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/////////////////////////////////////////////////////////////
// //
// Copyright (c) 2003-2014 by The University of Queensland //
// Centre for Geoscience Computing //
// http://earth.uq.edu.au/centre-geoscience-computing //
// //
// Primary Business: Brisbane, Queensland, Australia //
// Licensed under the Open Software License version 3.0 //
// http://www.apache.org/licenses/LICENSE-2.0 //
// //
/////////////////////////////////////////////////////////////
#ifndef ESYS_LSMGAUSSIANGRIDDER_H
#define ESYS_LSMGAUSSIANGRIDDER_H
#include "Foundation/vec3.h"
#include <math.h>
namespace esys
{
namespace lsm
{
class GaussianGridder
{
public:
GaussianGridder(double stdDeviation)
: m_stdDeviation(stdDeviation)
{
}
static const double SQRT_2PI;
double getWeight(const Vec3 ®Pos, const Vec3 &irrPos) const
{
return exp( - ((irrPos-regPos).norm2())/(2.0*m_stdDeviation*m_stdDeviation))/(SQRT_2PI*m_stdDeviation);
}
template <typename TmplCartesianGrid>
void transform(const TmplCartesianGrid &irregular, TmplCartesianGrid ®ular) const
{
typename TmplCartesianGrid::CellIterator regIt = regular.getCellIterator();
const double radius = 3.99*m_stdDeviation;
while (regIt.hasNext())
{
const typename TmplCartesianGrid::Cell ®Cell = regIt.next();
typename TmplCartesianGrid::CellConstIterator irrIt = irregular.getCellIterator(regCell.getPos(), radius);
typename TmplCartesianGrid::value_type value;
value *= 0.0;
double weightSum = 0.0;
while (irrIt.hasNext())
{
typename TmplCartesianGrid::Cell::ConstIterator pairIt = irrIt.next().getIterator();
while (pairIt.hasNext())
{
const typename TmplCartesianGrid::Cell::PosValuePair &pair = pairIt.next();
const double weight = getWeight(regCell.getPos(), pair.getPos());
weightSum += weight;
value += (pair.getValue()*weight);
}
}
if (weightSum != 0) {
value /= weightSum;
}
regular.insert(regCell.getPos(), value);
}
}
private:
double m_stdDeviation;
};
}
}
#endif
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