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

  Program:   Visualization Toolkit
  Module:    vtkArrayNorm.h
  
-------------------------------------------------------------------------
  Copyright 2008 Sandia Corporation.
  Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
  the U.S. Government retains certain rights in this software.
-------------------------------------------------------------------------

  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.

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

// .NAME vtkArrayNorm - Computes L-norms along one dimension of an array.
//
// .SECTION Description
// Given an input matrix (vtkTypedArray<double>), computes the L-norm for each
// vector along either dimension, storing the results in a dense output
// vector (1D vtkDenseArray<double>).  The caller may optionally request the
// inverse norm as output (useful for subsequent normalization), and may limit
// the computation to a "window" of vector elements, to avoid data copying.
//
// .SECTION Thanks
// Developed by Timothy M. Shead (tshead@sandia.gov) at Sandia National Laboratories.

#ifndef __vtkArrayNorm_h
#define __vtkArrayNorm_h

#include <vtkArrayDataAlgorithm.h>
#include <vtkArrayRange.h>

class VTK_INFOVIS_EXPORT vtkArrayNorm : public vtkArrayDataAlgorithm
{
public:
  static vtkArrayNorm* New();
  vtkTypeMacro(vtkArrayNorm, vtkArrayDataAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Controls the dimension along which norms will be computed.  For input matrices,
  // For input matrices, use "0" (rows) or "1" (columns). Default: 0
  vtkGetMacro(Dimension, int);
  vtkSetMacro(Dimension, int);

  // Description:
  // Controls the L-value.  Default: 2
  vtkGetMacro(L, int);
  void SetL(int value);

  // Description:
  // Controls whether to invert output values.  Default: false
  vtkSetMacro(Invert, int);
  vtkGetMacro(Invert, int);

//BTX
  // Description:
  // Defines an optional "window" used to compute the norm on a subset of the elements
  // in a vector.
  void SetWindow(const vtkArrayRange& window);
  vtkArrayRange GetWindow();

protected:
  vtkArrayNorm();
  ~vtkArrayNorm();

  int RequestData(
    vtkInformation*, 
    vtkInformationVector**, 
    vtkInformationVector*);

private:
  vtkArrayNorm(const vtkArrayNorm&); // Not implemented
  void operator=(const vtkArrayNorm&);   // Not implemented

  int Dimension;
  int L;
  int Invert;
  vtkArrayRange Window;
//ETX
};

#endif