293 lines
9.4 KiB
C++
293 lines
9.4 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
|
|
|
|
// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
|
|
// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
|
|
// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
|
|
|
|
// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
|
|
// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
|
|
|
|
// Use, modification and distribution is subject to the Boost Software License,
|
|
// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
|
|
// http://www.boost.org/LICENSE_1_0.txt)
|
|
|
|
#ifndef BOOST_GEOMETRY_ALGORITHMS_BUFFER_HPP
|
|
#define BOOST_GEOMETRY_ALGORITHMS_BUFFER_HPP
|
|
|
|
#include <cstddef>
|
|
|
|
#include <boost/numeric/conversion/cast.hpp>
|
|
|
|
#include <boost/range.hpp>
|
|
|
|
#include <boost/variant/apply_visitor.hpp>
|
|
#include <boost/variant/static_visitor.hpp>
|
|
#include <boost/variant/variant_fwd.hpp>
|
|
|
|
#include <boost/geometry/algorithms/clear.hpp>
|
|
#include <boost/geometry/algorithms/envelope.hpp>
|
|
#include <boost/geometry/algorithms/is_empty.hpp>
|
|
#include <boost/geometry/algorithms/not_implemented.hpp>
|
|
#include <boost/geometry/arithmetic/arithmetic.hpp>
|
|
#include <boost/geometry/geometries/concepts/check.hpp>
|
|
#include <boost/geometry/geometries/box.hpp>
|
|
#include <boost/geometry/util/math.hpp>
|
|
|
|
#include <boost/geometry/algorithms/detail/buffer/buffer_inserter.hpp>
|
|
|
|
namespace boost { namespace geometry
|
|
{
|
|
|
|
|
|
#ifndef DOXYGEN_NO_DETAIL
|
|
namespace detail { namespace buffer
|
|
{
|
|
|
|
template <typename BoxIn, typename BoxOut, typename T, std::size_t C, std::size_t D, std::size_t N>
|
|
struct box_loop
|
|
{
|
|
typedef typename coordinate_type<BoxOut>::type coordinate_type;
|
|
|
|
static inline void apply(BoxIn const& box_in, T const& distance, BoxOut& box_out)
|
|
{
|
|
coordinate_type d = distance;
|
|
set<C, D>(box_out, get<C, D>(box_in) + d);
|
|
box_loop<BoxIn, BoxOut, T, C, D + 1, N>::apply(box_in, distance, box_out);
|
|
}
|
|
};
|
|
|
|
template <typename BoxIn, typename BoxOut, typename T, std::size_t C, std::size_t N>
|
|
struct box_loop<BoxIn, BoxOut, T, C, N, N>
|
|
{
|
|
static inline void apply(BoxIn const&, T const&, BoxOut&) {}
|
|
};
|
|
|
|
// Extends a box with the same amount in all directions
|
|
template<typename BoxIn, typename BoxOut, typename T>
|
|
inline void buffer_box(BoxIn const& box_in, T const& distance, BoxOut& box_out)
|
|
{
|
|
assert_dimension_equal<BoxIn, BoxOut>();
|
|
|
|
static const std::size_t N = dimension<BoxIn>::value;
|
|
|
|
box_loop<BoxIn, BoxOut, T, min_corner, 0, N>::apply(box_in, -distance, box_out);
|
|
box_loop<BoxIn, BoxOut, T, max_corner, 0, N>::apply(box_in, distance, box_out);
|
|
}
|
|
|
|
|
|
|
|
}} // namespace detail::buffer
|
|
#endif // DOXYGEN_NO_DETAIL
|
|
|
|
#ifndef DOXYGEN_NO_DISPATCH
|
|
namespace dispatch
|
|
{
|
|
|
|
template
|
|
<
|
|
typename Input,
|
|
typename Output,
|
|
typename TagIn = typename tag<Input>::type,
|
|
typename TagOut = typename tag<Output>::type
|
|
>
|
|
struct buffer: not_implemented<TagIn, TagOut>
|
|
{};
|
|
|
|
|
|
template <typename BoxIn, typename BoxOut>
|
|
struct buffer<BoxIn, BoxOut, box_tag, box_tag>
|
|
{
|
|
template <typename Distance>
|
|
static inline void apply(BoxIn const& box_in, Distance const& distance,
|
|
Distance const& , BoxOut& box_out)
|
|
{
|
|
detail::buffer::buffer_box(box_in, distance, box_out);
|
|
}
|
|
};
|
|
|
|
} // namespace dispatch
|
|
#endif // DOXYGEN_NO_DISPATCH
|
|
|
|
|
|
namespace resolve_variant {
|
|
|
|
template <typename Geometry>
|
|
struct buffer
|
|
{
|
|
template <typename Distance, typename GeometryOut>
|
|
static inline void apply(Geometry const& geometry,
|
|
Distance const& distance,
|
|
Distance const& chord_length,
|
|
GeometryOut& out)
|
|
{
|
|
dispatch::buffer<Geometry, GeometryOut>::apply(geometry, distance, chord_length, out);
|
|
}
|
|
};
|
|
|
|
template <BOOST_VARIANT_ENUM_PARAMS(typename T)>
|
|
struct buffer<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
|
|
{
|
|
template <typename Distance, typename GeometryOut>
|
|
struct visitor: boost::static_visitor<void>
|
|
{
|
|
Distance const& m_distance;
|
|
Distance const& m_chord_length;
|
|
GeometryOut& m_out;
|
|
|
|
visitor(Distance const& distance,
|
|
Distance const& chord_length,
|
|
GeometryOut& out)
|
|
: m_distance(distance),
|
|
m_chord_length(chord_length),
|
|
m_out(out)
|
|
{}
|
|
|
|
template <typename Geometry>
|
|
void operator()(Geometry const& geometry) const
|
|
{
|
|
buffer<Geometry>::apply(geometry, m_distance, m_chord_length, m_out);
|
|
}
|
|
};
|
|
|
|
template <typename Distance, typename GeometryOut>
|
|
static inline void apply(
|
|
boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry,
|
|
Distance const& distance,
|
|
Distance const& chord_length,
|
|
GeometryOut& out
|
|
)
|
|
{
|
|
boost::apply_visitor(visitor<Distance, GeometryOut>(distance, chord_length, out), geometry);
|
|
}
|
|
};
|
|
|
|
} // namespace resolve_variant
|
|
|
|
|
|
/*!
|
|
\brief \brief_calc{buffer}
|
|
\ingroup buffer
|
|
\details \details_calc{buffer, \det_buffer}.
|
|
\tparam Input \tparam_geometry
|
|
\tparam Output \tparam_geometry
|
|
\tparam Distance \tparam_numeric
|
|
\param geometry_in \param_geometry
|
|
\param geometry_out \param_geometry
|
|
\param distance The distance to be used for the buffer
|
|
\param chord_length (optional) The length of the chord's in the generated arcs around points or bends
|
|
|
|
\qbk{[include reference/algorithms/buffer.qbk]}
|
|
*/
|
|
template <typename Input, typename Output, typename Distance>
|
|
inline void buffer(Input const& geometry_in, Output& geometry_out,
|
|
Distance const& distance, Distance const& chord_length = -1)
|
|
{
|
|
concepts::check<Input const>();
|
|
concepts::check<Output>();
|
|
|
|
resolve_variant::buffer<Input>::apply(geometry_in, distance, chord_length, geometry_out);
|
|
}
|
|
|
|
/*!
|
|
\brief \brief_calc{buffer}
|
|
\ingroup buffer
|
|
\details \details_calc{return_buffer, \det_buffer}. \details_return{buffer}.
|
|
\tparam Input \tparam_geometry
|
|
\tparam Output \tparam_geometry
|
|
\tparam Distance \tparam_numeric
|
|
\param geometry \param_geometry
|
|
\param distance The distance to be used for the buffer
|
|
\param chord_length (optional) The length of the chord's in the generated arcs
|
|
around points or bends (RESERVED, NOT YET USED)
|
|
\return \return_calc{buffer}
|
|
*/
|
|
template <typename Output, typename Input, typename Distance>
|
|
Output return_buffer(Input const& geometry, Distance const& distance, Distance const& chord_length = -1)
|
|
{
|
|
concepts::check<Input const>();
|
|
concepts::check<Output>();
|
|
|
|
Output geometry_out;
|
|
|
|
resolve_variant::buffer<Input>::apply(geometry, distance, chord_length, geometry_out);
|
|
|
|
return geometry_out;
|
|
}
|
|
|
|
/*!
|
|
\brief \brief_calc{buffer}
|
|
\ingroup buffer
|
|
\details \details_calc{buffer, \det_buffer}.
|
|
\tparam GeometryIn \tparam_geometry
|
|
\tparam MultiPolygon \tparam_geometry{MultiPolygon}
|
|
\tparam DistanceStrategy A strategy defining distance (or radius)
|
|
\tparam SideStrategy A strategy defining creation along sides
|
|
\tparam JoinStrategy A strategy defining creation around convex corners
|
|
\tparam EndStrategy A strategy defining creation at linestring ends
|
|
\tparam PointStrategy A strategy defining creation around points
|
|
\param geometry_in \param_geometry
|
|
\param geometry_out output multi polygon (or std:: collection of polygons),
|
|
will contain a buffered version of the input geometry
|
|
\param distance_strategy The distance strategy to be used
|
|
\param side_strategy The side strategy to be used
|
|
\param join_strategy The join strategy to be used
|
|
\param end_strategy The end strategy to be used
|
|
\param point_strategy The point strategy to be used
|
|
|
|
\qbk{distinguish,with strategies}
|
|
\qbk{[include reference/algorithms/buffer_with_strategies.qbk]}
|
|
*/
|
|
template
|
|
<
|
|
typename GeometryIn,
|
|
typename MultiPolygon,
|
|
typename DistanceStrategy,
|
|
typename SideStrategy,
|
|
typename JoinStrategy,
|
|
typename EndStrategy,
|
|
typename PointStrategy
|
|
>
|
|
inline void buffer(GeometryIn const& geometry_in,
|
|
MultiPolygon& geometry_out,
|
|
DistanceStrategy const& distance_strategy,
|
|
SideStrategy const& side_strategy,
|
|
JoinStrategy const& join_strategy,
|
|
EndStrategy const& end_strategy,
|
|
PointStrategy const& point_strategy)
|
|
{
|
|
typedef typename boost::range_value<MultiPolygon>::type polygon_type;
|
|
concepts::check<GeometryIn const>();
|
|
concepts::check<polygon_type>();
|
|
|
|
typedef typename point_type<GeometryIn>::type point_type;
|
|
typedef typename rescale_policy_type<point_type>::type rescale_policy_type;
|
|
|
|
geometry_out.clear();
|
|
|
|
if (geometry::is_empty(geometry_in))
|
|
{
|
|
// Then output geometry is kept empty as well
|
|
return;
|
|
}
|
|
|
|
model::box<point_type> box;
|
|
geometry::envelope(geometry_in, box);
|
|
geometry::buffer(box, box, distance_strategy.max_distance(join_strategy, end_strategy));
|
|
|
|
rescale_policy_type rescale_policy
|
|
= boost::geometry::get_rescale_policy<rescale_policy_type>(box);
|
|
|
|
detail::buffer::buffer_inserter<polygon_type>(geometry_in, range::back_inserter(geometry_out),
|
|
distance_strategy,
|
|
side_strategy,
|
|
join_strategy,
|
|
end_strategy,
|
|
point_strategy,
|
|
rescale_policy);
|
|
}
|
|
|
|
|
|
}} // namespace boost::geometry
|
|
|
|
#endif // BOOST_GEOMETRY_ALGORITHMS_BUFFER_HPP
|