this.top = random(40, height / 2);

    this.bottom = random(30, height / 2);

    this.x = width + 250;

    this.w = 20;

    this.speed = 2;

​

    this.display = function() {

        fill(255);

        rect(this.x, 0, this.w, this.top);

        rect(this.x, height - this.bottom, this.w, this.bottom);

    }

​

    this.move = function() {

        this.x -= this.speed;

    }

​

    this.offscreen = function() {

        return (this.x + this.w + 20 < 0);

    }

}