SphinxExamples/src/Core/Common/ReadAPointSet/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 "itkVTKPolyDataReader.h"
 
#include "itkImage.h"
#include "itkPointSet.h"
 
#include <string>
#include <iostream>
 
int
main(int argc, char * argv[])
{
  if (argc < 2)
  {
    std::cout << "Usage: " << argv[0] << " Input(.vtk)" << std::endl;
    return EXIT_FAILURE;
  }
 
  std::string InputFilename = argv[1];
  std::cout << "Input file: " << InputFilename << std::endl;
 
  // using PointSetType = itk::PointSet<double, 3 >;
  // auto pointsSet = PointSetType::New();
  // using PointType = PointSetType::PointType;
 
  constexpr unsigned int Dimension = 3;
 
  using CoordType = float;
  using MeshType = itk::Mesh<CoordType, Dimension>;
 
  using ReaderType = itk::VTKPolyDataReader<MeshType>;
  auto polyDataReader = ReaderType::New();
 
  using PointType = ReaderType::PointType;
  using VectorType = ReaderType::VectorType;
 
  polyDataReader->SetFileName(InputFilename.c_str());
 
  try
  {
    polyDataReader->Update();
  }
  catch (const itk::ExceptionObject & error)
  {
    std::cerr << "Error: " << error << std::endl;
    return EXIT_FAILURE;
  }
 
  std::cout << "polyDataReader:" << std::endl;
  std::cout << polyDataReader << std::endl;
 
  MeshType::Pointer mesh = polyDataReader->GetOutput();
 
  PointType point;
 
  std::cout << "Testing itk::VTKPolyDataReader" << std::endl;
 
  unsigned int numberOfPoints = mesh->GetNumberOfPoints();
  unsigned int numberOfCells = mesh->GetNumberOfCells();
 
  std::cout << "numberOfPoints= " << numberOfPoints << std::endl;
  std::cout << "numberOfCells= " << numberOfCells << std::endl;
 
  if (!numberOfPoints)
  {
    std::cerr << "ERROR: numberOfPoints= " << numberOfPoints << std::endl;
    return EXIT_FAILURE;
  }
 
  if (!numberOfCells)
  {
    std::cerr << "ERROR: numberOfCells= " << numberOfCells << std::endl;
    return EXIT_FAILURE;
  }
 
  // Retrieve points
  for (unsigned int i = 0; i < numberOfPoints; ++i)
  {
    PointType pp;
    bool      pointExists = mesh->GetPoint(i, &pp);
 
    if (pointExists)
    {
      std::cout << "Point is = " << pp << std::endl;
    }
  }
  return EXIT_SUCCESS;
}