在tkinter中更新嵌入matplotlib图的颜色

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

root = tk.Tk()
frame = tk.Frame(root)
frame.pack()

fig = Figure(figsize=(5, 4), dpi=100)
ax = fig.add_subplot(111)
canvas = FigureCanvasTkAgg(fig, master=frame)
canvas.draw()
canvas.get_tk_widget().pack(side=tk.TOP, fill=tk.BOTH, expand=1)

def update_color():
    ax.clear()  # 清除原有图形
    ax.plot([1, 2, 3, 4], [1, 4, 9, 16], color='red')  # 绘制新的图形
    canvas.draw()  # 更新画布

button = tk.Button(root, text="更新颜色", command=update_color)
button.pack()

tk.mainloop()