def _new_page(self):
        """Helper function to start a new page. Not intended for external use.

        """
        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]