SphinxExamples/src/Core/Common/FindMaxAndMinInImage/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 "itkImageFileWriter.h"
#include "itkMinimumMaximumImageCalculator.h"
#include "itkImageFileReader.h"
 
#include <itkImageToVTKImageFilter.h>
 
#include "vtkVersion.h"
#include "vtkImageViewer.h"
#include "vtkImageMapper3D.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkSmartPointer.h"
#include "vtkImageActor.h"
#include "vtkInteractorStyleImage.h"
#include "vtkRenderer.h"
#include "vtkSphereSource.h"
#include "vtkPolyDataMapper.h"
#include "vtkActor.h"
#include "vtkProperty.h"
 
using ImageType = itk::Image<unsigned char, 2>;
 
int
main(int argc, char * argv[])
{
  if (argc < 2)
  {
    std::cerr << "Required: filename" << std::endl;
 
    return EXIT_FAILURE;
  }
 
  const auto input = itk::ReadImage<ImageType>(argv[1]);
 
  using ImageCalculatorFilterType = itk::MinimumMaximumImageCalculator<ImageType>;
 
  auto imageCalculatorFilter = ImageCalculatorFilterType::New();
  imageCalculatorFilter->SetImage(input);
  imageCalculatorFilter->Compute();
 
  using ConnectorType = itk::ImageToVTKImageFilter<ImageType>;
  auto originalConnector = ConnectorType::New();
 
  originalConnector->SetInput(input);
 
  vtkSmartPointer<vtkImageActor> originalActor = vtkSmartPointer<vtkImageActor>::New();
#if VTK_MAJOR_VERSION <= 5
  originalActor->SetInput(originalConnector->GetOutput());
#else
  originalConnector->Update();
  originalActor->GetMapper()->SetInputData(originalConnector->GetOutput());
#endif
 
  vtkSmartPointer<vtkSphereSource> minimumSphereSource = vtkSmartPointer<vtkSphereSource>::New();
  ImageType::IndexType             minimumLocation = imageCalculatorFilter->GetIndexOfMinimum();
  minimumSphereSource->SetCenter(minimumLocation[0], minimumLocation[1], 0);
  minimumSphereSource->SetRadius(10);
 
  vtkSmartPointer<vtkPolyDataMapper> minimumMapper = vtkSmartPointer<vtkPolyDataMapper>::New();
  minimumMapper->SetInputConnection(minimumSphereSource->GetOutputPort());
  vtkSmartPointer<vtkActor> minimumActor = vtkSmartPointer<vtkActor>::New();
  minimumActor->SetMapper(minimumMapper);
  minimumActor->GetProperty()->SetColor(0, 1, 0);
 
  vtkSmartPointer<vtkSphereSource> maximumSphereSource = vtkSmartPointer<vtkSphereSource>::New();
  maximumSphereSource->SetRadius(10);
  ImageType::IndexType maximumLocation = imageCalculatorFilter->GetIndexOfMaximum();
  maximumSphereSource->SetCenter(maximumLocation[0], maximumLocation[1], 0);
 
  vtkSmartPointer<vtkPolyDataMapper> maximumMapper = vtkSmartPointer<vtkPolyDataMapper>::New();
  maximumMapper->SetInputConnection(maximumSphereSource->GetOutputPort());
  vtkSmartPointer<vtkActor> maximumActor = vtkSmartPointer<vtkActor>::New();
  maximumActor->SetMapper(maximumMapper);
  maximumActor->GetProperty()->SetColor(1, 0, 0);
 
 
  // Visualize
  vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
 
  vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New();
  interactor->SetRenderWindow(renderWindow);
 
  vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
  renderWindow->AddRenderer(renderer);
 
  // Add the sphere to the left and the cube to the right
  renderer->AddActor(originalActor);
  renderer->AddActor(minimumActor);
  renderer->AddActor(maximumActor);
 
  renderer->ResetCamera();
 
  renderWindow->Render();
 
  vtkSmartPointer<vtkInteractorStyleImage> style = vtkSmartPointer<vtkInteractorStyleImage>::New();
  interactor->SetInteractorStyle(style);
 
  interactor->Start();
 
  return EXIT_SUCCESS;
}