Bokeh:如何单击并拖动以显示点之间的位移

from bokeh.plotting import figure, show
from bokeh.models import ColumnDataSource
from bokeh.events import Tap, Pan

# 创建数据
x = [1, 2, 3, 4, 5]
y = [1, 2, 3, 4, 5]

# 创建绘图对象
p = figure(plot_width=400, plot_height=400, tools="pan,tap")

# 创建数据源
source = ColumnDataSource(data=dict(x=x, y=y))

# 绘制散点图
p.circle('x', 'y', size=10, source=source)

# 定义回调函数
def callback(event):
    if isinstance(event, Tap):
        # 单击事件
        print("单击事件")
    elif isinstance(event, Pan):
        # 拖动事件
        print("拖动事件")
        # 计算位移
        dx = event.delta_x
        dy = event.delta_y
        # 更新数据源
        source.data['x'] = [x + dx for x in source.data['x']]
        source.data['y'] = [y + dy for y in source.data['y']]

# 添加回调函数
p.on_event(Tap, callback)
p.on_event(Pan, callback)

# 显示图表
show(p)