constructor(x, y, r) {

    this.x = x;

    this.y = y;

    this.r = r;

    this.c = 255;

  }

​

  display() {

    fill(this.c);

    circle(this.x, this.y, this.r);

  }

​

  hover(other) {

    let d = dist(this.x, this.y, other.x, other.y);

    if (mouseIsPressed) {

      if (d <= this.r) {

        this.c = 0;

      }

    } else {

        this.c = 255;

      }

  }

}

​