/*=========================================================================
 *
 *  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
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  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.
 *
 *=========================================================================*/
#ifndef __itkComplexBSplineInterpolateImageFunction_hxx
#define __itkComplexBSplineInterpolateImageFunction_hxx

#include "itkComplexBSplineInterpolateImageFunction.h"

namespace itk
{
/**
 * Constructor
 */
template< typename TImageType, typename TCoordRep, typename TCoefficientType >
ComplexBSplineInterpolateImageFunction< TImageType, TCoordRep, TCoefficientType >
::ComplexBSplineInterpolateImageFunction()
{
  m_RealInterpolator = InterpolatorType::New();
  m_ImaginaryInterpolator = InterpolatorType::New();

  m_RealFilter = RealFilterType::New();
  m_ImaginaryFilter = ImaginaryFilterType::New();

  this->SetSplineOrder(3);
}

/**
 * Standard "PrintSelf" method
 */
template< typename TImageType, typename TCoordRep, typename TCoefficientType >
void ComplexBSplineInterpolateImageFunction< TImageType, TCoordRep, TCoefficientType >
::PrintSelf(std::ostream & os, Indent indent) const
{
  Superclass::PrintSelf(os, indent);
  os << indent << "Spline Order: " << m_SplineOrder << std::endl;
  os << indent << "Real Interpolator: " << m_RealInterpolator << std::endl;
  os << indent << "Imaginary Interpolator: " << m_ImaginaryInterpolator << std::endl;
  os << indent << "Complex to Real Filter: " << m_RealFilter << std::endl;
  os << indent << "Complex to Imaginary Filter: " << m_ImaginaryFilter << std::endl;
}

template< typename TImageType, typename TCoordRep, typename TCoefficientType >
void ComplexBSplineInterpolateImageFunction< TImageType, TCoordRep, TCoefficientType >
::SetInputImage(const TImageType *inputData)
{
  if ( inputData )
    {
    m_RealFilter->SetInput(inputData);
    m_ImaginaryFilter->SetInput(inputData);

    m_RealInterpolator->SetInputImage( m_RealFilter->GetOutput() );
    m_ImaginaryInterpolator->SetInputImage( m_ImaginaryFilter->GetOutput() );

    Superclass::SetInputImage(inputData);
    }
}

template< typename TImageType, typename TCoordRep, typename TCoefficientType >
void ComplexBSplineInterpolateImageFunction< TImageType, TCoordRep, TCoefficientType >
::SetSplineOrder(unsigned int SplineOrder)
{
  m_SplineOrder = SplineOrder;
  m_RealInterpolator->SetSplineOrder(SplineOrder);
  m_ImaginaryInterpolator->SetSplineOrder(SplineOrder);
}

template< typename TImageType, typename TCoordRep, typename TCoefficientType >
typename ComplexBSplineInterpolateImageFunction< TImageType, TCoordRep,
                                                 TCoefficientType >::OutputType ComplexBSplineInterpolateImageFunction<
  TImageType, TCoordRep, TCoefficientType >
::EvaluateAtContinuousIndex(const ContinuousIndexType & x) const
{
  typename InterpolatorType::OutputType realPart =
    m_RealInterpolator->EvaluateAtContinuousIndex(x);
  typename InterpolatorType::OutputType imagPart =
    m_ImaginaryInterpolator->EvaluateAtContinuousIndex(x);
  typedef typename ComplexBSplineInterpolateImageFunction< TImageType, TCoordRep, TCoefficientType >::OutputType
  ReturnType;

  return ReturnType(realPart, imagPart);
}
} // namespace itk

#endif
