/usr/include/boost/geometry/algorithms
Edit: /usr/include/boost/geometry/algorithms/length.hpp (9341B)
// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2007-2014 Barend Gehrels, Amsterdam, the Netherlands.
// Copyright (c) 2008-2014 Bruno Lalande, Paris, France.
// Copyright (c) 2009-2014 Mateusz Loskot, London, UK.
// This file was modified by Oracle on 2014, 2015.
// Modifications copyright (c) 2014-2015, Oracle and/or its affiliates.
// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
// 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_LENGTH_HPP
#define BOOST_GEOMETRY_ALGORITHMS_LENGTH_HPP
#include
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// #include
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namespace boost { namespace geometry
{
#ifndef DOXYGEN_NO_DETAIL
namespace detail { namespace length
{
template
struct segment_length
{
template
static inline typename default_length_result::type apply(
Segment const& segment, Strategy const& strategy)
{
boost::ignore_unused(strategy);
typedef typename point_type::type point_type;
point_type p1, p2;
geometry::detail::assign_point_from_index<0>(segment, p1);
geometry::detail::assign_point_from_index<1>(segment, p2);
return strategy.apply(p1, p2);
}
};
/*!
\brief Internal, calculates length of a linestring using iterator pairs and
specified strategy
\note for_each could be used here, now that point_type is changed by boost
range iterator
*/
template
struct range_length
{
typedef typename default_length_result::type return_type;
template
static inline return_type apply(
Range const& range, Strategy const& strategy)
{
boost::ignore_unused(strategy);
typedef typename closeable_view::type view_type;
typedef typename boost::range_iterator
<
view_type const
>::type iterator_type;
return_type sum = return_type();
view_type view(range);
iterator_type it = boost::begin(view), end = boost::end(view);
if(it != end)
{
for(iterator_type previous = it++;
it != end;
++previous, ++it)
{
// Add point-point distance using the return type belonging
// to strategy
sum += strategy.apply(*previous, *it);
}
}
return sum;
}
};
}} // namespace detail::length
#endif // DOXYGEN_NO_DETAIL
#ifndef DOXYGEN_NO_DISPATCH
namespace dispatch
{
template ::type>
struct length : detail::calculate_null
{
typedef typename default_length_result::type return_type;
template
static inline return_type apply(Geometry const& geometry, Strategy const& strategy)
{
return calculate_null::apply(geometry, strategy);
}
};
template
struct length
: detail::length::range_length
{};
// RING: length is currently 0; it might be argued that it is the "perimeter"
template
struct length
: detail::length::segment_length
{};
template
struct length : detail::multi_sum
{
template
static inline typename default_length_result::type
apply(MultiLinestring const& multi, Strategy const& strategy)
{
return multi_sum::apply
<
typename default_length_result::type,
detail::length::range_length
<
typename boost::range_value::type,
closed // no need to close it explicitly
>
>(multi, strategy);
}
};
} // namespace dispatch
#endif // DOXYGEN_NO_DISPATCH
namespace resolve_strategy {
struct length
{
template
static inline typename default_length_result::type
apply(Geometry const& geometry, Strategy const& strategy)
{
return dispatch::length::apply(geometry, strategy);
}
template
static inline typename default_length_result::type
apply(Geometry const& geometry, default_strategy)
{
typedef typename strategy::distance::services::default_strategy
<
point_tag, point_tag, typename point_type::type
>::type strategy_type;
return dispatch::length::apply(geometry, strategy_type());
}
};
} // namespace resolve_strategy
namespace resolve_variant {
template
struct length
{
template
static inline typename default_length_result::type
apply(Geometry const& geometry, Strategy const& strategy)
{
return resolve_strategy::length::apply(geometry, strategy);
}
};
template
struct length >
{
typedef typename default_length_result
<
boost::variant
>::type result_type;
template
struct visitor
: static_visitor
{
Strategy const& m_strategy;
visitor(Strategy const& strategy)
: m_strategy(strategy)
{}
template
inline typename default_length_result::type
operator()(Geometry const& geometry) const
{
return length::apply(geometry, m_strategy);
}
};
template
static inline result_type apply(
variant const& geometry,
Strategy const& strategy
)
{
return boost::apply_visitor(visitor(strategy), geometry);
}
};
} // namespace resolve_variant
/*!
\brief \brief_calc{length}
\ingroup length
\details \details_calc{length, length (the sum of distances between consecutive points)}. \details_default_strategy
\tparam Geometry \tparam_geometry
\param geometry \param_geometry
\return \return_calc{length}
\qbk{[include reference/algorithms/length.qbk]}
\qbk{[length] [length_output]}
*/
template
inline typename default_length_result::type
length(Geometry const& geometry)
{
concepts::check();
// detail::throw_on_empty_input(geometry);
return resolve_variant::length::apply(geometry, default_strategy());
}
/*!
\brief \brief_calc{length} \brief_strategy
\ingroup length
\details \details_calc{length, length (the sum of distances between consecutive points)} \brief_strategy. \details_strategy_reasons
\tparam Geometry \tparam_geometry
\tparam Strategy \tparam_strategy{distance}
\param geometry \param_geometry
\param strategy \param_strategy{distance}
\return \return_calc{length}
\qbk{distinguish,with strategy}
\qbk{[include reference/algorithms/length.qbk]}
\qbk{[length_with_strategy] [length_with_strategy_output]}
*/
template
inline typename default_length_result::type
length(Geometry const& geometry, Strategy const& strategy)
{
concepts::check();
// detail::throw_on_empty_input(geometry);
return resolve_variant::length::apply(geometry, strategy);
}
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_ALGORITHMS_LENGTH_HPP