/usr/include/dune/grid/albertagrid/transformation.hh is in libdune-grid-dev 2.2.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 | #ifndef DUNE_ALBERTA_TRANSFORMATION_HH
#define DUNE_ALBERTA_TRANSFORMATION_HH
#include <dune/common/fvector.hh>
#include <dune/grid/albertagrid/misc.hh>
#if HAVE_ALBERTA
namespace Dune
{
class AlbertaTransformation
{
typedef Alberta::GlobalSpace GlobalSpace;
public:
typedef Alberta::Real ctype;
static const int dimension = Alberta::dimWorld;
typedef FieldVector< ctype, dimension > WorldVector;
explicit
AlbertaTransformation ( const Alberta::AffineTransformation *trafo = NULL )
: matrix_( (trafo != NULL ? trafo->M : GlobalSpace::identityMatrix()) ),
shift_( (trafo != NULL ? trafo->t : GlobalSpace::nullVector()) )
{}
AlbertaTransformation ( const GlobalSpace::Matrix &matrix,
const GlobalSpace::Vector &shift )
: matrix_( matrix ),
shift_( shift )
{}
WorldVector evaluate ( const WorldVector &x ) const
{
WorldVector y;
for( int i = 0; i < dimension; ++i )
{
const GlobalSpace::Vector &row = matrix_[ i ];
y[ i ] = shift_[ i ];
for( int j = 0; j < dimension; ++j )
y[ i ] += row[ j ] * x[ j ];
}
return y;
}
WorldVector evaluateInverse ( const WorldVector &y ) const
{
// Note: ALBERTA requires the matrix to be orthogonal
WorldVector x( ctype( 0 ) );
for( int i = 0; i < dimension; ++i )
{
const GlobalSpace::Vector &row = matrix_[ i ];
const ctype v = y[ i ] - shift_[ i ];
for( int j = 0; j < dimension; ++j )
x[ j ] += row[ j ] * v;
}
return x;
}
private:
const GlobalSpace::Matrix &matrix_;
const GlobalSpace::Vector &shift_;
};
}
#endif // #if HAVE_ALBERTA
#endif // #ifndef DUNE_ALBERTA_TRANSFORMATION_HH
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