95 lines
2.8 KiB
C++
95 lines
2.8 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) 2021 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_VIEW_STRATEGY_HPP
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#define MAPNIK_VIEW_STRATEGY_HPP
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// mapnik
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#include <mapnik/view_transform.hpp>
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#include <mapnik/safe_cast.hpp>
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// boost
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#include <boost/geometry/core/coordinate_type.hpp>
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#include <boost/geometry/core/access.hpp>
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namespace mapnik
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{
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struct view_strategy
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{
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view_strategy(view_transform const& tr)
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: tr_(tr) {}
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template <typename P1, typename P2>
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inline bool apply(P1 const& p1, P2 & p2) const
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{
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using coordinate_type = typename boost::geometry::coordinate_type<P2>::type;
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double x = boost::geometry::get<0>(p1);
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double y = boost::geometry::get<1>(p1);
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tr_.forward(&x,&y);
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boost::geometry::set<0>(p2, safe_cast<coordinate_type>(x));
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boost::geometry::set<1>(p2, safe_cast<coordinate_type>(y));
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return true;
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}
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template <typename P1, typename P2>
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inline P2 execute(P1 const& p1, bool & status) const
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{
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P2 p2;
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status = apply(p1, p2);
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return p2;
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}
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view_transform const& tr_;
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};
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struct unview_strategy
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{
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unview_strategy(view_transform const& tr)
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: tr_(tr) {}
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template <typename P1, typename P2>
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inline bool apply(P1 const& p1, P2 & p2) const
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{
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using coordinate_type = typename boost::geometry::coordinate_type<P2>::type;
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double x = boost::geometry::get<0>(p1);
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double y = boost::geometry::get<1>(p1);
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tr_.backward(&x,&y);
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boost::geometry::set<0>(p2, static_cast<coordinate_type>(x));
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boost::geometry::set<1>(p2, static_cast<coordinate_type>(y));
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return true;
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}
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template <typename P1, typename P2>
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inline P2 execute(P1 const& p1, bool & status) const
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{
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P2 p2;
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status = apply(p1, p2);
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return p2;
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}
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view_transform const& tr_;
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};
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}
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#endif // MAPNIK_VIEW_STRATEGY_HPP
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