138 lines
4.2 KiB
C++
138 lines
4.2 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
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// Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
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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/geometry/core/cs.hpp>
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#include <boost/geometry/core/closure.hpp>
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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/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/throw_on_empty_input.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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// box,n-sphere: to be implemented
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} // namespace dispatch
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#endif // DOXYGEN_NO_DISPATCH
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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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*/
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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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concept::check<Geometry const>();
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typedef typename point_type<Geometry>::type point_type;
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typedef typename strategy::distance::services::default_strategy
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<
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point_tag, point_type
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>::type strategy_type;
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// detail::throw_on_empty_input(geometry);
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return dispatch::perimeter<Geometry>::apply(geometry, strategy_type());
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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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concept::check<Geometry const>();
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// detail::throw_on_empty_input(geometry);
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return dispatch::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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