144 lines
4.7 KiB
C++
144 lines
4.7 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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// mapnik
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#include <mapnik/feature.hpp>
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#include <mapnik/feature_factory.hpp>
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// stl
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#include <string>
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#include <vector>
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#include <fstream>
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// boost
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#include <boost/variant/static_visitor.hpp>
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#include <boost/variant/apply_visitor.hpp>
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#include <boost/range/adaptor/reversed.hpp>
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#include "topojson_featureset.hpp"
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namespace mapnik { namespace topojson {
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template <typename Context>
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struct feature_generator : public boost::static_visitor<mapnik::feature_ptr>
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{
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feature_generator(Context & ctx, topology const& topo, std::size_t feature_id)
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: ctx_(ctx),
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topo_(topo),
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feature_id_(feature_id) {}
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feature_ptr operator() (point const& pt) const
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{
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return feature_ptr();
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}
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feature_ptr operator() (linestring const& line) const
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{
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return feature_ptr();
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}
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feature_ptr operator() (polygon const& poly) const
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{
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mapnik::feature_ptr feature(mapnik::feature_factory::create(ctx_,feature_id_));
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std::unique_ptr<geometry_type> poly_ptr(new geometry_type(geometry_type::types::Polygon));
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for (auto const& ring : poly.rings)
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{
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bool first = true;
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for (auto const& index : ring)
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{
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double px = 0, py = 0;
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bool reversed = index < 0;
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index_type arc_index = reversed ? std::abs(index) - 1 : index;
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auto const& coords = topo_.arcs[arc_index].coordinates;
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std::deque<mapnik::topojson::coordinate> processed_coords;
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for (auto const& pt : coords )
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{
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double x = pt.x;
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double y = pt.y;
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if (topo_.tr)
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{
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x = (px += x) * (*topo_.tr).scale_x + (*topo_.tr).translate_x;
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y = (py += y) * (*topo_.tr).scale_y + (*topo_.tr).translate_y;
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}
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if (reversed)
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processed_coords.emplace_front(coordinate{x,y});
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else
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processed_coords.emplace_back(coordinate{x,y});
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}
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for (auto const& c : processed_coords)
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{
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if (first)
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{
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first = false;
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poly_ptr->move_to(c.x,c.y);
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}
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else poly_ptr->line_to(c.x,c.y);
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}
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}
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poly_ptr->close_path();
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}
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feature->paths().push_back(poly_ptr.release());
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return feature;
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}
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template<typename T>
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feature_ptr operator() (T const& ) const
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{
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return feature_ptr();
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}
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Context & ctx_;
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topology const& topo_;
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std::size_t feature_id_;
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};
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}}
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topojson_featureset::topojson_featureset(mapnik::topojson::topology const& topo,
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std::deque<std::size_t>::const_iterator index_itr,
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std::deque<std::size_t>::const_iterator index_end)
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: ctx_(std::make_shared<mapnik::context_type>()),
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topo_(topo),
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index_itr_(index_itr),
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index_end_(index_end),
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feature_id_ (0) {}
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topojson_featureset::~topojson_featureset() {}
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mapnik::feature_ptr topojson_featureset::next()
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{
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if (index_itr_ != index_end_)
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{
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std::size_t index = *index_itr_++;
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if ( index < topo_.geometries.size())
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{
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mapnik::topojson::geometry const& geom = topo_.geometries[index];
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mapnik::feature_ptr feature = boost::apply_visitor(
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mapnik::topojson::feature_generator<mapnik::context_ptr>(ctx_, topo_, feature_id_++),
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geom);
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return feature;
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}
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}
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return mapnik::feature_ptr();
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}
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