使用Tkinter和Matplotlib单击时，如何显示两条不同曲线的y值？

import tkinter as tk
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
import matplotlib.pyplot as plt

def on_click(event):
    if event.inaxes:
        x_point = event.xdata
        y_values = [line.get_ydata()[int(x_point)] for line in lines]
        print(f"y values: {y_values}")

# 创建Tkinter窗口
root = tk.Tk()
root.title("Matplotlib in Tkinter")

# 创建一个Figure对象
fig, ax = plt.subplots()

# 绘制两条曲线
x = range(10)
y1 = [i**2 for i in x]
y2 = [i**3 for i in x]
line1, = ax.plot(x, y1, 'r-', label='y=x^2')
line2, = ax.plot(x, y2, 'b-', label='y=x^3')
lines = [line1, line2]

# 添加图例
ax.legend()

# 创建一个FigureCanvasTkAgg对象
canvas = FigureCanvasTkAgg(fig, master=root)
canvas.draw()
canvas.get_tk_widget().pack(side=tk.TOP, fill=tk.BOTH, expand=1)

# 绑定点击事件
canvas.mpl_connect('button_press_event', on_click)

# 运行Tkinter事件循环
root.mainloop()