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/*****************************************************************************
*
* 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
*
*****************************************************************************/
//$Id: raster_datasource.cc 44 2005-04-22 18:53:54Z pavlenko $
// boost
#include <boost/lexical_cast.hpp>
#include <boost/filesystem/operations.hpp>
#include <boost/make_shared.hpp>
// mapnik
#include <mapnik/image_reader.hpp>
#include "raster_featureset.hpp"
#include "raster_info.hpp"
#include "raster_datasource.hpp"
using mapnik::datasource;
using mapnik::parameters;
using mapnik::image_reader;
DATASOURCE_PLUGIN(raster_datasource)
using boost::lexical_cast;
using boost::bad_lexical_cast;
using mapnik::layer_descriptor;
using mapnik::featureset_ptr;
using mapnik::query;
using mapnik::coord2d;
using mapnik::datasource_exception;
raster_datasource::raster_datasource(const parameters& params, bool bind)
: datasource(params),
desc_(*params.get<std::string>("type"),"utf-8"),
extent_initialized_(false)
{
#ifdef MAPNIK_DEBUG
std::clog << "Raster Plugin: Initializing..." << std::endl;
#endif
boost::optional<std::string> file = params.get<std::string>("file");
if (! file) throw datasource_exception("Raster Plugin: missing <file> parameter ");
boost::optional<std::string> base = params.get<std::string>("base");
if (base)
filename_ = *base + "/" + *file;
else
filename_ = *file;
format_=*params_.get<std::string>("format","tiff");
boost::optional<double> lox = params_.get<double>("lox");
boost::optional<double> loy = params_.get<double>("loy");
boost::optional<double> hix = params_.get<double>("hix");
boost::optional<double> hiy = params_.get<double>("hiy");
boost::optional<std::string> ext = params_.get<std::string>("extent");
if (lox && loy && hix && hiy)
{
extent_.init(*lox, *loy, *hix, *hiy);
extent_initialized_ = true;
}
else if (ext)
{
extent_initialized_ = extent_.from_string(*ext);
}
if (! extent_initialized_)
throw datasource_exception("Raster Plugin: valid <extent> or <lox> <loy> <hix> <hiy> are required");
if (bind)
{
this->bind();
}
}
void raster_datasource::bind() const
{
if (is_bound_) return;
if (! boost::filesystem::exists(filename_))
throw datasource_exception("Raster Plugin: " + filename_ + " does not exist");
try
{
std::auto_ptr<image_reader> reader(mapnik::get_image_reader(filename_, format_));
if (reader.get())
{
width_ = reader->width();
height_ = reader->height();
#ifdef MAPNIK_DEBUG
std::clog << "Raster Plugin: RASTER SIZE(" << width_ << "," << height_ << ")" << std::endl;
#endif
}
}
catch (mapnik::image_reader_exception const& ex)
{
std::cerr << "Raster Plugin: image reader exception caught: " << ex.what() << std::endl;
throw;
}
catch (...)
{
std::cerr << "Raster Plugin: exception caught" << std::endl;
throw;
}
is_bound_ = true;
}
raster_datasource::~raster_datasource()
{
}
int raster_datasource::type() const
{
return datasource::Raster;
}
std::string raster_datasource::name()
{
return "raster";
}
mapnik::box2d<double> raster_datasource::envelope() const
{
return extent_;
}
layer_descriptor raster_datasource::get_descriptor() const
{
return desc_;
}
featureset_ptr raster_datasource::features(query const& q) const
{
if (! is_bound_) bind();
mapnik::CoordTransform t(width_, height_, extent_, 0, 0);
mapnik::box2d<double> intersect = extent_.intersect(q.get_bbox());
mapnik::box2d<double> ext = t.forward(intersect);
const int width = int(ext.maxx() + 0.5) - int(ext.minx() + 0.5);
const int height = int(ext.maxy() + 0.5) - int(ext.miny() + 0.5);
#ifdef MAPNIK_DEBUG
std::clog << "Raster Plugin: BOX SIZE(" << width << " " << height << ")" << std::endl;
#endif
if (width * height > 512*512)
{
#ifdef MAPNIK_DEBUG
std::clog << "Raster Plugin: TILED policy" << std::endl;
#endif
tiled_file_policy policy(filename_, format_, 256, extent_, q.get_bbox(), width_, height_);
return boost::make_shared<raster_featureset<tiled_file_policy> >(policy, extent_, q);
}
else
{
#ifdef MAPNIK_DEBUG
std::clog << "Raster Plugin: SINGLE FILE" << std::endl;
#endif
raster_info info(filename_, format_, extent_, width_, height_);
single_file_policy policy(info);
return boost::make_shared<raster_featureset<single_file_policy> >(policy, extent_, q);
}
}
featureset_ptr raster_datasource::features_at_point(coord2d const&) const
{
std::clog << "Raster Plugin: ##WARNING: feature_at_point not supported for raster.input" << std::endl;
return featureset_ptr();
}
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