f4949ffca5
proj4 library and ensure that only one thread can be inside a call to the library at a time.
93 lines
2.6 KiB
C++
93 lines
2.6 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2006 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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//$Id$
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// mapnik
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#include <mapnik/proj_transform.hpp>
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#include <mapnik/utils.hpp>
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// proj4
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#include <proj_api.h>
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namespace mapnik {
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proj_transform::proj_transform(projection const& source,
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projection const& dest)
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: source_(source),
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dest_(dest)
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{
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mutex::scoped_lock lock(projection::mutex_);
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is_source_latlong_ = pj_is_latlong(source_.proj_);
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is_dest_latlong_ = pj_is_latlong(dest_.proj_);
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}
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bool proj_transform::forward (double & x, double & y , double & z) const
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{
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mutex::scoped_lock lock(projection::mutex_);
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if (is_source_latlong_)
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{
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x *= DEG_TO_RAD;
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y *= DEG_TO_RAD;
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}
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if (pj_transform( source_.proj_, dest_.proj_, 1,
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0, &x,&y,&z) != 0)
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{
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return false;
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}
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if (is_dest_latlong_)
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{
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x *= RAD_TO_DEG;
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y *= RAD_TO_DEG;
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}
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return true;
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}
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bool proj_transform::backward (double & x, double & y , double & z) const
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{
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mutex::scoped_lock lock(projection::mutex_);
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if (is_dest_latlong_)
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{
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x *= DEG_TO_RAD;
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y *= DEG_TO_RAD;
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}
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if (pj_transform( dest_.proj_, source_.proj_, 1,
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0, &x,&y,&z) != 0)
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{
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return false;
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}
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if (is_source_latlong_)
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{
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x *= RAD_TO_DEG;
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y *= RAD_TO_DEG;
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}
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return true;
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}
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}
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