Simple Stacked Area Chart

This example shows how to make a simple stacked area chart.

Method syntax

import altair as alt
from vega_datasets import data

source = data.iowa_electricity()

alt.Chart(source).mark_area().encode(
    x="year:T",
    y="net_generation:Q",
    color="source:N"
)

Attribute syntax

import altair as alt
from vega_datasets import data

source = data.iowa_electricity()

alt.Chart(source).mark_area().encode(
    x="year:T",
    y="net_generation:Q",
    color="source:N"
)
# No channel encoding options are specified in this chart
# so the code is the same as for the method-based syntax.