在高空切换开关点

如何解决在高空切换开关点

我希望能够在下面的图表中打开和关闭点的显示。这2行是第1组和第2组中各点的均值。我认为可以使用interactive来完成此操作，但找不到任何示例。非常感谢您的帮助。

import math
import numpy as np
import pandas as pd
import altair as alt

x = np.arange(0,math.pi,0.1);
y = np.sin(x); 
a,b = -0.2,0.2

summary_df=[]

for i in range(0,2):
    for j in range(0,5):
        rand_y = (b - a)*np.random.rand(len(y)) + a
        df = pd.DataFrame({
            'group': i,'batch': j,'x': x,'y': y+rand_y
        })
        summary_df.append(df)
summary_df = pd.concat(summary_df)

base = alt.Chart(
    summary_df
).properties(
    width=200,height=400
)

mean_selection = alt.selection_multi(fields=['group'],bind='legend')
mean_line = base.mark_line(size=2).encode(
    x=alt.X('x:Q'),y=alt.Y('y:Q',aggregate='mean',axis=alt.Axis(title='y')),color='group:N',opacity=alt.condition(mean_selection,alt.value(1),alt.value(0.2))
).add_selection(
    mean_selection
).interactive()

all_selection = alt.selection_multi(fields=['group'],bind='legend')
all_points = base.mark_square(size=10).encode(
    y=alt.Y('y:Q',x=alt.X('x:Q',),tooltip='batch:N',opacity=alt.condition(all_selection,alt.value(0.2))
).add_selection(
    all_selection
).interactive()


(mean_line+all_points)