132 lines
3.3 KiB
C++
132 lines
3.3 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) 2017 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_TRANSFORM_PATH_ADAPTER_HPP
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#define MAPNIK_TRANSFORM_PATH_ADAPTER_HPP
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#include <mapnik/proj_transform.hpp>
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#include <mapnik/vertex.hpp>
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#include <mapnik/config.hpp>
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#include <cstddef>
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namespace mapnik {
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template <typename Transform, typename Geometry>
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struct transform_path_adapter
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{
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// SFINAE value_type detector
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template <typename T>
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struct void_type
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{
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using type = void;
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};
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template <typename T, typename D, typename _ = void>
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struct select_value_type
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{
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using type = D;
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};
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template <typename T, typename D>
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struct select_value_type<T, D, typename void_type<typename T::value_type>::type>
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{
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using type = typename T::value_type;
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};
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using size_type = std::size_t;
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using value_type = typename select_value_type<Geometry, void>::type;
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transform_path_adapter(Transform const& _t,
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Geometry & _geom,
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proj_transform const& prj_trans)
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: t_(&_t),
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geom_(_geom),
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prj_trans_(&prj_trans) {}
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explicit transform_path_adapter(Geometry & _geom)
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: t_(0),
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geom_(_geom),
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prj_trans_(0) {}
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void set_proj_trans(proj_transform const& prj_trans)
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{
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prj_trans_ = &prj_trans;
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}
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void set_trans(Transform const& t)
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{
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t_ = &t;
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}
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unsigned vertex(double *x, double *y) const
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{
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unsigned command;
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bool ok = false;
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bool skipped_points = false;
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while (!ok)
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{
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command = geom_.vertex(x,y);
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if (command == SEG_END || command == SEG_CLOSE)
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{
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return command;
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}
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double z=0;
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ok = prj_trans_->backward(*x, *y, z);
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if (!ok) {
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skipped_points = true;
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}
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}
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if (skipped_points && (command == SEG_LINETO))
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{
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command = SEG_MOVETO;
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}
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t_->forward(x,y);
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return command;
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}
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void rewind(unsigned pos) const
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{
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geom_.rewind(pos);
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}
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unsigned type() const
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{
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return static_cast<unsigned>(geom_.type());
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}
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Geometry const& geom() const
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{
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return geom_;
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}
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private:
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Transform const* t_;
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Geometry & geom_;
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proj_transform const* prj_trans_;
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};
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}
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#endif // MAPNIK_TRANSFORM_PATH_ADAPTER_HPP
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