166 lines
4 KiB
C++
166 lines
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_TO_PATH_HPP
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#define MAPNIK_GEOMETRY_TO_PATH_HPP
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#include <mapnik/geometry.hpp>
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#include <mapnik/path.hpp>
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namespace mapnik { namespace geometry { namespace detail {
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//template <typename Transformer>
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struct geometry_to_path
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{
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geometry_to_path(path_type & p)
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: p_(p) {}
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template <typename T>
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void operator() (geometry<T> const& geom) const
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{
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mapnik::util::apply_visitor(*this, geom);
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}
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void operator() (geometry_empty const&) const
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{
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// no-op
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}
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// point
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template <typename T>
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void operator() (point<T> const& pt) const
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{
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//point pt_new;
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//Transformer::apply(pt, pt_new);
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p_.move_to(pt.x, pt.y);
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}
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// line_string
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template <typename T>
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void operator() (line_string<T> const& line) const
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{
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bool first = true;
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for (auto const& pt : line)
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{
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//point pt_new;
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//Transformer::apply(pt, pt_new);
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if (first) { p_.move_to(pt.x, pt.y); first=false;}
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else p_.line_to(pt.x, pt.y);
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}
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}
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// polygon
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template <typename T>
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void operator() (polygon<T> const& poly) const
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{
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// exterior
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bool first = true;
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for (auto const& pt : poly.exterior_ring)
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{
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if (first)
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{
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p_.move_to(pt.x, pt.y);
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first=false;
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}
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else
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{
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p_.line_to(pt.x, pt.y);
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}
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}
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if (!first)
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{
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p_.close_path();
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}
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// interior
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for (auto const& ring : poly.interior_rings)
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{
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first = true;
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for (auto const& pt : ring)
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{
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if (first) {
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p_.move_to(pt.x, pt.y);
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first=false;
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}
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else
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{
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p_.line_to(pt.x, pt.y);
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}
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}
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if (!first)
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{
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p_.close_path();
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}
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}
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}
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// multi point
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template <typename T>
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void operator() (multi_point<T> const& multi_pt) const
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{
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for (auto const& pt : multi_pt)
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{
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(*this)(pt);
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}
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}
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// multi_line_string
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template <typename T>
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void operator() (multi_line_string<T> const& multi_line) const
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{
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for (auto const& line : multi_line)
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{
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(*this)(line);
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}
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}
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// multi_polygon
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template <typename T>
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void operator() (multi_polygon<T> const& multi_poly) const
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{
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for (auto const& poly : multi_poly)
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{
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(*this)(poly);
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}
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}
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template <typename T>
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void 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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(*this)(geom);
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}
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}
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path_type & p_;
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};
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} // ns detail
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template <typename T>
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void to_path(T const& geom, path_type & p)
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{
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detail::geometry_to_path func(p);
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func(geom);
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}
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}}
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#endif // MAPNIK_GEOMETRY_TO_PATH_HPP
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