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add centroid

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artemp 2015-03-05 22:30:38 +01:00
parent d682c5a201
commit 8411cdfa0c
1 changed files with 69 additions and 0 deletions
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include/mapnik/geometry_centroid.hpp Normal file
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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_impl.hpp>
#include <mapnik/geometry_adapters.hpp>
#include <boost/geometry/algorithms/centroid.hpp>
namespace mapnik { namespace new_geometry {
namespace detail {
struct geometry_centroid
{
using result_type = bool;
geometry_centroid(point & pt)
: pt_(pt) {}
result_type operator() (geometry const& geom) const
{
return mapnik::util::apply_visitor(*this, geom);
}
result_type operator() (geometry_collection const& collection) const
{
return false;
}
template <typename T>
result_type operator() (T const& geom) const
{
boost::geometry::centroid(geom, pt_);
return true;
}
point & pt_;
};
}
inline bool centroid(mapnik::new_geometry::geometry const& geom, point & pt)
{
return detail::geometry_centroid(pt) (geom);
}
}}
#endif // MAPNIK_GEOMETRY_CENTROID_HPP