如何使用OHLC图表在Matplotlib上添加一个滑块选择器？

import matplotlib.pyplot as plt
from matplotlib.widgets import Slider
import numpy as np

# 生成示例数据
np.random.seed(0)
n = 100
dates = np.arange(n)
open_prices = np.random.rand(n) * 100
high_prices = open_prices + np.random.rand(n) * 10
low_prices = open_prices - np.random.rand(n) * 10
close_prices = (high_prices + low_prices) / 2

# 创建图形和轴
fig, ax = plt.subplots()
plt.subplots_adjust(bottom=0.25)

# 绘制初始OHLC图表
lines = ax.plot(dates, open_prices, 'g--', dates, high_prices, 'r--', dates, low_prices, 'b--', dates, close_prices, 'k-')

# 设置轴标签
ax.set_xlabel('Date')
ax.set_ylabel('Price')

# 创建滑块
ax_slider = plt.axes([0.25, 0.1, 0.65, 0.03])
slider = Slider(ax_slider, 'Date', 0, n-1, valinit=0, valstep=1)

# 更新函数
def update(val):
    idx = int(slider.val)
    ax.set_xlim(0, idx)
    fig.canvas.draw_idle()

slider.on_changed(update)

plt.show()