86 lines
2.5 KiB
C++
86 lines
2.5 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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// mapnik
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#include <mapnik/vertex.hpp>
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// stl
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#include <vector>
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#include <tuple>
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namespace detail {
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template<typename T>
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struct fake_path
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{
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using coord_type = std::tuple<T, T, unsigned>;
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using cont_type = std::vector<coord_type>;
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cont_type vertices_;
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typename cont_type::iterator itr_;
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fake_path(std::initializer_list<T> l)
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: fake_path(l.begin(), l.size())
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{}
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fake_path(std::vector<T> const& v, bool make_invalid = false)
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: fake_path(v.begin(), v.size(), make_invalid)
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{}
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template<typename Itr>
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fake_path(Itr itr, size_t sz, bool make_invalid = false)
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{
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size_t num_coords = sz >> 1;
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vertices_.reserve(num_coords + (make_invalid ? 1 : 0));
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if (make_invalid)
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{
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vertices_.push_back(std::make_tuple(0, 0, mapnik::SEG_END));
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}
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for (size_t i = 0; i < num_coords; ++i)
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{
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T x = *itr++;
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T y = *itr++;
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unsigned cmd = (i == 0) ? mapnik::SEG_MOVETO : mapnik::SEG_LINETO;
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vertices_.push_back(std::make_tuple(x, y, cmd));
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}
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itr_ = vertices_.begin();
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}
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unsigned vertex(T* x, T* y)
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{
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if (itr_ == vertices_.end())
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{
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return mapnik::SEG_END;
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}
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*x = std::get<0>(*itr_);
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*y = std::get<1>(*itr_);
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unsigned cmd = std::get<2>(*itr_);
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++itr_;
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return cmd;
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}
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void rewind(unsigned) { itr_ = vertices_.begin(); }
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};
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} // namespace detail
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using fake_path = detail::fake_path<double>;
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