text: /*=========================================================================
   *
   *  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 "itkVectorImage.h"
  #include "itkImageRegionIterator.h"
  #include "itkMinimumMaximumImageCalculator.h"
  #include "itkVectorIndexSelectionCastImageFilter.h"
  
  using VectorImageType = itk::VectorImage<float, 2>;
  using ScalarImageType = itk::Image<float, 2>;
  
  static void
  CreateImage(VectorImageType::Pointer image);
  
  int
  main(int, char *[])
  {
    VectorImageType::Pointer image = VectorImageType::New();
    CreateImage(image);
  
    using IndexSelectionType = itk::VectorIndexSelectionCastImageFilter<VectorImageType, ScalarImageType>;
    IndexSelectionType::Pointer indexSelectionFilter = IndexSelectionType::New();
    indexSelectionFilter->SetIndex(0);
    indexSelectionFilter->SetInput(image);
  
    using ImageCalculatorFilterType = itk::MinimumMaximumImageCalculator<ScalarImageType>;
    ImageCalculatorFilterType::Pointer imageCalculatorFilter = ImageCalculatorFilterType::New();
    imageCalculatorFilter->SetImage(indexSelectionFilter->GetOutput());
    imageCalculatorFilter->Compute();
  
    return EXIT_SUCCESS;
  }
  
  void
  CreateImage(VectorImageType::Pointer image)
  {
    VectorImageType::IndexType start;
    start.Fill(0);
  
    VectorImageType::SizeType size;
    size.Fill(2);
  
    VectorImageType::RegionType region(start, size);
  
    image->SetRegions(region);
    image->SetNumberOfComponentsPerPixel(3);
    image->Allocate();
  
    using VariableVectorType = itk::VariableLengthVector<double>;
    VariableVectorType variableLengthVector;
    variableLengthVector.SetSize(3);
    variableLengthVector[0] = 1.1;
    variableLengthVector[1] = 2.2;
    variableLengthVector[2] = 3.3;
  
    image->FillBuffer(variableLengthVector);
  }
  