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139 lines
3.9 KiB
139 lines
3.9 KiB
// Boost.Geometry (aka GGL, Generic Geometry Library) |
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// Copyright (c) 2007-2011 Barend Gehrels, Amsterdam, the Netherlands. |
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// Copyright (c) 2008-2011 Bruno Lalande, Paris, France. |
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// Copyright (c) 2009-2011 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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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 Tag, typename Geometry, typename Strategy> |
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struct perimeter : detail::calculate_null |
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< |
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typename default_length_result<Geometry>::type, |
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Geometry, |
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Strategy |
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> |
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{}; |
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template <typename Geometry, typename Strategy> |
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struct perimeter<ring_tag, Geometry, Strategy> |
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: detail::length::range_length |
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< |
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Geometry, |
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Strategy, |
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closure<Geometry>::value |
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> |
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{}; |
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template <typename Polygon, typename Strategy> |
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struct perimeter<polygon_tag, Polygon, Strategy> |
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: detail::calculate_polygon_sum |
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< |
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typename default_length_result<Polygon>::type, |
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Polygon, |
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Strategy, |
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detail::length::range_length |
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< |
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typename ring_type<Polygon>::type, |
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Strategy, |
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closure<Polygon>::value |
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> |
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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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return dispatch::perimeter |
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< |
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typename tag<Geometry>::type, |
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Geometry, |
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strategy_type |
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>::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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return dispatch::perimeter |
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< |
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typename tag<Geometry>::type, |
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Geometry, |
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Strategy |
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>::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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