mirror of https://github.com/CGAL/cgal
152 lines
4.1 KiB
C++
152 lines
4.1 KiB
C++
// ============================================================================
|
|
//
|
|
// Copyright (c) 2000 The CGAL Consortium
|
|
//
|
|
// This software and related documentation is part of an INTERNAL release
|
|
// of the Computational Geometry Algorithms Library (CGAL). It is not
|
|
// intended for general use.
|
|
//
|
|
// ----------------------------------------------------------------------------
|
|
//
|
|
// release : $CGAL_Revision $
|
|
// release_date : $CGAL_Date $
|
|
//
|
|
// file : include/CGAL/Partition_traits_2_base.h
|
|
// package : $CGAL_Package: Partition_2 $
|
|
// maintainer : Susan Hert <hert@mpi-sb.mpg.de>
|
|
// chapter : Planar Polygon Partitioning
|
|
//
|
|
// revision : $Revision$
|
|
// revision_date : $Date$
|
|
//
|
|
// author(s) : Susan Hert <hert@mpi-sb.mpg.de>
|
|
//
|
|
// coordinator : MPI (Susan Hert <hert@mpi-sb.mpg.de>)
|
|
//
|
|
// implementation: Base class for polygon partitioning function traits classes
|
|
// ============================================================================
|
|
|
|
#ifndef PARTITION_TRAITS_2_BASE_H
|
|
#define PARTITION_TRAITS_2_BASE_H
|
|
|
|
#include <CGAL/Polygon_2.h>
|
|
#include <CGAL/Polygon_traits_2.h>
|
|
#include <list>
|
|
|
|
namespace CGAL {
|
|
|
|
template <class R_>
|
|
class Partition_traits_2_base
|
|
{
|
|
public:
|
|
typedef R_ R;
|
|
typedef CGAL::Polygon_traits_2<R> Poly_Traits;
|
|
typedef typename Poly_Traits::Point_2 Point_2;
|
|
typedef ::std::list<Point_2> Container;
|
|
typedef CGAL::Polygon_2<Poly_Traits, Container> Polygon_2;
|
|
typedef typename R::Less_yx_2 Less_yx_2;
|
|
typedef typename R::Less_xy_2 Less_xy_2;
|
|
typedef typename R::Leftturn_2 Leftturn_2;
|
|
typedef typename R::Orientation_2 Orientation_2;
|
|
typedef typename R::Compare_y_2 Compare_y_2;
|
|
typedef typename R::Compare_x_2 Compare_x_2;
|
|
|
|
// needed below for do_intersect
|
|
typedef typename R::Segment_2 Segment_2;
|
|
|
|
Less_yx_2
|
|
less_yx_2_object() const
|
|
{ return Less_yx_2(); }
|
|
|
|
Less_xy_2
|
|
less_xy_2_object() const
|
|
{ return Less_xy_2(); }
|
|
|
|
Leftturn_2
|
|
leftturn_2_object() const
|
|
{ return Leftturn_2(); }
|
|
|
|
Orientation_2
|
|
orientation_2_object() const
|
|
{ return Orientation_2(); }
|
|
|
|
Compare_y_2
|
|
compare_y_2_object() const
|
|
{ return Compare_y_2(); }
|
|
|
|
Compare_x_2
|
|
compare_x_2_object() const
|
|
{ return Compare_x_2(); }
|
|
|
|
|
|
// Needed for Polygon_algorithms_2 without the _2
|
|
typedef typename R::Less_xy_2 Less_xy;
|
|
|
|
// Needed for simplicity and CCW order precondition checking
|
|
// ----------
|
|
typedef typename Poly_Traits::Vector_2 Vector_2;
|
|
typedef typename R::FT FT;
|
|
|
|
typedef typename R::Direction_2 Direction_2;
|
|
|
|
Comparison_result
|
|
compare_x(const Point_2 &p, const Point_2 &q) const
|
|
{
|
|
return Compare_x_2()(p, q);
|
|
}
|
|
|
|
Comparison_result
|
|
compare_y(const Point_2 &p, const Point_2 &q) const
|
|
{
|
|
return Compare_y_2()(p, q);
|
|
}
|
|
|
|
|
|
FT
|
|
cross_product_2(const Vector_2& p, const Vector_2& q) const
|
|
{
|
|
return p.x() * q.y() - q.x() * p.y();
|
|
}
|
|
|
|
bool
|
|
do_intersect(const Point_2& p1, const Point_2& q1, const Point_2& p2,
|
|
const Point_2& q2) const
|
|
{
|
|
return ::CGAL::do_intersect(Segment_2(p1,q1), Segment_2(p2,q2));
|
|
}
|
|
|
|
bool
|
|
have_equal_direction(const Vector_2& v1, const Vector_2& v2) const
|
|
{
|
|
return Direction_2(v1) == Direction_2(v2);
|
|
}
|
|
|
|
bool
|
|
is_negative(const FT& x) const
|
|
{
|
|
return CGAL_NTS is_negative(x);
|
|
}
|
|
|
|
// necessary for precondition checking
|
|
bool
|
|
lexicographically_yx_smaller_or_equal(const Point_2& p,
|
|
const Point_2& q) const
|
|
{
|
|
return ::CGAL::lexicographically_yx_smaller_or_equal(p,q);
|
|
}
|
|
// ----------
|
|
|
|
// necessary for postcondition and precondition checking
|
|
::CGAL::Orientation
|
|
orientation(const Point_2& p, const Point_2& q, const Point_2& r) const
|
|
{
|
|
return Orientation_2()(p,q,r);
|
|
}
|
|
|
|
|
|
};
|
|
|
|
}
|
|
|
|
#endif // PARTITION_TRAITS_2_BASE_H
|