FM / algorithms

/usr/include/boost/geometry/algorithms

Name	Size	Mode	Actions
detail/	-	0755	rm
dispatch/	-	0755	rm
append.hpp	11493	0644	edit dl rm
area.hpp	10657	0644	edit dl rm
assign.hpp	10709	0644	edit dl rm
buffer.hpp	8656	0644	edit dl rm
centroid.hpp	19620	0644	edit dl rm
clear.hpp	5156	0644	edit dl rm
comparable_distance.hpp	1107	0644	edit dl rm
convert.hpp	17327	0644	edit dl rm
convex_hull.hpp	11589	0644	edit dl rm
correct.hpp	9956	0644	edit dl rm
correct_closure.hpp	5862	0644	edit dl rm
covered_by.hpp	1077	0644	edit dl rm
crosses.hpp	8478	0644	edit dl rm
densify.hpp	12472	0644	edit dl rm
difference.hpp	16591	0644	edit dl rm
discrete_frechet_distance.hpp	7844	0644	edit dl rm
discrete_hausdorff_distance.hpp	11281	0644	edit dl rm
disjoint.hpp	1191	0644	edit dl rm
distance.hpp	1110	0644	edit dl rm
envelope.hpp	1021	0644	edit dl rm
equals.hpp	1196	0644	edit dl rm
expand.hpp	1073	0644	edit dl rm
for_each.hpp	9831	0644	edit dl rm
intersection.hpp	806	0644	edit dl rm
intersects.hpp	1145	0644	edit dl rm
is_convex.hpp	6508	0644	edit dl rm
is_empty.hpp	4853	0644	edit dl rm
is_simple.hpp	575	0644	edit dl rm
is_valid.hpp	570	0644	edit dl rm
length.hpp	9341	0644	edit dl rm
line_interpolate.hpp	13054	0644	edit dl rm
make.hpp	5170	0644	edit dl rm
not_implemented.hpp	3839	0644	edit dl rm
num_geometries.hpp	3586	0644	edit dl rm
num_interior_rings.hpp	3756	0644	edit dl rm
num_points.hpp	5565	0644	edit dl rm
num_segments.hpp	4775	0644	edit dl rm
overlaps.hpp	1067	0644	edit dl rm
perimeter.hpp	7212	0644	edit dl rm
point_on_surface.hpp	13281	0644	edit dl rm
relate.hpp	642	0644	edit dl rm
relation.hpp	652	0644	edit dl rm
remove_spikes.hpp	9753	0644	edit dl rm
reverse.hpp	4386	0644	edit dl rm
simplify.hpp	22696	0644	edit dl rm
sym_difference.hpp	23169	0644	edit dl rm
touches.hpp	1127	0644	edit dl rm
transform.hpp	14105	0644	edit dl rm
union.hpp	21383	0644	edit dl rm
unique.hpp	4682	0644	edit dl rm
validity_failure_type.hpp	3684	0644	edit dl rm
within.hpp	1057	0644	edit dl rm

Edit: /usr/include/boost/geometry/algorithms/area.hpp (10657B)

// 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.
// Copyright (c) 2017 Adam Wulkiewicz, Lodz, Poland.

// This file was modified by Oracle on 2017, 2018.
// Modifications copyright (c) 2017-2018 Oracle and/or its affiliates.
// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle

// 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_AREA_HPP
#define BOOST_GEOMETRY_ALGORITHMS_AREA_HPP

#include <boost/concept_check.hpp>
#include <boost/core/ignore_unused.hpp>
#include <boost/range/functions.hpp>
#include <boost/range/metafunctions.hpp>

#include <boost/variant/apply_visitor.hpp>
#include <boost/variant/static_visitor.hpp>
#include <boost/variant/variant_fwd.hpp>

#include <boost/geometry/core/closure.hpp>
#include <boost/geometry/core/exterior_ring.hpp>
#include <boost/geometry/core/interior_rings.hpp>
#include <boost/geometry/core/point_order.hpp>
#include <boost/geometry/core/point_type.hpp>
#include <boost/geometry/core/ring_type.hpp>
#include <boost/geometry/core/tags.hpp>

#include <boost/geometry/geometries/concepts/check.hpp>

#include <boost/geometry/algorithms/detail/calculate_null.hpp>
#include <boost/geometry/algorithms/detail/calculate_sum.hpp>
// #include <boost/geometry/algorithms/detail/throw_on_empty_input.hpp>
#include <boost/geometry/algorithms/detail/multi_sum.hpp>

#include <boost/geometry/strategies/area.hpp>
#include <boost/geometry/strategies/area_result.hpp>
#include <boost/geometry/strategies/default_area_result.hpp>
#include <boost/geometry/strategies/default_strategy.hpp>

#include <boost/geometry/strategies/concepts/area_concept.hpp>

#include <boost/geometry/util/math.hpp>
#include <boost/geometry/util/order_as_direction.hpp>
#include <boost/geometry/views/closeable_view.hpp>
#include <boost/geometry/views/reversible_view.hpp>

namespace boost { namespace geometry
{

#ifndef DOXYGEN_NO_DETAIL
namespace detail { namespace area
{

struct box_area
{
    template <typename Box, typename Strategy>
    static inline typename coordinate_type<Box>::type
    apply(Box const& box, Strategy const&)
    {
        // Currently only works for 2D Cartesian boxes
        assert_dimension<Box, 2>();

return (get<max_corner, 0>(box) - get<min_corner, 0>(box))
             * (get<max_corner, 1>(box) - get<min_corner, 1>(box));
    }
};

template
<
    iterate_direction Direction,
    closure_selector Closure
>
struct ring_area
{
    template <typename Ring, typename Strategy>
    static inline typename area_result<Ring, Strategy>::type
    apply(Ring const& ring, Strategy const& strategy)
    {
        BOOST_CONCEPT_ASSERT( (geometry::concepts::AreaStrategy<Ring, Strategy>) );
        assert_dimension<Ring, 2>();

// Ignore warning (because using static method sometimes) on strategy
        boost::ignore_unused(strategy);

// An open ring has at least three points,
        // A closed ring has at least four points,
        // if not, there is no (zero) area
        if (boost::size(ring)
                < core_detail::closure::minimum_ring_size<Closure>::value)
        {
            return typename area_result<Ring, Strategy>::type();
        }

typedef typename reversible_view<Ring const, Direction>::type rview_type;
        typedef typename closeable_view
            <
                rview_type const, Closure
            >::type view_type;
        typedef typename boost::range_iterator<view_type const>::type iterator_type;

rview_type rview(ring);
        view_type view(rview);
        typename Strategy::template state<Ring> state;
        iterator_type it = boost::begin(view);
        iterator_type end = boost::end(view);

for (iterator_type previous = it++;
            it != end;
            ++previous, ++it)
        {
            strategy.apply(*previous, *it, state);
        }

return strategy.result(state);
    }
};

}} // namespace detail::area

#endif // DOXYGEN_NO_DETAIL

#ifndef DOXYGEN_NO_DISPATCH
namespace dispatch
{

template
<
    typename Geometry,
    typename Tag = typename tag<Geometry>::type
>
struct area : detail::calculate_null
{
    template <typename Strategy>
    static inline typename area_result<Geometry, Strategy>::type
        apply(Geometry const& geometry, Strategy const& strategy)
    {
        return calculate_null::apply
            <
                typename area_result<Geometry, Strategy>::type
            >(geometry, strategy);
    }
};

template <typename Geometry>
struct area<Geometry, box_tag> : detail::area::box_area
{};

template <typename Ring>
struct area<Ring, ring_tag>
    : detail::area::ring_area
        <
            order_as_direction<geometry::point_order<Ring>::value>::value,
            geometry::closure<Ring>::value
        >
{};

template <typename Polygon>
struct area<Polygon, polygon_tag> : detail::calculate_polygon_sum
{
    template <typename Strategy>
    static inline typename area_result<Polygon, Strategy>::type
        apply(Polygon const& polygon, Strategy const& strategy)
    {
        return calculate_polygon_sum::apply<
            typename area_result<Polygon, Strategy>::type,
            detail::area::ring_area
                <
                    order_as_direction<geometry::point_order<Polygon>::value>::value,
                    geometry::closure<Polygon>::value
                >
            >(polygon, strategy);
    }
};

template <typename MultiGeometry>
struct area<MultiGeometry, multi_polygon_tag> : detail::multi_sum
{
    template <typename Strategy>
    static inline typename area_result<MultiGeometry, Strategy>::type
    apply(MultiGeometry const& multi, Strategy const& strategy)
    {
        return multi_sum::apply
               <
                   typename area_result<MultiGeometry, Strategy>::type,
                   area<typename boost::range_value<MultiGeometry>::type>
               >(multi, strategy);
    }
};

} // namespace dispatch
#endif // DOXYGEN_NO_DISPATCH

namespace resolve_strategy
{

template <typename Strategy>
struct area
{
    template <typename Geometry>
    static inline typename area_result<Geometry, Strategy>::type
    apply(Geometry const& geometry, Strategy const& strategy)
    {
        return dispatch::area<Geometry>::apply(geometry, strategy);
    }
};

template <>
struct area<default_strategy>
{
    template <typename Geometry>
    static inline typename area_result<Geometry>::type
    apply(Geometry const& geometry, default_strategy)
    {
        typedef typename strategy::area::services::default_strategy
            <
                typename cs_tag<Geometry>::type
            >::type strategy_type;

return dispatch::area<Geometry>::apply(geometry, strategy_type());
    }
};

} // namespace resolve_strategy

namespace resolve_variant
{

template <typename Geometry>
struct area
{
    template <typename Strategy>
    static inline typename area_result<Geometry, Strategy>::type
        apply(Geometry const& geometry, Strategy const& strategy)
    {
        return resolve_strategy::area<Strategy>::apply(geometry, strategy);
    }
};

template <BOOST_VARIANT_ENUM_PARAMS(typename T)>
struct area<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
{
    typedef boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> variant_type;

template <typename Strategy>
    struct visitor
        : boost::static_visitor<typename area_result<variant_type, Strategy>::type>
    {
        Strategy const& m_strategy;

visitor(Strategy const& strategy): m_strategy(strategy) {}

template <typename Geometry>
        typename area_result<variant_type, Strategy>::type
        operator()(Geometry const& geometry) const
        {
            return area<Geometry>::apply(geometry, m_strategy);
        }
    };

template <typename Strategy>
    static inline typename area_result<variant_type, Strategy>::type
    apply(variant_type const& geometry,
          Strategy const& strategy)
    {
        return boost::apply_visitor(visitor<Strategy>(strategy), geometry);
    }
};

} // namespace resolve_variant

/*!
\brief \brief_calc{area}
\ingroup area
\details \details_calc{area}. \details_default_strategy

The area algorithm calculates the surface area of all geometries having a surface, namely
box, polygon, ring, multipolygon. The units are the square of the units used for the points
defining the surface. If subject geometry is defined in meters, then area is calculated
in square meters.

The area calculation can be done in all three common coordinate systems, Cartesian, Spherical
and Geographic as well.

\tparam Geometry \tparam_geometry
\param geometry \param_geometry
\return \return_calc{area}

\qbk{[include reference/algorithms/area.qbk]}
\qbk{[heading Examples]}
\qbk{[area] [area_output]}
*/
template <typename Geometry>
inline typename area_result<Geometry>::type
area(Geometry const& geometry)
{
    concepts::check<Geometry const>();

// detail::throw_on_empty_input(geometry);

return resolve_variant::area<Geometry>::apply(geometry, default_strategy());
}

/*!
\brief \brief_calc{area} \brief_strategy
\ingroup area
\details \details_calc{area} \brief_strategy. \details_strategy_reasons
\tparam Geometry \tparam_geometry
\tparam Strategy \tparam_strategy{Area}
\param geometry \param_geometry
\param strategy \param_strategy{area}
\return \return_calc{area}

\qbk{distinguish,with strategy}

\qbk{
[include reference/algorithms/area.qbk]

[heading Available Strategies]
\* [link geometry.reference.strategies.strategy_area_cartesian Cartesian]
\* [link geometry.reference.strategies.strategy_area_spherical Spherical]
\* [link geometry.reference.strategies.strategy_area_geographic Geographic]

[heading Example]
[area_with_strategy]
[area_with_strategy_output]
}
 */
template <typename Geometry, typename Strategy>
inline typename area_result<Geometry, Strategy>::type
area(Geometry const& geometry, Strategy const& strategy)
{
    concepts::check<Geometry const>();

// detail::throw_on_empty_input(geometry);

return resolve_variant::area<Geometry>::apply(geometry, strategy);
}

}} // namespace boost::geometry

#endif // BOOST_GEOMETRY_ALGORITHMS_AREA_HPP

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