111 lines
3.1 KiB
C++
111 lines
3.1 KiB
C++
// Boost.Geometry (aka GGL, Generic Geometry Library)
|
|
|
|
// Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
|
|
|
|
// This file was modified by Oracle on 2018-2020.
|
|
// Modifications copyright (c) 2018-2020, Oracle and/or its affiliates.
|
|
// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
|
|
|
|
// 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/range/algorithm/reverse.hpp>
|
|
|
|
#include <boost/geometry/algorithms/convert.hpp>
|
|
#include <boost/geometry/algorithms/num_points.hpp>
|
|
|
|
#include <boost/geometry/core/exterior_ring.hpp>
|
|
#include <boost/geometry/core/interior_rings.hpp>
|
|
#include <boost/geometry/core/static_assert.hpp>
|
|
#include <boost/geometry/core/tags.hpp>
|
|
|
|
namespace boost { namespace geometry
|
|
{
|
|
|
|
|
|
#ifndef DOXYGEN_NO_DETAIL
|
|
namespace detail { namespace overlay
|
|
{
|
|
|
|
|
|
template<typename Tag>
|
|
struct convert_ring
|
|
{
|
|
BOOST_GEOMETRY_STATIC_ASSERT_FALSE(
|
|
"Not or not yet implemented for this geometry Tag.",
|
|
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)
|
|
{
|
|
// TODO: resize and .size() and .back() should not be called here
|
|
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
|