Method ReadVectorData

IO/Legacy/vtkDataReader.cxx:2302–2350

------------------------------------------------------------------------------ Read vector point attributes. Return 0 if error.

//------------------------------------------------------------------------------
// Read vector point attributes. Return 0 if error.
int vtkDataReader::ReadVectorData(vtkDataSetAttributes* a, vtkIdType numPts)
{
  int skipVector = 0;
  char line[256], name[256];
  vtkDataArray* data;
  char buffer[256];

  if (!(this->ReadString(buffer) && this->ReadString(line)))
  {
    const char* fname = this->CurrentFileName.c_str();
    vtkErrorMacro(<< "Cannot read vector data!"
                  << " for file: " << (fname ? fname : "(Null FileName)"));
    return 0;
  }
  this->DecodeString(name, buffer);

  //
  // See whether vector has been already read or vector name (if specified)
  // matches name in file.
  //
  if (a->GetVectors() != nullptr || (this->VectorsName && strcmp(name, this->VectorsName) != 0))
  {
    skipVector = 1;
  }

  data = vtkArrayDownCast<vtkDataArray>(this->ReadArray(line, numPts, 3));
  if (data != nullptr)
  {
    data->SetName(name);
    if (!skipVector)
    {
      a->SetVectors(data);
    }
    else if (this->ReadAllVectors)
    {
      a->AddArray(data);
    }
    data->Delete();
  }
  else
  {
    return 0;
  }

  float progress = this->GetProgress();
  this->UpdateProgress(progress + 0.5 * (1.0 - progress));

  return 1;
}

//------------------------------------------------------------------------------
// Read normal point attributes. Return 0 if error.