TrilinearInterpolation.h

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//* This file is part of the MOOSE framework
//* https://mooseframework.inl.gov
//*
//* All rights reserved, see COPYRIGHT for full restrictions
//* https://github.com/idaholab/moose/blob/master/COPYRIGHT
//*
//* Licensed under LGPL 2.1, please see LICENSE for details
//* https://www.gnu.org/licenses/lgpl-2.1.html
 
#pragma once
 
#include <vector>
#include "Moose.h"
 
using libMesh::Real;
 
class TrilinearInterpolation
{
public:
  TrilinearInterpolation(const std::vector<Real> & x,
                         const std::vector<Real> & y,
                         const std::vector<Real> & z,
                         const std::vector<Real> & data);
 
  virtual ~TrilinearInterpolation() = default;
 
  Real sample(Real x, Real y, Real z) const;
 
protected:
  std::vector<Real> _x_axis;
 
  std::vector<Real> _y_axis;
 
  std::vector<Real> _z_axis;
 
  std::vector<Real> _fxyz;
 
  void
  getCornerIndices(const std::vector<Real> & v, Real x, int & lower, int & upper, Real & d) const;
 
  Real getCornerValues(int x, int y, int z) const;
};