Examples/SpatialObjects/ReadWriteSpatialObject.cxx

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// Software Guide : BeginLatex
//
// \index{itk::ReadWriteSpatialObject}
//
// Reading and writing SpatialObjects is a fairly simple task. The classes
// \doxygen{SpatialObjectReader} and \doxygen{SpatialObjectWriter} are used
// to read and write these objects, respectively. (Note these classes
// make use of the MetaIO auxiliary I/O routines and therefore have a
// \code{.meta} file suffix.)
//
// We begin this example by including the appropriate header files.
//
// Software Guide : EndLatex
 
// The following include to make Visual Studio 6 happy
#include "itkImageHelper.h"
 
// Software Guide : BeginCodeSnippet
#include "itkSpatialObjectReader.h"
#include "itkSpatialObjectWriter.h"
#include "itkEllipseSpatialObject.h"
 
// Software Guide : EndCodeSnippet
 
int
main(int, char *[])
{
 
  // Software Guide : BeginLatex
  //
  // Next, we create a SpatialObjectWriter that is templated over the
  // dimension of the object(s) we want to write.
  //
  // Software Guide : EndLatex
 
  // Software Guide : BeginCodeSnippet
  using WriterType = itk::SpatialObjectWriter<3>;
  WriterType::Pointer writer = WriterType::New();
  // Software Guide : EndCodeSnippet
 
  // Software Guide : BeginLatex
  //
  // For this example, we create an \doxygen{EllipseSpatialObject}.
  //
  // Software Guide : EndLatex
 
  // Software Guide : BeginCodeSnippet
  using EllipseType = itk::EllipseSpatialObject<3>;
  EllipseType::Pointer ellipse = EllipseType::New();
  ellipse->SetRadiusInObjectSpace(3);
  // Software Guide : EndCodeSnippet
  // Software Guide : BeginLatex
  //
  // Finally, we set to the writer the object to write using the
  // \code{SetInput()} method and we set the name of the file with
  // \code{SetFileName()} and call the \code{Update()} method to actually
  // write the information.
  //
  // Software Guide : EndLatex
 
  // Software Guide : BeginCodeSnippet
  writer->SetInput(ellipse);
  writer->SetFileName("ellipse.meta");
  writer->Update();
  // Software Guide : EndCodeSnippet
 
  // Software Guide : BeginLatex
  //
  // Now we are ready to open the freshly created object. We first create a
  // SpatialObjectReader which is also templated over the dimension of the
  // object in the file. This means that the file should contain only objects
  // with the same dimension.
  //
  // Software Guide : EndLatex
 
  // Software Guide : BeginCodeSnippet
  using ReaderType = itk::SpatialObjectReader<3>;
  ReaderType::Pointer reader = ReaderType::New();
  // Software Guide : EndCodeSnippet
 
  // Software Guide : BeginLatex
  //
  // Next we set the name of the file to read using \code{SetFileName()} and
  // we call the \code{Update()} method to read the file.
  //
  // Software Guide : EndLatex
 
  // Software Guide : BeginCodeSnippet
  reader->SetFileName("ellipse.meta");
  reader->Update();
  // Software Guide : EndCodeSnippet
 
  // Software Guide : BeginLatex
  //
  // To get the objects in the file you can call the \code{GetGroup()} method.
  // Calls to \code{GetGroup()} returns a pointer to a
  // \doxygen{GroupSpatialObject}.
  //
  // Software Guide : EndLatex
 
  // Software Guide : BeginCodeSnippet
  ReaderType::GroupType * group = reader->GetGroup();
  std::cout << "Number of objects in the group: ";
  std::cout << group->GetNumberOfChildren() << std::endl;
  // Software Guide : EndCodeSnippet
 
  return EXIT_SUCCESS;
}