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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkCellDerivatives.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#ifndef vtkCellDerivatives_h
#define vtkCellDerivatives_h

#include "vtkFiltersGeneralModule.h" // For export macro
#include "vtkDataSetAlgorithm.h"

#define VTK_VECTOR_MODE_PASS_VECTORS      0
#define VTK_VECTOR_MODE_COMPUTE_GRADIENT  1
#define VTK_VECTOR_MODE_COMPUTE_VORTICITY 2

#define VTK_TENSOR_MODE_PASS_TENSORS     0
#define VTK_TENSOR_MODE_COMPUTE_GRADIENT 1
#define VTK_TENSOR_MODE_COMPUTE_STRAIN   2

class VTKFILTERSGENERAL_EXPORT vtkCellDerivatives : public vtkDataSetAlgorithm
{
public:
  vtkTypeMacro(vtkCellDerivatives,vtkDataSetAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);

  static vtkCellDerivatives *New();


  vtkSetMacro(VectorMode,int);
  vtkGetMacro(VectorMode,int);
  void SetVectorModeToPassVectors()
    {this->SetVectorMode(VTK_VECTOR_MODE_PASS_VECTORS);};
  void SetVectorModeToComputeGradient()
    {this->SetVectorMode(VTK_VECTOR_MODE_COMPUTE_GRADIENT);};
  void SetVectorModeToComputeVorticity()
    {this->SetVectorMode(VTK_VECTOR_MODE_COMPUTE_VORTICITY);};
  const char *GetVectorModeAsString();


  vtkSetMacro(TensorMode,int);
  vtkGetMacro(TensorMode,int);
  void SetTensorModeToPassTensors()
    {this->SetTensorMode(VTK_TENSOR_MODE_PASS_TENSORS);};
  void SetTensorModeToComputeGradient()
    {this->SetTensorMode(VTK_TENSOR_MODE_COMPUTE_GRADIENT);};
  void SetTensorModeToComputeStrain()
    {this->SetTensorMode(VTK_TENSOR_MODE_COMPUTE_STRAIN);};
  const char *GetTensorModeAsString();

protected:
  vtkCellDerivatives();
  ~vtkCellDerivatives() {}
  int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);

  int VectorMode;
  int TensorMode;
private:
  vtkCellDerivatives(const vtkCellDerivatives&);  // Not implemented.
  void operator=(const vtkCellDerivatives&);  // Not implemented.
};

#endif