96 lines
2.3 KiB
TypeScript
96 lines
2.3 KiB
TypeScript
import { World, ConnectCallback, DisconnectCallback } from "./World";
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import { User } from "./User";
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import {PositionInterface} from "_Model/PositionInterface";
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import {uuid} from "uuidv4";
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import {Movable} from "_Model/Movable";
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export class Group implements Movable {
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static readonly MAX_PER_GROUP = 4;
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private static nextId: number = 1;
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private id: number;
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private users: Set<User>;
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private connectCallback: ConnectCallback;
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private disconnectCallback: DisconnectCallback;
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constructor(users: User[], connectCallback: ConnectCallback, disconnectCallback: DisconnectCallback) {
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this.users = new Set<User>();
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this.connectCallback = connectCallback;
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this.disconnectCallback = disconnectCallback;
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this.id = Group.nextId;
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Group.nextId++;
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users.forEach((user: User) => {
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this.join(user);
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});
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}
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getUsers(): User[] {
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return Array.from(this.users.values());
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}
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getId() : number {
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return this.id;
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}
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/**
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* Returns the barycenter of all users (i.e. the center of the group)
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*/
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getPosition(): PositionInterface {
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let x = 0;
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let y = 0;
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// Let's compute the barycenter of all users.
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this.users.forEach((user: User) => {
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x += user.position.x;
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y += user.position.y;
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});
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x /= this.users.size;
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y /= this.users.size;
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return {
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x,
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y
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};
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}
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isFull(): boolean {
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return this.users.size >= Group.MAX_PER_GROUP;
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}
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isEmpty(): boolean {
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return this.users.size <= 1;
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}
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join(user: User): void
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{
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// Broadcast on the right event
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this.connectCallback(user.id, this);
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this.users.add(user);
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user.group = this;
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}
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leave(user: User): void
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{
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const success = this.users.delete(user);
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if (success === false) {
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throw new Error("Could not find user "+user.id+" in the group "+this.id);
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}
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user.group = undefined;
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// Broadcast on the right event
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this.disconnectCallback(user.id, this);
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}
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/**
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* Let's kick everybody out.
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* Usually used when there is only one user left.
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*/
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destroy(): void
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{
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for (const user of this.users) {
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this.leave(user);
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}
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}
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}
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