constructor(r, num, d) {

    this.r = r;

    this.num = num;

    this.d = d;

    this.angle = 0;

    this.amt = 0;

    this.min = 0;

  }

  display() {

    // fill(255);

    noStroke();

    for (let i=0; i<this.num; i++) {

      let startingAngle = 360/this.num * i; 

      let x = this.r*cos(startingAngle + this.angle);

      let y = this.r*sin(startingAngle + this.angle);

      ellipse(x, y, this.d, this.d);

    }

  }

  move() {

    // this.angle += 1;

    // Linear Interpolation eqn: y = min + amt * (max - min)

    this.angle = this.min + easeInOutQuad(this.amt) * 360/this.num;

    if (this.amt > 1) {

      this.amt = 0;

      this.min += 360/this.num;

    } else {

      this.amt += 0.01;

    }

  }

}