插图:在on_click事件上更改散点图中的标记文本

import matplotlib.pyplot as plt

# 创建散点图
fig, ax = plt.subplots()
scatter = ax.scatter([1, 2, 3, 4, 5], [1, 4, 9, 16, 25])

# 定义on_click事件处理函数
def on_click(event):
    if event.inaxes == ax:
        # 获取点击事件的坐标位置
        x, y = event.xdata, event.ydata

        # 计算最近的散点
        distances = [(x - xi) ** 2 + (y - yi) ** 2 for xi, yi in zip(scatter.get_offsets()[:, 0], scatter.get_offsets()[:, 1])]
        nearest_index = min(range(len(distances)), key=distances.__getitem__)
        nearest_point = scatter.get_offsets()[nearest_index]

        # 获取散点的数据
        x_value, y_value = nearest_point

        # 更改标记文本的内容
        new_label = f'({x_value}, {y_value})'

        # 更新散点图中该散点的标记文本
        scatter.get_children()[nearest_index].set_text(new_label)

        # 重新绘制图表
        fig.canvas.draw()

# 绑定on_click事件
fig.canvas.mpl_connect('button_press_event', on_click)

# 显示图表
plt.show()