/usr/include/dune/grid/test/functions.hh is in libdune-grid-dev 2.3.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_GEOGRID_TEST_FUNCTIONS_HH
#define DUNE_GEOGRID_TEST_FUNCTIONS_HH
#include <dune/grid/geometrygrid/coordfunction.hh>
#include <dune/grid/geometrygrid/identity.hh>
namespace Dune
{
class Helix
: public AnalyticalCoordFunction< double, 2, 3, Helix >
{
typedef Helix This;
typedef AnalyticalCoordFunction< double, 2, 3, This > Base;
public:
typedef Base :: DomainVector DomainVector;
typedef Base :: RangeVector RangeVector;
void evaluate ( const DomainVector &x, RangeVector &y ) const
{
y[ 0 ] = (x[ 0 ] + 0.2) * cos( 2.0 * M_PI * x[ 1 ] );
y[ 1 ] = (x[ 0 ] + 0.2) * sin( 2.0 * M_PI * x[ 1 ] );
y[ 2 ] = x[ 1 ];
}
};
class Circle
: public AnalyticalCoordFunction< double, 2, 2, Circle >
{
typedef Circle This;
typedef AnalyticalCoordFunction< double, 2, 2, This > Base;
public:
typedef Base :: DomainVector DomainVector;
typedef Base :: RangeVector RangeVector;
void evaluate ( const DomainVector &x, RangeVector &y ) const
{
y[ 0 ] = (x[ 0 ] + 0.2) * cos( 2.0 * M_PI * x[ 1 ] );
y[ 1 ] = (x[ 0 ] + 0.2) * sin( 2.0 * M_PI * x[ 1 ] );
}
};
class ThickHelix
: public AnalyticalCoordFunction< double, 3, 3, ThickHelix >
{
typedef ThickHelix This;
typedef AnalyticalCoordFunction< double, 3, 3, This > Base;
public:
typedef Base :: DomainVector DomainVector;
typedef Base :: RangeVector RangeVector;
void evaluate ( const DomainVector &x, RangeVector &y ) const
{
double angle = x[1]-3.;
if (std::abs(angle)<1.) {
y[0] = x[0]+0.2;
y[1] = angle;
y[2] = x[2];
}
else {
double fac = 1.;
if (angle>0) {
y[1] = 1.;
angle -= 1.;
fac=3.;
}
else {
y[1] = -1;
angle += 1.;
fac=5;
}
y[ 0 ] = (x[ 0 ] + 0.2) * cos( 2.0 * M_PI * angle );
y[ 1 ] += (x[ 0 ] + 0.2) * sin( 2.0 * M_PI * angle );
y[ 2 ] = x[ 2 ] + fac*std::abs(angle);
}
}
};
}
#endif
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