partey_workadventure/front/src/Phaser/Game/PlayerMovement.ts

import { MAX_EXTRAPOLATION_TIME } from "../../Enum/EnvironmentVariable";
import type { PositionInterface } from "../../Connexion/ConnexionModels";
import type { HasPlayerMovedEvent } from "../../Api/Events/HasPlayerMovedEvent";

export class PlayerMovement {
    public constructor(
        private startPosition: PositionInterface,
        private startTick: number,
        private endPosition: HasPlayerMovedEvent,
        private endTick: number
    ) {}

    public isOutdated(tick: number): boolean {
        //console.log(tick, this.endTick, MAX_EXTRAPOLATION_TIME)

        // If the endPosition is NOT moving, no extrapolation needed.
        if (this.endPosition.moving === false && tick > this.endTick) {
            return true;
        }

        return tick > this.endTick + MAX_EXTRAPOLATION_TIME;
    }

    public getPosition(tick: number): HasPlayerMovedEvent {
        // Special case: end position reached and end position is not moving
        if (tick >= this.endTick && this.endPosition.moving === false) {
            //console.log('Movement finished ', this.endPosition)
            return this.endPosition;
        }

        const x =
            (this.endPosition.x - this.startPosition.x) * ((tick - this.startTick) / (this.endTick - this.startTick)) +
            this.startPosition.x;
        const y =
            (this.endPosition.y - this.startPosition.y) * ((tick - this.startTick) / (this.endTick - this.startTick)) +
            this.startPosition.y;
        //console.log('Computed position ', x, y)
        return {
            x,
            y,
            direction: this.endPosition.direction,
            moving: true,
        };
    }
}