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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2011 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
// mapnik
#include <mapnik/geometry.hpp>
#include <mapnik/feature.hpp>
#include <mapnik/feature_factory.hpp>
#include <mapnik/debug.hpp>
#include <mapnik/unicode.hpp>
// boost
#include <boost/make_shared.hpp>
#include "osm_featureset.hpp"
using mapnik::feature_ptr;
using mapnik::geometry_type;
using mapnik::feature_factory;
template <typename filterT>
osm_featureset<filterT>::osm_featureset(const filterT& filter,
osm_dataset* dataset,
const std::set<std::string>&
attribute_names,
std::string const& encoding)
: filter_(filter),
query_ext_(),
tr_(new transcoder(encoding)),
dataset_ (dataset),
attribute_names_ (attribute_names),
ctx_(boost::make_shared<mapnik::context_type>())
{
dataset_->rewind();
}
template <typename filterT>
feature_ptr osm_featureset<filterT>::next()
{
feature_ptr feature;
osm_item* cur_item = dataset_->next_item();
if (!cur_item) return feature_ptr();
if (dataset_->current_item_is_node())
{
feature = feature_factory::create(ctx_, cur_item->id);
double lat = static_cast<osm_node*>(cur_item)->lat;
double lon = static_cast<osm_node*>(cur_item)->lon;
geometry_type* point = new geometry_type(mapnik::Point);
point->move_to(lon, lat);
feature->add_geometry(point);
}
else if (dataset_->current_item_is_way())
{
// Loop until we find a feature which passes the filter
while (cur_item)
{
bounds b = static_cast<osm_way*>(cur_item)->get_bounds();
if (filter_.pass(box2d<double>(b.w, b.s, b.e, b.n))
&&
static_cast<osm_way*>(cur_item)->nodes.size()) break;
cur_item = dataset_->next_item();
}
if (!cur_item) return feature_ptr();
feature = feature_factory::create(ctx_, cur_item->id);
geometry_type* geom;
if (static_cast<osm_way*>(cur_item)->is_polygon())
{
geom = new geometry_type(mapnik::Polygon);
}
else
{
geom = new geometry_type(mapnik::LineString);
}
geom->move_to(static_cast<osm_way*>(cur_item)->nodes[0]->lon,
static_cast<osm_way*>(cur_item)->nodes[0]->lat);
for (unsigned int count = 1;
count < static_cast<osm_way*>(cur_item)->nodes.size();
count++)
{
geom->line_to(static_cast<osm_way*>(cur_item)->nodes[count]->lon,
static_cast<osm_way*>(cur_item)->nodes[count]->lat);
}
feature->add_geometry(geom);
}
else
{
MAPNIK_LOG_ERROR(osm_featureset) << "Current item is neither node nor way.\n";
}
std::set<std::string>::const_iterator itr = attribute_names_.begin();
std::set<std::string>::const_iterator end = attribute_names_.end();
std::map<std::string,std::string>::iterator end_keyvals = cur_item->keyvals.end();
for (; itr != end; itr++)
{
std::map<std::string,std::string>::iterator i = cur_item->keyvals.find(*itr);
if (i != end_keyvals)
{
feature->put_new(i->first, tr_->transcode(i->second.c_str()));
}
}
return feature;
}
template <typename filterT>
osm_featureset<filterT>::~osm_featureset() {}
template class osm_featureset<mapnik::filter_in_box>;
template class osm_featureset<mapnik::filter_at_point>;
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