带描边点标记的折线图

此示例显示了一个简单的折线图，其中的点标记颜色不同。

方法语法

import altair as alt
from vega_datasets import data

source = data.stocks()

alt.Chart(source).mark_line(
    point=alt.OverlayMarkDef(filled=False, fill="white")
).encode(
    x='date:T',
    y='price:Q',
    color='symbol:N'
)

属性语法

import altair as alt
from vega_datasets import data

source = data.stocks()

alt.Chart(source).mark_line(
    point=alt.OverlayMarkDef(filled=False, fill="white")
).encode(
    x='date:T',
    y='price:Q',
    color='symbol:N'
)
# No channel encoding options are specified in this chart
# so the code is the same as for the method-based syntax.