libcgal-dev 4.7-4 / usr / include / CGAL / General_polygon_2.h

// Copyright (c) 2005  Tel-Aviv University (Israel).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
// 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.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL$
// $Id$
// 
//
// Author(s)     : Baruch Zukerman <baruchzu@post.tau.ac.il>

#ifndef CGAL_GENERAL_POLYGON_2_H
#define CGAL_GENERAL_POLYGON_2_H

#include <list>
#include <CGAL/Boolean_set_operations_2/Gps_traits_adaptor.h>
#include <CGAL/Bbox_2.h>


namespace CGAL {

template <class Arr_traits>
class General_polygon_2
{
public:

  typedef Arr_traits                                 Traits_2;
  typedef typename Traits_2::Point_2                 Point_2;
  typedef typename Traits_2::X_monotone_curve_2      X_monotone_curve_2;
  typedef std::list<X_monotone_curve_2>              Containter;
  typedef typename Containter::iterator              Curve_iterator;
  typedef typename Containter::const_iterator        Curve_const_iterator;

protected:
  std::list<X_monotone_curve_2>    m_xcurves;

public:

  General_polygon_2(){}

  template <class CurveIterator>
  General_polygon_2(CurveIterator begin,
                    CurveIterator end) : m_xcurves (begin, end)
  {}

  template <class CurveIterator>
  void init(CurveIterator begin, CurveIterator end)
  {
    m_xcurves.clear();
    m_xcurves.insert(m_xcurves.end(), begin, end);
  }

  template <class CurveIterator>
  void insert(CurveIterator begin, CurveIterator end)
  {
    m_xcurves.insert(m_xcurves.end(), begin, end);
  }

  bool is_empty() const
  {
    return m_xcurves.empty();
  }

  unsigned int size() const
  {
    return static_cast<unsigned int>(m_xcurves.size());
  }

  Curve_iterator curves_begin()
  {
    return m_xcurves.begin();
  }

  Curve_iterator curves_end()
  {
    return m_xcurves.end();
  }

  Curve_const_iterator curves_begin() const
  {
    return m_xcurves.begin();
  }

  Curve_const_iterator curves_end() const
  {
    return m_xcurves.end();
  }

  void push_back(const X_monotone_curve_2& cv)
  {
    m_xcurves.push_back(cv);
  }

  void clear()
  {
    m_xcurves.clear();
  }

  Curve_iterator erase(Curve_iterator it)
  {
    return (m_xcurves.erase(it));
  }

  Orientation orientation() const
  {
    Gps_traits_adaptor<Traits_2>  tr;
    return (tr.orientation_2_object()(m_xcurves.begin(), m_xcurves.end()));
  }
  
  void reverse_orientation()
  {
    m_xcurves.reverse();
    Traits_2 tr;
    typename Traits_2::Construct_opposite_2 ctr_opp =
      tr.construct_opposite_2_object();
    for(Curve_iterator ci = m_xcurves.begin(); ci != m_xcurves.end(); ++ci)
    {
      const X_monotone_curve_2& opp_cv = ctr_opp(*ci);
      *ci = opp_cv;
    }
  }

  template <class OutputIterator>
  void approximate(OutputIterator oi, unsigned int n) const
  {
    for(Curve_const_iterator itr = m_xcurves.begin();
        itr != m_xcurves.end();
        ++itr)
    {
      itr->approximate(oi, n);
    }
  }

  Bbox_2 bbox() const
  {
    Bbox_2 result;
    if(m_xcurves.empty())
      return (result);

    Curve_const_iterator first = m_xcurves.begin();
    result = first->bbox();

    for(++first; first != m_xcurves.end(); ++first)
    {
      result = result + first->bbox();
    }
      
    return result;
  }
};


//-----------------------------------------------------------------------//
//                          operator>>
//-----------------------------------------------------------------------//

template <class Traits>
std::istream &operator>>(std::istream &is, General_polygon_2<Traits>& p)
{
  int n; // number of edges
  is >> n;
  typename Traits::X_monotone_curve_2 cv;
 
  if (is) {
      p.clear();
      for (int i=0; i<n; i++) {
        is >> cv;
        p.push_back(cv);
      }
  }
 
  return is;
}

//-----------------------------------------------------------------------//
//                          operator<<
//-----------------------------------------------------------------------//

template <class Traits>
std::ostream
&operator<<(std::ostream &os, const General_polygon_2<Traits>& p)
{
  typename General_polygon_2<Traits>::Curve_const_iterator i;

  switch(os.iword(IO::mode)) {
    case IO::ASCII :
      os << p.size() << ' ';
      for (i = p.curves_begin(); i != p.curves_end(); ++i) {
        os << *i << ' ';
      }
      return os;

    case IO::BINARY :
      os << p.size();
      for (i = p.curves_begin(); i != p.curves_end(); ++i) {
        os << *i;
      }
      return os;

    default:
      os << "Polygon_2(" << std::endl;
      for (i = p.curves_begin(); i != p.curves_end(); ++i) {
        os << "  " << *i << std::endl;
      }
      os << ")" << std::endl;
      return os;
  }
}

} //namespace CGAL

#endif