Method RequestData

Infovis/BoostGraphAlgorithms/vtkBoostLogWeighting.cxx:45–129

}

int vtkBoostLogWeighting::RequestData(
  vtkInformation*, vtkInformationVector** inputVector, vtkInformationVector* outputVector)
{
  try
  {
    vtkArrayData* const input_data = vtkArrayData::GetData(inputVector[0]);
    if (!input_data)
      throw std::runtime_error("Missing input vtkArrayData on port 0.");
    if (input_data->GetNumberOfArrays() != 1)
      throw std::runtime_error("Input vtkArrayData must contain exactly one array.");
    vtkTypedArray<double>* const input_array =
      vtkTypedArray<double>::SafeDownCast(input_data->GetArray(0));
    if (!input_array)
      throw std::runtime_error("Unsupported input array type.");

    vtkTypedArray<double>* const output_array =
      vtkTypedArray<double>::SafeDownCast(input_array->DeepCopy());
    vtkArrayData* const output = vtkArrayData::GetData(outputVector);
    output->ClearArrays();
    output->AddArray(output_array);
    output_array->Delete();

    const vtkIdType value_count = input_array->GetNonNullSize();
    switch (this->Base)
    {
      case BASE_E:
      {
        if (this->EmitProgress)
        {
          for (vtkIdType i = 0; i != value_count; ++i)
          {
            output_array->SetValueN(i, boost::math::log1p(output_array->GetValueN(i)));

            double progress = static_cast<double>(i) / static_cast<double>(value_count);
            this->InvokeEvent(vtkCommand::ProgressEvent, &progress);
          }
        }
        else
        {
          for (vtkIdType i = 0; i != value_count; ++i)
          {
            output_array->SetValueN(i, boost::math::log1p(output_array->GetValueN(i)));
          }
        }
        break;
      }
      case BASE_2:
      {
        const double ln2 = log(2.0);
        if (this->EmitProgress)
        {
          for (vtkIdType i = 0; i != value_count; ++i)
          {
            output_array->SetValueN(i, 1.0 + log(output_array->GetValueN(i)) / ln2);

            double progress = static_cast<double>(i) / static_cast<double>(value_count);
            this->InvokeEvent(vtkCommand::ProgressEvent, &progress);
          }