82 lines
2.8 KiB
C++
82 lines
2.8 KiB
C++
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/* This file is part of Mapnik (c++ mapping toolkit)
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* Copyright (C) 2005 Artem Pavlenko
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*
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* Mapnik is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "raster_featureset.hh"
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#include "image_reader.hh"
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template <typename LookupPolicy>
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RasterFeatureset<LookupPolicy>::RasterFeatureset(const LookupPolicy& policy,
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const Envelope<double>& box,
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const CoordTransform& t)
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: policy_(policy),
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id_(1),
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extent_(box),
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t_(t),
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curIter_(policy_.query(box)),
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endIter_(policy_.end())
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{}
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template <typename LookupPolicy>
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RasterFeatureset<LookupPolicy>::~RasterFeatureset() {}
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template <typename LookupPolicy>
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Feature* RasterFeatureset<LookupPolicy>::next()
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{
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Feature* f=0;
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if (curIter_!=endIter_)
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{
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try
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{
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std::cout<<"RasterFeatureset "<<curIter_->format()<<" "<<curIter_->file()<<std::endl;
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std::auto_ptr<ImageReader> reader(get_image_reader(curIter_->format(),curIter_->file()));
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std::cout<<reader.get()<<std::endl;
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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,curIter_->envelope());
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Envelope<double> intersect=extent_.intersect(curIter_->envelope());
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Envelope<double> ext=t.forward(intersect);
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Envelope<double> image_ext=t_.forward(intersect);
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ImageData32 image((int)ext.width(),(int)ext.height());
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reader->read((int)ext.minx(),(int)ext.miny(),image);
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ImageData32 target((int)(image_ext.width()+0.5),(int)(image_ext.height()+0.5));
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scale_image<ImageData32>(target,image);
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f=new RasterFeature(++id_,RasterPtr(new raster((int)(image_ext.minx()+0.5),
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(int)(image_ext.miny()+0.5),target)));
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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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}
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++curIter_;
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}
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return f;
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}
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template class RasterFeatureset<single_file_policy>;
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//template RasterFeatureset<os_name_policy>;
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