Method RequestData

Infovis/Core/vtkTableToSparseArray.cxx:129–201

//------------------------------------------------------------------------------

int vtkTableToSparseArray::RequestData(
  vtkInformation*, vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  vtkTable* const table = vtkTable::GetData(inputVector[0]);

  std::vector<vtkAbstractArray*> coordinates(this->Implementation->Coordinates.size());
  for (size_t i = 0; i != this->Implementation->Coordinates.size(); ++i)
  {
    coordinates[i] = table->GetColumnByName(this->Implementation->Coordinates[i].c_str());
    if (!coordinates[i])
    {
      vtkErrorMacro(<< "missing coordinate array: " << this->Implementation->Coordinates[i]);
    }
  }
  // See http://developers.sun.com/solaris/articles/cmp_stlport_libCstd.html
  // Language Feature: Partial Specializations
  // Workaround
  int n = 0;
#ifdef _RWSTD_NO_CLASS_PARTIAL_SPEC
  std::count(coordinates.begin(), coordinates.end(), static_cast<vtkAbstractArray*>(0), n);
#else
  n = std::count(coordinates.begin(), coordinates.end(), static_cast<vtkAbstractArray*>(nullptr));
#endif
  if (n != 0)
  {
    return 0;
  }

  vtkAbstractArray* const values = table->GetColumnByName(this->Implementation->Values.c_str());
  if (!values)
  {
    vtkErrorMacro(<< "missing value array: " << this->Implementation->Values);
    return 0;
  }

  vtkSparseArray<double>* const array = vtkSparseArray<double>::New();
  array->Resize(
    vtkArrayExtents::Uniform(static_cast<vtkArrayExtents::DimensionT>(coordinates.size()), 0));

  for (size_t i = 0; i != coordinates.size(); ++i)
  {
    array->SetDimensionLabel(static_cast<vtkArray::DimensionT>(i), coordinates[i]->GetName());
  }

  vtkArrayCoordinates output_coordinates;
  output_coordinates.SetDimensions(
    static_cast<vtkArrayCoordinates::DimensionT>(coordinates.size()));
  for (vtkIdType i = 0; i != table->GetNumberOfRows(); ++i)
  {
    for (size_t j = 0; j != coordinates.size(); ++j)
    {
      output_coordinates[static_cast<vtkArrayCoordinates::DimensionT>(j)] =
        coordinates[j]->GetVariantValue(i).ToInt();
    }
    array->AddValue(output_coordinates, values->GetVariantValue(i).ToDouble());
  }

  if (this->Implementation->ExplicitOutputExtents)