133 lines
4.9 KiB
TypeScript
133 lines
4.9 KiB
TypeScript
/**
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* Tracks the position of every player on the map, and sends notifications to the players interested in knowing about the move
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* (i.e. players that are looking at the zone the player is currently in)
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*
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* Internally, the PositionNotifier works with Zones. A zone is a square area of a map.
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* Each player is in a given zone, and each player tracks one or many zones (depending on the player viewport)
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*
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* The PositionNotifier is important for performance. It allows us to send the position of players only to a restricted
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* number of players around the current player.
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*/
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import {EntersCallback, LeavesCallback, MovesCallback, Zone} from "./Zone";
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import {PointInterface} from "_Model/Websocket/PointInterface";
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import {User} from "_Model/User";
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import {ViewportInterface} from "_Model/Websocket/ViewportMessage";
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import {Movable} from "_Model/Movable";
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import {PositionInterface} from "_Model/PositionInterface";
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interface ZoneDescriptor {
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i: number;
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j: number;
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}
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export class PositionNotifier {
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// TODO: we need a way to clean the zones if noone is in the zone and noone listening (to free memory!)
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private zones: Zone[][] = [];
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constructor(private zoneWidth: number, private zoneHeight: number, private onUserEnters: EntersCallback, private onUserMoves: MovesCallback, private onUserLeaves: LeavesCallback) {
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}
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private getZoneDescriptorFromCoordinates(x: number, y: number): ZoneDescriptor {
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return {
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i: Math.floor(x / this.zoneWidth),
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j: Math.floor(y / this.zoneHeight),
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}
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}
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/**
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* Sets the viewport coordinates.
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* Returns the list of new users to add
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*/
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public setViewport(user: User, viewport: ViewportInterface): Movable[] {
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if (viewport.left > viewport.right || viewport.top > viewport.bottom) {
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console.warn('Invalid viewport received: ', viewport);
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return [];
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}
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const oldZones = user.listenedZones;
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const newZones = new Set<Zone>();
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const topLeftDesc = this.getZoneDescriptorFromCoordinates(viewport.left, viewport.top);
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const bottomRightDesc = this.getZoneDescriptorFromCoordinates(viewport.right, viewport.bottom);
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for (let j = topLeftDesc.j; j <= bottomRightDesc.j; j++) {
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for (let i = topLeftDesc.i; i <= bottomRightDesc.i; i++) {
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newZones.add(this.getZone(i, j));
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}
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}
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const addedZones = [...newZones].filter(x => !oldZones.has(x));
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const removedZones = [...oldZones].filter(x => !newZones.has(x));
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let things: Movable[] = [];
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for (const zone of addedZones) {
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zone.startListening(user);
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things = things.concat(Array.from(zone.getThings()))
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}
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for (const zone of removedZones) {
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zone.stopListening(user);
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}
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return things;
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}
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public enter(thing: Movable): void {
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const position = thing.getPosition();
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const zoneDesc = this.getZoneDescriptorFromCoordinates(position.x, position.y);
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const zone = this.getZone(zoneDesc.i, zoneDesc.j);
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zone.enter(thing, null, position);
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}
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public updatePosition(thing: Movable, newPosition: PositionInterface, oldPosition: PositionInterface): void {
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// Did we change zone?
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const oldZoneDesc = this.getZoneDescriptorFromCoordinates(oldPosition.x, oldPosition.y);
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const newZoneDesc = this.getZoneDescriptorFromCoordinates(newPosition.x, newPosition.y);
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if (oldZoneDesc.i != newZoneDesc.i || oldZoneDesc.j != newZoneDesc.j) {
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const oldZone = this.getZone(oldZoneDesc.i, oldZoneDesc.j);
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const newZone = this.getZone(newZoneDesc.i, newZoneDesc.j);
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// Leave old zone
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oldZone.leave(thing, newZone);
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// Enter new zone
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newZone.enter(thing, oldZone, newPosition);
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} else {
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const zone = this.getZone(oldZoneDesc.i, oldZoneDesc.j);
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zone.move(thing, newPosition);
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}
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}
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public leave(thing: Movable): void {
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const oldPosition = thing.getPosition();
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const oldZoneDesc = this.getZoneDescriptorFromCoordinates(oldPosition.x, oldPosition.y);
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const oldZone = this.getZone(oldZoneDesc.i, oldZoneDesc.j);
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oldZone.leave(thing, null);
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}
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public removeViewport(user: User): void {
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// Also, let's stop listening on viewports
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for (const zone of user.listenedZones) {
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zone.stopListening(user);
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}
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}
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private getZone(i: number, j: number): Zone {
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let zoneRow = this.zones[j];
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if (zoneRow === undefined) {
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zoneRow = new Array<Zone>();
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this.zones[j] = zoneRow;
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}
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let zone = this.zones[j][i];
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if (zone === undefined) {
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zone = new Zone(this.onUserEnters, this.onUserMoves, this.onUserLeaves, i, j);
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this.zones[j][i] = zone;
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}
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return zone;
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}
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}
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