SphinxExamples/src/Filtering/ImageCompose/CreateVectorImageFromScalarImages/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 "itkComposeImageFilter.h"
#include "itkVectorImage.h"
 
namespace
{
using VectorImageType = itk::VectorImage<unsigned char, 2>;
using ScalarImageType = itk::Image<unsigned char, 2>;
} // namespace
 
static void
CreateImage(ScalarImageType::Pointer image);
 
int
main()
{
  auto image0 = ScalarImageType::New();
  CreateImage(image0);
 
  auto image1 = ScalarImageType::New();
  CreateImage(image1);
 
  auto image2 = ScalarImageType::New();
  CreateImage(image2);
 
  using ImageToVectorImageFilterType = itk::ComposeImageFilter<ScalarImageType>;
  auto imageToVectorImageFilter = ImageToVectorImageFilterType::New();
  imageToVectorImageFilter->SetInput(0, image0);
  imageToVectorImageFilter->SetInput(1, image1);
  imageToVectorImageFilter->SetInput(2, image2);
  imageToVectorImageFilter->Update();
 
  VectorImageType::Pointer vectorImage = imageToVectorImageFilter->GetOutput();
 
  return EXIT_SUCCESS;
}
 
void
CreateImage(ScalarImageType::Pointer image)
{
  ScalarImageType::IndexType start;
  start.Fill(0);
 
  ScalarImageType::SizeType size;
  size.Fill(100);
 
  ScalarImageType::RegionType region(start, size);
 
  image->SetRegions(region);
  image->Allocate();
  image->FillBuffer(0);
}