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/*=========================================================================
*
* Copyright NumFOCUS
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#include <iostream>
#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 type alias to make the code more digestable
using FloatImage2DType = itk::Image<float, 2>;
// 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.emplace_back(if2);
}
} // 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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