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/* */
/* Copyright 2009 by Ullrich Koethe */
/* */
/* This file is part of the VIGRA computer vision library. */
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/* http://hci.iwr.uni-heidelberg.de/vigra/ */
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/* ullrich.koethe@iwr.uni-heidelberg.de or */
/* vigra@informatik.uni-hamburg.de */
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/* The above copyright notice and this permission notice shall be */
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/************************************************************************/
#ifndef VIGRA_MESHGRID_HXX
#define VIGRA_MESHGRID_HXX
#include "tinyvector.hxx"
#include "diff2d.hxx"
namespace vigra{
/** \addtogroup RangesAndPoints */
//@{
/********************************************************/
/* */
/* MeshGridAccessor */
/* */
/********************************************************/
/** Accessor for turning iteration over Diff2D into a mesh grid.
The mesh grid concept is adapted from MATLAB. It is a two banded image
(i.e. with 2D vector pixel type) whose first band contains the x-coordinates
of the current pixel, and whose second band contains the y-coordinates.
See \ref meshGrid() for more detailed documentation.
*/
struct MeshGridAccessor
{
/** the value_type of a mesh grid is a 2D vector
*/
typedef TinyVector<Diff2D::MoveX, 2> value_type;
/** read the current data item
*/
template <class ITERATOR>
value_type operator()(ITERATOR const & i) const
{
return value_type(i->x, i->y);
}
/** read the data item at an offset (can be 1D or 2D or higher order difference).
*/
template <class ITERATOR, class DIFFERENCE>
value_type operator()(ITERATOR const & i, DIFFERENCE const & diff) const
{
return value_type(i->x+diff.x, i->y+diff.y);
}
};
/** Create a mesh grid for the specified rectangle.
The mesh grid concept is adapted from MATLAB. It is a two banded image
(i.e. with 2D vector pixel type) whose first band contains the x-coordinates
of the current pixel, and whose second band contains the y-coordinates.
If \a upperLeft is not the point (0,0), the mesh grid is translated relative to
the pixel indices.
<b> Declarations:</b>
\code
triple<Diff2D, Diff2D, MeshGridAccessor>
meshGrid(Diff2D upperLeft, Diff2D lowerRight);
triple<Diff2D, Diff2D, MeshGridAccessor>
meshGrid(Rect2D const & r);
\endcode
<b>Usage:</b>
\code
#include <vigra/meshgrid.hxx>
// create an image whose values are equal to each pixel's distance from the image center
int width = 5, height = 7;
int xc = width/2, yc = height/2; // the image center
FImage dist(width, height);
Point2D upperLeft(-xc, -yc);
using namespace vigra::functor;
transformImage(meshGrid(upperLeft, upperLeft+dist.size()),
destImage(dist),
norm(Arg1()));
\endcode
*/
inline
triple<Diff2D, Diff2D, MeshGridAccessor>
meshGrid(Diff2D upperLeft, Diff2D lowerRight)
{
return triple<Diff2D, Diff2D, MeshGridAccessor>(upperLeft, lowerRight, MeshGridAccessor());
}
inline
triple<Diff2D, Diff2D, MeshGridAccessor>
meshGrid(Rect2D const & r)
{
return triple<Diff2D, Diff2D, MeshGridAccessor>(r.upperLeft(), r.lowerRight(), MeshGridAccessor());
}
}//namespace vigra
//@}
#endif //VIGRA_MESHGRID_HXX
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