class PDF::Reader::Rectangle

def set_corners(x1, y1, x2, y2)
  @bottom_left = PDF::Reader::Point.new(
    [x1, x2].min,
    [y1, y2].min,
  )
  @bottom_right = PDF::Reader::Point.new(
    [x1, x2].max,
    [y1, y2].min,
  )
  @top_left = PDF::Reader::Point.new(
    [x1, x2].min,
    [y1, y2].max,
  )
  @top_right = PDF::Reader::Point.new(
    [x1, x2].max,
    [y1, y2].max,
  )
end