constructor(d, s, locationx, locationy ) {

     this.direction = d;

     this.speed = s;

     this.x = locationx;

     this.y = locationy;

   }

  //Update Plastic position

  update() {

     this.x = this.x + this.speed * Math.cos(this.direction);

     this.y = this.y + this.speed * Math.sin(this.direction);

     this.direction = Math.random() * Math.PI * 2;

  }

  //Reset 70% when it hits border

  border(w, h) {

    if (this.x >= w) {

      if (Math.random() > 0.7 ) {

        this.reset(w, h);

      }

      this.x = 0;

    }

    else if (this.y >= h) {

      if (Math.random() > 0.7 ) {

        this.reset(w, h);

      }

      this.y = 0;

    }

    else if (this.x <= 0) {

      if (Math.random() > 0.7 ) {

        this.reset(w, h);

      }

      this.x = w;

    }

    else if (this.y <= 0 ) {

      if (Math.random() > 0.7 ) {

        this.reset(w, h);

      }

      this.y = h;

    }

  }

  //Make plastic to flow in current

  current( flow ) {

    this.direction = (this.direction + flow) / 2;

  }

  //Reset its position and direction

  reset(w, h) {

    this.x = Math.random() * w;

    this.y = Math.random() * h;

    this.direction = Math.random() * Math.PI * 2;

  }

}