165 lines
5 KiB
C++
165 lines
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) 2012 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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#include "geojson_datasource.hpp"
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#include "geojson_featureset.hpp"
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#include <fstream>
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#include <iostream>
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// boost
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#include <boost/make_shared.hpp>
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#include <boost/algorithm/string.hpp>
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#include <boost/spirit/include/support_multi_pass.hpp>
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#include <boost/foreach.hpp>
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#include <boost/geometry/geometries/box.hpp>
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#include <boost/geometry/geometries/geometries.hpp>
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#include <boost/geometry.hpp>
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#include <boost/geometry/extensions/index/rtree/rtree.hpp>
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// mapnik
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#include <mapnik/box2d.hpp>
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#include <mapnik/proj_transform.hpp>
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#include <mapnik/projection.hpp>
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#include <mapnik/json/feature_collection_parser.hpp>
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using mapnik::datasource;
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using mapnik::parameters;
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DATASOURCE_PLUGIN(geojson_datasource)
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geojson_datasource::geojson_datasource(parameters const& params, bool bind)
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: datasource(params),
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type_(datasource::Vector),
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desc_(*params_.get<std::string>("type"),
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*params_.get<std::string>("encoding","utf-8")),
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file_(*params_.get<std::string>("file","")),
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extent_(),
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tr_(new mapnik::transcoder(*params_.get<std::string>("encoding","utf-8"))),
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features_(),
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tree_(16,1)
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{
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if (file_.empty()) throw mapnik::datasource_exception("GeoJSON Plugin: missing <file> parameter");
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if (bind)
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{
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this->bind();
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}
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}
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void geojson_datasource::bind() const
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{
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if (is_bound_) return;
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typedef std::istreambuf_iterator<char> base_iterator_type;
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std::ifstream is(file_.c_str());
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boost::spirit::multi_pass<base_iterator_type> begin =
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boost::spirit::make_default_multi_pass(base_iterator_type(is));
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boost::spirit::multi_pass<base_iterator_type> end =
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boost::spirit::make_default_multi_pass(base_iterator_type());
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mapnik::context_ptr ctx = boost::make_shared<mapnik::context_type>();
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mapnik::json::feature_collection_parser<boost::spirit::multi_pass<base_iterator_type> > p(ctx,*tr_);
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bool result = p.parse(begin,end, features_);
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if (!result)
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{
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MAPNIK_LOG_WARN(geojson) << "geojson_datasource: Failed parse GeoJSON file " << file_;
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return;
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}
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bool first = true;
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std::size_t count=0;
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BOOST_FOREACH (mapnik::feature_ptr f, features_)
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{
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mapnik::box2d<double> const& box = f->envelope();
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if (first)
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{
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extent_ = box;
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first = false;
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}
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else
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{
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extent_.expand_to_include(box);
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}
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tree_.insert(box_type(point_type(box.minx(),box.miny()),point_type(box.maxx(),box.maxy())), count++);
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}
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is_bound_ = true;
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}
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geojson_datasource::~geojson_datasource() { }
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std::string const geojson_datasource::name_="geojson";
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std::string geojson_datasource::name()
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{
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return name_;
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}
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boost::optional<mapnik::datasource::geometry_t> geojson_datasource::get_geometry_type() const
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{
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return boost::optional<mapnik::datasource::geometry_t>();
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}
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mapnik::datasource::datasource_t geojson_datasource::type() const
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{
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return type_;
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}
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std::map<std::string, mapnik::parameters> geojson_datasource::get_statistics() const
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{
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return statistics_;
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}
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mapnik::box2d<double> geojson_datasource::envelope() const
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{
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if (!is_bound_) bind();
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return extent_;
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}
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mapnik::layer_descriptor geojson_datasource::get_descriptor() const
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{
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if (!is_bound_) bind();
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return desc_;
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}
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mapnik::featureset_ptr geojson_datasource::features(mapnik::query const& q) const
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{
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if (!is_bound_) bind();
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// if the query box intersects our world extent then query for features
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mapnik::box2d<double> const& b = q.get_bbox();
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if (extent_.intersects(b))
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{
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box_type box(point_type(b.minx(),b.miny()),point_type(b.maxx(),b.maxy()));
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index_array_ = tree_.find(box);
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return boost::make_shared<geojson_featureset>(features_, index_array_.begin(), index_array_.end());
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}
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// otherwise return an empty featureset pointer
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return mapnik::featureset_ptr();
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}
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// FIXME
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mapnik::featureset_ptr geojson_datasource::features_at_point(mapnik::coord2d const& pt) const
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{
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if (!is_bound_) bind();
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return mapnik::featureset_ptr();
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}
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