/usr/include/CGAL/Splitters.h is in libcgal-dev 4.2-5ubuntu1.
This file is owned by root:root, with mode 0o644.
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// 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.
//
// $URL$
// $Id$
//
//
// Author(s) : Hans Tangelder (<hanst@cs.uu.nl>)
// Defines rules used for constructing a split node. That is, it implements,
// in several ways, the concept
// Boxtree_splitter<FT>.
#ifndef CGAL_SPLITTERS_H
#define CGAL_SPLITTERS_H
#include <CGAL/Point_container.h>
#include <CGAL/Plane_separator.h>
namespace CGAL {
template <class FT>
class Splitter_base {
private:
unsigned int the_bucket_size;
FT the_aspect_ratio;
public:
Splitter_base(unsigned int bucket_size = 3,
FT aspect_ratio = FT(3))
: the_bucket_size(bucket_size),
the_aspect_ratio(aspect_ratio)
{}
FT
aspect_ratio() const
{
return the_aspect_ratio;
}
unsigned int
bucket_size() const
{
return the_bucket_size;
}
};
template <class SearchTraits,
class Separator_= Plane_separator<typename SearchTraits::FT> >
class Median_of_max_spread
: public Splitter_base<typename SearchTraits::FT>
{
typedef Splitter_base<typename SearchTraits::FT> Base;
public:
typedef typename SearchTraits::FT FT;
typedef Point_container<SearchTraits> Container;
typedef Separator_ Separator;
Median_of_max_spread()
: Base()
{}
Median_of_max_spread(unsigned int bucket_size)
: Base(bucket_size)
{}
void
operator() (Separator& sep,
Container& c0,
Container& c1) const
{
sep=Separator(c0.max_tight_span_coord(),FT(0));
sep.set_cutting_value(c0.median(sep.cutting_dimension()));
c0.split(c1,sep,true);
}
};
template <class SearchTraits,
class Separator_= Plane_separator<typename SearchTraits::FT> >
class Fair
: public Splitter_base<typename SearchTraits::FT>
{
typedef Splitter_base<typename SearchTraits::FT> Base;
public:
typedef typename SearchTraits::FT FT;
typedef Point_container<SearchTraits> Container;
typedef Separator_ Separator;
Fair()
: Base()
{}
Fair(unsigned int bucket_size,
FT aspect_ratio=FT(3))
: Base(bucket_size, aspect_ratio)
{}
void
operator()(Separator& sep, Container& c0, Container& c1) const
{
// find legal cut with max spread
sep=Separator(c0.max_tight_span_coord_balanced(this->aspect_ratio()),
FT(0));
sep.set_cutting_value(c0.balanced_fair(sep.cutting_dimension(),
this->aspect_ratio()));
c0.split(c1,sep);
}
};
template <class SearchTraits,
class Separator_= Plane_separator<typename SearchTraits::FT> >
class Sliding_fair
: public Splitter_base<typename SearchTraits::FT>
{
typedef Splitter_base<typename SearchTraits::FT> Base;
public:
typedef typename SearchTraits::FT FT;
typedef Point_container<SearchTraits> Container;
typedef Separator_ Separator;
Sliding_fair()
: Base()
{}
Sliding_fair(unsigned int bucket_size,
FT aspect_ratio=FT(3))
: Base(bucket_size, aspect_ratio)
{}
void
operator() (Separator& sep, Container& c0, Container& c1) const
{
// find legal cut with max spread
sep = Separator(c0.max_tight_span_coord_balanced(this->aspect_ratio()),
FT(0));
sep.set_cutting_value(c0.balanced_sliding_fair(sep.cutting_dimension(),
this->aspect_ratio()));
c0.split(c1,sep,true);
}
};
template <class SearchTraits,
class Separator_= Plane_separator<typename SearchTraits::FT> >
class Sliding_midpoint
: public Splitter_base<typename SearchTraits::FT>
{
typedef Splitter_base<typename SearchTraits::FT> Base;
public:
typedef typename SearchTraits::FT FT;
typedef Point_container<SearchTraits> Container;
typedef Separator_ Separator;
Sliding_midpoint()
: Base()
{}
Sliding_midpoint(unsigned int bucket_size)
: Base(bucket_size)
{}
void
operator()(Separator& sep, Container& c0, Container& c1) const
{
CGAL_assertion(c0.is_valid());
CGAL_assertion(c1.is_valid());
sep = Separator(c0.max_span_coord(),
(c0.max_span_upper() + c0.max_span_lower())/FT(2));
FT max_span_lower =
c0.tight_bounding_box().min_coord(c0.max_span_coord());
CGAL_assertion(max_span_lower >= c0.max_span_lower());
FT max_span_upper =
c0.tight_bounding_box().max_coord(c0.max_span_coord());
CGAL_assertion(max_span_upper <= c0.max_span_upper());
if (max_span_upper <= sep.cutting_value()) {
sep.set_cutting_value(max_span_upper);
};
if (max_span_lower >= sep.cutting_value()) {
sep.set_cutting_value(max_span_lower);
};
c0.split(c1,sep,true);
}
};
template <class SearchTraits,
class Separator_= Plane_separator<typename SearchTraits::FT> >
class Median_of_rectangle
: public Splitter_base<typename SearchTraits::FT>
{
typedef Splitter_base<typename SearchTraits::FT> Base;
public:
typedef typename SearchTraits::FT FT;
typedef Point_container<SearchTraits> Container;
typedef Separator_ Separator;
Median_of_rectangle()
: Base()
{}
Median_of_rectangle(unsigned int bucket_size)
: Base(bucket_size)
{}
void
operator() (Separator& sep, Container& c0, Container& c1) const
{
sep = Separator(c0.max_span_coord(),FT(0));
sep.set_cutting_value(c0.median(sep.cutting_dimension()));
c0.split(c1,sep,true);
}
};
template <class SearchTraits,
class Separator_= Plane_separator<typename SearchTraits::FT> >
class Midpoint_of_max_spread
: public Splitter_base<typename SearchTraits::FT>
{
typedef Splitter_base<typename SearchTraits::FT> Base;
public:
typedef typename SearchTraits::FT FT;
typedef Point_container<SearchTraits> Container;
typedef Separator_ Separator;
Midpoint_of_max_spread()
: Base()
{}
Midpoint_of_max_spread(unsigned int bucket_size)
: Base(bucket_size)
{}
void
operator()(Separator& sep, Container& c0, Container& c1) const
{
sep = Separator(c0.max_tight_span_coord(),
(c0.max_tight_span_upper() + c0.max_tight_span_lower())/FT(2));
c0.split(c1,sep);
}
};
template <class SearchTraits,
class Separator_= Plane_separator<typename SearchTraits::FT> >
class Midpoint_of_rectangle
: public Splitter_base<typename SearchTraits::FT>
{
typedef Splitter_base<typename SearchTraits::FT> Base;
public:
typedef typename SearchTraits::FT FT;
typedef Point_container<SearchTraits> Container;
typedef Separator_ Separator;
Midpoint_of_rectangle()
: Base()
{}
Midpoint_of_rectangle(unsigned int bucket_size)
: Base(bucket_size)
{}
void
operator()(Separator& sep, Container& c0, Container& c1) const
{
sep = Separator(c0.max_span_coord(),
(c0.max_span_upper() + c0.max_span_lower())/FT(2));
c0.split(c1,sep);
}
};
} // namespace CGAL
#endif // CGAL_SPLITTERS
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