93 lines
2.8 KiB
C++
93 lines
2.8 KiB
C++
/*****************************************************************************
|
|
*
|
|
* This file is part of Mapnik (c++ mapping toolkit)
|
|
*
|
|
* Copyright (C) 2017 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
|
|
*
|
|
*****************************************************************************/
|
|
|
|
#ifndef GDAL_FEATURESET_HPP
|
|
#define GDAL_FEATURESET_HPP
|
|
|
|
// mapnik
|
|
#include <mapnik/featureset.hpp>
|
|
#include <mapnik/query.hpp>
|
|
#include <mapnik/util/variant.hpp>
|
|
// boost
|
|
#include <boost/optional.hpp>
|
|
|
|
class GDALDataset;
|
|
class GDALRasterBand;
|
|
|
|
using gdal_query = mapnik::util::variant<mapnik::query, mapnik::coord2d>;
|
|
|
|
class gdal_featureset : public mapnik::Featureset
|
|
{
|
|
struct query_dispatch
|
|
{
|
|
query_dispatch( gdal_featureset & featureset)
|
|
: featureset_(featureset) {}
|
|
|
|
mapnik::feature_ptr operator() (mapnik::query const& q) const
|
|
{
|
|
return featureset_.get_feature(q);
|
|
}
|
|
|
|
mapnik::feature_ptr operator() (mapnik::coord2d const& p) const
|
|
{
|
|
return featureset_.get_feature_at_point(p);
|
|
}
|
|
|
|
gdal_featureset & featureset_;
|
|
};
|
|
|
|
public:
|
|
gdal_featureset(GDALDataset& dataset,
|
|
int band,
|
|
gdal_query q,
|
|
mapnik::box2d<double> extent,
|
|
unsigned width,
|
|
unsigned height,
|
|
int nbands,
|
|
double dx,
|
|
double dy,
|
|
boost::optional<double> const& nodata,
|
|
double nodata_tolerance,
|
|
int64_t max_image_area);
|
|
virtual ~gdal_featureset();
|
|
mapnik::feature_ptr next();
|
|
|
|
private:
|
|
mapnik::feature_ptr get_feature(mapnik::query const& q);
|
|
mapnik::feature_ptr get_feature_at_point(mapnik::coord2d const& p);
|
|
GDALDataset & dataset_;
|
|
mapnik::context_ptr ctx_;
|
|
int band_;
|
|
gdal_query gquery_;
|
|
mapnik::box2d<double> raster_extent_;
|
|
unsigned raster_width_;
|
|
unsigned raster_height_;
|
|
double dx_;
|
|
double dy_;
|
|
int nbands_;
|
|
boost::optional<double> nodata_value_;
|
|
double nodata_tolerance_;
|
|
int64_t max_image_area_;
|
|
bool first_;
|
|
};
|
|
|
|
#endif // GDAL_FEATURESET_HPP
|