code: def _calculate_edges(self):
          
          # Calculate the left edge of the label.
          left = self.specs.left_margin
          left += (self.specs.label_width * (self._position[1] - 1))
          if self.specs.column_gap:
              left += (self.specs.column_gap * (self._position[1] - 1))
          left *= mm
  
          # And the bottom.
          bottom = self.specs.sheet_height - self.specs.top_margin
          bottom -= (self.specs.label_height * self._position[0])
          if self.specs.row_gap:
              bottom -= (self.specs.row_gap * (self._position[0] - 1))
          bottom *= mm
  
          # Done.
          return float(left), float(bottom)
docs: Calculate edges of the current label. Not intended for external use.