Method NextSpan

Imaging/Core/vtkImagePointDataIterator.cxx:294–380

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//------------------------------------------------------------------------------
void vtkImagePointDataIterator::NextSpan()
{
  if (this->SpanEnd == this->RowEnd)
  {
    int spanIncr = 1;

    if (this->SpanEnd != this->SliceEnd)
    {
      // Move to the next row
      this->Id = this->RowEnd + this->RowEndIncrement;
      this->RowEnd += this->RowIncrement;
      this->SpanEnd = this->RowEnd;
      this->Index[1]++;
    }
    else if (this->SpanEnd != this->End)
    {
      // Move to the next slice
      this->Id = this->SliceEnd + this->SliceEndIncrement;
      this->SliceEnd += this->SliceIncrement;
      this->RowEnd = this->Id + (this->RowIncrement - this->RowEndIncrement);
      this->SpanEnd = this->RowEnd;
      this->Index[1] = this->StartY;
      this->Index[2]++;
      spanIncr += this->SpanSliceEndIncrement;
    }
    else
    {
      // reached End
      this->Id = this->End;
      return;
    }

    // Start of next row
    this->Index[0] = this->Extent[0];

    if (this->HasStencil)
    {
      if ((this->Index[1] >= this->Extent[2]) && (this->Index[1] <= this->Extent[3]) &&
        (this->Index[2] >= this->Extent[4]) && (this->Index[2] <= this->Extent[5]))
      {
        this->SpanCountPointer += spanIncr;
        this->SpanListPointer += spanIncr;
        this->SetSpanState(this->Extent[0]);
      }
      else
      {
        this->InStencil = false;
      }
    }

    if (this->Algorithm)
    {
      this->ReportProgress();
    }
  }
  else
  {
    // Move to the next span in the current row