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// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
// Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
// Copyright (c) 2009-2012 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>
// #include <boost/geometry/algorithms/detail/throw_on_empty_input.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;
// detail::throw_on_empty_input(geometry);
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>();
// detail::throw_on_empty_input(geometry);
return dispatch::perimeter
<
typename tag<Geometry>::type,
Geometry,
Strategy
>::apply(geometry, strategy);
}
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_ALGORITHMS_PERIMETER_HPP
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