def height(self) -> int:
        """Determines how many entry rows are in the diagram."""
        max_y = -1.0
        for _, y in self.entries.keys():
            max_y = max(max_y, y)
        for h in self.horizontal_lines:
            max_y = max(max_y, h.y)
        for v in self.vertical_lines:
            max_y = max(max_y, v.y1, v.y2)
        return 1 + int(max_y)
Determines how many entry rows are in the diagram.