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#ifndef __vtkVisItPolyDataNormals2D_h
#define __vtkVisItPolyDataNormals2D_h

#include <visit_vtk_exports.h>
#include <vtkPolyDataAlgorithm.h>

class vtkPolyData;
class vtkInformation;
class vtkInformationVector;

// ****************************************************************************
//  Class:  vtkVisItPolyDataNormals2D
//
//  Purpose:
//    Calculate cell or point centered normals.
//
//  Note: Derived from avtSurfaceNormalExpression version of function
//
//  Programmer:  Jeremy Meredith
//  Creation:    March 10, 2014
//
// ****************************************************************************
class VISIT_VTK_API vtkVisItPolyDataNormals2D : public vtkPolyDataAlgorithm
{
  public:
    vtkTypeMacro(vtkVisItPolyDataNormals2D,vtkPolyDataAlgorithm);

    static vtkVisItPolyDataNormals2D *New();

    void SetNormalTypeToCell()      { ComputePointNormals = false; }
    void SetNormalTypeToPoint()     { ComputePointNormals = true;  }

  protected:
    vtkVisItPolyDataNormals2D();
    ~vtkVisItPolyDataNormals2D() {};

    // Usual data generation method
    int RequestData(vtkInformation*, vtkInformationVector**,
                     vtkInformationVector*);
    void ExecutePoint(vtkPolyData*, vtkPolyData*);
    void ExecuteCell(vtkPolyData *, vtkPolyData*);

    bool  ComputePointNormals;

  private:
    vtkVisItPolyDataNormals2D(const vtkVisItPolyDataNormals2D&);  // Not implemented.
    void operator=(const vtkVisItPolyDataNormals2D&);  // Not implemented.
};

#endif