65 lines
2.2 KiB
C++
65 lines
2.2 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) 2013 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_SYMBOLIZER_HASH_HPP
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#define MAPNIK_SYMBOLIZER_HASH_HPP
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#include <mapnik/map.hpp>
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#include <mapnik/feature_type_style.hpp>
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#include <boost/functional/hash.hpp>
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#include <boost/variant/static_visitor.hpp>
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namespace mapnik {
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struct symbolizer_hash
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{
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template <typename T>
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static std::size_t value(T const& /*sym*/)
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{
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return 0;
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}
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// specialisation for polygon_symbolizer
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static std::size_t value(polygon_symbolizer const& sym)
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{
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std::size_t seed = Polygon;
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boost::hash_combine(seed, sym.get_fill().rgba());
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boost::hash_combine(seed, sym.get_opacity());
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return seed;
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}
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// specialisation for line_symbolizer
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static std::size_t value(line_symbolizer const& sym)
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{
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std::size_t seed = LineString;
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boost::hash_combine(seed, sym.get_stroke().get_color().rgba());
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boost::hash_combine(seed, sym.get_stroke().get_width());
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boost::hash_combine(seed, sym.get_stroke().get_opacity());
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boost::hash_combine(seed, static_cast<int>(sym.get_stroke().get_line_cap()));
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boost::hash_combine(seed, static_cast<int>(sym.get_stroke().get_line_join()));
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return seed;
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}
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};
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}
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#endif // MAPNIK_SYMBOLIZER_HASH_HPP
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