zombie-game/resources/js/net/NetEntities.js

import { Zombie } from '../game/Zombie.js';
import { MegaTank } from '../game/MegaTank.js';
import { Leaper } from '../game/Leaper.js';
import { Witch } from '../game/Witch.js';
import { MegaWitch } from '../game/MegaWitch.js';
import { Boss } from '../game/Boss.js';
import { Bullet } from '../game/Bullet.js';
import { WitchProjectile } from '../game/WitchProjectile.js';
import { Pickup } from '../game/Pickup.js';
import { Player } from '../game/Player.js';
import { Vector2D } from '../engine/Vector2D.js';

const CLASSES = {
  zombie: Zombie,
  megatank: MegaTank,
  leaper: Leaper,
  witch: Witch,
  megawitch: MegaWitch,
  boss: Boss,
  bullet: Bullet,
  projectile: WitchProjectile,
};

const PLAYER_SIZE = 24;

export class NetEntities {
  constructor() {
    this.target = { pos: new Vector2D(960, 540) };
    this.views = new Map();
    this.players = new Map();
  }

  setTarget(x, y) {
    this.target.pos.x = x;
    this.target.pos.y = y;
  }

  _timeFor(eid, now) {
    return now + (eid % 17) * 0.21 + (eid % 5) * 0.07;
  }

  _key(entity) {
    return `${entity.d}#${entity.eid}`;
  }

  _createView(entity) {
    const Ctor = CLASSES[entity.d];
    if (entity.d === 'pickup') {
      return new Pickup(entity.x, entity.y, entity.t, { container: null, viewport: {}, life: 10 });
    }
    if (entity.d === 'bullet' || entity.d === 'projectile') {
      return new Ctor(entity.x, entity.y, new Vector2D(1, 0), {});
    }
    return new Ctor(entity.x, entity.y, this.target, {});
  }

  draw(entities, players, renderer, textRenderer, now) {
    const seen = new Set();
    let boss = null;

    for (const entity of entities) {
      const key = this._key(entity);
      seen.add(key);
      let view = this.views.get(key);
      if (!view) {
        view = this._createView(entity);
        this.views.set(key, view);
      }
      this._stamp(view, entity, now);
      view.draw(renderer, textRenderer);
      if (entity.d === 'boss') {
        boss = view;
      }
    }

    for (const [key, view] of this.views) {
      if (!seen.has(key)) {
        this.views.delete(key);
      }
    }

    for (const snapshot of players) {
      let view = this.players.get(snapshot.id);
      if (!view) {
        view = new Player({
          input: null,
          container: null,
          viewport: { width: 1920, height: 1080 },
          size: PLAYER_SIZE,
        });
        this.players.set(snapshot.id, view);
      }
      this._stampPlayer(view, snapshot, now);
      if (!snapshot.dead) {
        view.draw(renderer);
      }
    }

    for (const [id, view] of this.players) {
      if (!players.some((snapshot) => snapshot.id === id)) {
        this.players.delete(id);
      }
    }

    return boss;
  }

  clear() {
    this.views.clear();
    this.players.clear();
  }

  _stamp(view, entity, now) {
    view.pos.x = entity.x;
    view.pos.y = entity.y;
    if (entity.s !== undefined) {
      view.size = entity.s;
    }
    if (entity.c) {
      view.baseColor = [entity.c[0], entity.c[1], entity.c[2], 1];
    }
    if (entity.hp !== undefined && entity.mhp !== undefined) {
      view.health = entity.hp;
      view.maxHealth = entity.mhp;
    }
    view._time = this._timeFor(entity.eid, now);
    view._flash = 0;

    if (entity.et !== undefined) {
      view._emergeTotal = entity.et;
      view._emerge = entity.er ?? 0;
    }

    switch (entity.d) {
      case 'leaper':
        view._dashTimer = entity.dash ? 999 : 0;
        view._windupTimer = entity.wind ? 999 : 0;
        if (!view._dashDirection) {
          view._dashDirection = { x: 1, y: 0 };
        }
        break;
      case 'megawitch':
        view._novaTimer = (1 - (entity.charge ?? 0)) * view.novaInterval;
        break;
      case 'witch':
        view._cast = 0;
        view._fireTimer = view.fireInterval * (1 - ((entity.eid * 0.37 + now * 0.11) % 1));
        break;
      case 'boss':
        view._hurt = 0;
        break;
      case 'pickup':
        view._time = Math.max(0, 10 - entity.life);
        break;
      default:
        break;
    }
  }

  _stampPlayer(view, snapshot, now) {
    view.pos.x = snapshot.x;
    view.pos.y = snapshot.y;
    const aim = new Vector2D(snapshot.aimX, snapshot.aimY);
    if (aim.lengthSqrt() > 0.01) {
      view._aimDirection = aim.normalize();
    }
    view._time = now;
    view._damageCooldown = 0;
    view.health = snapshot.hp;
    view.maxHealth = snapshot.mhp;
  }
}