325 lines
13 KiB
C++
Executable File
325 lines
13 KiB
C++
Executable File
// Copyright (c) 2007,2008,2009,2010,2011 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
|
|
// 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.
|
|
//
|
|
// $URL$
|
|
// $Id$
|
|
// SPDX-License-Identifier: GPL-3.0+
|
|
//
|
|
//
|
|
// Author(s) : Idit Haran <haranidi@post.tau.ac.il>
|
|
// Ron Wein <wein@post.tau.ac.il>
|
|
|
|
#ifndef CGAL_ARR_LANDMARKS_POINT_LOCATION_H
|
|
#define CGAL_ARR_LANDMARKS_POINT_LOCATION_H
|
|
|
|
#include <CGAL/license/Arrangement_on_surface_2.h>
|
|
|
|
#include <CGAL/disable_warnings.h>
|
|
|
|
/*! \file
|
|
* Definition of the Arr_landmarks_point_location<Arrangement> template.
|
|
*/
|
|
|
|
//#define CGAL_DEBUG_LM
|
|
|
|
#include <CGAL/Arr_point_location_result.h>
|
|
#include <CGAL/Arrangement_2/Arr_traits_adaptor_2.h>
|
|
#include <CGAL/Arr_point_location/Arr_lm_vertices_generator.h>
|
|
|
|
#include <set>
|
|
|
|
namespace CGAL {
|
|
|
|
/*! \class Arr_landmarks_point_location
|
|
* A class that answers point-location queries on an arrangement using the
|
|
* landmarks algorithm, namely by locating the (approximately) nearest
|
|
* landmark point to the qury point and walking from it toward the query
|
|
* point.
|
|
* This class-template has two parameters:
|
|
* Arrangement corresponds to an arrangement-on-surface instantiation.
|
|
* Generator is a class that generates the set of landmarks.
|
|
*/
|
|
|
|
template <class Arrangement_,
|
|
class Generator_ = Arr_landmarks_vertices_generator<Arrangement_> >
|
|
class Arr_landmarks_point_location
|
|
{
|
|
public:
|
|
typedef Arrangement_ Arrangement_2;
|
|
typedef typename Arrangement_2::Geometry_traits_2 Geometry_traits_2;
|
|
typedef Generator_ Generator;
|
|
|
|
typedef typename Arrangement_2::Vertex_const_handle Vertex_const_handle;
|
|
typedef typename Arrangement_2::Halfedge_const_handle Halfedge_const_handle;
|
|
typedef typename Arrangement_2::Face_const_handle Face_const_handle;
|
|
|
|
typedef typename Arrangement_2::Vertex_const_iterator Vertex_const_iterator;
|
|
typedef typename Arrangement_2::Halfedge_const_iterator
|
|
Halfedge_const_iterator;
|
|
typedef typename Arrangement_2::Halfedge_around_vertex_const_circulator
|
|
Halfedge_around_vertex_const_circulator;
|
|
typedef typename Arrangement_2::Ccb_halfedge_const_circulator
|
|
Ccb_halfedge_const_circulator;
|
|
typedef typename Arrangement_2::Outer_ccb_const_iterator
|
|
Outer_ccb_const_iterator;
|
|
typedef typename Arrangement_2::Inner_ccb_const_iterator
|
|
Inner_ccb_const_iterator;
|
|
typedef typename Arrangement_2::Isolated_vertex_const_iterator
|
|
Isolated_vertex_const_iterator;
|
|
|
|
typedef typename Arrangement_2::Point_2 Point_2;
|
|
typedef typename Arrangement_2::X_monotone_curve_2 X_monotone_curve_2;
|
|
|
|
typedef Arr_point_location_result<Arrangement_2> Result;
|
|
typedef typename Result::Type Result_type;
|
|
|
|
// Support cpp11::result_of
|
|
typedef Result_type result_type;
|
|
|
|
protected:
|
|
typedef Arr_traits_basic_adaptor_2<Geometry_traits_2> Traits_adaptor_2;
|
|
|
|
/*! \struct Less_halfedge_handle
|
|
* Used to sort handles.
|
|
*/
|
|
struct Less_halfedge_handle {
|
|
bool operator()(Halfedge_const_handle h1, Halfedge_const_handle h2) const
|
|
{ return (&(*h1) < &(*h2)); }
|
|
};
|
|
|
|
typedef std::set<Halfedge_const_handle, Less_halfedge_handle> Halfedge_set;
|
|
|
|
// Data members:
|
|
const Arrangement_2* p_arr; // The associated arrangement.
|
|
const Traits_adaptor_2* m_traits; // Its associated traits object.
|
|
Generator* lm_gen; // The associated landmark generator.
|
|
bool own_gen; // Indicates whether the generator
|
|
// has been locally allocated.
|
|
|
|
template<typename T>
|
|
Result_type make_result(T t) const { return Result::make_result(t); }
|
|
inline Result_type default_result() const { return Result::default_result(); }
|
|
|
|
public:
|
|
/*! Default constructor. */
|
|
Arr_landmarks_point_location() :
|
|
p_arr(NULL),
|
|
m_traits(NULL),
|
|
lm_gen(NULL),
|
|
own_gen(false)
|
|
{}
|
|
|
|
/*! Constructor given an arrangement only. */
|
|
Arr_landmarks_point_location(const Arrangement_2& arr) :
|
|
p_arr(&arr),
|
|
m_traits(static_cast<const Traits_adaptor_2*>(p_arr->geometry_traits())),
|
|
lm_gen(new Generator(arr)), // allocate the landmarks generator.
|
|
own_gen(true)
|
|
{ }
|
|
|
|
/*! Constructor given an arrangement, and landmarks generator. */
|
|
Arr_landmarks_point_location(const Arrangement_2& arr, Generator* gen) :
|
|
p_arr(&arr),
|
|
m_traits(static_cast<const Traits_adaptor_2*>(p_arr->geometry_traits())),
|
|
lm_gen(gen),
|
|
own_gen(false)
|
|
{ }
|
|
|
|
/*! Destructor. */
|
|
~Arr_landmarks_point_location()
|
|
{
|
|
if (own_gen) {
|
|
delete lm_gen;
|
|
lm_gen = NULL;
|
|
}
|
|
}
|
|
|
|
/*! Attach an arrangement object (and a generator, if supplied). */
|
|
void attach(const Arrangement_2& arr, Generator* gen = NULL)
|
|
{
|
|
// Keep a pointer to the associated arrangement.
|
|
p_arr = &arr;
|
|
m_traits = static_cast<const Traits_adaptor_2*>(p_arr->geometry_traits());
|
|
|
|
// Update the landmarks generator.
|
|
if (gen != NULL) {
|
|
// In case a generator is given, keep a pointer to it.
|
|
CGAL_assertion(lm_gen == NULL);
|
|
lm_gen = gen;
|
|
own_gen = false;
|
|
}
|
|
else if (lm_gen != NULL) {
|
|
// In case a generator exists internally, make sure it is attached to
|
|
// the given arrangement.
|
|
Arrangement_2& non_const_arr = const_cast<Arrangement_2&>(*p_arr);
|
|
lm_gen->attach(non_const_arr);
|
|
}
|
|
else {
|
|
// Allocate a new generator, attached to the given arrangement.
|
|
lm_gen = new Generator(arr);
|
|
own_gen = true;
|
|
}
|
|
}
|
|
|
|
/*! Detach the instance from the arrangement object. */
|
|
void detach()
|
|
{
|
|
p_arr = NULL;
|
|
m_traits = NULL;
|
|
|
|
CGAL_assertion(lm_gen != NULL);
|
|
if (lm_gen)
|
|
lm_gen->detach();
|
|
}
|
|
|
|
/*!
|
|
* Locate the arrangement feature containing the given point.
|
|
* \param p The query point.
|
|
* \return An object representing the arrangement feature containing the
|
|
* query point. This object is either a Face_const_handle or a
|
|
* Halfedge_const_handle or a Vertex_const_handle.
|
|
*/
|
|
result_type locate(const Point_2& p) const;
|
|
|
|
protected:
|
|
/*! Walk from the given vertex to the query point.
|
|
* \param vh The given vertex handle.
|
|
* \param p The query point.
|
|
* \param crossed_edges In/Out: The set of edges crossed so far.
|
|
* \return An object representing the arrangement feature containing the
|
|
* query point. This object is either a Face_const_handle or a
|
|
* Halfedge_const_handle or a Vertex_const_handle.
|
|
*/
|
|
result_type _walk_from_vertex(Vertex_const_handle vh,
|
|
const Point_2& p,
|
|
Halfedge_set& crossed_edges) const;
|
|
|
|
/*! Locate an edge around a given vertex that is the predecessor of the
|
|
* curve connecting the vertex to the query point in a clockwise order.
|
|
* \param vh The vertex.
|
|
* \param p The query point.
|
|
* \param new_vertex Output: Whether a closer vertex to p was found.
|
|
* \return The desired object (a halfedge handle or a vertex handle).
|
|
*/
|
|
result_type _find_face_around_vertex(Vertex_const_handle vh,
|
|
const Point_2& p,
|
|
bool& new_vertex) const;
|
|
|
|
/*! Walk from a point on a given halfedge to the query point.
|
|
* \param eh The given halfedge handle.
|
|
* \param np The point that the walk starts from.
|
|
* \param p The query point.
|
|
* \param crossed_edges In/Out: The set of edges crossed so far.
|
|
* \return An object representing the arrangement feature containing the
|
|
* query point. This object is either a Face_const_handle or a
|
|
* Halfedge_const_handle or a Vertex_const_handle.
|
|
*/
|
|
result_type _walk_from_edge(Halfedge_const_handle eh,
|
|
const Point_2& np,
|
|
const Point_2& p,
|
|
Halfedge_set& crossed_edges) const;
|
|
/*! In case the arrangement's curve contained in the segment
|
|
* from the nearest landmark to the query point
|
|
* \param he The given halfedge handle.
|
|
* \param p_is_left Is the query point the left endpoint of seg.
|
|
* \param p The query point.
|
|
* \param crossed_edges In/Out: The set of edges crossed so far.
|
|
* \return An object representing the arrangement feature containing the
|
|
* query point. This object is either a Face_const_handle or a
|
|
* Halfedge_const_handle or a Vertex_const_handle.
|
|
*/
|
|
result_type
|
|
_deal_with_curve_contained_in_segment(Halfedge_const_handle he,
|
|
bool p_is_left,
|
|
const Point_2& p,
|
|
Halfedge_set& crossed_edges) const;
|
|
|
|
/*! Walk from a point in a face to the query point.
|
|
* \param fh A halfedge handle that points to the face.
|
|
* \param np The point that the walk starts from.
|
|
* \param p The query point.
|
|
* \param crossed_edges In/Out: The set of edges crossed so far.
|
|
* \return An object representing the arrangement feature containing the
|
|
* query point. This object is either a Face_const_handle or a
|
|
* Halfedge_const_handle or a Vertex_const_handle.
|
|
*/
|
|
result_type _walk_from_face(Face_const_handle fh,
|
|
const Point_2& np,
|
|
const Point_2& p,
|
|
Halfedge_set& crossed_edges) const;
|
|
|
|
/*! Find a halfedge on the given CCB that intersects the given x-monotone
|
|
* curve, connecting the current landmark to the query point.
|
|
* \param circ The CCB circulator.
|
|
* \param seg The segment connecting the landmark and the query point.
|
|
* \param p The query point.
|
|
* \param p_is_left Is the query point the left endpoint of seg.
|
|
* \param crossed_edges In/Out: The set of edges crossed so far.
|
|
* \param is_on_edge Output: Does the query point p lies on the edge.
|
|
* \param is_target Output: Is the query point p equal to the target vertex.
|
|
* \param new_vertex Output: if found a closer vertex to the query point.
|
|
* \param cv_is_contained_in_seg Output: Whether cv is contained inside seg.
|
|
* \return A handle to the halfedge (if no intersecting edge is found, the
|
|
* function returns an ivalid halfedge handle).
|
|
*/
|
|
Halfedge_const_handle
|
|
_intersection_with_ccb(Ccb_halfedge_const_circulator circ,
|
|
const X_monotone_curve_2& seg,
|
|
const Point_2& p,
|
|
bool p_is_left,
|
|
Halfedge_set& crossed_edges,
|
|
bool& is_on_edge,
|
|
bool& is_target,
|
|
bool& cv_is_contained_in_seg,
|
|
Vertex_const_handle& new_vertex) const;
|
|
|
|
/*! Return the halfedge that contains the query point.
|
|
* \param he The halfedge handle.
|
|
* \param crossed_edges In/Out: The set of edges crossed so far.
|
|
* \param p The query point.
|
|
* \param is_target Output: Is the query point p equal to the target vertex.
|
|
*/
|
|
Halfedge_const_handle
|
|
_in_case_p_is_on_edge(Halfedge_const_handle he,
|
|
Halfedge_set& crossed_edges,
|
|
const Point_2& p,
|
|
bool& is_target) const;
|
|
|
|
/*! Check whether the given curve intersects a simple segment, which connects
|
|
* the current landmark to the query point, an odd number of times.
|
|
* \param cv The curve.
|
|
* \param seg The segment connecting the landmark and the query point.
|
|
* \param p_is_left Is the query point the left endpoint of seg.
|
|
* \param p_on_curve Output: Whether p lies on cv.
|
|
* \param cv_and_seg_overlap Output: Whether cv and seg overlap.
|
|
* \param cv_is_contained_in_seg Output: Whether cv is contained inside seg.
|
|
* \return Whether the two curves have an odd number of intersections.
|
|
*/
|
|
bool _have_odd_intersections(const X_monotone_curve_2& cv,
|
|
const X_monotone_curve_2& seg,
|
|
bool p_is_left,
|
|
bool& p_on_curve,
|
|
bool& cv_and_seg_overlap,
|
|
bool& cv_is_contained_in_seg) const;
|
|
};
|
|
|
|
} //namespace CGAL
|
|
|
|
// The member-function definitions can be found under:
|
|
#include <CGAL/Arr_point_location/Arr_landmarks_pl_impl.h>
|
|
|
|
#include <CGAL/enable_warnings.h>
|
|
|
|
#endif
|