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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkCyclicReferences.cxx,v $
Language: C++
Date: $Date: 2003-09-10 14:30:06 $
Version: $Revision: 1.23 $
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
#include <iostream>
#include "itkImage.h"
#include "itkRandomImageSource.h"
#include "itkShrinkImageFilter.h"
#include "itkCommand.h"
#include "itkTextOutput.h"
// The following class is used to support callbacks
// on the shrink filter in the pipeline that follows later.
class DeleteEvent
{
public:
void Delete(const itk::Object *caller, const itk::EventObject &)
{std::cout << "Deleting: " << caller->GetNameOfClass() << std::endl;}
};
// Note about scoping: Lots of blocks are created here to force the order
// of deletion of objects to insure that the output is in the correct order.
// (Deletion of the smart pointers occurs automatically as scope is exited.)
//
int itkCyclicReferences(int, char* [] )
{
// Comment the following if you want to use the itk text output window
itk::OutputWindow::SetInstance( itk::TextOutput::New() );
// Uncomment the following if you want to see each message independently
// itk::OutputWindow::GetInstance()->PromptUserOn();
// Begin by creating a simple pipeline. Use a scalar as a pixel.
//
// Create a typedef to make the code more digestable
typedef itk::Image<float,2> FloatImage2DType;
// Test the deletion of an image with native type.
// (scope operators cause automatic smart pointer destruction)
{//image
itk::Image<float,2>::Pointer if2 = itk::Image<float,2>::New();
DeleteEvent deleteEvent;
itk::MemberCommand<DeleteEvent>::Pointer deleteCommand;
deleteCommand = itk::MemberCommand<DeleteEvent>::New();
deleteCommand->SetCallbackFunction(&deleteEvent, &DeleteEvent::Delete);
if2->AddObserver(itk::DeleteEvent(), deleteCommand);
//test unregister from vector of data objects
{
std::vector<itk::DataObject::Pointer> v;
v.push_back(if2.GetPointer());
}
}//image
// Create another source object (in this case a random image generator).
// The source object is templated on the output type.
//
{//random
itk::RandomImageSource<FloatImage2DType>::Pointer random;
random = itk::RandomImageSource<FloatImage2DType>::New();
random->SetMin(0.0);
random->SetMax(1.0);
DeleteEvent deleteRandom;
itk::MemberCommand<DeleteEvent>::Pointer deleteRandomCommand;
deleteRandomCommand = itk::MemberCommand<DeleteEvent>::New();
deleteRandomCommand->SetCallbackFunction(&deleteRandom, &DeleteEvent::Delete);
random->AddObserver(itk::DeleteEvent(), deleteRandomCommand);
// Create a filter...shrink the image by an integral amount. We also
// add some callbacks to the start, progress, and end filter execution
// methods. The filter is templated on the input and output data types.
//
{//shrink
itk::ShrinkImageFilter<FloatImage2DType,FloatImage2DType>::Pointer shrink;
shrink = itk::ShrinkImageFilter<FloatImage2DType,FloatImage2DType>::New();
shrink->SetInput(random->GetOutput());
shrink->SetShrinkFactors(2);
DeleteEvent deleteShrink;
itk::MemberCommand<DeleteEvent>::Pointer deleteShrinkCommand;
deleteShrinkCommand = itk::MemberCommand<DeleteEvent>::New();
deleteShrinkCommand->SetCallbackFunction(&deleteShrink, &DeleteEvent::Delete);
shrink->AddObserver(itk::DeleteEvent(), deleteShrinkCommand);
}//shrink
}//random
return EXIT_SUCCESS;
}
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