itkSymmetricEigenSystem.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkSymmetricEigenSystem.h,v $
  Language:  C++
  Date:      $Date: 2002/09/21 19:08:26 $
  Version:   $Revision: 1.3 $

  Copyright (c) 2002 Insight Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/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 notices for more information.

=========================================================================*/
#ifndef __itkSymmetricEigenSystem_h
#define __itkSymmetricEigenSystem_h

#include "vnl/algo/vnl_symmetric_eigensystem.h"
#include "itkFixedArray.h"
#include "itkMatrix.h"

namespace itk
{
  
template< class TMatrixElement, int VNumberOfRows >
class ITK_EXPORT SymmetricEigenSystem : public Object
{
public:
  typedef SymmetricEigenSystem Self;
  typedef Object Superclass;
  typedef SmartPointer<Self> Pointer;
  typedef SmartPointer<const Self> ConstPointer;
  
  itkTypeMacro( SymmetricEigenSystem, Object );

  itkNewMacro(Self);

  typedef FixedArray< TMatrixElement, VNumberOfRows > ArrayType;

  typedef FixedArray< ArrayType, VNumberOfRows > Array2DType ;

  typedef Array2DType EigenVectorArrayType ;

  typedef ArrayType EigenValueArrayType ;

  typedef Matrix< TMatrixElement, VNumberOfRows, VNumberOfRows > MatrixType ;

  typedef vnl_symmetric_eigensystem< TMatrixElement > InternalEigenSystemType;

  itkSetObjectMacro(Matrix, MatrixType) ;
  MatrixType* GetMatrix()
  { return m_Matrix ; }

  itkSetMacro(UseAbsoluteOrder, bool) ;
  itkGetMacro(UseAbsoluteOrder, bool) ;

  EigenVectorArrayType* GetEigenVectors()
  { return &m_EigenVectors ; } 

  EigenValueArrayType* GetEigenValues()
  { return &m_EigenValues ; }

  void Update()
  { this->GenerateData() ; }

protected:
  SymmetricEigenSystem();
  virtual ~SymmetricEigenSystem();
  void PrintSelf(std::ostream& os, Indent indent) const;

  void GenerateData() ;

private:
  SymmetricEigenSystem(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented

  MatrixType* m_Matrix ;

  EigenVectorArrayType m_EigenVectors ;
  
  EigenValueArrayType m_EigenValues ;

  bool m_UseAbsoluteOrder ;
};

} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkSymmetricEigenSystem.txx"
#endif

#endif

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