150 lines
5.2 KiB
C++
150 lines
5.2 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) 2011 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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// stl
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#include <iostream>
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// mapnik
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#include <mapnik/geometry.hpp>
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#include <mapnik/feature_factory.hpp>
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#include "osm_featureset.hpp"
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using mapnik::Feature;
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using mapnik::feature_ptr;
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using mapnik::geometry_type;
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using mapnik::feature_factory;
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template <typename filterT>
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osm_featureset<filterT>::osm_featureset(const filterT& filter,
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osm_dataset* dataset,
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const std::set<std::string>&
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attribute_names,
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std::string const& encoding)
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: filter_(filter),
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query_ext_(),
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tr_(new transcoder(encoding)),
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feature_id_(1),
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dataset_ (dataset),
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attribute_names_ (attribute_names),
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ctx_(boost::make_shared<mapnik::context_type>())
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{
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dataset_->rewind();
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}
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template <typename filterT>
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feature_ptr osm_featureset<filterT>::next()
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{
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feature_ptr feature;
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bool success = false;
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osm_item* cur_item = dataset_->next_item();
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if (cur_item != NULL)
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{
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if (dataset_->current_item_is_node())
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{
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feature = feature_factory::create(ctx_,feature_id_);
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++feature_id_;
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double lat = static_cast<osm_node*>(cur_item)->lat;
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double lon = static_cast<osm_node*>(cur_item)->lon;
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geometry_type* point = new geometry_type(mapnik::Point);
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point->move_to(lon, lat);
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feature->add_geometry(point);
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success = true;
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}
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else if (dataset_->current_item_is_way())
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{
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bounds b = static_cast<osm_way*>(cur_item)->get_bounds();
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// Loop until we find a feature which passes the filter
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while (cur_item != NULL &&
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! filter_.pass(box2d<double>(b.w, b.s, b.e, b.n)))
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{
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cur_item = dataset_->next_item();
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if (cur_item != NULL)
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{
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b = static_cast<osm_way*>(cur_item)->get_bounds();
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}
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}
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if (cur_item != NULL)
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{
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if (static_cast<osm_way*>(cur_item)->nodes.size())
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{
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feature = feature_factory::create(ctx_,feature_id_);
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++feature_id_;
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geometry_type* geom;
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if (static_cast<osm_way*>(cur_item)->is_polygon())
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{
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geom = new geometry_type(mapnik::Polygon);
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}
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else
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{
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geom = new geometry_type(mapnik::LineString);
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}
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geom->move_to(static_cast<osm_way*>(cur_item)->nodes[0]->lon,
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static_cast<osm_way*>(cur_item)->nodes[0]->lat);
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for (unsigned int count = 1;
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count < static_cast<osm_way*>(cur_item)->nodes.size();
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count++)
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{
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geom->line_to(static_cast<osm_way*>(cur_item)->nodes[count]->lon,
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static_cast<osm_way*>(cur_item)->nodes[count]->lat);
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}
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feature->add_geometry(geom);
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success = true;
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}
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}
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}
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// can feature_ptr be compared to NULL? - no
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if (success)
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{
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std::map<std::string,std::string>::iterator i = cur_item->keyvals.begin();
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// add the keyvals to the feature. the feature seems to be a map
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// of some sort so this should work - see dbf_file::add_attribute()
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while (i != cur_item->keyvals.end())
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{
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// only add if in the specified set of attribute names
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if (attribute_names_.find(i->first) != attribute_names_.end())
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{
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feature->put(i->first,tr_->transcode(i->second.c_str()));
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}
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i++;
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}
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return feature;
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}
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}
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return feature_ptr();
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}
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template <typename filterT>
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osm_featureset<filterT>::~osm_featureset() {}
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template class osm_featureset<mapnik::filter_in_box>;
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template class osm_featureset<mapnik::filter_at_point>;
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