Method RequestData

IO/SegY/vtkSegYReader.cxx:77–132

------------------------------------------------------------------------------

//------------------------------------------------------------------------------
int vtkSegYReader::RequestData(vtkInformation* vtkNotUsed(request),
  vtkInformationVector** vtkNotUsed(inputVector), vtkInformationVector* outputVector)
{
  vtkInformation* outInfo = outputVector->GetInformationObject(0);
  if (!outInfo)
  {
    return 0;
  }

  vtkDataObject* output = outInfo->Get(vtkDataObject::DATA_OBJECT());
  if (!output)
  {
    return 0;
  }

  this->Reader->SetVerticalCRS(this->VerticalCRS);
  switch (this->XYCoordMode)
  {
    case VTK_SEGY_SOURCE:
    {
      this->Reader->SetXYCoordBytePositions(72, 76);
      break;
    }
    case VTK_SEGY_CDP:
    {
      this->Reader->SetXYCoordBytePositions(180, 184);
      break;
    }
    case VTK_SEGY_CUSTOM:
    {
      this->Reader->SetXYCoordBytePositions(this->XCoordByte - 1, this->YCoordByte - 1);
      break;
    }
    default:
    {
      vtkErrorMacro(<< "Unknown value for XYCoordMode " << this->XYCoordMode);
      return 1;
    }
  }
  this->Reader->LoadTraces(this->DataExtent);
  this->UpdateProgress(0.5);
  if (this->Is3D && !this->StructuredGrid)
  {
    vtkImageData* imageData = vtkImageData::SafeDownCast(output);
    this->Reader->ExportData(
      imageData, this->DataExtent, this->DataOrigin, this->DataSpacing, this->DataSpacingSign);
  }
  else
  {
    vtkStructuredGrid* grid = vtkStructuredGrid::SafeDownCast(output);
    this->Reader->ExportData(grid, this->DataExtent, this->DataOrigin, this->DataSpacing);
    grid->Squeeze();
  }
  this->Reader->In.close();
  return 1;
}

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