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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
*
*****************************************************************************/
//$Id$
// mapnik
#include <mapnik/proj_transform.hpp>
#include <mapnik/utils.hpp>
// proj4
#include <proj_api.h>
namespace mapnik {
proj_transform::proj_transform(projection const& source,
projection const& dest)
: source_(source),
dest_(dest)
{
is_source_latlong_ = source_.is_geographic();
is_dest_latlong_ = dest_.is_geographic();
is_source_equal_dest_ = (source_ == dest_);
}
bool proj_transform::equal() const
{
return is_source_equal_dest_;
}
bool proj_transform::forward (double & x, double & y , double & z) const
{
if (is_source_equal_dest_)
return true;
if (is_source_latlong_)
{
x *= DEG_TO_RAD;
y *= DEG_TO_RAD;
}
#ifdef MAPNIK_THREADSAFE
mutex::scoped_lock lock(projection::mutex_);
#endif
if (pj_transform( source_.proj_, dest_.proj_, 1,
0, &x,&y,&z) != 0)
{
return false;
}
if (is_dest_latlong_)
{
x *= RAD_TO_DEG;
y *= RAD_TO_DEG;
}
return true;
}
bool proj_transform::backward (double & x, double & y , double & z) const
{
if (is_source_equal_dest_)
return true;
if (is_dest_latlong_)
{
x *= DEG_TO_RAD;
y *= DEG_TO_RAD;
}
#ifdef MAPNIK_THREADSAFE
mutex::scoped_lock lock(projection::mutex_);
#endif
if (pj_transform( dest_.proj_, source_.proj_, 1,
0, &x,&y,&z) != 0)
{
return false;
}
if (is_source_latlong_)
{
x *= RAD_TO_DEG;
y *= RAD_TO_DEG;
}
return true;
}
mapnik::projection const& proj_transform::source() const
{
return source_;
}
mapnik::projection const& proj_transform::dest() const
{
return dest_;
}
}
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