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>;
  GroupType::Pointer 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>;
  EllipseType::Pointer 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
  GroupType::VectorType offset;
  offset.Fill(10);
  myGroup->GetModifiableObjectToParentTransform()->SetOffset(offset);
  myGroup->ComputeObjectToWorldTransform();
// 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
  GroupType::PointType point;
  point.Fill(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;
}