SphinxExamples/src/Core/Common/SetPixelValueInOneImage/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
 *
 *         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 "itkImage.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;
  }
 
  constexpr unsigned int Dimension = 2;
  using PixelType = unsigned char;
 
  using ImageType = itk::Image<PixelType, Dimension>;
 
  ImageType::RegionType region;
 
  ImageType::IndexType start;
  start.Fill(0);
 
  region.SetIndex(start);
 
  ImageType::SizeType size;
  size[0] = 200;
  size[1] = 300;
 
  region.SetSize(size);
 
  ImageType::Pointer image = ImageType::New();
  image->SetRegions(region);
  image->Allocate();
  image->FillBuffer(itk::NumericTraits<PixelType>::Zero);
 
  ImageType::IndexType pixelIndex;
 
  for (ImageType::IndexValueType r = 0; r < 50; r++)
  {
    pixelIndex[0] = 4 * r;
    pixelIndex[1] = 4 * r;
 
    image->SetPixel(pixelIndex, 128);
 
    pixelIndex[0] = 4 * r;
    pixelIndex[1] = 200 - 4 * r;
 
    image->SetPixel(pixelIndex, 255);
  }
 
  for (ImageType::IndexValueType r = 0; r < 25; r++)
  {
    pixelIndex[0] = 8 * r;
    pixelIndex[1] = 200 + 4 * r;
 
    image->SetPixel(pixelIndex, 128);
 
    pixelIndex[0] = 8 * r;
    pixelIndex[1] = 250;
 
    image->SetPixel(pixelIndex, 180);
  }
 
  pixelIndex[0] = 95;
  pixelIndex[1] = 150;
 
  image->SetPixel(pixelIndex, 200);
 
  pixelIndex[0] = 100;
  pixelIndex[1] = 150;
 
  image->SetPixel(pixelIndex, 200);
 
  pixelIndex[0] = 105;
  pixelIndex[1] = 150;
 
  image->SetPixel(pixelIndex, 200);
 
  pixelIndex[0] = 100;
  pixelIndex[1] = 155;
 
  image->SetPixel(pixelIndex, 200);
 
  pixelIndex[0] = 100;
  pixelIndex[1] = 145;
 
  image->SetPixel(pixelIndex, 200);
 
  using WriterType = itk::ImageFileWriter<ImageType>;
  WriterType::Pointer writer = WriterType::New();
  writer->SetInput(image);
  writer->SetFileName(argv[1]);
 
  try
  {
    writer->Update();
  }
  catch (itk::ExceptionObject & error)
  {
    std::cerr << "Error: " << error << std::endl;
    return EXIT_FAILURE;
  }
 
  return EXIT_SUCCESS;
}