itkDistanceMetric.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkDistanceMetric.h,v $
  Language:  C++
  Date:      $Date: 2005/07/26 15:54:54 $
  Version:   $Revision: 1.9 $

  Copyright (c) Insight Software 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 __itkDistanceMetric_h
#define __itkDistanceMetric_h

#include "itkMembershipFunctionBase.h"
#include "itkArray.h"

namespace itk{ 
namespace Statistics{

template< class TVector >
class ITK_EXPORT DistanceMetric : public MembershipFunctionBase< TVector >
{
public:
  typedef DistanceMetric Self;
  typedef MembershipFunctionBase< TVector > Superclass;

  typedef unsigned int  MeasurementVectorSizeType;

  virtual void SetMeasurementVectorSize( MeasurementVectorSizeType );
  itkGetConstMacro( MeasurementVectorSize, MeasurementVectorSizeType ); 
  
  itkTypeMacro(DistanceMetric, MembershipFunctionBase);

  typedef Array< double > OriginType ;

  void SetOrigin(const OriginType& x) ;
  itkGetConstReferenceMacro(Origin, OriginType) ;

  virtual double Evaluate(const TVector &x) const = 0 ;
  
  virtual double Evaluate(const TVector &x1, const TVector &x2) const = 0 ;
  
protected:
  DistanceMetric() { m_MeasurementVectorSize = 0; }
  virtual ~DistanceMetric() {}
  void PrintSelf(std::ostream& os, Indent indent) const;

  OriginType m_Origin ;

private:
  MeasurementVectorSizeType m_MeasurementVectorSize;
  
} ; // end of class

} // end of namespace Statistics 
} // end of namespace itk

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

#endif

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