this.top = random(height/2);

  this.bottom = random(height/2);

  this.x = width;

  this.w = 20;

  this.speed = 2;

  this.highlight = false; 

   this.hits = function(bird){

     if (bird.y < this.top || bird.y > height - this.bottom) {

       if (bird.x > this.x && bird.x < this.x + this.w){

         this.highlight = true;

         return true;

       }

     } else {

       this.hightlight = false; 

       return false; 

     }

  }

  this.show = function(){

    fill(255);

    if (this.highlight) {

      fill(255,0,0);

    }

    rect(this.x, 0, this.w, this.top)

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

  }

  this.update = function() {

    this.x -= this.speed

  }

  this.offscreen = function() {

    if (this.x < -this. w){

      return true;

    } else {

      return false;

    }

  }

}