Function AllocateGetBlock

IO/NetCDF/vtkSLACReader.cxx:276–300

============================================================================= A convenience function that gets a block from a multiblock data set, performing allocation if necessary.

// A convenience function that gets a block from a multiblock data set,
// performing allocation if necessary.
static vtkUnstructuredGrid* AllocateGetBlock(
  vtkMultiBlockDataSet* blocks, unsigned int blockno, vtkInformationIntegerKey* typeKey)
{
  if (blockno > 1000)
  {
    vtkGenericWarningMacro(<< "Unexpected block number: " << blockno);
    blockno = 0;
  }

  if (blocks->GetNumberOfBlocks() <= blockno)
  {
    blocks->SetNumberOfBlocks(blockno + 1);
  }

  vtkUnstructuredGrid* grid = vtkUnstructuredGrid::SafeDownCast(blocks->GetBlock(blockno));
  if (!grid)
  {
    grid = vtkUnstructuredGrid::New();
    blocks->SetBlock(blockno, grid);
    blocks->GetMetaData(blockno)->Set(typeKey, 1);
    grid->Delete(); // Not really deleted.
  }

  return grid;
}

//=============================================================================
// Classes for storing midpoint maps.  These are basically wrappers around STL