/usr/include/mapnik/geometry_centroid.hpp is in libmapnik-dev 3.0.9+ds-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2015 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
#ifndef MAPNIK_GEOMETRY_CENTROID_HPP
#define MAPNIK_GEOMETRY_CENTROID_HPP
#include <mapnik/geometry.hpp>
#include <mapnik/geometry_adapters.hpp>
#include <boost/geometry/algorithms/centroid.hpp>
#include <mapnik/geometry_is_empty.hpp>
#include <mapnik/geometry_remove_empty.hpp>
namespace mapnik { namespace geometry {
namespace detail {
template <typename T>
struct geometry_centroid
{
using result_type = bool;
geometry_centroid(point<T> & pt)
: pt_(pt) {}
template <typename T1>
result_type operator() (T1 const& geom) const
{
return util::apply_visitor(*this, geom);
}
result_type operator() (geometry_empty const&) const
{
return false;
}
result_type operator() (geometry_collection<T> const&) const
{
return false;
}
result_type operator() (point<T> const& geom) const
{
return centroid_simple(geom);
}
result_type operator() (line_string<T> const& geom) const
{
return centroid_simple(geom);
}
result_type operator() (polygon<T> const& geom) const
{
return centroid_simple(geom);
}
result_type operator() (multi_point<T> const& geom) const
{
return centroid_simple(geom);
}
result_type operator() (multi_line_string<T> const& geom) const
{
return centroid_multi(geom);
}
result_type operator() (multi_polygon<T> const& geom) const
{
return centroid_multi(geom);
}
point<T> & pt_;
private:
template <typename Geom>
result_type centroid_simple(Geom const & geom) const
{
try
{
boost::geometry::centroid(geom, pt_);
return true;
}
catch (boost::geometry::centroid_exception const & e)
{
return false;
}
}
template <typename Geom>
result_type centroid_multi(Geom const & geom) const
{
// https://github.com/mapnik/mapnik/issues/3169
#if BOOST_VERSION <= 105900
if (mapnik::geometry::has_empty(geom))
{
Geom stripped = mapnik::geometry::remove_empty(geom);
return centroid_simple(stripped);
}
#endif
return centroid_simple(geom);
}
};
}
template <typename T1, typename T2>
inline bool centroid(T1 const& geom, point<T2> & pt)
{
return detail::geometry_centroid<T2>(pt)(geom);
}
}}
#endif // MAPNIK_GEOMETRY_CENTROID_HPP
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