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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: TransformReadWrite.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
//
// \index{itk::TransformReader}
// \index{itk::TransformWriter}
//
// This example shows how to read and write a transform
// using the \doxygen{TransformFileReader} and
// \doxygen{TransformFileWriter}.
// Let's first include the two appropriate header files.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
#include "itkTransformFileReader.h"
#include "itkTransformFileWriter.h"
// Software Guide : EndCodeSnippet
#include "itkAffineTransform.h"
#include "itkBSplineDeformableTransform.h"
#include "itkTransformFactory.h"
#include "itkTransformFileWriter.h"
int main(int itkNotUsed(ac), char* itkNotUsed(av)[])
{
typedef itk::AffineTransform<double,3> AffineTransformType;
AffineTransformType::Pointer affine = AffineTransformType::New();
AffineTransformType::InputPointType cor;
cor.Fill(12);
affine->SetCenter(cor);
typedef itk::BSplineDeformableTransform<double,3,5> BSplineTransformType;
BSplineTransformType::Pointer bspline = BSplineTransformType::New();
BSplineTransformType::RegionType region;
BSplineTransformType::SizeType size;
size.Fill(10);
region.SetSize(size);
bspline->SetGridRegion( region );
BSplineTransformType::OriginType origin;
origin.Fill ( 100 );
bspline->SetGridOrigin ( origin );
BSplineTransformType::SpacingType spacing;
spacing.Fill ( 1.5 );
bspline->SetGridSpacing ( spacing );
BSplineTransformType::ParametersType parameters( bspline->GetNumberOfParameters() );
bspline->SetParameters( parameters );
bspline->SetIdentity();
// Software Guide : BeginLatex
//
// The transform reader and writer are not templated. The conversion is
// done internally.when writing or reading the file. We create a writer
// using smart pointers.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
itk::TransformFileWriter::Pointer writer;
writer = itk::TransformFileWriter::New();
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// The first transform we have to write should be set using the
// SetInput() function. This function takes any \doxygen{Transform}
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
writer->SetInput( affine );
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// Moreover, additional transforms to be written can be set using the
// AddTransform() function. This function add the transform to the list.
// Note that the SetInput() function reinitializes the list.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
writer->AddTransform(bspline);
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
//
// Then we set the filename using the SetFileName() function. The file's extension
// does not matter for the transform reader/writer. Then we call the Update()
// function to write the transform(s) onto the disk.
//
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
writer->SetFileName( "Transforms.meta" );
// Software Guide : EndCodeSnippet
try
{
// Software Guide : BeginCodeSnippet
writer->Update();
// Software Guide : EndCodeSnippet
}
catch( itk::ExceptionObject & excp )
{
std::cerr << "Error while saving the transforms" << std::endl;
std::cerr << excp << std::endl;
return 0;
}
// Software Guide : BeginLatex
// In order to read a transform file, we instantiate a TransformFileReader.
// Like the writer, the reader is not templated.
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
itk::TransformFileReader::Pointer reader;
reader = itk::TransformFileReader::New();
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
// Some transforms (like the BSpline transform) might not be registered
// with the factory so we add them manually.
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
itk::TransformFactory<BSplineTransformType>::RegisterTransform();
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
// We then set the name of the file we want to read, and call the
// Update() function.
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
reader->SetFileName( "Transforms.meta" );
// Software Guide : EndCodeSnippet
try
{
// Software Guide : BeginCodeSnippet
reader->Update();
// Software Guide : EndCodeSnippet
}
catch( itk::ExceptionObject & excp )
{
std::cerr << "Error while reading the transform file" << std::endl;
std::cerr << excp << std::endl;
std::cerr << "[FAILED]" << std::endl;
return EXIT_FAILURE;
}
// Software Guide : BeginLatex
// The transform reader is not template and therefore it retunrs a list
// of \doxygen{Transform}. However, the reader instantiate the appropriate
// transform class when reading the file but it is up to the user to
// do the approriate cast.
// To get the output list of transform we use the GetTransformList() function.
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
typedef itk::TransformFileReader::TransformListType * TransformListType;
TransformListType transforms = reader->GetTransformList();
std::cout << "Number of transforms = " << transforms->size() << std::endl;
// Software Guide : EndCodeSnippet
// Software Guide : BeginLatex
// We then use an STL iterator to go trought the list of transforms. We show here
// how to do the proper casting of the resulting transform.
// Software Guide : EndLatex
// Software Guide : BeginCodeSnippet
itk::TransformFileReader::TransformListType::const_iterator it = transforms->begin();
if(!strcmp((*it)->GetNameOfClass(),"AffineTransform"))
{
AffineTransformType::Pointer affine_read = static_cast<AffineTransformType*>((*it).GetPointer());
affine_read->Print(std::cout);
}
it++;
if(!strcmp((*it)->GetNameOfClass(),"BSplineDeformableTransform"))
{
BSplineTransformType::Pointer bspline_read = static_cast<BSplineTransformType*>((*it).GetPointer());
bspline_read->Print(std::cout);
}
// Software Guide : EndCodeSnippet
return EXIT_SUCCESS;
}
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