| // Boost.Geometry (aka GGL, Generic Geometry Library) |
| |
| // Copyright (c) 2007-2011 Barend Gehrels, Amsterdam, the Netherlands. |
| // Copyright (c) 2008-2011 Bruno Lalande, Paris, France. |
| // Copyright (c) 2009-2011 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_PERIMETER_HPP |
| #define BOOST_GEOMETRY_ALGORITHMS_PERIMETER_HPP |
| |
| |
| #include <boost/geometry/core/cs.hpp> |
| #include <boost/geometry/core/closure.hpp> |
| #include <boost/geometry/geometries/concepts/check.hpp> |
| #include <boost/geometry/strategies/default_length_result.hpp> |
| #include <boost/geometry/algorithms/length.hpp> |
| #include <boost/geometry/algorithms/detail/calculate_null.hpp> |
| #include <boost/geometry/algorithms/detail/calculate_sum.hpp> |
| |
| |
| namespace boost { namespace geometry |
| { |
| |
| #ifndef DOXYGEN_NO_DISPATCH |
| namespace dispatch |
| { |
| |
| // Default perimeter is 0.0, specializations implement calculated values |
| template <typename Tag, typename Geometry, typename Strategy> |
| struct perimeter : detail::calculate_null |
| < |
| typename default_length_result<Geometry>::type, |
| Geometry, |
| Strategy |
| > |
| {}; |
| |
| template <typename Geometry, typename Strategy> |
| struct perimeter<ring_tag, Geometry, Strategy> |
| : detail::length::range_length |
| < |
| Geometry, |
| Strategy, |
| closure<Geometry>::value |
| > |
| {}; |
| |
| template <typename Polygon, typename Strategy> |
| struct perimeter<polygon_tag, Polygon, Strategy> |
| : detail::calculate_polygon_sum |
| < |
| typename default_length_result<Polygon>::type, |
| Polygon, |
| Strategy, |
| detail::length::range_length |
| < |
| typename ring_type<Polygon>::type, |
| Strategy, |
| closure<Polygon>::value |
| > |
| > |
| {}; |
| |
| |
| // box,n-sphere: to be implemented |
| |
| } // namespace dispatch |
| #endif // DOXYGEN_NO_DISPATCH |
| |
| |
| /*! |
| \brief \brief_calc{perimeter} |
| \ingroup perimeter |
| \details The function perimeter returns the perimeter of a geometry, |
| using the default distance-calculation-strategy |
| \tparam Geometry \tparam_geometry |
| \param geometry \param_geometry |
| \return \return_calc{perimeter} |
| |
| \qbk{[include reference/algorithms/perimeter.qbk]} |
| */ |
| template<typename Geometry> |
| inline typename default_length_result<Geometry>::type perimeter( |
| Geometry const& geometry) |
| { |
| concept::check<Geometry const>(); |
| |
| typedef typename point_type<Geometry>::type point_type; |
| typedef typename strategy::distance::services::default_strategy |
| < |
| point_tag, point_type |
| >::type strategy_type; |
| |
| return dispatch::perimeter |
| < |
| typename tag<Geometry>::type, |
| Geometry, |
| strategy_type |
| >::apply(geometry, strategy_type()); |
| } |
| |
| /*! |
| \brief \brief_calc{perimeter} \brief_strategy |
| \ingroup perimeter |
| \details The function perimeter returns the perimeter of a geometry, |
| using specified strategy |
| \tparam Geometry \tparam_geometry |
| \tparam Strategy \tparam_strategy{distance} |
| \param geometry \param_geometry |
| \param strategy strategy to be used for distance calculations. |
| \return \return_calc{perimeter} |
| |
| \qbk{distinguish,with strategy} |
| \qbk{[include reference/algorithms/perimeter.qbk]} |
| */ |
| template<typename Geometry, typename Strategy> |
| inline typename default_length_result<Geometry>::type perimeter( |
| Geometry const& geometry, Strategy const& strategy) |
| { |
| concept::check<Geometry const>(); |
| |
| return dispatch::perimeter |
| < |
| typename tag<Geometry>::type, |
| Geometry, |
| Strategy |
| >::apply(geometry, strategy); |
| } |
| |
| }} // namespace boost::geometry |
| |
| #endif // BOOST_GEOMETRY_ALGORITHMS_PERIMETER_HPP |
| |