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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkNarrowBandLevelSetImageFilter.txx,v $
  Language:  C++
  Date:      $Date: 2004/12/21 22:47:27 $
  Version:   $Revision: 1.7 $

  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 __itkNarrowBandLevelSetImageFilter_txx_
#define __itkNarrowBandLevelSetImageFilter_txx_

#include "itkNarrowBandLevelSetImageFilter.h"
#include "stdio.h"

namespace itk {

template <class TInputImage, class TFeatureImage, class TOutputPixelType, class TOutputImage>
void
NarrowBandLevelSetImageFilter<TInputImage, TFeatureImage, TOutputPixelType, TOutputImage>
::PrintSelf(std::ostream &os, Indent indent) const
{
  Superclass::PrintSelf(os, indent);
  os << indent << "m_ReverseExpansionDirection = " << m_ReverseExpansionDirection << std::endl;
  os << indent << "m_SegmentationFunction = " << m_SegmentationFunction << std::endl;
}

template <class TInputImage, class TFeatureImage, class TOutputPixelType, class TOutputImage>
NarrowBandLevelSetImageFilter<TInputImage, TFeatureImage, TOutputPixelType, TOutputImage>
::NarrowBandLevelSetImageFilter()
{
  this->SetNumberOfRequiredInputs(2);
  //this->SetNarrowBandInnerRadius();
  //this->SetNarrowBandTotalRadius();
  m_SegmentationFunction = 0;
  
  m_IsoFilter = IsoFilterType::New();
  m_ChamferFilter = ChamferFilterType::New(); 
  
  // Provide some reasonable defaults which will at least prevent infinite
  // looping.
  this->SetMaximumRMSError(0.02);
  this->SetNumberOfIterations(1000);
  m_ReverseExpansionDirection = false;
}

template <class TInputImage, class TFeatureImage, class TOutputPixelType, class TOutputImage>
void
NarrowBandLevelSetImageFilter<TInputImage, TFeatureImage, TOutputPixelType, TOutputImage>
::SetSegmentationFunction(SegmentationFunctionType *s)
{
  unsigned int i;
  
  m_SegmentationFunction = s; 
  
  typename SegmentationFunctionType::RadiusType r;
  for (i = 0; i < Self::ImageDimension; ++i)  r[i] = 1;
  
  m_SegmentationFunction->Initialize(r);
  this->SetDifferenceFunction(m_SegmentationFunction);
  this->Modified();
}

template <class TInputImage, class TFeatureImage, class TOutputPixelType, class TOutputImage>
void
NarrowBandLevelSetImageFilter<TInputImage, TFeatureImage, TOutputPixelType, TOutputImage>
::GenerateData()
{
  if (m_SegmentationFunction == 0)
    {itkExceptionMacro("No finite difference function was specified.");}  

  // A positive speed value causes surface expansion, the opposite of the
  // default.  Flip the sign of the propagation and advection weights.
  if (m_ReverseExpansionDirection == true)
    {
    this->GetSegmentationFunction()->ReverseExpansionDirection();
    }
  
  // Allocate the images from which speeds will be sampled.
  if (this->GetSegmentationFunction()->GetPropagationWeight() != 0)
    {
    m_SegmentationFunction->AllocateSpeedImage();
    m_SegmentationFunction->CalculateSpeedImage();
    }
  if (this->GetSegmentationFunction()->GetAdvectionWeight() != 0)
    {
    m_SegmentationFunction->AllocateAdvectionImage();
    m_SegmentationFunction->CalculateAdvectionImage();
    }
  
  // Start the solver
  Superclass::GenerateData();
  
  // Reset all the signs of the weights.
  if (m_ReverseExpansionDirection == true)
    {
    this->GetSegmentationFunction()->ReverseExpansionDirection();
    }  
}

template <class TInputImage, class TFeatureImage, class TOutputPixelType, class TOutputImage>
void
NarrowBandLevelSetImageFilter<TInputImage, TFeatureImage, TOutputPixelType, TOutputImage>
::CreateNarrowBand()
{

  typename OutputImageType::Pointer levelset = this->GetOutput();

  if(!this->m_NarrowBand->Empty())
    {
    m_IsoFilter->SetNarrowBand(this->m_NarrowBand.GetPointer());
    m_IsoFilter->NarrowBandingOn(); //Maybe we should check that the NarrowBand exits.
    }
  else
    {
    m_IsoFilter->NarrowBandingOff();
    }  
  
  m_IsoFilter->SetFarValue(this->m_NarrowBand->GetTotalRadius()+1);
  m_IsoFilter->SetInput(levelset);
  m_IsoFilter->Update();
  
  m_ChamferFilter->SetInput(m_IsoFilter->GetOutput());
  m_ChamferFilter->SetMaximumDistance(this->m_NarrowBand->GetTotalRadius()+1);
  m_ChamferFilter->SetNarrowBand(this->m_NarrowBand.GetPointer());
  m_ChamferFilter->Update();
 
  this->GraftOutput(m_ChamferFilter->GetOutput());
  m_IsoFilter->SetInput(NULL);
  m_ChamferFilter->SetInput(NULL);
}

} // end namespace itk

#endif
