martijn.diersmann@pm.me
314 lines
10 KiB
JavaScript
314 lines
10 KiB
JavaScript
'use strict';
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/*
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* Turbo Race - spelengine (server-authoritatief)
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* 20 spelers, verticaal scrollende weg, obstakels + power-ups,
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* race max 120s, countdown na host-start.
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*/
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const { EventEmitter } = require('events');
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const crypto = require('crypto');
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const ROAD_W = 420; // wegbreedte in wereld-eenheden (= px)
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const CAR_W = 24; // breedte auto
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const CAR_HALF_X = CAR_W / 2;
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const CAR_HALF_Y = 13; // halve verticale hitbox
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const CRUISE = 300; // kruissnelheid (u/s)
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const BOOST_BONUS = 175; // extra snelheid tijdens boost
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const LATERAL = 165; // laterale stuursnelheid (u/s)
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const STEER_RESPONSE = 7; // hoe snel stuuruitslag inslingert (hoger = directer, lager = vloeiender)
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const OBJ_VH = 12; // verticale halve hoogte van obstakels
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const PICKUP_VH = 14; // verticale halve hoogte van power-ups
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const PICKUP_RADIUS = 16; // horizontale straal power-up
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function clamp(n, lo, hi) { return n < lo ? lo : (n > hi ? hi : n); }
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// Deterministische PRNG zodat de baan eerlijk (identiek) is voor iedereen
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function mulberry32(a) {
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return function () {
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a |= 0; a = (a + 0x6D2B79F5) | 0;
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let t = Math.imul(a ^ (a >>> 15), 1 | a);
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t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t;
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return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
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};
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}
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class Game extends EventEmitter {
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constructor(opts = {}) {
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super();
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this.maxPlayers = opts.maxPlayers || 20;
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this.countdownS = opts.countdownS || 30;
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this.raceDurationS = opts.raceDurationS || 90; // race max 1:30
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this.trackLength = opts.trackLength || 23000; // finish = einde van de baan
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this.players = new Map(); // id -> player
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this.order = []; // aanmeld-volgorde
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this.phase = 'lobby'; // lobby | countdown | race | results
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this.countdownEndsAt = 0;
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this.raceEndsAt = 0;
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this.raceStartedAt = 0;
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this.track = null; // { seed, obstacles[], powerups[] }
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this._idc = 1;
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}
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_randomColor() {
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const hue = Math.floor(Math.random() * 360);
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return `hsl(${hue} 90% 62%)`;
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}
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_newId() { return 'p' + (this._idc++); }
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addPlayer(nameRaw, color, hostToken, adminToken) {
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if (this.players.size >= this.maxPlayers) {
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const e = new Error(`Vol zit: max ${this.maxPlayers} spelers`);
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e.code = 'FULL'; throw e;
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}
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if (this.phase === 'race') {
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const e = new Error('De race is al bezig');
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e.code = 'LATE'; throw e;
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}
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const name = String(nameRaw || '').trim().slice(0, 14) ||
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('Anoniem-' + Math.floor(2 + Math.random() * 98));
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const player = {
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id: this._newId(),
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name,
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color: /^#[0-9a-fA-F]{6}$/.test(String(color)) ? color : this._randomColor(),
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host: !!(hostToken && adminToken && String(hostToken) === String(adminToken)),
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x: clamp(40 + Math.random() * (ROAD_W - 80), CAR_HALF_X, ROAD_W - CAR_HALF_X),
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d: 0,
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speed: 0,
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finished: false,
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finishTime: 0,
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rank: 0,
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boostUntil: 0, shieldUntil: 0, slipUntil: 0, slowUntil: 0,
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steer: 0, steerSm: 0,
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joinedAt: Date.now(),
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};
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this.players.set(player.id, player);
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this.order.push(player.id);
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this.emit('join', player);
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return player;
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}
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removePlayer(id) {
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if (!this.players.delete(id)) return;
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this.order = this.order.filter((x) => x !== id);
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this.emit('leave', id);
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}
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hostStart() {
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if (this.phase !== 'lobby' && this.phase !== 'results') return false;
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this.phase = 'countdown';
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this.countdownEndsAt = Date.now() + this.countdownS * 1000;
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this.emit('countdown');
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return true;
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}
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readyAgain() {
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if (this.phase !== 'results') return false;
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this._resetRaceState();
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this.phase = 'lobby';
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this.emit('lobby_reset');
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return true;
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}
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_resetRaceState() {
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for (const p of this.players.values()) {
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p.x = clamp(40 + Math.random() * (ROAD_W - 80), CAR_HALF_X, ROAD_W - CAR_HALF_X);
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p.d = 0; p.speed = 0; p.finished = false; p.finishTime = 0;
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p.boostUntil = p.shieldUntil = p.slipUntil = p.slowUntil = 0;
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p.steerSm = 0;
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}
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this.track = null;
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}
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update(dtMs) {
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const now = Date.now();
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if (this.phase === 'countdown' && now >= this.countdownEndsAt) {
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this._startRace(now);
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} else if (this.phase === 'race') {
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this._updatePhysics(dtMs / 1000, now);
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const ended = now >= this.raceEndsAt || this._allFinished();
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if (ended) {
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this._rank();
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this.phase = 'results';
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this.emit('results');
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}
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}
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}
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_allFinished() {
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if (this.players.size === 0) return false;
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for (const p of this.players.values()) if (!p.finished) return false;
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return true;
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}
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_startRace(now) {
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this.phase = 'race';
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this.raceStartedAt = now;
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this.raceEndsAt = now + this.raceDurationS * 1000;
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this._generateTrack();
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// Startgrid: posities verdeeld van links naar rechts
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const arr = [...this.players.values()];
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const slots = ROAD_W / (arr.length + 1);
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arr.forEach((p, i) => {
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p.x = slots * (i + 1);
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p.d = 0; p.speed = 0;
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p.finished = false; p.finishTime = 0;
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p.boostUntil = p.shieldUntil = p.slipUntil = p.slowUntil = 0;
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p.steerSm = 0;
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});
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this.emit('race_start', this.track);
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}
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_generateTrack() {
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const seed = crypto.randomBytes(4).readUInt32LE(0) || 1;
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const rng = mulberry32(seed);
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const obstacles = [];
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const powerups = [];
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const lanes = [70, 210, 350];
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let oid = 0, pid = 0;
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let d = 700;
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let puD = 1500;
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while (d < this.trackLength - 900) {
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const step = 250 + rng() * 190;
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// aantal geblokkeerde banen: nooit alle 3, zodat er altijd een doorgang is
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const blockCount = rng() < 0.18 ? 1 : 2;
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const idx = [0, 1, 2].sort(() => rng() - 0.5).slice(0, blockCount).sort((a, b) => a - b);
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for (const li of idx) {
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const type = rng() < 0.72 ? 'pylon' : 'oil';
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obstacles.push({
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id: 'o' + (oid++),
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type,
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d: Math.round(d + (rng() - 0.5) * 10),
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x: clamp(lanes[li] + (rng() - 0.5) * 26, 30, ROAD_W - 30),
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hh: type === 'oil' ? 26 : 14,
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});
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}
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// power-ups
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if (d >= puD && d + 500 < this.trackLength - 900) {
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const kind = pid % 2 === 0 ? 'boost' : 'shield';
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const x = lanes[Math.floor(rng() * 3)] + (rng() - 0.5) * 34;
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powerups.push({
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id: 'p' + (pid++),
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kind,
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d: Math.round(puD),
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x: clamp(x, 36, ROAD_W - 36),
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respawnAt: 0,
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});
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puD += 700 + rng() * 240;
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}
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d += step;
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}
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if (powerups.length === 0) {
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powerups.push({ id: 'p0', kind: 'boost', d: 1500, x: 210, respawnAt: 0 });
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}
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this.track = { seed, obstacles, powerups };
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return this.track;
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}
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_updatePhysics(dt, now) {
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this._rank();
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for (const p of this.players.values()) {
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if (p.finished) { p.speed = 0; continue; }
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// Snelheidsdoel
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let target = CRUISE + (p.boostUntil > now ? BOOST_BONUS : 0);
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if (p.slowUntil > now) target = Math.min(target, 70);
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p.speed += (target - p.speed) * Math.min(1, dt * 2.2);
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// Sturen: geleidelijk inslingeren (smoother) i.p.v. direct volle uitslag.
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// p.steer is het ruwe doel van de client, p.steerSm de opgerampte waarde.
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p.steerSm += (p.steer - p.steerSm) * Math.min(1, dt * STEER_RESPONSE);
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// Sturen (olie = wegglijden)
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let mv = p.steerSm * LATERAL * dt;
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if (p.slipUntil > now) mv = p.steerSm * LATERAL * 0.3 * dt + (Math.random() - 0.5) * 260 * dt;
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p.x = clamp(p.x + mv + (p.slipUntil > now ? (Math.random() - 0.5) * 90 * dt : 0),
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CAR_HALF_X, ROAD_W - CAR_HALF_X);
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p.d += p.speed * dt;
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if (p.d >= this.trackLength && !p.finished) {
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p.finished = true;
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p.finishTime = Math.max(1, now - this.raceStartedAt);
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this.emit('finish', { id: p.id, name: p.name, slot: p.rank });
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}
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}
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this._collisions(now);
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}
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_collisions(now) {
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if (!this.track) return;
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for (const p of this.players.values()) {
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if (p.finished) continue;
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for (const o of this.track.obstacles) {
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if (Math.abs(p.d - o.d) < OBJ_VH + CAR_HALF_Y &&
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Math.abs(p.x - o.x) < o.hh + CAR_HALF_X) {
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if (p.shieldUntil > now) continue;
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if (o.type === 'pylon' && p.slowUntil <= now) {
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p.slowUntil = now + 900;
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p.speed = Math.min(p.speed, 70);
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this.emit('hit', { id: p.id, kind: 'pylon' });
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} else if (o.type === 'oil' && p.slipUntil <= now) {
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p.slipUntil = now + 1300;
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p.speed *= 0.8;
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this.emit('hit', { id: p.id, kind: 'oil' });
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}
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}
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}
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for (const pu of this.track.powerups) {
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if (pu.respawnAt > now) continue;
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if (Math.abs(p.d - pu.d) < PICKUP_VH + CAR_HALF_Y &&
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Math.abs(p.x - pu.x) < PICKUP_RADIUS + CAR_HALF_X) {
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if (pu.kind === 'boost') p.boostUntil = now + 2600;
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else p.shieldUntil = now + 5000;
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pu.respawnAt = now + 4500;
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this.emit('pickup', { id: p.id, kind: pu.kind });
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}
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}
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}
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}
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_rank() {
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const arr = [...this.players.values()];
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arr.sort((a, b) => {
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if (a.finished && b.finished) return a.finishTime - b.finishTime;
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if (a.finished) return -1;
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if (b.finished) return 1;
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return b.d - a.d;
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});
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arr.forEach((p, i) => { p.rank = i + 1; });
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return arr;
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}
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snapshot() {
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const now = Date.now();
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this._rank();
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const players = [...this.players.values()].map((p) => ({
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id: p.id,
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name: p.name,
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color: p.color,
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x: +p.x.toFixed(1),
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d: Math.round(p.d),
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speed: Math.round(p.speed),
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finished: p.finished,
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finishTime: p.finishTime,
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rank: p.rank,
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boost: p.boostUntil > now,
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shield: p.shieldUntil > now,
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slip: p.slipUntil > now,
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}));
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return {
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type: 'snapshot',
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phase: this.phase,
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countdownEndsAt: this.countdownEndsAt,
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raceEndsAt: this.raceEndsAt,
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raceDuration: this.raceDurationS,
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trackLength: this.trackLength,
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maxPlayers: this.maxPlayers,
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players,
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};
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}
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}
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module.exports = Game;
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