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 "itkImage.h"
  #include "itkImageFileReader.h"
  #include "itkImageFileWriter.h"
  #include "itkMatrix.h"
  
  #include "itkResampleImageFilter.h"
  
  int main( int argc, char * argv[] )
  {
    if( argc < 7 )
      {
      std::cerr << "Usage: " << std::endl;
      std::cerr << argv[0] << "  inputImageFile  outputImageFile";
      std::cerr << "  direction cosines" << std::endl;
      return EXIT_FAILURE;
      }
  
    constexpr unsigned int Dimension = 2;
    using InputPixelType = unsigned char;
    using OutputPixelType = unsigned char;
    using InputImageType = itk::Image< InputPixelType,  Dimension >;
    using OutputImageType = itk::Image< OutputPixelType, Dimension >;
  
    using ReaderType = itk::ImageFileReader< InputImageType  >;
    using WriterType = itk::ImageFileWriter< OutputImageType >;
  
    ReaderType::Pointer reader = ReaderType::New();
    WriterType::Pointer writer = WriterType::New();
  
    reader->SetFileName( argv[1] );
    writer->SetFileName( argv[2] );
  
  
    using FilterType = itk::ResampleImageFilter<InputImageType,OutputImageType>;
    FilterType::Pointer filter = FilterType::New();
  
    filter->SetDefaultPixelValue( 0 );
  
      {
      //pixel spacing in millimeters
      const double spacing[ Dimension ] = { 1.0, 1.0 };
      filter->SetOutputSpacing( spacing );
      }
  
      {
      // space coordinate of origin
      const double origin[ Dimension ] = { 0.0, 0.0 };
      filter->SetOutputOrigin( origin );
      }
  
    OutputImageType::DirectionType direction;
    direction(0,0) = atoi(argv[3]);
    direction(1,0) = atoi(argv[4]);
    direction(0,1) = atoi(argv[5]);
    direction(1,1) = atoi(argv[6]);
    filter->SetOutputDirection(direction);
  
    InputImageType::SizeType   size;
    size[0] = 300;  // number of pixels along X
    size[1] = 300;  // number of pixels along Y
  
    filter->SetSize( size );
    filter->SetInput( reader->GetOutput() );
    writer->SetInput( filter->GetOutput() );
    writer->Update();
  
    return EXIT_SUCCESS;
  }
  