Chris@16: // Boost.Geometry (aka GGL, Generic Geometry Library)
Chris@16: 
Chris@101: // Copyright (c) 2007-2014 Barend Gehrels, Amsterdam, the Netherlands.
Chris@101: // Copyright (c) 2008-2014 Bruno Lalande, Paris, France.
Chris@101: // Copyright (c) 2009-2014 Mateusz Loskot, London, UK.
Chris@101: 
Chris@101: // This file was modified by Oracle on 2014.
Chris@101: // Modifications copyright (c) 2014, Oracle and/or its affiliates.
Chris@101: 
Chris@101: // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
Chris@16: 
Chris@16: // Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
Chris@16: // (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
Chris@16: 
Chris@16: // Use, modification and distribution is subject to the Boost Software License,
Chris@16: // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_GEOMETRY_ALGORITHMS_PERIMETER_HPP
Chris@16: #define BOOST_GEOMETRY_ALGORITHMS_PERIMETER_HPP
Chris@16: 
Chris@101: #include <boost/range/metafunctions.hpp>
Chris@16: 
Chris@101: #include <boost/variant/apply_visitor.hpp>
Chris@101: #include <boost/variant/static_visitor.hpp>
Chris@101: #include <boost/variant/variant_fwd.hpp>
Chris@101: 
Chris@16: #include <boost/geometry/algorithms/length.hpp>
Chris@16: #include <boost/geometry/algorithms/detail/calculate_null.hpp>
Chris@16: #include <boost/geometry/algorithms/detail/calculate_sum.hpp>
Chris@101: #include <boost/geometry/algorithms/detail/multi_sum.hpp>
Chris@16: // #include <boost/geometry/algorithms/detail/throw_on_empty_input.hpp>
Chris@101: #include <boost/geometry/core/cs.hpp>
Chris@101: #include <boost/geometry/core/closure.hpp>
Chris@101: #include <boost/geometry/core/tags.hpp>
Chris@101: #include <boost/geometry/geometries/concepts/check.hpp>
Chris@101: #include <boost/geometry/strategies/default_length_result.hpp>
Chris@101: #include <boost/geometry/strategies/default_strategy.hpp>
Chris@16: 
Chris@16: namespace boost { namespace geometry
Chris@16: {
Chris@16: 
Chris@16: #ifndef DOXYGEN_NO_DISPATCH
Chris@16: namespace dispatch
Chris@16: {
Chris@16: 
Chris@16: // Default perimeter is 0.0, specializations implement calculated values
Chris@16: template <typename Geometry, typename Tag = typename tag<Geometry>::type>
Chris@16: struct perimeter : detail::calculate_null
Chris@16: {
Chris@16:     typedef typename default_length_result<Geometry>::type return_type;
Chris@16: 
Chris@16:     template <typename Strategy>
Chris@16:     static inline return_type apply(Geometry const& geometry, Strategy const& strategy)
Chris@16:     {
Chris@16:         return calculate_null::apply<return_type>(geometry, strategy);
Chris@16:     }
Chris@16: };
Chris@16: 
Chris@16: template <typename Geometry>
Chris@16: struct perimeter<Geometry, ring_tag>
Chris@16:     : detail::length::range_length
Chris@16:         <
Chris@16:             Geometry,
Chris@16:             closure<Geometry>::value
Chris@16:         >
Chris@16: {};
Chris@16: 
Chris@16: template <typename Polygon>
Chris@16: struct perimeter<Polygon, polygon_tag> : detail::calculate_polygon_sum
Chris@16: {
Chris@16:     typedef typename default_length_result<Polygon>::type return_type;
Chris@16:     typedef detail::length::range_length
Chris@16:                 <
Chris@16:                     typename ring_type<Polygon>::type,
Chris@16:                     closure<Polygon>::value
Chris@16:                 > policy;
Chris@16: 
Chris@16:     template <typename Strategy>
Chris@16:     static inline return_type apply(Polygon const& polygon, Strategy const& strategy)
Chris@16:     {
Chris@16:         return calculate_polygon_sum::apply<return_type, policy>(polygon, strategy);
Chris@16:     }
Chris@16: };
Chris@16: 
Chris@101: template <typename MultiPolygon>
Chris@101: struct perimeter<MultiPolygon, multi_polygon_tag> : detail::multi_sum
Chris@101: {
Chris@101:     typedef typename default_length_result<MultiPolygon>::type return_type;
Chris@101: 
Chris@101:     template <typename Strategy>
Chris@101:     static inline return_type apply(MultiPolygon const& multi, Strategy const& strategy)
Chris@101:     {
Chris@101:         return multi_sum::apply
Chris@101:                <
Chris@101:                    return_type,
Chris@101:                    perimeter<typename boost::range_value<MultiPolygon>::type>
Chris@101:                >(multi, strategy);
Chris@101:     }
Chris@101: };
Chris@101: 
Chris@16: 
Chris@16: // box,n-sphere: to be implemented
Chris@16: 
Chris@16: } // namespace dispatch
Chris@16: #endif // DOXYGEN_NO_DISPATCH
Chris@16: 
Chris@16: 
Chris@101: namespace resolve_strategy {
Chris@101: 
Chris@101: struct perimeter
Chris@101: {
Chris@101:     template <typename Geometry, typename Strategy>
Chris@101:     static inline typename default_length_result<Geometry>::type
Chris@101:     apply(Geometry const& geometry, Strategy const& strategy)
Chris@101:     {
Chris@101:         return dispatch::perimeter<Geometry>::apply(geometry, strategy);
Chris@101:     }
Chris@101: 
Chris@101:     template <typename Geometry>
Chris@101:     static inline typename default_length_result<Geometry>::type
Chris@101:     apply(Geometry const& geometry, default_strategy)
Chris@101:     {
Chris@101:         typedef typename strategy::distance::services::default_strategy
Chris@101:             <
Chris@101:                 point_tag, point_tag, typename point_type<Geometry>::type
Chris@101:             >::type strategy_type;
Chris@101: 
Chris@101:         return dispatch::perimeter<Geometry>::apply(geometry, strategy_type());
Chris@101:     }
Chris@101: };
Chris@101: 
Chris@101: } // namespace resolve_strategy
Chris@101: 
Chris@101: 
Chris@101: namespace resolve_variant {
Chris@101: 
Chris@101: template <typename Geometry>
Chris@101: struct perimeter
Chris@101: {
Chris@101:     template <typename Strategy>
Chris@101:     static inline typename default_length_result<Geometry>::type
Chris@101:     apply(Geometry const& geometry, Strategy const& strategy)
Chris@101:     {
Chris@101:         concept::check<Geometry const>();
Chris@101:         return resolve_strategy::perimeter::apply(geometry, strategy);
Chris@101:     }
Chris@101: };
Chris@101: 
Chris@101: template <BOOST_VARIANT_ENUM_PARAMS(typename T)>
Chris@101: struct perimeter<boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> >
Chris@101: {
Chris@101:     typedef typename default_length_result
Chris@101:         <
Chris@101:             boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)>
Chris@101:         >::type result_type;
Chris@101: 
Chris@101:     template <typename Strategy>
Chris@101:     struct visitor: boost::static_visitor<result_type>
Chris@101:     {
Chris@101:         Strategy const& m_strategy;
Chris@101: 
Chris@101:         visitor(Strategy const& strategy): m_strategy(strategy) {}
Chris@101: 
Chris@101:         template <typename Geometry>
Chris@101:         typename default_length_result<Geometry>::type
Chris@101:         operator()(Geometry const& geometry) const
Chris@101:         {
Chris@101:             return perimeter<Geometry>::apply(geometry, m_strategy);
Chris@101:         }
Chris@101:     };
Chris@101: 
Chris@101:     template <typename Strategy>
Chris@101:     static inline result_type
Chris@101:     apply(boost::variant<BOOST_VARIANT_ENUM_PARAMS(T)> const& geometry,
Chris@101:           Strategy const& strategy)
Chris@101:     {
Chris@101:         return boost::apply_visitor(visitor<Strategy>(strategy), geometry);
Chris@101:     }
Chris@101: };
Chris@101: 
Chris@101: } // namespace resolve_variant
Chris@101: 
Chris@101: 
Chris@16: /*!
Chris@16: \brief \brief_calc{perimeter}
Chris@16: \ingroup perimeter
Chris@16: \details The function perimeter returns the perimeter of a geometry,
Chris@16:     using the default distance-calculation-strategy
Chris@16: \tparam Geometry \tparam_geometry
Chris@16: \param geometry \param_geometry
Chris@16: \return \return_calc{perimeter}
Chris@16: 
Chris@16: \qbk{[include reference/algorithms/perimeter.qbk]}
Chris@16:  */
Chris@16: template<typename Geometry>
Chris@16: inline typename default_length_result<Geometry>::type perimeter(
Chris@16:         Geometry const& geometry)
Chris@16: {
Chris@16:     // detail::throw_on_empty_input(geometry);
Chris@101:     return resolve_variant::perimeter<Geometry>::apply(geometry, default_strategy());
Chris@16: }
Chris@16: 
Chris@16: /*!
Chris@16: \brief \brief_calc{perimeter} \brief_strategy
Chris@16: \ingroup perimeter
Chris@16: \details The function perimeter returns the perimeter of a geometry,
Chris@16:     using specified strategy
Chris@16: \tparam Geometry \tparam_geometry
Chris@16: \tparam Strategy \tparam_strategy{distance}
Chris@16: \param geometry \param_geometry
Chris@16: \param strategy strategy to be used for distance calculations.
Chris@16: \return \return_calc{perimeter}
Chris@16: 
Chris@16: \qbk{distinguish,with strategy}
Chris@16: \qbk{[include reference/algorithms/perimeter.qbk]}
Chris@16:  */
Chris@16: template<typename Geometry, typename Strategy>
Chris@16: inline typename default_length_result<Geometry>::type perimeter(
Chris@16:         Geometry const& geometry, Strategy const& strategy)
Chris@16: {
Chris@16:     // detail::throw_on_empty_input(geometry);
Chris@101:     return resolve_variant::perimeter<Geometry>::apply(geometry, strategy);
Chris@16: }
Chris@16: 
Chris@16: }} // namespace boost::geometry
Chris@16: 
Chris@16: #endif // BOOST_GEOMETRY_ALGORITHMS_PERIMETER_HPP
Chris@16: