/usr/include/mapnik/proj_strategy.hpp is in libmapnik-dev 3.0.9+ds-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2015 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 MAPNIK_PROJ_STRATEGY_HPP
#define MAPNIK_PROJ_STRATEGY_HPP
// mapnik
#include <mapnik/config.hpp>
#include <mapnik/util/noncopyable.hpp>
#include <mapnik/proj_transform.hpp>
#pragma GCC diagnostic push
#include <mapnik/warning_ignore.hpp>
#include <boost/geometry/core/coordinate_type.hpp>
#include <boost/geometry/core/access.hpp>
#include <boost/numeric/conversion/cast.hpp>
#pragma GCC diagnostic pop
namespace mapnik {
namespace geometry {
template <typename T> struct point;
template <typename T> struct line_string;
}
class projection;
template <typename T> class box2d;
struct proj_strategy
{
proj_strategy(proj_transform const& prj_trans)
: prj_trans_(prj_trans) {}
template <typename P1, typename P2>
inline bool apply(P1 const& p1, P2 & p2) const
{
using p2_type = typename boost::geometry::coordinate_type<P2>::type;
double x = boost::geometry::get<0>(p1);
double y = boost::geometry::get<1>(p1);
double z = 0.0;
if (!prj_trans_.forward(x, y, z)) return false;
boost::geometry::set<0>(p2, static_cast<p2_type>(x));
boost::geometry::set<1>(p2, static_cast<p2_type>(y));
return true;
}
template <typename P1, typename P2>
inline P2 execute(P1 const& p1, bool & status) const
{
P2 p2;
status = apply(p1, p2);
return p2;
}
proj_transform const& prj_trans_;
};
struct proj_backward_strategy
{
proj_backward_strategy(proj_transform const& prj_trans)
: prj_trans_(prj_trans) {}
template <typename P1, typename P2>
inline bool apply(P1 const& p1, P2 & p2) const
{
using p2_type = typename boost::geometry::coordinate_type<P2>::type;
double x = boost::geometry::get<0>(p1);
double y = boost::geometry::get<1>(p1);
double z = 0.0;
if (!prj_trans_.backward(x, y, z)) return false;
boost::geometry::set<0>(p2, static_cast<p2_type>(x));
boost::geometry::set<1>(p2, static_cast<p2_type>(y));
return true;
}
template <typename P1, typename P2>
inline P2 execute(P1 const& p1, bool & status) const
{
P2 p2;
status = apply(p1, p2);
return p2;
}
proj_transform const& prj_trans_;
};
}
#endif // MAPNIK_PROJ_STRATEGY_HPP
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