在嵌入tkinter的matplotlib图中获取鼠标单击的坐标

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

root = tk.Tk()
fig = Figure()

ax = fig.add_subplot(111)

def onclick(event):
    x = event.xdata
    y = event.ydata
    print("鼠标单击坐标：", x, y)

cid = fig.canvas.mpl_connect('button_press_event', onclick)

canvas = FigureCanvasTkAgg(fig, master=root)
canvas.draw()
canvas.get_tk_widget().pack(side=tk.TOP, fill=tk.BOTH, expand=1)

tk.mainloop()