big_chess.hh

// Copyright (C) 2008, 2009 EPITA Research and Development Laboratory (LRDE)
//
// This file is part of Olena.
//
// Olena 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, version 2 of the License.
//
// Olena 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 Olena.  If not, see <http://www.gnu.org/licenses/>.
//
// As a special exception, you may use this file as part of a free
// software project without restriction.  Specifically, if other files
// instantiate templates or use macros or inline functions from this
// file, or you compile this file and link it with other files to produce
// an executable, this file does not by itself cause the resulting
// executable to be covered by the GNU General Public License.  This
// exception does not however invalidate any other reasons why the
// executable file might be covered by the GNU General Public License.

#ifndef MLN_FUN_P2B_BIG_CHESS_HH
# define MLN_FUN_P2B_BIG_CHESS_HH

# include <mln/core/concept/function.hh>
# include <mln/core/alias/point2d.hh>


namespace mln
{

  namespace fun
  {

    namespace p2b
    {

      // FIXME: Doc!
      template <typename B>
      struct big_chess : public Function_v2b< big_chess<B> >
      {
        typedef bool result;
        typedef mln_psite(B) P;

        big_chess(const B& box, const unsigned div);

        bool operator()(const P& p) const;

        const B& box;
        const unsigned div;
      };


# ifndef MLN_INCLUDE_ONLY

      template < typename B>
      big_chess<B>::big_chess(const B& box, const unsigned div)
        : box(box), div(div)
      {
      }

      template < typename B>
      inline
      bool
      big_chess<B>::operator()(const P& p) const
      {
        mln_coord(P) ret = 0;

        for (short i = 0; i < P::dim; i++)
          ret += p[i] / ((box.pmax()[i] - 1) / div);

        return ret % 2;
      }

# endif // ! MLN_INCLUDE_ONLY

    } // end of namespace mln::fun::p2b

  } // end of namespace mln::fun

} // end of namespace mln


#endif // ! MLN_FUN_P2B_BIG_CHESS_HH