class Pan
{
  PImage backgroundImage;
  float bx;
  float by;
  float speed = 10;

  Pan (String bi)
  {
    backgroundImage = loadImage(bi); 
    image(backgroundImage, bx, by); 
  }

  void update()
  {
    image(backgroundImage, bx, by);
  }

  void moveup()
  {
    by = by + speed;
  }

  void movedown()
  {
    by = by - speed;
  }

  void moveleft()
  {
    bx = bx + speed;
  }

  void moveright()
  {
    bx = bx - speed;
  }
}