填充阶梯图

此示例展示了 Google 随时间变化的股价，显示为一个填充区域并突出线条的阶梯图。

方法语法

import altair as alt
from vega_datasets import data

source = data.stocks()

alt.Chart(source).mark_area(
    color="lightblue",
    interpolate='step-after',
    line=True
).encode(
    x='date',
    y='price'
).transform_filter(alt.datum.symbol == 'GOOG')

属性语法

import altair as alt
from vega_datasets import data

source = data.stocks()

alt.Chart(source).mark_area(
    color="lightblue",
    interpolate='step-after',
    line=True
).encode(
    x='date',
    y='price'
).transform_filter(alt.datum.symbol == 'GOOG')
# No channel encoding options are specified in this chart
# so the code is the same as for the method-based syntax.