mirror of https://github.com/CGAL/cgal
277 lines
6.5 KiB
C++
277 lines
6.5 KiB
C++
// Copyright (c) 1999 Utrecht University (The Netherlands),
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// ETH Zurich (Switzerland), Freie Universitaet Berlin (Germany),
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// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
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// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
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// and Tel-Aviv University (Israel). All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; version 2.1 of the License.
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// See the file LICENSE.LGPL distributed with CGAL.
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//
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// Licensees holding a valid commercial license may use this file in
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// accordance with the commercial license agreement provided with the software.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $URL$
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// $Id$
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//
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//
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// Author(s) : Stefan Schirra
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#ifndef CGAL_DIRECTION_2_H
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#define CGAL_DIRECTION_2_H
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#include <boost/static_assert.hpp>
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#include <boost/type_traits.hpp>
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#include <CGAL/Kernel/Return_base_tag.h>
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CGAL_BEGIN_NAMESPACE
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template <class R_>
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class Direction_2 : public R_::Kernel_base::Direction_2
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{
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typedef typename R_::RT RT;
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typedef typename R_::Vector_2 Vector_2;
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typedef typename R_::Line_2 Line_2;
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typedef typename R_::Ray_2 Ray_2;
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typedef typename R_::Segment_2 Segment_2;
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typedef typename R_::Aff_transformation_2 Aff_transformation_2;
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typedef typename R_::Kernel_base::Direction_2 RDirection_2;
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typedef Direction_2 Self;
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BOOST_STATIC_ASSERT((boost::is_same<Self, typename R_::Direction_2>::value));
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public:
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typedef RDirection_2 Rep;
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const Rep& rep() const
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{
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return *this;
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}
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Rep& rep()
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{
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return *this;
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}
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typedef R_ R;
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Direction_2() {}
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Direction_2(const RDirection_2& d)
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: RDirection_2(d) {}
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Direction_2(const Vector_2& v)
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: RDirection_2(typename R::Construct_direction_2()(Return_base_tag(), v)) {}
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Direction_2(const Line_2& l)
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: RDirection_2(typename R::Construct_direction_2()(Return_base_tag(), l)) {}
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Direction_2(const Ray_2& r)
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: RDirection_2(typename R::Construct_direction_2()(Return_base_tag(), r)) {}
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Direction_2(const Segment_2& s)
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: RDirection_2(typename R::Construct_direction_2()(Return_base_tag(), s)) {}
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Direction_2(const RT &x, const RT &y)
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: RDirection_2(typename R::Construct_direction_2()(Return_base_tag(), x,y)) {}
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bool
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counterclockwise_in_between(const Direction_2 &d1,
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const Direction_2 &d2) const
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{
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return R().counterclockwise_in_between_2_object()(*this, d1, d2);
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}
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Direction_2 perpendicular(const Orientation &o) const
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{
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return R().construct_perpendicular_direction_2_object()(*this,o);
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}
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typename Qualified_result_of<typename R::Compute_dx_2, Direction_2>::type
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dx() const
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{
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return R().compute_dx_2_object()(*this);
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}
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typename Qualified_result_of<typename R::Compute_dy_2, Direction_2>::type
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dy() const
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{
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return R().compute_dy_2_object()(*this);
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}
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typename Qualified_result_of<typename R::Compute_dx_2, Direction_2>::type
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delta(int i) const
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{
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CGAL_kernel_precondition( ( i == 0 ) || ( i == 1 ) );
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return (i==0) ? dx() : dy();
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}
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bool
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operator<(const Direction_2 &d) const
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{
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return R().compare_angle_with_x_axis_2_object()(*this, d) == SMALLER;
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}
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bool
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operator>(const Direction_2 &d) const
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{
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return d < *this;
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}
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bool
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operator>=(const Direction_2 &d) const
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{
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return R().compare_angle_with_x_axis_2_object()(*this, d) != SMALLER;
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}
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bool
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operator<=(const Direction_2 &d) const
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{
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return R().compare_angle_with_x_axis_2_object()(*this, d) != LARGER;
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}
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Direction_2
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operator-() const
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{
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return R().construct_opposite_direction_2_object()(*this);
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}
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Vector_2 vector() const
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{
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return R().construct_vector_2_object()(*this);
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}
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Vector_2 to_vector() const
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{
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return this->vector();
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}
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bool
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operator==(const Direction_2& d) const
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{
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return R().equal_2_object()(*this, d);
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}
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bool
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operator!=(const Direction_2& d) const
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{
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return !(*this == d);
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}
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Direction_2 transform(const Aff_transformation_2 &t) const
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{
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return t.transform(*this);
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}
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};
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template <class R >
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std::ostream&
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insert(std::ostream& os, const Direction_2<R>& d, const Cartesian_tag&)
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{
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typename R::Vector_2 v = d.to_vector();
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switch(os.iword(IO::mode)) {
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case IO::ASCII :
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return os << v.x() << ' ' << v.y();
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case IO::BINARY :
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write(os, v.x());
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write(os, v.y());
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return os;
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default:
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return os << "DirectionC2(" << v.x() << ", " << v.y() << ')';
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}
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}
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template <class R >
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std::ostream&
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insert(std::ostream& os, const Direction_2<R>& d, const Homogeneous_tag&)
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{
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switch(os.iword(IO::mode))
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{
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case IO::ASCII :
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return os << d.dx() << ' ' << d.dy();
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case IO::BINARY :
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write(os, d.dx());
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write(os, d.dy());
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return os;
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default:
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return os << "DirectionH2(" << d.dx() << ", "
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<< d.dy() << ')';
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}
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}
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template < class R >
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std::ostream&
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operator<<(std::ostream& os, const Direction_2<R>& d)
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{
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return insert(os, d, typename R::Kernel_tag() );
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}
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template <class R >
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std::istream&
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extract(std::istream& is, Direction_2<R>& d, const Cartesian_tag&)
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{
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typename R::FT x, y;
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switch(is.iword(IO::mode)) {
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case IO::ASCII :
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is >> x >> y;
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break;
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case IO::BINARY :
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read(is, x);
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read(is, y);
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break;
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default:
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std::cerr << std::endl << "Stream must be in ascii or binary mode"
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<< std::endl;
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break;
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}
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if (is)
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d = Direction_2<R>(x, y);
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return is;
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}
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template <class R >
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std::istream&
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extract(std::istream& is, Direction_2<R>& d, const Homogeneous_tag&)
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{
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typename R::RT x, y;
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switch(is.iword(IO::mode))
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{
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case IO::ASCII :
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is >> x >> y;
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break;
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case IO::BINARY :
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read(is, x);
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read(is, y);
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break;
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default:
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std::cerr << "" << std::endl;
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std::cerr << "Stream must be in ascii or binary mode" << std::endl;
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break;
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}
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d = Direction_2<R>(x, y);
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return is;
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}
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template < class R >
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std::istream&
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operator>>(std::istream& is, Direction_2<R>& d)
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{
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return extract(is, d, typename R::Kernel_tag() );
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}
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CGAL_END_NAMESPACE
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#endif // CGAL_DIRECTION_2_H
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