阶梯图

此示例展示了谷歌随时间的股价。它使用了“step-after”插值方案。完整的插值选项列表包括 ‘linear’、‘linear-closed’、‘step’、‘step-before’、‘step-after’、‘basis’、‘basis-open’、‘basis-closed’、‘cardinal’、‘cardinal-open’、‘cardinal-closed’、‘bundle’ 和 ‘monotone’。

方法语法

import altair as alt
from vega_datasets import data

source = data.stocks()

alt.Chart(source).mark_line(interpolate='step-after').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_line(interpolate='step-after').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.