
        const rad = (this.angle * Math.PI) / 180;
        this.x += Math.cos(rad) * this.v;
        this.y += Math.sin(rad) * this.v;
    }
}