264 lines
8.1 KiB
C++
264 lines
8.1 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2014 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2014 Bruno Lalande, Paris, France.
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// Copyright (c) 2009-2014 Mateusz Loskot, London, UK.
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// This file was modified by Oracle on 2014-2021.
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// Modifications copyright (c) 2014-2021, Oracle and/or its affiliates.
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// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
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// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_GEOMETRY_ALGORITHMS_PERIMETER_HPP
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#define BOOST_GEOMETRY_ALGORITHMS_PERIMETER_HPP
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#include <boost/range/value_type.hpp>
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#include <boost/geometry/algorithms/length.hpp>
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#include <boost/geometry/algorithms/detail/calculate_null.hpp>
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#include <boost/geometry/algorithms/detail/calculate_sum.hpp>
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#include <boost/geometry/algorithms/detail/multi_sum.hpp>
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// #include <boost/geometry/algorithms/detail/throw_on_empty_input.hpp>
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#include <boost/geometry/algorithms/detail/visit.hpp>
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#include <boost/geometry/core/cs.hpp>
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#include <boost/geometry/core/closure.hpp>
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#include <boost/geometry/core/tags.hpp>
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#include <boost/geometry/core/visit.hpp>
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#include <boost/geometry/geometries/adapted/boost_variant.hpp> // For backward compatibility
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#include <boost/geometry/geometries/concepts/check.hpp>
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#include <boost/geometry/strategies/default_length_result.hpp>
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#include <boost/geometry/strategies/default_strategy.hpp>
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#include <boost/geometry/strategies/detail.hpp>
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#include <boost/geometry/strategies/length/cartesian.hpp>
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#include <boost/geometry/strategies/length/geographic.hpp>
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#include <boost/geometry/strategies/length/spherical.hpp>
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namespace boost { namespace geometry
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{
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#ifndef DOXYGEN_NO_DISPATCH
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namespace dispatch
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{
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// Default perimeter is 0.0, specializations implement calculated values
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template <typename Geometry, typename Tag = typename tag<Geometry>::type>
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struct perimeter : detail::calculate_null
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{
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typedef typename default_length_result<Geometry>::type return_type;
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template <typename Strategy>
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static inline return_type apply(Geometry const& geometry, Strategy const& strategy)
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{
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return calculate_null::apply<return_type>(geometry, strategy);
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}
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};
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template <typename Geometry>
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struct perimeter<Geometry, ring_tag>
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: detail::length::range_length
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<
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Geometry,
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closure<Geometry>::value
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>
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{};
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template <typename Polygon>
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struct perimeter<Polygon, polygon_tag> : detail::calculate_polygon_sum
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{
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typedef typename default_length_result<Polygon>::type return_type;
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typedef detail::length::range_length
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<
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typename ring_type<Polygon>::type,
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closure<Polygon>::value
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> policy;
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template <typename Strategy>
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static inline return_type apply(Polygon const& polygon, Strategy const& strategy)
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{
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return calculate_polygon_sum::apply<return_type, policy>(polygon, strategy);
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}
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};
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template <typename MultiPolygon>
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struct perimeter<MultiPolygon, multi_polygon_tag> : detail::multi_sum
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{
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typedef typename default_length_result<MultiPolygon>::type return_type;
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template <typename Strategy>
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static inline return_type apply(MultiPolygon const& multi, Strategy const& strategy)
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{
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return multi_sum::apply
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<
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return_type,
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perimeter<typename boost::range_value<MultiPolygon>::type>
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>(multi, strategy);
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}
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};
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// box,n-sphere: to be implemented
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} // namespace dispatch
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#endif // DOXYGEN_NO_DISPATCH
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namespace resolve_strategy {
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template
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<
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typename Strategies,
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bool IsUmbrella = strategies::detail::is_umbrella_strategy<Strategies>::value
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>
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struct perimeter
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{
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template <typename Geometry>
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static inline typename default_length_result<Geometry>::type
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apply(Geometry const& geometry, Strategies const& strategies)
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{
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return dispatch::perimeter<Geometry>::apply(geometry, strategies);
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}
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};
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template <typename Strategy>
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struct perimeter<Strategy, false>
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{
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template <typename Geometry>
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static inline typename default_length_result<Geometry>::type
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apply(Geometry const& geometry, Strategy const& strategy)
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{
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using strategies::length::services::strategy_converter;
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return dispatch::perimeter<Geometry>::apply(
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geometry, strategy_converter<Strategy>::get(strategy));
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}
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};
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template <>
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struct perimeter<default_strategy, false>
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{
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template <typename Geometry>
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static inline typename default_length_result<Geometry>::type
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apply(Geometry const& geometry, default_strategy const&)
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{
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typedef typename strategies::length::services::default_strategy
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<
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Geometry
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>::type strategies_type;
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return dispatch::perimeter<Geometry>::apply(geometry, strategies_type());
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}
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};
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} // namespace resolve_strategy
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namespace resolve_dynamic {
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template <typename Geometry, typename Tag = typename geometry::tag<Geometry>::type>
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struct perimeter
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{
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template <typename Strategy>
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static inline typename default_length_result<Geometry>::type
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apply(Geometry const& geometry, Strategy const& strategy)
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{
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concepts::check<Geometry const>();
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return resolve_strategy::perimeter<Strategy>::apply(geometry, strategy);
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}
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};
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template <typename Geometry>
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struct perimeter<Geometry, dynamic_geometry_tag>
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{
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template <typename Strategy>
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static inline typename default_length_result<Geometry>::type
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apply(Geometry const& geometry, Strategy const& strategy)
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{
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typename default_length_result<Geometry>::type result = 0;
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traits::visit<Geometry>::apply([&](auto const& g)
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{
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result = perimeter<util::remove_cref_t<decltype(g)>>::apply(g, strategy);
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}, geometry);
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return result;
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}
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};
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template <typename Geometry>
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struct perimeter<Geometry, geometry_collection_tag>
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{
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template <typename Strategy>
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static inline typename default_length_result<Geometry>::type
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apply(Geometry const& geometry, Strategy const& strategy)
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{
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typename default_length_result<Geometry>::type result = 0;
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detail::visit_breadth_first([&](auto const& g)
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{
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result += perimeter<util::remove_cref_t<decltype(g)>>::apply(g, strategy);
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return true;
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}, geometry);
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return result;
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}
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};
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} // namespace resolve_dynamic
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/*!
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\brief \brief_calc{perimeter}
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\ingroup perimeter
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\details The function perimeter returns the perimeter of a geometry,
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using the default distance-calculation-strategy
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\tparam Geometry \tparam_geometry
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\param geometry \param_geometry
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\return \return_calc{perimeter}
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\qbk{[include reference/algorithms/perimeter.qbk]}
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\qbk{
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[heading Example]
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[perimeter]
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[perimeter_output]
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}
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*/
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template<typename Geometry>
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inline typename default_length_result<Geometry>::type perimeter(
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Geometry const& geometry)
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{
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// detail::throw_on_empty_input(geometry);
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return resolve_dynamic::perimeter<Geometry>::apply(geometry, default_strategy());
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}
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/*!
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\brief \brief_calc{perimeter} \brief_strategy
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\ingroup perimeter
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\details The function perimeter returns the perimeter of a geometry,
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using specified strategy
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\tparam Geometry \tparam_geometry
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\tparam Strategy \tparam_strategy{distance}
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\param geometry \param_geometry
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\param strategy strategy to be used for distance calculations.
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\return \return_calc{perimeter}
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\qbk{distinguish,with strategy}
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\qbk{[include reference/algorithms/perimeter.qbk]}
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*/
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template<typename Geometry, typename Strategy>
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inline typename default_length_result<Geometry>::type perimeter(
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Geometry const& geometry, Strategy const& strategy)
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{
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// detail::throw_on_empty_input(geometry);
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return resolve_dynamic::perimeter<Geometry>::apply(geometry, strategy);
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}
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_ALGORITHMS_PERIMETER_HPP
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