itkCurvatureFlowFunction.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkCurvatureFlowFunction.h,v $
  Language:  C++
  Date:      $Date: 2002/09/28 03:16:55 $
  Version:   $Revision: 1.12 $

  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 __itkCurvatureFlowFunction_h_
#define __itkCurvatureFlowFunction_h_

#include "itkFiniteDifferenceFunction.h"
#include "itkMacro.h"

namespace itk {

template <class TImage>
class CurvatureFlowFunction :
    public FiniteDifferenceFunction<TImage>
{
public:
  typedef CurvatureFlowFunction Self;
  typedef FiniteDifferenceFunction<TImage> Superclass;
  typedef SmartPointer<Self> Pointer;
  typedef SmartPointer<const Self> ConstPointer;

  itkNewMacro(Self);

  itkTypeMacro( CurvatureFlowFunction,
                FiniteDifferenceFunction );
  
  typedef typename Superclass::ImageType  ImageType;
  typedef typename Superclass::PixelType  PixelType;
  typedef typename Superclass::RadiusType RadiusType;
  typedef PixelType  ScalarValueType;
  typedef typename Superclass::NeighborhoodType NeighborhoodType;
  typedef typename Superclass::BoundaryNeighborhoodType BoundaryNeighborhoodType;
  typedef typename Superclass::FloatOffsetType FloatOffsetType;
  typedef typename Superclass::TimeStepType TimeStepType;

  itkStaticConstMacro(ImageDimension, unsigned int,Superclass::ImageDimension);

  virtual TimeStepType ComputeGlobalTimeStep(void *GlobalData) const;

  virtual void *GetGlobalDataPointer() const
    {  
      GlobalDataStruct *ans = new GlobalDataStruct();
      ans->m_MaxChange   = NumericTraits<ScalarValueType>::Zero;
      return ans; 
    }

  virtual void ReleaseGlobalDataPointer(void *GlobalData) const
    { delete (GlobalDataStruct *) GlobalData; }

  void SetTimeStep( const TimeStepType & t )
    { m_TimeStep = t; }

  const TimeStepType &GetTimeStep() const
    { return m_TimeStep; }

  virtual PixelType ComputeUpdate(const NeighborhoodType &neighborhood,
                                  void * globalData,
                                  const FloatOffsetType& offset = m_ZeroOffset
                                  ) const;

  virtual PixelType ComputeUpdate(const BoundaryNeighborhoodType
                                  &neighborhood, void * globalData,
                                  const FloatOffsetType& offset = m_ZeroOffset
                                  ) const;

protected:

  struct GlobalDataStruct
  {
    GlobalDataStruct()
    {
      m_MaxChange = NumericTraits<ScalarValueType>::Zero;
    }
    ~GlobalDataStruct() {}
    
    ScalarValueType m_MaxChange;
  };

  CurvatureFlowFunction();
  ~CurvatureFlowFunction() {}

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

  TimeStepType       m_TimeStep;
  
  
};

}// end namespace itk

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

#endif

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