vtkRungeKutta45.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#ifndef vtkRungeKutta45_h
#define vtkRungeKutta45_h
 
#include "vtkCommonMathModule.h" // For export macro
#include "vtkInitialValueProblemSolver.h"
 
VTK_ABI_NAMESPACE_BEGIN
class VTKCOMMONMATH_EXPORT vtkRungeKutta45 : public vtkInitialValueProblemSolver
{
public:
  vtkTypeMacro(vtkRungeKutta45, vtkInitialValueProblemSolver);
  void PrintSelf(ostream& os, vtkIndent indent) override;
 
  static vtkRungeKutta45* New();
 
  using Superclass::ComputeNextStep;
 
  int ComputeNextStep(double* xprev, double* xnext, double t, double& delT, double maxError,
    double& error, void* userData) override
  {
    double minStep = delT;
    double maxStep = delT;
    double delTActual;
    return this->ComputeNextStep(
      xprev, nullptr, xnext, t, delT, delTActual, minStep, maxStep, maxError, error, userData);
  }
  int ComputeNextStep(double* xprev, double* dxprev, double* xnext, double t, double& delT,
    double maxError, double& error, void* userData) override
  {
    double minStep = delT;
    double maxStep = delT;
    double delTActual;
    return this->ComputeNextStep(
      xprev, dxprev, xnext, t, delT, delTActual, minStep, maxStep, maxError, error, userData);
  }
  int ComputeNextStep(double* xprev, double* xnext, double t, double& delT, double& delTActual,
    double minStep, double maxStep, double maxError, double& error, void* userData) override
  {
    return this->ComputeNextStep(
      xprev, nullptr, xnext, t, delT, delTActual, minStep, maxStep, maxError, error, userData);
  }
  int ComputeNextStep(double* xprev, double* dxprev, double* xnext, double t, double& delT,
    double& delTActual, double minStep, double maxStep, double maxError, double& estErr,
    void* userData) override;
 
protected:
  vtkRungeKutta45();
  ~vtkRungeKutta45() override;
 
  void Initialize() override;
 
  // Cash-Karp parameters
  static double A[5];
  static double B[5][5];
  static double C[6];
  static double DC[6];
 
  double* NextDerivs[6];
 
  int ComputeAStep(double* xprev, double* dxprev, double* xnext, double t, double& delT,
    double& delTActual, double& error, void* userData);
 
private:
  vtkRungeKutta45(const vtkRungeKutta45&) = delete;
  void operator=(const vtkRungeKutta45&) = delete;
};
 
VTK_ABI_NAMESPACE_END
#endif