itkRadialBasisFunctionBase.h

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 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
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 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
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 *=========================================================================*/
#ifndef __itkRadialBasisFunctionBase_h
#define __itkRadialBasisFunctionBase_h

#include "itkFunctionBase.h"
#include "itkArray.h"

namespace itk
{
namespace Statistics
{
template<typename ScalarType>
class RadialBasisFunctionBase : public FunctionBase<ScalarType,ScalarType>
{
public:

  typedef RadialBasisFunctionBase             Self;
  typedef FunctionBase<ScalarType,ScalarType> Superclass;
  typedef SmartPointer<Self>                  Pointer;
  typedef SmartPointer<const Self>            ConstPointer;

  itkTypeMacro(RadialBasisFunctionBase, FunctionBase);

  typedef Array<ScalarType> ArrayType;

  virtual ScalarType Evaluate(const ScalarType& input) const=0;

  virtual ScalarType EvaluateDerivative(const ScalarType& dist, const ArrayType& input,
                                                    char mode,int element_id=0) const=0;

  itkSetMacro(Radius,ScalarType);
  itkGetConstMacro(Radius, ScalarType );

  itkSetMacro(Center,ArrayType);
  itkGetConstMacro(Center, ArrayType );

protected:

  RadialBasisFunctionBase()
    {
    m_Radius = 0;
    }
  ~RadialBasisFunctionBase() {};

  virtual void PrintSelf( std::ostream& os, Indent indent ) const
    {
    os << indent << "RadialBasisFunctionBase(" << this << ")" << std::endl;
    Superclass::PrintSelf( os, indent );
    }

private:

  ArrayType  m_Center;
  ScalarType m_Radius;

  RadialBasisFunctionBase(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented
};

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

#endif