如何在Matplotlib饼图周围绘制箭头以将每个标签指向圆中各自的部分？

import matplotlib.pyplot as plt

# 饼图数据
labels = ['A', 'B', 'C', 'D']
sizes = [15, 30, 45, 10]

# 绘制饼图
fig, ax = plt.subplots()
ax.pie(sizes, labels=labels, autopct='%1.1f%%')

# 获取饼图的中心坐标和半径
center = ax.pie()[0][0].center
radius = ax.pie()[0][0].r

# 绘制箭头和文本标签
for label, size in zip(labels, sizes):
    angle = (size / sum(sizes)) * 360  # 计算每个部分的角度
    x = center[0] + radius * 0.8 * (angle/360)  # 计算箭头的x坐标
    y = center[1] + radius * 0.8 * (angle/360)  # 计算箭头的y坐标
    ax.annotate(label, (x, y), xytext=(x, y), arrowprops=dict(arrowstyle='->'))

# 显示图形
plt.show()