如何使用matplotlib for BrokenBarHCollection对象在子图上创建悬停注释？

import matplotlib.pyplot as plt
from matplotlib.collections import BrokenBarHCollection

fig, ax = plt.subplots()

bars = [(1, 2), (3, 4), (6, 3)]  # 示例数据，表示三个矩形的起始和结束位置

collection = BrokenBarHCollection(bars, (0, 1), facecolors='blue', alpha=0.6)  
# bars为矩形的起始和结束位置，(0, 1)表示矩形的高度范围，facecolors为矩形的颜色，alpha为透明度

ax.add_collection(collection)

ax.set_xlim(0, 10)  # 设置x轴范围
ax.set_ylim(0, 1)  # 设置y轴范围

# 创建悬停注释
annot = ax.annotate("", xy=(0, 0), xytext=(20, 20),
                    textcoords="offset points",
                    bbox=dict(boxstyle="round", fc="w"),
                    arrowprops=dict(arrowstyle="->"))
annot.set_visible(False)  # 初始隐藏注释

# 定义悬停事件处理函数
def hover(event):
    vis = annot.get_visible()
    if event.inaxes == ax:
        for rect in collection.get_segments():
            if rect[0][0] <= event.xdata <= rect[1][0]:
                annot.set_visible(True)
                annot.set_text(f"Value: {rect[0][0]} - {rect[1][0]}")  # 设置注释内容
                annot.xy = (event.xdata, rect[0][1])
                fig.canvas.draw_idle()
                return
    if vis:
        annot.set_visible(False)
        fig.canvas.draw_idle()

# 绑定悬停事件处理函数
fig.canvas.mpl_connect("motion_notify_event", hover)

# 显示图形
plt.show()