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// Copyright (c) 2000
// 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)
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1.1/Cartesian_kernel/include/CGAL/Cartesian/Scaling_rep_2.h $
// $Id: include/CGAL/Cartesian/Scaling_rep_2.h 08b27d3db14 $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s) : Herve Bronnimann
#ifndef CGAL_CARTESIAN_SCALING_REP_2_H
#define CGAL_CARTESIAN_SCALING_REP_2_H
namespace CGAL {
template < class R >
class Scaling_repC2: public Aff_transformation_rep_baseC2<R>
{
friend class Aff_transformation_repC2<R>;
friend class Translation_repC2<R>;
friend class Rotation_repC2<R>;
friend class Reflection_repC2<R>;
public:
typedef Aff_transformation_rep_baseC2<R> Aff_t_base;
typedef typename Aff_t_base::FT FT;
typedef typename Aff_t_base::Point_2 Point_2;
typedef typename Aff_t_base::Vector_2 Vector_2;
typedef typename Aff_t_base::Direction_2 Direction_2;
typedef typename Aff_t_base::Aff_transformation_2 Aff_transformation_2;
typedef Aff_transformation_repC2<R> Transformation;
typedef Translation_repC2<R> Translation;
typedef Rotation_repC2<R> Rotation;
typedef Reflection_repC2<R> Reflection;
typedef Scaling_repC2<R> Scaling;
Scaling_repC2()
{}
Scaling_repC2(const FT &scalefactor) :
scalefactor_(scalefactor)
{}
~Scaling_repC2()
{}
Point_2 transform(const Point_2 &p) const
{
return Point_2(scalefactor_ * p.x(), scalefactor_ * p.y());
}
Vector_2 transform(const Vector_2 &p) const
{
return Vector_2(scalefactor_ * p.x(), scalefactor_ * p.y());
}
Direction_2 transform(const Direction_2 &d) const
{
return d;
}
Aff_transformation_2 operator*(const Aff_t_base &t) const
{
return t.compose(*this);
}
Aff_transformation_2 compose(const Translation &t) const
{
FT ft0(0);
return Aff_transformation_2(scalefactor_,
ft0,
t.translationvector_.x(),
ft0,
scalefactor_,
t.translationvector_.y());
}
Aff_transformation_2 compose(const Rotation &t) const
{
return Aff_transformation_2(scalefactor_ * t.cosinus_,
scalefactor_ * -t.sinus_,
scalefactor_ * t.sinus_,
scalefactor_ * t.cosinus_);
}
Aff_transformation_2 compose(const Reflection &r) const
{
return Aff_transformation_2(scalefactor_*r.cosinus_, scalefactor_*r.sinus_,-r.cosinus_*r.t.x()-r.sinus_*r.t.y()+r.t.x(),
scalefactor_*r.sinus_, -scalefactor_*r.cosinus_, -r.sinus_*r.t.x()+r.cosinus_*r.t.y()-r.t.y());
}
Aff_transformation_2 compose(const Scaling &t) const
{
return Aff_transformation_2(SCALING, scalefactor_*t.scalefactor_);
}
Aff_transformation_2 compose(const Transformation &t) const
{
return Aff_transformation_2(scalefactor_ * t.t11,
scalefactor_ * t.t12,
t.t13,
scalefactor_ * t.t21,
scalefactor_ * t.t22,
t.t23);
}
Aff_transformation_2 inverse() const
{
return Aff_transformation_2(SCALING, FT(1)/scalefactor_);
}
bool is_even() const
{
return true;
}
bool is_scaling() const
{
return true;
}
FT cartesian(int i, int j) const
{
if (i!=j) return FT(0);
return (i==2) ? FT(1) : scalefactor_;
}
std::ostream &print(std::ostream &os) const
{
os << "Aff_transformationC2(" << scalefactor_ << ")";
return os;
}
private:
FT scalefactor_;
};
} //namespace CGAL
#endif // CGAL_CARTESIAN_SCALING_REP_2_H
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