75 lines
2.7 KiB
C++
75 lines
2.7 KiB
C++
/*****************************************************************************
|
|
*
|
|
* This file is part of Mapnik (c++ mapping toolkit)
|
|
*
|
|
* Copyright (C) 2006 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/image_reader.hpp>
|
|
#include <mapnik/image_util.hpp>
|
|
|
|
#include "raster_featureset.hpp"
|
|
|
|
template <typename LookupPolicy>
|
|
raster_featureset<LookupPolicy>::raster_featureset(LookupPolicy const& policy,
|
|
query const& q)
|
|
: policy_(policy),
|
|
id_(1),
|
|
extent_(q.get_bbox()),
|
|
curIter_(policy_.query(extent_)),
|
|
endIter_(policy_.end())
|
|
{}
|
|
|
|
template <typename LookupPolicy>
|
|
raster_featureset<LookupPolicy>::~raster_featureset() {}
|
|
|
|
template <typename LookupPolicy>
|
|
feature_ptr raster_featureset<LookupPolicy>::next()
|
|
{
|
|
if (curIter_!=endIter_)
|
|
{
|
|
feature_ptr feature(new Feature(+id_));
|
|
try
|
|
{
|
|
std::auto_ptr<ImageReader> reader(get_image_reader(curIter_->format(),curIter_->file()));
|
|
if (reader.get())
|
|
{
|
|
int image_width=reader->width();
|
|
int image_height=reader->height();
|
|
if (image_width>0 && image_height>0)
|
|
{
|
|
CoordTransform t(image_width,image_height,curIter_->envelope());
|
|
Envelope<double> intersect=extent_.intersect(curIter_->envelope());
|
|
Envelope<double> ext=t.forward(intersect);
|
|
|
|
ImageData32 image((int)ext.width(),(int)ext.height());
|
|
reader->read((int)ext.minx(),(int)ext.miny(),image);
|
|
feature->set_raster(raster_ptr(new raster(intersect,image)));
|
|
}
|
|
}
|
|
}
|
|
catch (...)
|
|
{
|
|
}
|
|
++curIter_;
|
|
return feature;
|
|
}
|
|
return feature_ptr();
|
|
}
|
|
|
|
template class raster_featureset<single_file_policy>;
|