itkBSplineInterpolationWeightFunction.h

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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkBSplineInterpolationWeightFunction.h,v $
  Language:  C++
  Date:      $Date: 2008-10-07 12:04:40 $
  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 __itkBSplineInterpolationWeightFunction_h
#define __itkBSplineInterpolationWeightFunction_h

#include "itkFunctionBase.h"
#include "itkContinuousIndex.h"
#include "itkBSplineKernelFunction.h"
#include "itkArray.h"
#include "itkArray2D.h"

namespace itk
{

template <
class TCoordRep = float, 
unsigned int VSpaceDimension = 2,
unsigned int VSplineOrder = 3 
>
class ITK_EXPORT BSplineInterpolationWeightFunction : 
  public FunctionBase< ContinuousIndex<TCoordRep,VSpaceDimension>, 
                       Array<double> > 
{
public:
  typedef BSplineInterpolationWeightFunction Self;
  typedef FunctionBase< ContinuousIndex<TCoordRep,VSpaceDimension>,
            Array<double> >                  Superclass;
  typedef SmartPointer<Self>                 Pointer;
  typedef SmartPointer<const Self>           ConstPointer;

  itkNewMacro( Self );

  itkTypeMacro(BSplineInterpolationWeightFunction, FunctionBase);

  itkStaticConstMacro(SpaceDimension, unsigned int, VSpaceDimension);

  itkStaticConstMacro(SplineOrder, unsigned int, VSplineOrder);

  typedef Array<double> WeightsType;

  typedef Index<VSpaceDimension> IndexType;
  typedef Size<VSpaceDimension>  SizeType;

  typedef ContinuousIndex<TCoordRep,VSpaceDimension> ContinuousIndexType;

  virtual WeightsType Evaluate( const ContinuousIndexType & index ) const;

  virtual void Evaluate( const ContinuousIndexType & index,
    WeightsType & weights, IndexType & startIndex ) const;

  itkGetMacro( SupportSize, SizeType );

  itkGetMacro( NumberOfWeights, unsigned long );

protected:
  BSplineInterpolationWeightFunction();
  ~BSplineInterpolationWeightFunction() {}
  void PrintSelf(std::ostream& os, Indent indent) const;

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

  unsigned long  m_NumberOfWeights; 

  SizeType m_SupportSize;

  typedef Array2D<unsigned long> TableType;

  TableType m_OffsetToIndexTable;

  typedef BSplineKernelFunction<itkGetStaticConstMacro(SplineOrder)> KernelType;

  typename KernelType::Pointer m_Kernel;

};

} // end namespace itk

// Define instantiation macro for this template.
#define ITK_TEMPLATE_BSplineInterpolationWeightFunction(_, EXPORT, x, y) namespace itk { \
  _(3(class EXPORT BSplineInterpolationWeightFunction< ITK_TEMPLATE_3 x >)) \
  namespace Templates { typedef BSplineInterpolationWeightFunction< ITK_TEMPLATE_3 x > BSplineInterpolationWeightFunction##y; } \
  }

#if ITK_TEMPLATE_EXPLICIT
# include "Templates/itkBSplineInterpolationWeightFunction+-.h"
#endif

#if ITK_TEMPLATE_TXX
# include "itkBSplineInterpolationWeightFunction.txx"
#endif


#endif