如何在python kivy中更改LineRectangle类中的参数？

from kivy.uix.widget import Widget
from kivy.graphics import Line, Color

class LineRectangle(Widget):
    def __init__(self, **kwargs):
        super(LineRectangle, self).__init__(**kwargs)
        with self.canvas:
            self.color = Color(1, 0, 0, 1)  # 设置矩形的颜色
            self.line = Line(rectangle=(0, 0, 100, 100), width=2)  # 设置矩形的位置、大小和线宽

line_rectangle = LineRectangle()
line_rectangle.line.rectangle = (50, 50, 200, 200)  # 修改矩形的位置和大小
line_rectangle.line.width = 4  # 修改线宽
line_rectangle.color.rgba = (0, 1, 0, 1)  # 修改矩形的颜色