// Copyright (c) 1999  
// Utrecht University (The Netherlands),
// ETH Zurich (Switzerland),
// INRIA Sophia-Antipolis (France),
// Max-Planck-Institute Saarbruecken (Germany),
// and 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 Lesser 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)     : Andreas Fabri, Stefan Schirra

#ifndef CGAL_AFF_TRANSFORMATION_2_H
#define CGAL_AFF_TRANSFORMATION_2_H

#include <CGAL/basic.h>
#include <CGAL/Dimension.h>

namespace CGAL {

template <class R_>
class Aff_transformation_2 : public R_::Kernel_base::Aff_transformation_2
{
  typedef typename R_::RT                    RT;
  typedef typename R_::FT                    FT;
  typedef typename R_::Line_2                Line_2;
  typedef typename R_::Direction_2           Direction_2;
  typedef typename R_::Vector_2              Vector_2;
  typedef typename R_::Kernel_base::Aff_transformation_2 RAff_transformation_2;
public:

  typedef CGAL::Dimension_tag<2>            Ambient_dimension;

  typedef  R_                               R;

  Aff_transformation_2() {}

  Aff_transformation_2(const RAff_transformation_2& t)
    : RAff_transformation_2(t)
  {}

  Aff_transformation_2(const Identity_transformation tag)
    : RAff_transformation_2(tag)
  {}

  Aff_transformation_2(const Translation tag, const Vector_2 &v)
    : RAff_transformation_2(tag, v)
  {}

  // Rational Rotation:
  Aff_transformation_2(const Rotation tag,
                       const Direction_2 &d,
                       const RT &num,
                       const RT &den = RT(1))
    : RAff_transformation_2(tag, d, num, den)
  {}

  Aff_transformation_2(const Rotation tag,
                       const RT &sin,
                       const RT &cos,
                       const RT &den = RT(1))
    : RAff_transformation_2(tag, sin, cos, den)
  {}

  Aff_transformation_2(const Reflection tag, const Line_2& l )
    : RAff_transformation_2(tag, l)
  {}

  Aff_transformation_2(const Scaling tag,
                       const RT &s,
                       const RT &w= RT(1))
    : RAff_transformation_2(tag, s, w)
  {}

  // The general case:
  Aff_transformation_2(const RT & m11,
                       const RT & m12,
                       const RT & m13,

                       const RT & m21,
                       const RT & m22,
                       const RT & m23,

                       const RT &w= RT(1))
    : RAff_transformation_2(m11, m12, m13,
                            m21, m22, m23,
                                      w)
  {}

  Aff_transformation_2(const RT & m11, const RT & m12,
                       const RT & m21, const RT & m22,
                       const RT &w = RT(1))
    : RAff_transformation_2(m11, m12,
                            m21, m22,
                                      w)
  {}
};

#ifndef CGAL_NO_OSTREAM_INSERT_AFF_TRANSFORMATION_2
template < class R >
std::ostream &
operator<<(std::ostream &os, const CGAL::Aff_transformation_2<R> &t)
{
  typedef typename R::Kernel_base::Aff_transformation_2  RAff_transformation_2;
  return os << static_cast<const RAff_transformation_2&>(t);
}
#endif // CGAL_NO_OSTREAM_INSERT_AFF_TRANSFORMATION_2

#ifndef CGAL_NO_ISTREAM_EXTRACT_AFF_TRANSFORMATION_2
template < class R >
std::istream &
operator>>(std::istream &is, CGAL::Aff_transformation_2<R> &t)
{
  typedef typename R::Kernel_base::Aff_transformation_2  RAff_transformation_2;
  return is >> static_cast<RAff_transformation_2&>(t);
}
#endif // CGAL_NO_ISTREAM_EXTRACT_AFF_TRANSFORMATION_2

} //namespace CGAL

#endif // CGAL_AFF_TRANSFORMATION_2_H
