SphinxExamples/src/Core/Common/ObserveAnEvent/Code.cxx

/*=========================================================================
 *
 *  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 "itkImage.h"
#include "itkGaussianImageSource.h"
#include "itkCommand.h"
 
class MyCommand : public itk::Command
{
public:
  itkNewMacro(MyCommand);
 
  void
  Execute(itk::Object * caller, const itk::EventObject & event) override
  {
    Execute((const itk::Object *)caller, event);
  }
 
  void
  Execute(const itk::Object * caller, const itk::EventObject & event) override
  {
    if (!itk::ProgressEvent().CheckEvent(&event))
    {
      return;
    }
    const auto * processObject = dynamic_cast<const itk::ProcessObject *>(caller);
    if (!processObject)
    {
      return;
    }
    std::cout << "Progress: " << processObject->GetProgress() << std::endl;
  }
};
 
 
int
main()
{
  constexpr unsigned int Dimension = 2;
  using PixelType = unsigned char;
  using ImageType = itk::Image<PixelType, Dimension>;
 
  using SourceType = itk::GaussianImageSource<ImageType>;
  auto source = SourceType::New();
 
  auto size = ImageType::SizeType::Filled(128);
  source->SetSize(size);
 
  SourceType::ArrayType sigma;
  sigma.Fill(45.0);
  source->SetSigma(sigma);
 
  auto myCommand = MyCommand::New();
  source->AddObserver(itk::ProgressEvent(), myCommand);
 
  source->Update();
 
  return EXIT_SUCCESS;
}