SphinxExamples/src/Core/Common/IterateImageStartingAtSeed/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 "itkFloodFilledImageFunctionConditionalIterator.h"
#include "itkBinaryThresholdImageFunction.h"
 
using ImageType = itk::Image<unsigned char, 2>;
 
static void
CreateImage(ImageType::Pointer image);
 
int
main(int /*argc*/, char * /*argv*/[])
{
  auto image = ImageType::New();
  CreateImage(image);
 
  using FunctionType = itk::BinaryThresholdImageFunction<ImageType, double>;
  auto function = FunctionType::New();
  function->SetInputImage(image);
  function->ThresholdAbove(100); // we are looking to capture 255
 
  using IteratorType = itk::FloodFilledImageFunctionConditionalIterator<ImageType, FunctionType>;
 
  itk::Index<2> seed;
  seed[0] = 25;
  seed[1] = 25;
 
  std::vector<itk::Index<2>> seeds;
  seeds.push_back(seed);
 
  IteratorType it(image, function, seeds);
  it.GoToBegin();
 
  while (!it.IsAtEnd())
  {
    std::cout << it.GetIndex() << std::endl;
    ++it;
  }
 
  return EXIT_SUCCESS;
}
 
void
CreateImage(ImageType::Pointer image)
{
  itk::Index<2> start;
  start.Fill(0);
 
  itk::Size<2> size;
  size.Fill(100);
 
  itk::ImageRegion<2> region(start, size);
  image->SetRegions(region);
  image->Allocate();
  image->FillBuffer(0);
 
  // The line doesn't work at the moment, because it needs 8-connectivity.
 
  // Make a line
  for (unsigned int i = 20; i < 50; ++i)
  {
    itk::Index<2> pixelIndex;
    pixelIndex.Fill(i);
 
    image->SetPixel(pixelIndex, 255);
  }
 
  // Make a square
  //   for(unsigned int r = 20; r < 50; r++)
  //     {
  //     for(unsigned int c = 20; c < 50; c++)
  //       {
  //       itk::Index<2> pixelIndex;
  //       pixelIndex[0] = r;
  //       pixelIndex[1] = c;
  //
  //       image->SetPixel(pixelIndex, 255);
  //       }
  //     }
}