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 "itkFastMarchingImageToNodePairContainerAdaptor.h"
  #include "itkFastMarchingImageFilterBase.h"
  #include "itkFastMarchingThresholdStoppingCriterion.h"
  #include "itkImageFileWriter.h"
  
  int
  main(int argc, char * argv[])
  {
    if (argc != 2)
    {
      std::cerr << "Usage:" << std::endl;
      std::cerr << argv[0] << " <OutputFileName>" << std::endl;
  
      return EXIT_FAILURE;
    }
  
    // create a fastmarching object
    using PixelType = float;
    constexpr unsigned int Dimension = 2;
  
    using FloatImageType = itk::Image<PixelType, Dimension>;
  
    using CriterionType = itk::FastMarchingThresholdStoppingCriterion<FloatImageType, FloatImageType>;
  
    using FastMarchingType = itk::FastMarchingImageFilterBase<FloatImageType, FloatImageType>;
  
    CriterionType::Pointer criterion = CriterionType::New();
    criterion->SetThreshold(100.);
  
    FastMarchingType::Pointer marcher = FastMarchingType::New();
    marcher->SetStoppingCriterion(criterion);
  
    // specify the size of the output image
    FloatImageType::SizeType size = { { 64, 64 } };
    marcher->SetOutputSize(size);
  
    // setup a speed image of ones
    FloatImageType::Pointer speedImage = FloatImageType::New();
  
    FloatImageType::RegionType region;
    region.SetSize(size);
  
    speedImage->SetLargestPossibleRegion(region);
    speedImage->SetBufferedRegion(region);
    speedImage->Allocate();
    speedImage->FillBuffer(1.0);
  
    // setup a 'alive image'
    FloatImageType::Pointer AliveImage = FloatImageType::New();
    AliveImage->SetLargestPossibleRegion(region);
    AliveImage->SetBufferedRegion(region);
    AliveImage->Allocate();
    AliveImage->FillBuffer(0.0);
  
    FloatImageType::OffsetType offset0 = { { 28, 35 } };
  
    FloatImageType::IndexType index;
    index.Fill(0);
    index += offset0;
  
    AliveImage->SetPixel(index, 1.0);
  
    // setup a 'trial image'
    FloatImageType::Pointer TrialImage = FloatImageType::New();
    TrialImage->SetLargestPossibleRegion(region);
    TrialImage->SetBufferedRegion(region);
    TrialImage->Allocate();
    TrialImage->FillBuffer(0.0);
  
    index[0] += 1;
    TrialImage->SetPixel(index, 1.0);
  
    index[0] -= 1;
    index[1] += 1;
    TrialImage->SetPixel(index, 1.0);
  
    index[0] -= 1;
    index[1] -= 1;
    TrialImage->SetPixel(index, 1.0);
  
    index[0] += 1;
    index[1] -= 1;
    TrialImage->SetPixel(index, 1.0);
  
    marcher->SetInput(speedImage);
  
    using AdaptorType = itk::FastMarchingImageToNodePairContainerAdaptor<FloatImageType, FloatImageType, FloatImageType>;
  
    AdaptorType::Pointer adaptor = AdaptorType::New();
  
    adaptor->SetAliveImage(AliveImage.GetPointer());
    adaptor->SetAliveValue(0.0);
  
    adaptor->SetTrialImage(TrialImage.GetPointer());
    adaptor->SetTrialValue(1.0);
    adaptor->Update();
  
    marcher->SetAlivePoints(adaptor->GetAlivePoints());
    marcher->SetTrialPoints(adaptor->GetTrialPoints());
  
    using WriterType = itk::ImageFileWriter<FloatImageType>;
    WriterType::Pointer writer = WriterType::New();
    writer->SetInput(marcher->GetOutput());
    writer->SetFileName(argv[1]);
  
    try
    {
      writer->Update();
    }
    catch (itk::ExceptionObject & error)
    {
      std::cerr << "Error: " << error << std::endl;
      return EXIT_FAILURE;
    }
  
    return EXIT_SUCCESS;
  }
  