code: func (f *Fpdf) SetLink(link int, y float64, page int) {
  	if y == -1 {
  		y = f.y
  	}
  	if page == -1 {
  		page = f.page
  	}
  	f.links[link] = intLinkType{page, y}
  }
docs: // SetLink defines the page and position a link points to. See AddLink().