堆叠条形图

这是一个堆叠条形图的示例，使用的数据包含了1930年代不同地区和不同年份的作物产量。

Method syntax

import altair as alt
from vega_datasets import data

source = data.barley()

alt.Chart(source).mark_bar().encode(
    x='variety',
    y='sum(yield)',
    color='site'
)

Attribute syntax

import altair as alt
from vega_datasets import data

source = data.barley()

alt.Chart(source).mark_bar().encode(
    x='variety',
    y='sum(yield)',
    color='site'
)
# No channel encoding options are specified in this chart
# so the code is the same as for the method-based syntax.