/usr/include/dune/localfunctions/brezzidouglasmarini/brezzidouglasmarini1simplex2d/brezzidouglasmarini1simplex2dlocalinterpolation.hh is in libdune-localfunctions-dev 2.3.1-1.
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#ifndef DUNE_LOCALFUNCTIONS_BREZZIDOUGLASMARINI1_SIMPLEX2D_LOCALINTERPOLATION_HH
#define DUNE_LOCALFUNCTIONS_BREZZIDOUGLASMARINI1_SIMPLEX2D_LOCALINTERPOLATION_HH
#include <vector>
#include <dune/geometry/quadraturerules.hh>
namespace Dune
{
/**
* \ingroup LocalInterpolationImplementation
* \brief First order Brezzi-Douglas-Marini shape functions on the reference triangle.
*
* \tparam LB corresponding LocalBasis giving traits
*
* \nosubgrouping
*/
template<class LB>
class BDM1Simplex2DLocalInterpolation
{
public:
//! \brief Standard constructor
BDM1Simplex2DLocalInterpolation ()
{
sign0 = sign1 = sign2 = 1.0;
}
/**
* \brief Make set number s, where 0 <= s < 8
*
* \param s Edge orientation indicator
*/
BDM1Simplex2DLocalInterpolation (unsigned int s)
{
sign0 = sign1 = sign2 = 1.0;
if (s & 1)
{
sign0 = -1.0;
}
if (s & 2)
{
sign1 = -1.0;
}
if (s & 4)
{
sign2 = -1.0;
}
n0[0] = 0.0;
n0[1] = -1.0;
n1[0] = -1.0;
n1[1] = 0.0;
n2[0] = 1.0/sqrt(2.0);
n2[1] = 1.0/sqrt(2.0);
c0 = 0.5*n0[0] - 1.0*n0[1];
c1 = -1.0*n1[0] + 0.5*n1[1];
c2 = 0.5*n2[0] + 0.5*n2[1];
}
/**
* \brief Interpolate a given function with shape functions
*
* \tparam F Function type for function which should be interpolated
* \tparam C Coefficient type
* \param f function which should be interpolated
* \param out return value, vector of coefficients
*/
template<typename F, typename C>
void interpolate (const F& f, std::vector<C>& out) const
{
// f gives v*outer normal at a point on the edge!
typedef typename LB::Traits::RangeFieldType Scalar;
typename F::Traits::RangeType y;
out.resize(6);
fill(out.begin(), out.end(), 0.0);
const int qOrder = 4;
const Dune::QuadratureRule<Scalar,1>& rule = Dune::QuadratureRules<Scalar,1>::rule(Dune::GeometryType(Dune::GeometryType::simplex,1), qOrder);
for (typename Dune::QuadratureRule<Scalar,1>::const_iterator it=rule.begin(); it!=rule.end(); ++it)
{
Scalar qPos = it->position();
typename LB::Traits::DomainType localPos;
localPos[0] = qPos;
localPos[1] = 0.0;
f.evaluate(localPos, y);
out[0] += (y[0]*n0[0] + y[1]*n0[1])*it->weight()*sign0/c0;
out[3] += (y[0]*n0[0] + y[1]*n0[1])*(2.0*qPos - 1.0)*it->weight()/c0;
localPos[0] = 0.0;
localPos[1] = qPos;
f.evaluate(localPos, y);
out[1] += (y[0]*n1[0] + y[1]*n1[1])*it->weight()*sign1/c1;
out[4] += (y[0]*n1[0] + y[1]*n1[1])*(1.0 - 2.0*qPos)*it->weight()/c1;
localPos[0] = 1.0 - qPos;
localPos[1] = qPos;
f.evaluate(localPos, y);
out[2] += (y[0]*n2[0] + y[1]*n2[1])*it->weight()*sign2/c2;
out[5] += (y[0]*n2[0] + y[1]*n2[1])*(2.0*qPos - 1.0)*it->weight()/c2;
}
}
private:
typename LB::Traits::RangeFieldType sign0,sign1,sign2;
typename LB::Traits::DomainType n0,n1,n2;
typename LB::Traits::RangeFieldType c0,c1,c2;
};
}
#endif // DUNE_LOCALFUNCTIONS_BREZZIDOUGLASMARINI1_SIMPLEX2D_LOCALINTERPOLATION_HH
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