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

  Program:   Visualization Toolkit
  Module:    vtkVectorNorm.h
  Language:  C++
  Date:      $Date$
  Version:   $Revision$


Copyright (c) 1993-2000 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

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 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

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 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

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=========================================================================*/
// .NAME vtkVectorNorm - generate scalars from Euclidean norm of vectors
// .SECTION Description
// vtkVectorNorm is a filter that generates scalar values by computing
// Euclidean norm of vector triplets. Scalars can be normalized 
// 0<=s<=1 if desired.
//
// Note that this filter operates on point or cell attribute data, or
// both.  By default, the filter operates on both point and cell data
// if vector point and cell data, respectively, are available from the
// input. Alternatively, you can choose to generate scalar norm values
// for just cell or point data.

#ifndef __vtkVectorNorm_h
#define __vtkVectorNorm_h

#define VTK_ATTRIBUTE_MODE_DEFAULT 0
#define VTK_ATTRIBUTE_MODE_USE_POINT_DATA 1
#define VTK_ATTRIBUTE_MODE_USE_CELL_DATA 2

#include "vtkDataSetToDataSetFilter.h"

class VTK_EXPORT vtkVectorNorm : public vtkDataSetToDataSetFilter 
{
public:
  vtkTypeMacro(vtkVectorNorm,vtkDataSetToDataSetFilter);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Construct with normalize flag off.
  static vtkVectorNorm *New();

  // Description:
  // Specify whether to normalize scalar values.
  vtkSetMacro(Normalize,int);
  vtkGetMacro(Normalize,int);
  vtkBooleanMacro(Normalize,int);

  // Description:
  // Control how the filter works to generate scalar data from the
  // input vector data. By default, (AttributeModeToDefault) the
  // filter will generate the scalar norm for point and cell data (if
  // vector data present in the input). Alternatively, you can
  // explicitly set the filter to generate point data
  // (AttributeModeToUsePointData) or cell data
  // (AttributeModeToUseCellData).
  vtkSetMacro(AttributeMode,int);
  vtkGetMacro(AttributeMode,int);
  void SetAttributeModeToDefault() 
    {this->SetAttributeMode(VTK_ATTRIBUTE_MODE_DEFAULT);};
  void SetAttributeModeToUsePointData() 
    {this->SetAttributeMode(VTK_ATTRIBUTE_MODE_USE_POINT_DATA);};
  void SetAttributeModeToUseCellData() 
    {this->SetAttributeMode(VTK_ATTRIBUTE_MODE_USE_CELL_DATA);};
  char *GetAttributeModeAsString();

protected:
  vtkVectorNorm();
  ~vtkVectorNorm() {};
  vtkVectorNorm(const vtkVectorNorm&) {};
  void operator=(const vtkVectorNorm&) {};

  void Execute();

  int Normalize;  // normalize 0<=n<=1 if true.
  int AttributeMode; //control whether to use point or cell data, or both
};

#endif


