asteroid.ts

class Asteroid extends GameObject implements Observer{
    private _speedX : number = Math.random() < 0.5 ? Math.random() - 1 * 1.5 : Math.random() * 1.5;
    private _speedY : number = Math.random() < 0.5 ? Math.random() - 1 * 1.5 : Math.random() * 1.5;

    private _subject : Subject;
    
    private _rotationSpeed : number = Math.random()*2;

    private _asteroidList : Array<Asteroid>;

    constructor(s:Subject) {
        super(Math.floor((Math.random() * window.innerWidth) + window.innerWidth / 2), Math.floor((Math.random() * window.innerHeight) + 1), 0, 'asteroid'+Math.floor(Math.random() * 4 + 1));
        this._subject = s;
    }

    public update() : void {
        this.x += this._speedX;
        this.y += this._speedY;
        this.rotation += this._rotationSpeed;
        super.outsideWindow();
    }

    public notify() {
        this.explode();
    }

    public explode() {
        this._subject.unsubscribe(this);
        new AsteroidExplosion(this.x, this.y);
        this.remove();
    }
}