/usr/include/dune/localfunctions/raviartthomas/raviartthomas02d/raviartthomas02dlocalinterpolation.hh is in libdune-localfunctions-dev 2.5.0-2.
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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 | // -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_RT02DLOCALINTERPOLATION_HH
#define DUNE_RT02DLOCALINTERPOLATION_HH
#include <cmath>
#include <vector>
#include <dune/common/exceptions.hh>
namespace Dune
{
template<class LB>
class RT02DLocalInterpolation
{
public:
//! \brief Standard constructor
RT02DLocalInterpolation ()
{
sign0 = sign1 = sign2 = 1.0;
}
//! \brief Make set numer s, where 0<=s<8
RT02DLocalInterpolation (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;
m0[0] = 0.5; m0[1] = 0.0;
m1[0] = 0.0; m1[1] = 0.5;
m2[0] = 0.5; m2[1] = 0.5;
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]);
}
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!
typename F::Traits::RangeType y;
out.resize(3);
f.evaluate(m0,y); out[0] = (y[0]*n0[0]+y[1]*n0[1])*sign0/c0;
f.evaluate(m1,y); out[1] = (y[0]*n1[0]+y[1]*n1[1])*sign1/c1;
f.evaluate(m2,y); out[2] = (y[0]*n2[0]+y[1]*n2[1])*sign2/c2;
}
private:
typename LB::Traits::RangeFieldType sign0,sign1,sign2;
typename LB::Traits::DomainType m0,m1,m2;
typename LB::Traits::DomainType n0,n1,n2;
typename LB::Traits::RangeFieldType c0,c1,c2;
};
}
#endif
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