freVectorToNormAccessor.h

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

  Program:   F.R.E.E. - flexible registration evaluation engine
  Version:   v.1.0.0
  Date:      $Date: 2006/09/01 12:00:00 $
  Module:    $RCSfile: freVectorToNormAccessor.h,v $
  Language:  C++



  Copyright (c) 2007 Ralf o Floca (Department of Medical Informatics,
  Institute for Medical Biometry and Informatics, University of Heidelberg,
  Germany). All rights reserved.
  See FREECopyright.txt or http://www.mi.med.uni-hd.de/free/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 _freVectorToNormAccessor_h
#define _freVectorToNormAccessor_h

#include "itkVector.h"

namespace FREE
{
namespace Accessor
{

template <class TVector>
class ITK_EXPORT VectorToNormAccessor
{
public:
  typedef VectorToNormAccessor   Self;

  typedef TVector       InternalType;

        typedef typename InternalType::ValueType        ExternalType;
        
  inline void Set( InternalType & output, const ExternalType & input ) const
  { 
                output = input*m_NormVector;
  }

  inline ExternalType Get( const InternalType & input ) const
  {
    if (!m_NormVectorNorm) return input.GetNorm();

                /*Calculate projection of the given vector along the norm vector.*/
                ExternalType norm = input*m_NormVector;
    return norm;
  }

        inline void SetNormVector(const InternalType& normVector)
        {
                m_NormVector = normVector;
    m_NormVectorNorm = normVector.GetNorm();
                if (m_NormVectorNorm)   m_NormVector.Normalize();
        };

        inline InternalType GetNormVector() const
        {
                return m_NormVector;
        };

        VectorToNormAccessor();
        ~VectorToNormAccessor();

private:
  InternalType m_NormVector;
  ExternalType m_NormVectorNorm;
};

} // namespace Accessor
} // namespace free

#endif

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