la-visitor/scripts/space/moving.js

class move_direction {
    static get add() {
        return 1;
    }

    static get stop() {
        return 0;
    }

    static get sub() {
        return -1;
    }

    static contains(target) {
        if (target === move_direction.add) return true;
        if (target === move_direction.stop) return true;
        if (target === move_direction.sub) return true;
    
        return false;
    }
}

class moving {
    #x;
    #y;
    #z;

    constructor() {
        this.#x = 0;
        this.#y = 0;
        this.#z = 0;
    }

    get x() {
        return this.#x;
    }

    get y() {
        return this.#y;
    }

    get z() {
        return this.#z;
    }

    set x(target) {
        if (!move_direction.contains(target)) {
            throw new TypeError("New direction must be from move direction.");
        }

        this.#x = target;
    }

    set y(target) {
        if (!move_direction.contains(target)) {
            throw new TypeError("New direction must be from move direction.");
        }

        this.#y = target;
    }

    set z(target) {
        if (!move_direction.contains(target)) {
            throw new TypeError("New direction must be from move direction.");
        }

        this.#z = target;
    }

    stop() {
        this.x = move_direction.stop;
        this.y = move_direction.stop;
        this.z = move_direction.stop;
    }
}

export { moving, move_direction }