127 lines
4 KiB
C++
127 lines
4 KiB
C++
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/*****************************************************************************
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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) 2006 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 <iostream>
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#include <fstream>
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#include <stdexcept>
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#include <mapnik/geom_util.hpp>
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#include <mapnik/query.hpp>
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#include "osm_datasource.hpp"
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#include "osm_featureset.hpp"
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#include <set>
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DATASOURCE_PLUGIN(osm_datasource)
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using mapnik::String;
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using mapnik::Double;
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using mapnik::Integer;
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using mapnik::datasource_exception;
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using mapnik::filter_in_box;
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using mapnik::filter_at_point;
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using mapnik::attribute_descriptor;
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const std::string osm_datasource::name_ = "osm";
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osm_datasource::osm_datasource(const parameters ¶ms)
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: datasource (params),
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type_(datasource::Vector),
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desc_(*params.get<std::string>("type"), *params.get<std::string>("encoding","utf-8"))
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{
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osm_data_ = new osm_dataset;
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std::string osm_filename= *params.get<std::string>("file","");
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std::string parser = *params.get<std::string>("parser","expat");
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// load the data
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if (osm_data_->load(osm_filename.c_str(),parser)==false)
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{
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throw datasource_exception("Error loading OSM data");
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}
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osm_data_->rewind();
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// Need code to get the attributes of all the data
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std::set<std::string> keys= osm_data_->get_keys();
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// Add the attributes to the datasource descriptor - assume they're
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// all of type String
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for(std::set<std::string>::iterator i=keys.begin(); i!=keys.end(); i++)
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desc_.add_descriptor(attribute_descriptor(*i,String));
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// Get the bounds of the data and set extent_ accordingly
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bounds b = osm_data_->get_bounds();
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extent_ = Envelope<double>(b.w,b.s,b.e,b.n);
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}
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osm_datasource::~osm_datasource() { delete osm_data_; }
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int osm_datasource::type() const
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{
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return type_;
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}
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layer_descriptor osm_datasource::get_descriptor() const
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{
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return desc_;
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}
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featureset_ptr osm_datasource::features(const query& q) const
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{
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filter_in_box filter(q.get_bbox());
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// so we need to filter osm features by bbox here...
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std::cout << "Box details" << filter.box_.minx()
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<< " " << filter.box_.miny() << " "
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<< filter.box_.maxx() <<" " << filter.box_.maxy() << std::endl;
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return featureset_ptr
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(new osm_featureset<filter_in_box>(filter,
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osm_data_,
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q.property_names(),
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desc_.get_encoding()));
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}
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featureset_ptr osm_datasource::features_at_point(coord2d const& pt) const
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{
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filter_at_point filter(pt);
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// collect all attribute names
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std::vector<attribute_descriptor> const& desc_vector =
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desc_.get_descriptors();
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std::vector<attribute_descriptor>::const_iterator itr = desc_vector.begin();
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std::vector<attribute_descriptor>::const_iterator end = desc_vector.end();
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std::set<std::string> names;
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while (itr != end)
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{
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names.insert(itr->get_name());
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++itr;
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}
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return featureset_ptr
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(new osm_featureset<filter_at_point>(filter,
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osm_data_,
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names,
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desc_.get_encoding()));
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}
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Envelope<double> osm_datasource::envelope() const
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{
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return extent_;
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}
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