text: /*
    This file is part of LilyPond, the GNU music typesetter.
  
    Copyright (C) 2008--2020 Han-Wen Nienhuys <hanwen@lilypond.org>
  
  
    LilyPond is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
  
    LilyPond is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
  
    You should have received a copy of the GNU General Public License
    along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  */
  
  #include "skyline-pair.hh"
  
  #include "international.hh"
  
  using std::vector;
  
  Skyline_pair::Skyline_pair ()
    : skylines_ (Skyline (DOWN), Skyline (UP))
  {
  }
  
  Skyline_pair::Skyline_pair (vector<Box> const &boxes, Axis a)
    : skylines_ (Skyline (boxes, a, DOWN), Skyline (boxes, a, UP))
  {
    // TODO: The boxes sort equally for up & down,
    // so we can save ourselves one sort step.
  }
  
  Skyline_pair::Skyline_pair (vector<Drul_array<Offset> > const &buildings, Axis a)
    : skylines_ (Skyline (buildings, a, DOWN), Skyline (buildings, a, UP))
  {
  }
  
  Skyline_pair::Skyline_pair (vector<Skyline_pair> const &skypairs)
    : skylines_ (Skyline (skypairs, DOWN), Skyline (skypairs, UP))
  {
  }
  
  Skyline_pair::Skyline_pair (Box const &b, Axis a)
    : skylines_ (Skyline (b, a, DOWN), Skyline (b, a, UP))
  {
  }
  
  void
  Skyline_pair::raise (Real r)
  {
    skylines_[UP].raise (r);
    skylines_[DOWN].raise (r);
  }
  
  void
  Skyline_pair::pad (Real r)
  {
    if (!r)
      return;
    for (UP_and_DOWN (d))
      skylines_[d] = skylines_[d].padded (r);
  }
  
  void
  Skyline_pair::shift (Real r)
  {
    skylines_[UP].shift (r);
    skylines_[DOWN].shift (r);
  }
  
  void
  Skyline_pair::merge (Skyline_pair const &other)
  {
    skylines_[UP].merge (other[UP]);
    skylines_[DOWN].merge (other[DOWN]);
  }
  
  void
  Skyline_pair::print () const
  {
    skylines_[UP].print ();
    skylines_[DOWN].print ();
  }
  
  Real
  Skyline_pair::left () const
  {
    return std::min (skylines_[UP].left (), skylines_[DOWN].left ());
  }
  
  Real
  Skyline_pair::right () const
  {
    return std::max (skylines_[UP].right (), skylines_[DOWN].right ());
  }
  
  void
  Skyline_pair::print_points () const
  {
    skylines_[UP].print_points ();
    skylines_[DOWN].print_points ();
  }
  
  bool
  Skyline_pair::is_empty () const
  {
    return skylines_[UP].is_empty ()
           && skylines_[DOWN].is_empty ();
  }
  
  Skyline &
  Skyline_pair::operator [] (Direction d)
  {
    return skylines_[d];
  }
  
  Skyline const &
  Skyline_pair::operator [] (Direction d) const
  {
    return skylines_[d];
  }
  
  const char *const Skyline_pair::type_p_name_ = "ly:skyline-pair?";
  
  MAKE_SCHEME_CALLBACK (Skyline_pair, skyline, 2);
  SCM
  Skyline_pair::skyline (SCM smob, SCM dir_scm)
  {
    Skyline_pair *sp = unsmob<Skyline_pair> (smob);
    Direction dir = from_scm (dir_scm, UP);
  
    if (dir == CENTER)
      {
        warning (_f ("direction must not be CENTER in ly:skyline-pair::skyline"));
        dir = UP;
      }
  
    return (*sp)[dir].smobbed_copy ();
  }
  