94 lines
3.2 KiB
C++
94 lines
3.2 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) 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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// mapnik
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#include <mapnik/image_reader.hpp>
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#include <mapnik/image_util.hpp>
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#include "raster_featureset.hpp"
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using mapnik::query;
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using mapnik::CoordTransform;
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using mapnik::ImageReader;
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using mapnik::Feature;
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using mapnik::feature_ptr;
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using mapnik::ImageData32;
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using mapnik::raster;
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template <typename LookupPolicy>
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raster_featureset<LookupPolicy>::raster_featureset(LookupPolicy const& policy,
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Envelope<double> const& extent,
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query const& q)
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: policy_(policy),
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id_(1),
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extent_(extent),
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bbox_(q.get_bbox()),
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curIter_(policy_.begin()),
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endIter_(policy_.end())
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{}
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template <typename LookupPolicy>
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raster_featureset<LookupPolicy>::~raster_featureset() {}
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template <typename LookupPolicy>
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feature_ptr raster_featureset<LookupPolicy>::next()
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{
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if (curIter_!=endIter_)
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{
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feature_ptr feature(new Feature(++id_));
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try
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{
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std::auto_ptr<ImageReader> reader(mapnik::get_image_reader(curIter_->file(),curIter_->format()));
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#ifdef MAPNIK_DEBUG
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std::cout << "Raster Plugin: READER = " << curIter_->format() << " " << curIter_->file()
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<< " size(" << curIter_->width() << "," << curIter_->height() << ")\n";
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#endif
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if (reader.get())
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{
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int image_width=reader->width();
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int image_height=reader->height();
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if (image_width>0 && image_height>0)
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{
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CoordTransform t(image_width,image_height,extent_,0,0);
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Envelope<double> intersect=bbox_.intersect(curIter_->envelope());
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Envelope<double> ext=t.forward(intersect);
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ImageData32 image(int(ext.width()+0.5),int(ext.height()+0.5));
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reader->read(int(ext.minx()+0.5),int(ext.miny()+0.5),image);
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feature->set_raster(mapnik::raster_ptr(new raster(intersect,image)));
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}
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}
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}
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catch (...)
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{
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std::cerr << "Raster Plugin: Exception caught\n";
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}
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++curIter_;
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return feature;
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}
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return feature_ptr();
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}
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template class raster_featureset<single_file_policy>;
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template class raster_featureset<tiled_file_policy>;
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