如何使用tkinter和matplotlib在标签框中绘制图形？

import tkinter as tk
from matplotlib.figure import Figure
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg

root = tk.Tk()
label_frame = tk.LabelFrame(root)
label_frame.pack()

fig = Figure(figsize=(5, 4), dpi=100)
canvas = FigureCanvasTkAgg(fig, master=label_frame)
canvas.draw()
canvas.get_tk_widget().pack()

ax = fig.add_subplot(111)
ax.plot([1, 2, 3, 4], [1, 4, 9, 16])

tk.mainloop()