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// Boost.Geometry (aka GGL, Generic Geometry Library)
// Copyright (c) 2007-2012 Barend Gehrels, 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_DETAIL_OVERLAY_CONVERT_RING_HPP
#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_CONVERT_RING_HPP
#include <boost/mpl/assert.hpp>
#include <boost/range.hpp>
#include <boost/range/algorithm/reverse.hpp>
#include <boost/geometry/core/tags.hpp>
#include <boost/geometry/core/exterior_ring.hpp>
#include <boost/geometry/core/interior_rings.hpp>
#include <boost/geometry/algorithms/detail/ring_identifier.hpp>
#include <boost/geometry/algorithms/convert.hpp>
namespace boost { namespace geometry
{
#ifndef DOXYGEN_NO_DETAIL
namespace detail { namespace overlay
{
template<typename Tag>
struct convert_ring
{
BOOST_MPL_ASSERT_MSG
(
false, NOT_OR_NOT_YET_IMPLEMENTED_FOR_THIS_GEOMETRY_TAG
, (types<Tag>)
);
};
template<>
struct convert_ring<ring_tag>
{
template<typename Destination, typename Source>
static inline void apply(Destination& destination, Source const& source,
bool append, bool reverse)
{
if (! append)
{
geometry::convert(source, destination);
if (reverse)
{
boost::reverse(destination);
}
}
}
};
template<>
struct convert_ring<polygon_tag>
{
template<typename Destination, typename Source>
static inline void apply(Destination& destination, Source const& source,
bool append, bool reverse)
{
if (! append)
{
geometry::convert(source, exterior_ring(destination));
if (reverse)
{
boost::reverse(exterior_ring(destination));
}
}
else
{
// Avoid adding interior rings which are invalid
// because of its number of points:
std::size_t const min_num_points
= core_detail::closure::minimum_ring_size
<
geometry::closure<Destination>::value
>::value;
if (geometry::num_points(source) >= min_num_points)
{
interior_rings(destination).resize(
interior_rings(destination).size() + 1);
geometry::convert(source, interior_rings(destination).back());
if (reverse)
{
boost::reverse(interior_rings(destination).back());
}
}
}
}
};
}} // namespace detail::overlay
#endif // DOXYGEN_NO_DETAIL
}} // namespace boost::geometry
#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_CONVERT_RING_HPP
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