text: /*=========================================================================
   *
   *  Copyright Insight Software Consortium
   *
   *  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
   *
   *         http://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 "itkBinaryImageToLabelMapFilter.h"
  #include "itkImage.h"
  #include "itkImageFileWriter.h"
  #include "itkImageRegionIterator.h"
  #include "itkLabelMapToLabelImageFilter.h"
  #include "itkLabelMapContourOverlayImageFilter.h"
  #include "itkRGBPixel.h"
  
  namespace
  {
  using ImageType = itk::Image<unsigned char, 2>;
  }
  
  static void
  CreateImage(ImageType::Pointer image);
  
  int
  main(int, char *[])
  {
    ImageType::Pointer image = ImageType::New();
    CreateImage(image);
  
    using BinaryImageToLabelMapFilterType = itk::BinaryImageToLabelMapFilter<ImageType>;
    BinaryImageToLabelMapFilterType::Pointer binaryImageToLabelMapFilter = BinaryImageToLabelMapFilterType::New();
    binaryImageToLabelMapFilter->SetInput(image);
    binaryImageToLabelMapFilter->Update();
  
    using RGBPixelType = itk::RGBPixel<unsigned char>;
    using RGBImageType = itk::Image<RGBPixelType>;
  
    using LabelMapContourOverlayImageFilterType =
      itk::LabelMapContourOverlayImageFilter<BinaryImageToLabelMapFilterType::OutputImageType, ImageType, RGBImageType>;
    LabelMapContourOverlayImageFilterType::Pointer labelMapContourOverlayImageFilter =
      LabelMapContourOverlayImageFilterType::New();
    labelMapContourOverlayImageFilter->SetInput(binaryImageToLabelMapFilter->GetOutput());
    labelMapContourOverlayImageFilter->SetFeatureImage(image);
    labelMapContourOverlayImageFilter->SetOpacity(.5);
    labelMapContourOverlayImageFilter->Update();
  
    using WriterType = itk::ImageFileWriter<RGBImageType>;
    WriterType::Pointer writer = WriterType::New();
    writer->SetFileName("output.png");
    writer->SetInput(labelMapContourOverlayImageFilter->GetOutput());
    writer->Update();
  
    return EXIT_SUCCESS;
  }
  
  void
  CreateImage(ImageType::Pointer image)
  {
    // Create a black image with a white square
    ImageType::IndexType start;
    start.Fill(0);
  
    ImageType::SizeType size;
    size.Fill(100);
  
    ImageType::RegionType region;
    region.SetSize(size);
    region.SetIndex(start);
    image->SetRegions(region);
    image->Allocate();
    image->FillBuffer(0);
  
    itk::ImageRegionIterator<ImageType> imageIterator(image, image->GetLargestPossibleRegion());
  
    // Make two squares
    while (!imageIterator.IsAtEnd())
    {
      if ((imageIterator.GetIndex()[0] > 5 && imageIterator.GetIndex()[0] < 20) &&
          (imageIterator.GetIndex()[1] > 5 && imageIterator.GetIndex()[1] < 20))
      {
        imageIterator.Set(255);
      }
  
      if ((imageIterator.GetIndex()[0] > 50 && imageIterator.GetIndex()[0] < 70) &&
          (imageIterator.GetIndex()[1] > 50 && imageIterator.GetIndex()[1] < 70))
      {
        imageIterator.Set(255);
      }
      ++imageIterator;
    }
  
    using WriterType = itk::ImageFileWriter<ImageType>;
    WriterType::Pointer writer = WriterType::New();
    writer->SetFileName("image.png");
    writer->SetInput(image);
    writer->Update();
  }
  