mirror of https://github.com/CGAL/cgal
274 lines
7.4 KiB
C++
274 lines
7.4 KiB
C++
// ======================================================================
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//
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// Copyright (c) 2000 The CGAL Consortium
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//
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// This software and related documentation is part of an INTERNAL release
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// of the Computational Geometry Algorithms Library (CGAL). It is not
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// intended for general use.
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//
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// ----------------------------------------------------------------------
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//
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// release :
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// release_date :
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//
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// file : include/CGAL/Cartesian/Direction_2.h
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// revision : $Revision$
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// revision_date : $Date$
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// author(s) : Andreas Fabri, Herve Bronnimann
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// coordinator : INRIA Sophia-Antipolis (Mariette.Yvinec@sophia.inria.fr)
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//
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// ======================================================================
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#ifndef CGAL_CARTESIAN_DIRECTION_2_H
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#define CGAL_CARTESIAN_DIRECTION_2_H
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#include <CGAL/Cartesian/redefine_names_2.h>
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CGAL_BEGIN_NAMESPACE
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template < class R_ >
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class DirectionC2 CGAL_ADVANCED_KERNEL_PARTIAL_SPEC
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: public R_::Direction_handle_2
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{
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public:
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typedef R_ R;
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typedef typename R::FT FT;
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typedef typename R::RT RT;
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typedef typename R::Direction_handle_2 Direction_handle_2;
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typedef typename R::Direction_ref_2 Direction_ref_2;
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#ifndef CGAL_CFG_NO_ADVANCED_KERNEL
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typedef DirectionC2<R,Cartesian_tag> Self;
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typedef typename R::Point_2 Point_2;
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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::Triangle_2 Triangle_2;
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typedef typename R::Segment_2 Segment_2;
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typedef typename R::Iso_rectangle_2 Iso_rectangle_2;
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typedef typename R::Aff_transformation_2 Aff_transformation_2;
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typedef typename R::Circle_2 Circle_2;
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#else
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typedef DirectionC2<R> Self;
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typedef typename R::Point_2_base Point_2;
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typedef typename R::Vector_2_base Vector_2;
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typedef typename R::Line_2_base Line_2;
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typedef typename R::Ray_2_base Ray_2;
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typedef typename R::Triangle_2_base Triangle_2;
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typedef typename R::Segment_2_base Segment_2;
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typedef typename R::Iso_rectangle_2_base Iso_rectangle_2;
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typedef typename R::Aff_transformation_2_base Aff_transformation_2;
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typedef typename R::Circle_2_base Circle_2;
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#endif
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DirectionC2();
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DirectionC2(const Vector_2 &v);
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DirectionC2(const FT &x, const FT &y);
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bool operator==(const Self &d) const;
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bool operator!=(const Self &d) const;
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bool operator>=(const Self &d) const;
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bool operator<=(const Self &d) const;
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bool operator>(const Self &d) const;
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bool operator<(const Self &d) const;
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bool counterclockwise_in_between( const Self &d1, const Self &d2) const;
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Vector_2 to_vector() const;
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Self perpendicular(const Orientation &o) const;
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Self transform(const Aff_transformation_2 &t) const;
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Self operator-() const;
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FT delta(int i) const;
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FT dx() const
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{
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return Ptr()->e0;
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}
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FT dy() const
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{
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return Ptr()->e1;
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}
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};
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template < class R >
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CGAL_KERNEL_CTOR_INLINE
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DirectionC2<R CGAL_CTAG>::DirectionC2()
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: Direction_handle_2(Direction_ref_2()) {}
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template < class R >
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CGAL_KERNEL_CTOR_INLINE
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DirectionC2<R CGAL_CTAG>::
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DirectionC2(const typename DirectionC2<R CGAL_CTAG>::Vector_2 &v)
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: Direction_handle_2(v) {}
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template < class R >
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CGAL_KERNEL_CTOR_INLINE
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DirectionC2<R CGAL_CTAG>::
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DirectionC2(const typename DirectionC2<R CGAL_CTAG>::FT &x,
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const typename DirectionC2<R CGAL_CTAG>::FT &y)
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: Direction_handle_2(Direction_ref_2(x, y)) {}
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template < class R >
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inline
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bool
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DirectionC2<R CGAL_CTAG>::operator==(const DirectionC2<R CGAL_CTAG> &d) const
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{
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if ( identical(d) ) return true;
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return equal_direction(*this, d);
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}
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template < class R >
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inline
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bool
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DirectionC2<R CGAL_CTAG>::operator!=(const DirectionC2<R CGAL_CTAG> &d) const
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{
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return !( *this == d );
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}
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template < class R >
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CGAL_KERNEL_MEDIUM_INLINE
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bool
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DirectionC2<R CGAL_CTAG>::operator<(const DirectionC2<R CGAL_CTAG> &d) const
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{
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return compare_angle_with_x_axis(*this,d) == SMALLER;
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}
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template < class R >
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CGAL_KERNEL_INLINE
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bool
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DirectionC2<R CGAL_CTAG>::operator>(const DirectionC2<R CGAL_CTAG> &d) const
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{
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return d < *this;
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}
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template < class R >
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CGAL_KERNEL_INLINE
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bool
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DirectionC2<R CGAL_CTAG>::operator>=(const DirectionC2<R CGAL_CTAG> &d) const
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{
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return compare_angle_with_x_axis(*this,d) != SMALLER;
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}
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template < class R >
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CGAL_KERNEL_INLINE
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bool
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DirectionC2<R CGAL_CTAG>::operator<=(const DirectionC2<R CGAL_CTAG> &d) const
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{
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return compare_angle_with_x_axis(*this,d) != LARGER;
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}
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template < class R >
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CGAL_KERNEL_INLINE
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bool
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DirectionC2<R CGAL_CTAG>::
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counterclockwise_in_between(const DirectionC2<R CGAL_CTAG> &d1,
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const DirectionC2<R CGAL_CTAG> &d2) const
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// returns true, iff \ccVar\ is not equal to \ccc{d1}, and
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// while rotating counterclockwise starting at \ccc{d1},
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// \ccVar\ is reached strictly before \ccc{d2} is reached.
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// Note that true is returned if \ccc{d1} == \ccc{d2}, unless
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// also \ccVar\ == \ccc{d1}.
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{
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if ( d1 < *this)
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return ( *this < d2 )||( d2 <= d1 );
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else
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return ( *this < d2 )&&( d2 <= d1 );
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}
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template < class R >
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inline
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typename DirectionC2<R CGAL_CTAG>::Vector_2
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DirectionC2<R CGAL_CTAG>::to_vector() const
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{
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return Vector_2(*this);
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}
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template < class R >
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CGAL_KERNEL_MEDIUM_INLINE
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DirectionC2<R CGAL_CTAG>
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DirectionC2<R CGAL_CTAG>::perpendicular(const Orientation &o) const
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{
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CGAL_kernel_precondition(o != COLLINEAR);
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if (o == COUNTERCLOCKWISE)
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return DirectionC2<R CGAL_CTAG>(-dy(), dx());
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else
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return DirectionC2<R CGAL_CTAG>(dy(), -dx());
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}
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template < class R >
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CGAL_KERNEL_INLINE
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DirectionC2<R CGAL_CTAG>
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DirectionC2<R CGAL_CTAG>::
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transform(const typename DirectionC2<R CGAL_CTAG>::Aff_transformation_2 &t)
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const
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{
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return t.transform(*this);
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}
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template < class R >
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inline
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DirectionC2<R CGAL_CTAG>
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DirectionC2<R CGAL_CTAG>::operator-() const
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{
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return DirectionC2<R CGAL_CTAG>(-dx(), -dy());
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}
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template < class R >
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CGAL_KERNEL_INLINE
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typename DirectionC2<R CGAL_CTAG>::FT
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DirectionC2<R CGAL_CTAG>::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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#ifndef CGAL_NO_OSTREAM_INSERT_DIRECTIONC2
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template < class R >
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std::ostream&
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operator<<(std::ostream &os, const DirectionC2<R CGAL_CTAG> &d)
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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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#endif // CGAL_NO_OSTREAM_INSERT_DIRECTIONC2
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#ifndef CGAL_NO_ISTREAM_EXTRACT_DIRECTIONC2
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template < class R >
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std::istream&
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operator>>(std::istream &is, DirectionC2<R CGAL_CTAG> &p)
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{
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typename DirectionC2<R CGAL_CTAG>::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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p = DirectionC2<R CGAL_CTAG>(x, y);
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return is;
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}
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#endif // CGAL_NO_ISTREAM_EXTRACT_DIRECTIONC2
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CGAL_END_NAMESPACE
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#endif // CGAL_CARTESIAN_DIRECTION_2_H
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