/usr/include/mapnik/ctrans.hpp is in libmapnik-dev 2.2.0+ds1-6build2.
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) 2011 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_CTRANS_HPP
#define MAPNIK_CTRANS_HPP
// mapnik
#include <mapnik/box2d.hpp>
#include <mapnik/vertex.hpp>
#include <mapnik/proj_transform.hpp>
// stl
#include <algorithm>
namespace mapnik
{
template <typename Transform, typename Geometry>
struct MAPNIK_DECL coord_transform
{
// SFINAE value_type detector
template <typename T>
struct void_type
{
typedef void type;
};
template <typename T, typename D, typename _ = void>
struct select_value_type
{
typedef D type;
};
template <typename T, typename D>
struct select_value_type<T, D, typename void_type<typename T::value_type>::type>
{
typedef typename T::value_type type;
};
typedef std::size_t size_type;
typedef typename select_value_type<Geometry, void>::type value_type;
coord_transform(Transform const& t,
Geometry & geom,
proj_transform const& prj_trans)
: t_(&t),
geom_(geom),
prj_trans_(&prj_trans) {}
explicit coord_transform(Geometry & geom)
: t_(0),
geom_(geom),
prj_trans_(0) {}
void set_proj_trans(proj_transform const& prj_trans)
{
prj_trans_ = &prj_trans;
}
void set_trans(Transform const& t)
{
t_ = &t;
}
unsigned vertex(double *x, double *y) const
{
unsigned command = geom_.vertex(x, y);
if ( command != SEG_END)
{
double z = 0;
if (!prj_trans_->backward(*x, *y, z))
return SEG_END;
}
t_->forward(x, y);
return command;
}
void rewind(unsigned pos) const
{
geom_.rewind(pos);
}
unsigned type() const
{
return static_cast<unsigned>(geom_.type());
}
Geometry const& geom() const
{
return geom_;
}
private:
Transform const* t_;
Geometry & geom_;
proj_transform const* prj_trans_;
};
class CoordTransform
{
private:
int width_;
int height_;
box2d<double> extent_;
double offset_x_;
double offset_y_;
double sx_;
double sy_;
public:
CoordTransform(int width, int height, const box2d<double>& extent,
double offset_x = 0, double offset_y = 0)
: width_(width),
height_(height),
extent_(extent),
offset_x_(offset_x),
offset_y_(offset_y),
sx_(1.0),
sy_(1.0)
{
if (extent_.width() > 0)
sx_ = static_cast<double>(width_) / extent_.width();
if (extent_.height() > 0)
sy_ = static_cast<double>(height_) / extent_.height();
}
inline int width() const
{
return width_;
}
inline int height() const
{
return height_;
}
inline double scale_x() const
{
return sx_;
}
inline double scale_y() const
{
return sy_;
}
inline void forward(double *x, double *y) const
{
*x = (*x - extent_.minx()) * sx_ - offset_x_;
*y = (extent_.maxy() - *y) * sy_ - offset_y_;
}
inline void backward(double *x, double *y) const
{
*x = extent_.minx() + (*x + offset_x_) / sx_;
*y = extent_.maxy() - (*y + offset_y_) / sy_;
}
inline coord2d& forward(coord2d& c) const
{
forward(&c.x, &c.y);
return c;
}
inline coord2d& backward(coord2d& c) const
{
backward(&c.x, &c.y);
return c;
}
inline box2d<double> forward(const box2d<double>& e,
proj_transform const& prj_trans) const
{
double x0 = e.minx();
double y0 = e.miny();
double x1 = e.maxx();
double y1 = e.maxy();
double z = 0.0;
prj_trans.backward(x0, y0, z);
forward(&x0, &y0);
prj_trans.backward(x1, y1, z);
forward(&x1, &y1);
return box2d<double>(x0, y0, x1, y1);
}
inline box2d<double> forward(const box2d<double>& e) const
{
double x0 = e.minx();
double y0 = e.miny();
double x1 = e.maxx();
double y1 = e.maxy();
forward(&x0, &y0);
forward(&x1, &y1);
return box2d<double>(x0, y0, x1, y1);
}
inline box2d<double> backward(const box2d<double>& e,
proj_transform const& prj_trans) const
{
double x0 = e.minx();
double y0 = e.miny();
double x1 = e.maxx();
double y1 = e.maxy();
double z = 0.0;
backward(&x0, &y0);
prj_trans.forward(x0, y0, z);
backward(&x1, &y1);
prj_trans.forward(x1, y1, z);
return box2d<double>(x0, y0, x1, y1);
}
inline box2d<double> backward(const box2d<double>& e) const
{
double x0 = e.minx();
double y0 = e.miny();
double x1 = e.maxx();
double y1 = e.maxy();
backward(&x0, &y0);
backward(&x1, &y1);
return box2d<double>(x0, y0, x1, y1);
}
inline box2d<double> const& extent() const
{
return extent_;
}
};
}
#endif // MAPNIK_CTRANS_HPP
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