CubicTransition.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 "SmoothTransition.h"

class CubicTransition : public SmoothTransition
{
public:
  CubicTransition(const Real & x_center, const Real & transition_width);

  virtual Real value(const Real & x, const Real & f1, const Real & f2) const override;

  Real derivative(const Real & x, const Real & df1dx, const Real & df2dx) const;

  void initialize(const Real & f1_end_value,
                  const Real & f2_end_value,
                  const Real & df1dx_end_value,
                  const Real & df2dx_end_value);

protected:
  // Polynomial coefficients
  Real _A;
  Real _B;
  Real _C;
  Real _D;

  bool _initialized;
};