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

  Program:   Insight Segmentation & Registration Toolkit
  Module:    ResampleImageFilter8.cxx
  Language:  C++
  Date:      $Date$
  Version:   $Revision$

  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.

=========================================================================*/
#if defined(_MSC_VER)
#pragma warning ( disable : 4786 )
#endif

#ifdef __BORLANDC__
#define ITK_LEAN_AND_MEAN
#endif

//  Software Guide : BeginLatex
//
//  The following example illustrates how to use the
//  \doxygen{WindowedSincInterpolateImageFunction} for resampling an image.
//  This interpolator is in theory the best possible interpolator for
//  reconstructing the continous values of a discrete image. In the spectral
//  domain, this interpolator is performing the task of masking the central
//  part of the spectrum of the sampled image, that in principle corresponds to
//  the spectrumn of the continuous image before it was sampled into a discrete
//  one. In this particular case an \doxygen{AffineTransform} is used to map
//  the input space into the output space.
//
//  \index{itk::AffineTransform!resampling}
//
//  Software Guide : EndLatex 


#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkResampleImageFilter.h"
#include "itkWindowedSincInterpolateImageFunction.h"


//  Software Guide : BeginLatex
//
//  The header of the affine transform is included below.
//
//  Software Guide : EndLatex 

// Software Guide : BeginCodeSnippet
#include "itkAffineTransform.h"
// Software Guide : EndCodeSnippet


int main( int argc, char * argv[] )
{
  if( argc < 4 )
    {
    std::cerr << "Usage: " << std::endl;
    std::cerr << argv[0] << "  inputImageFile  outputImageFile  degrees" << std::endl; 
    return EXIT_FAILURE;
    }

  const     unsigned int   Dimension = 2;
  typedef   unsigned char  InputPixelType;
  typedef   unsigned char  OutputPixelType;

  typedef itk::Image< InputPixelType,  Dimension >   InputImageType;
  typedef itk::Image< OutputPixelType, Dimension >   OutputImageType;

  typedef itk::ImageFileReader< InputImageType  >  ReaderType;
  typedef itk::ImageFileWriter< OutputImageType >  WriterType;

  ReaderType::Pointer reader = ReaderType::New();
  WriterType::Pointer writer = WriterType::New();

  reader->SetFileName( argv[1] );
  writer->SetFileName( argv[2] );

  const double angleInDegrees = atof( argv[3] );
 
  //  Software Guide : BeginLatex
  //
  //  The Resampling filter is instantiated and created just like in previous examples.
  //  The Transform is instantiated and connected to the resampling filter.
  //
  //  Software Guide : EndLatex 

  // Software Guide : BeginCodeSnippet
  typedef itk::ResampleImageFilter<
                  InputImageType, OutputImageType >  FilterType;

  FilterType::Pointer filter = FilterType::New();

  typedef itk::AffineTransform< double, Dimension >  TransformType;

  TransformType::Pointer transform = TransformType::New();

  filter->SetTransform( transform );
  // Software Guide : EndCodeSnippet
 
  //  Software Guide : BeginLatex
  //
  //  The salient feature of this example is the use of the
  //  \doxygen{WindowedSincInterpolateImageFunction}, which uses a truncated
  //  \emph{sinc} function in order to interpolate the resampled image.
  //
  //  There is a close relationship between operations performed in the spatial
  //  domain and those applied in the spectral doman. For example, the action
  //  of truncating the \emph{sinc} function with a box function in the spatial
  //  domain will correspond to convolving its spectrum with the spectrum of a
  //  box function. Since the box function spectrum has an infinite support on
  //  the spectral domain, the result of the convolution will also have an
  //  infinite support on the spectral domain. Due to this effects, it is
  //  desirable to truncate the \emph{sinc} function by using a window that has
  //  a limited spectral support. Many different windows have been developed to
  //  this end in the domain of image processing. Among the most commonly used
  //  we have the \textbf{Hamming} window. We use here a Hamming window in
  //  order to define the truncation of the sinc function. The window is
  //  instantiated and its type is used in the instantiation of the
  //  WindowedSinc interpolator. The size of the window is one of the critical
  //  parameters of this class. The size must be decided at compilation time by
  //  using a \code{const integer} or an \code{enum}.
  //
  //  Software Guide : EndLatex 

  // Software Guide : BeginCodeSnippet
  typedef itk::ConstantBoundaryCondition< InputImageType >  BoundaryConditionType;

  const unsigned int WindowRadius = 5;

  typedef itk::Function::HammingWindowFunction<WindowRadius>  WindowFunctionType;

  typedef itk::WindowedSincInterpolateImageFunction< 
                                          InputImageType, 
                                          WindowRadius,
                                          WindowFunctionType, 
                                          BoundaryConditionType, 
                                          double  >    InterpolatorType;

  InterpolatorType::Pointer   interpolator  = InterpolatorType::New();

  filter->SetInterpolator( interpolator );

  filter->SetDefaultPixelValue( 100 );
  // Software Guide : EndCodeSnippet


  //  Software Guide : BeginLatex
  //
  //  The parameters of the output image are taken from the input image.
  //
  //  Software Guide : EndLatex 

  // Software Guide : BeginCodeSnippet
  reader->Update();
  const InputImageType::SpacingType&
    spacing = reader->GetOutput()->GetSpacing();
  const InputImageType::PointType&
    origin  = reader->GetOutput()->GetOrigin();
  const InputImageType::DirectionType&
    direction  = reader->GetOutput()->GetDirection();
  InputImageType::SizeType size = 
      reader->GetOutput()->GetLargestPossibleRegion().GetSize();
  filter->SetOutputOrigin( origin );
  filter->SetOutputSpacing( spacing );
  filter->SetOutputDirection( direction );
  filter->SetSize( size );
  // Software Guide : EndCodeSnippet


  filter->SetInput( reader->GetOutput() );
  writer->SetInput( filter->GetOutput() );


  TransformType::OutputVectorType translation1;

  const double imageCenterX = origin[0] + spacing[0] * size[0] / 2.0;
  const double imageCenterY = origin[1] + spacing[1] * size[1] / 2.0;

  translation1[0] =   -imageCenterX;
  translation1[1] =   -imageCenterY;
  
  transform->Translate( translation1 );


  std::cout << "imageCenterX = " << imageCenterX << std::endl;
  std::cout << "imageCenterY = " << imageCenterY << std::endl;


  const double degreesToRadians = vcl_atan(1.0) / 45.0;
  const double angle = angleInDegrees * degreesToRadians;
  transform->Rotate2D( -angle, false );


  TransformType::OutputVectorType translation2;
  translation2[0] =   imageCenterX;
  translation2[1] =   imageCenterY;
  transform->Translate( translation2, false );
 

  //  Software Guide : BeginLatex
  //
  //  The output of the resampling filter is connected to a writer and the
  //  execution of the pipeline is triggered by a writer update.
  //
  //  Software Guide : EndLatex 

  // Software Guide : BeginCodeSnippet
  try 
    {
    writer->Update();
    }
  catch( itk::ExceptionObject & excep )
    {
    std::cerr << "Exception catched !" << std::endl;
    std::cerr << excep << std::endl;
    }
  // Software Guide : EndCodeSnippet

  return EXIT_SUCCESS;
}