code: def _new_page(self):
          
          self._current_page = Drawing(*self._pagesize)
          if self._bgimage:
              self._current_page.add(self._bgimage)
          self._pages.append(self._current_page)
          self.page_count += 1
          self._position = [1, 0]
docs: Helper function to start a new page. Not intended for external use.