Method SetSpanState

Imaging/Core/vtkImagePointDataIterator.cxx:259–291

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

//------------------------------------------------------------------------------
void vtkImagePointDataIterator::SetSpanState(int idX)
{
  // Find the span that includes idX
  bool inStencil = false;
  int* spans = *this->SpanListPointer;
  int n = *this->SpanCountPointer;
  int i;
  for (i = 0; i < n; i++)
  {
    if (spans[i] > idX)
    {
      break;
    }
    inStencil = !inStencil;
  }

  // Set the primary span state variables
  this->SpanIndex = i;
  this->InStencil = inStencil;

  // Clamp the span end to MaxX+1
  int endIdX = this->Extent[1] + 1;
  if (i < n && spans[i] <= this->Extent[1])
  {
    endIdX = spans[i];
  }

  // Compute the pointers for idX and endIdX
  vtkIdType rowStart = this->RowEnd - (this->RowIncrement - this->RowEndIncrement);

  this->Id = rowStart + (idX - this->Extent[0]);
  this->SpanEnd = rowStart + (endIdX - this->Extent[0]);
}

//------------------------------------------------------------------------------
void vtkImagePointDataIterator::NextSpan()