Examples/SpatialObjects/GroupSpatialObject.cxx

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// Software Guide : BeginLatex
//
// \index{itk::GroupSpatialObject}
//
// A \doxygen{GroupSpatialObject} does not have
// any data associated with it. It can be used to group objects
// or to add transforms to a current object.
// In this example we show how to use a GroupSpatialObject.
//
// Let's begin by including the appropriate header file.
//
// Software Guide : EndLatex
 
// Software Guide : BeginCodeSnippet
#include "itkGroupSpatialObject.h"
// Software Guide : EndCodeSnippet
#include "itkEllipseSpatialObject.h"
 
int
main(int, char *[])
{
  // Software Guide : BeginLatex
  //
  // The \doxygen{GroupSpatialObject} is templated
  // over the dimensionality of the object.
  //
  // Software Guide : EndLatex
 
  // Software Guide : BeginCodeSnippet
  using GroupType = itk::GroupSpatialObject<3>;
  auto myGroup = GroupType::New();
  // Software Guide : EndCodeSnippet
 
  // Software Guide : BeginLatex
  //
  // Next, we create an \doxygen{EllipseSpatialObject} and add it to
  // the group.
  //
  // Software Guide : EndLatex
 
  // Software Guide : BeginCodeSnippet
  using EllipseType = itk::EllipseSpatialObject<3>;
  auto myEllipse = EllipseType::New();
  myEllipse->SetRadiusInObjectSpace(2);
 
  myGroup->AddChild(myEllipse);
  // Software Guide : EndCodeSnippet
 
  // Software Guide : BeginLatex
  //
  // We then translate the group by 10mm in each direction.
  // Therefore the ellipse is translated in physical space at the same time.
  //
  // Software Guide : EndLatex
 
  // Software Guide : BeginCodeSnippet
  auto offset = itk::MakeFilled<GroupType::VectorType>(10);
  myGroup->GetModifiableObjectToParentTransform()->SetOffset(offset);
  myGroup->Update();
  // Software Guide : EndCodeSnippet
 
  // Software Guide : BeginLatex
  //
  // We can then query if a point is inside the group using the
  // \code{IsInsideInWorldSpace()} function. We need to specify in this case
  // that we want to consider all the hierarchy, therefore we set the depth
  // to 2.
  //
  // Software Guide : EndLatex
 
  // Software Guide : BeginCodeSnippet
  auto point = itk::MakeFilled<GroupType::PointType>(10);
  std::cout << "Is my point " << point
            << " inside?: " << myGroup->IsInsideInWorldSpace(point, 2)
            << std::endl;
  // Software Guide : EndCodeSnippet
 
  // Software Guide : BeginLatex
  //
  // Like any other SpatialObjects we can remove the ellipse from the group
  // using the \code{RemoveChild()} method.
  //
  // Software Guide : EndLatex
 
  // Software Guide : BeginCodeSnippet
  myGroup->RemoveChild(myEllipse);
  // Software Guide : EndCodeSnippet
 
  return EXIT_SUCCESS;
}