BilinearInterpolation.h

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//* This file is part of the MOOSE framework
//* https://www.mooseframework.org
//*
//* 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
 
// MOOSE includes
#include "ColumnMajorMatrix.h"
 
// C++ includes
#include <vector>
 
class BilinearInterpolation
{
public:
  BilinearInterpolation(const std::vector<Real> & XAXIS,
                        const std::vector<Real> & YAXIS,
                        const ColumnMajorMatrix & ZSURFACE);
 
  virtual ~BilinearInterpolation() = default;
 
  Real sample(Real xcoord, Real ycoord);
 
  void getNeighborIndices(const std::vector<Real> & inArr, Real x, int & lowerX, int & upperX);
 
private:
  std::vector<Real> _xAxis;
  std::vector<Real> _yAxis;
  ColumnMajorMatrix _zSurface;
  static int _file_number;
};