149 lines
4.4 KiB
C++
149 lines
4.4 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2015 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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#ifndef MAPNIK_GEOMETRY_IS_SIMPLE_HPP
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#define MAPNIK_GEOMETRY_IS_SIMPLE_HPP
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#include <boost/version.hpp>
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// only Boost >= 1.56 contains the is_simple function
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#if BOOST_VERSION >= 105600
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#include <mapnik/geometry.hpp>
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#include <mapnik/geometry_adapters.hpp>
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#include <boost/geometry/algorithms/is_simple.hpp>
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namespace mapnik { namespace geometry {
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namespace detail {
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struct geometry_is_simple : public util::static_visitor<bool>
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{
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using result_type = bool;
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template <typename T>
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result_type operator() (geometry<T> const& geom) const
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{
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return mapnik::util::apply_visitor(*this, geom);
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}
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result_type operator() (geometry_empty const& ) const
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{
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// An empty geometry has no anomalous geometric points, such as self intersection or self tangency.
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// Therefore, we will return true
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return true;
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}
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template <typename T>
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result_type operator() (geometry_collection<T> const& collection) const
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{
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for (auto const& geom : collection)
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{
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if ( !(*this)(geom)) return false;
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}
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return true;
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}
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template <typename T>
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result_type operator() (point<T> const& pt) const
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{
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return boost::geometry::is_simple(pt);
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}
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template <typename T>
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result_type operator() (line_string<T> const& line) const
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{
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if (line.empty())
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{
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// Prevent an empty line_string from segfaulting in boost geometry 1.58
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// once it is fixed this can be removed
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// https://svn.boost.org/trac/boost/ticket/11709
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return true;
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}
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return boost::geometry::is_simple(line);
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}
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template <typename T>
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result_type operator() (polygon<T> const& poly) const
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{
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return boost::geometry::is_simple(poly);
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}
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template <typename T>
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result_type operator() (multi_point<T> const& multi_pt) const
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{
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if (multi_pt.empty())
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{
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// This return is due to bug in boost geometry once it is fixed it can be removed
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// https://svn.boost.org/trac/boost/ticket/11710
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return true;
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}
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return boost::geometry::is_simple(multi_pt);
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}
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template <typename T>
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result_type operator() (multi_line_string<T> const& multi_line) const
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{
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if (multi_line.empty())
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{
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// This return is due to bug in boost geometry once it is fixed it can be removed
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// https://svn.boost.org/trac/boost/ticket/11710
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return true;
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}
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for (auto const& line : multi_line)
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{
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if (!(*this)(line)) return false;
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}
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return true;
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}
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template <typename T>
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result_type operator() (multi_polygon<T> const& multi_poly) const
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{
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if (multi_poly.empty())
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{
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// This return is due to bug in boost geometry once it is fixed it can be removed
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// https://svn.boost.org/trac/boost/ticket/11710
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return true;
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}
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for (auto const& poly : multi_poly)
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{
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if (!(*this)(poly)) return false;
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}
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return true;
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}
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};
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}
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template <typename T>
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inline bool is_simple(T const& geom)
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{
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return detail::geometry_is_simple() (geom);
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}
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template <typename T>
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inline bool is_simple(mapnik::geometry::geometry<T> const& geom)
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{
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return util::apply_visitor(detail::geometry_is_simple(), geom);
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}
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}}
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#endif // BOOST_VERSION >= 1.56
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#endif // MAPNIK_GEOMETRY_IS_SIMPLE_HPP
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