102 lines
3.1 KiB
C++
102 lines
3.1 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) 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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#ifndef MAPNIK_MEMORY_FEATURESET_HPP
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#define MAPNIK_MEMORY_FEATURESET_HPP
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// mapnik
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#include <mapnik/datasource.hpp>
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#include <mapnik/memory_datasource.hpp>
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#include <mapnik/feature.hpp>
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#include <mapnik/raster.hpp>
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// boost
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#include <boost/utility.hpp>
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namespace mapnik {
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class memory_featureset : public Featureset
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{
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public:
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memory_featureset(box2d<double> const& bbox, memory_datasource const& ds, bool bbox_check = true)
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: bbox_(bbox),
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pos_(ds.features_.begin()),
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end_(ds.features_.end()),
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type_(ds.type()),
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bbox_check_(bbox_check)
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{}
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memory_featureset(box2d<double> const& bbox, std::vector<feature_ptr> const& features, bool bbox_check = true)
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: bbox_(bbox),
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pos_(features.begin()),
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end_(features.end()),
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type_(datasource::Vector),
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bbox_check_(bbox_check)
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{}
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virtual ~memory_featureset() {}
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feature_ptr next()
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{
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while (pos_ != end_)
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{
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if (!bbox_check_)
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{
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return *pos_++;
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}
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else
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{
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if (type_ == datasource::Raster)
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{
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raster_ptr const& source = (*pos_)->get_raster();
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if (source && bbox_.intersects(source->ext_))
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{
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return *pos_++;
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}
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}
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else
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{
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for (unsigned i=0; i<(*pos_)->num_geometries();++i)
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{
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geometry_type & geom = (*pos_)->get_geometry(i);
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if (bbox_.intersects(geom.envelope()))
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{
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return *pos_++;
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}
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}
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}
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++pos_;
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}
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}
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return feature_ptr();
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}
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private:
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box2d<double> bbox_;
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std::vector<feature_ptr>::const_iterator pos_;
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std::vector<feature_ptr>::const_iterator end_;
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datasource::datasource_t type_;
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bool bbox_check_;
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};
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}
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#endif // MAPNIK_MEMORY_FEATURESET_HPP
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