Edge.hpp

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//  This file is part of ff3d - http://www.freefem.org/ff3d
//  Copyright (C) 2001, 2002, 2003 Stéphane Del Pino

//  This program 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 2, or (at your option)
//  any later version.

//  This program 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 this program; if not, write to the Free Software Foundation,
//  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  

//  $Id: Edge.hpp,v 1.9 2007/05/20 23:02:47 delpinux Exp $


#ifndef LINE_HPP
#define LINE_HPP

#include <Vertex.hpp>
#include <utility>

class Edge
{
public:
  enum {
    NumberOfVertices = 2
  };

  typedef std::pair<Vertex*, Vertex*> Pair;
private:
  Edge::Pair __verticesPair;    
  size_t __reference;           
public:
  real_t lenght() const
  {
    return Norm(*__verticesPair.first - *__verticesPair.second);
  }

  const size_t& reference() const
  {
    return __reference;
  }

  size_t& reference()
  {
    return __reference;
  }

  inline  Vertex& operator() (const size_t& i) 
  {
    ASSERT (i<2);
    switch(i) {
    case 0:
      return *(__verticesPair.first);
    case 1:
      return *(__verticesPair.second);
    }
    return *(__verticesPair.first); // Never reached
  }

  inline  const Vertex& operator() (const size_t& i) const
  {
    ASSERT (i<2);
    switch(i) {
    case 0:
      return *(__verticesPair.first);
    case 1:
      return *(__verticesPair.second);
    }
    return *(__verticesPair.first); // Never reached
  }

  inline bool operator==(const Edge& e) const
  {
    return (__verticesPair==e.__verticesPair);
  }

  inline bool operator<(const Edge& e) const
  {
    if (__verticesPair.first == e.__verticesPair.first) {
      return (__verticesPair.second < e.__verticesPair.second);
    } else {
      return (__verticesPair.first < e.__verticesPair.first);
    }
  }

  inline const Edge& operator=(const Edge& e)
  {
    __verticesPair = e.__verticesPair;
    __reference = e.__reference;

    return *this;
  }

  inline operator Pair&()
  {
    return __verticesPair;
  }

  inline operator const Pair&() const
  {
    return __verticesPair;
  }

  Vertex* firstCommonVertex(const Edge::Pair& e) const
  {
    if ((__verticesPair.first == e.first)
        or (__verticesPair.first == e.second)) {
      return __verticesPair.first;
    }

    if ((__verticesPair.second == e.first)
        or (__verticesPair.second == e.second)) {
      return __verticesPair.second;
    }

    return 0;
  }

  Edge()
  {
    ;
  }

  Edge(const Edge& E)
    : __verticesPair(E.__verticesPair),
      __reference(E.__reference)
  {
    ;
  }

  Edge(const Vertex& v1, const Vertex& v2,
       const size_t& reference=0)
    : __reference(reference)
  {
    Vertex* V1 = const_cast<Vertex*>((&v1<&v2) ? &v1 : &v2);
    Vertex* V2 = const_cast<Vertex*>((&v1>&v2) ? &v1 : &v2);
    __verticesPair = Pair(V1, V2);
  }

  Edge(const Edge::Pair& vp,
       const size_t& reference=0)
    : __verticesPair(vp),
      __reference(reference)
  {
    ;
  }

  ~Edge()
  {
    ;
  }

  friend std::ostream& operator << (std::ostream& os,
                                    const Edge& e);
};

#endif // LINE_HPP

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