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| /***************************************************************************** | ||
| * | ||
| * This file is part of Mapnik (c++ mapping toolkit) | ||
| * | ||
| * Copyright (C) 2014 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 | ||
| * | ||
| *****************************************************************************/ | ||
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| #ifndef MAPNIK_VECTOR_TILE_STRATEGY_HPP | ||
| #define MAPNIK_VECTOR_TILE_STRATEGY_HPP | ||
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| // mapnik | ||
| #include <mapnik/config.hpp> | ||
| #include <mapnik/util/noncopyable.hpp> | ||
| #include <mapnik/proj_transform.hpp> | ||
| #include <mapnik/view_transform.hpp> | ||
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| #pragma GCC diagnostic push | ||
| #pragma GCC diagnostic ignored "-Wunused-parameter" | ||
| #pragma GCC diagnostic ignored "-Wunused-local-typedef" | ||
| #include <boost/geometry/core/coordinate_type.hpp> | ||
| #include <boost/geometry/core/access.hpp> | ||
| #include <boost/numeric/conversion/cast.hpp> | ||
| #pragma GCC diagnostic pop | ||
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| namespace mapnik { | ||
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| namespace vector_tile_impl { | ||
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| struct vector_tile_strategy | ||
| { | ||
| vector_tile_strategy(proj_transform const& prj_trans, | ||
| view_transform const& tr, | ||
| double scaling) | ||
| : prj_trans_(prj_trans), | ||
| tr_(tr), | ||
| scaling_(scaling) {} | ||
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| template <typename P1, typename P2> | ||
| inline bool apply(P1 const& p1, P2 & p2) const | ||
| { | ||
| using p2_type = typename boost::geometry::coordinate_type<P2>::type; | ||
| double x = boost::geometry::get<0>(p1); | ||
| double y = boost::geometry::get<1>(p1); | ||
| double z = 0.0; | ||
| if (!prj_trans_.backward(x, y, z)) return false; | ||
| tr_.forward(&x,&y); | ||
| x = x * scaling_; | ||
| y = y * scaling_; | ||
| x = std::floor(x + 0.5); | ||
| y = std::floor(y + 0.5); | ||
| boost::geometry::set<0>(p2, static_cast<p2_type>(x)); | ||
| boost::geometry::set<1>(p2, static_cast<p2_type>(y)); | ||
| return true; | ||
| } | ||
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| template <typename P1, typename P2> | ||
| inline P2 execute(P1 const& p1, bool & status) const | ||
| { | ||
| P2 p2; | ||
| status = apply(p1, p2); | ||
| return p2; | ||
| } | ||
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| proj_transform const& prj_trans_; | ||
| view_transform const& tr_; | ||
| double const scaling_; | ||
| }; | ||
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| } | ||
| } | ||
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| #endif // MAPNIK_VECTOR_TILE_STRATEGY_HPP |
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