Step Chart

This example shows Google’s stock price over time. This uses the “step-after” interpolation scheme. The full list of interpolation options includes ‘linear’, ‘linear-closed’, ‘step’, ‘step-before’, ‘step-after’, ‘basis’, ‘basis-open’, ‘basis-closed’, ‘cardinal’, ‘cardinal-open’, ‘cardinal-closed’, ‘bundle’, and ‘monotone’.

import altair as alt
from altair.expr import datum
from vega_datasets import data

stocks = data.stocks()

alt.Chart(stocks).mark_line(interpolate='step-after').encode(
    x='date',
    y='price'
).transform_filter(
    datum.symbol == 'GOOG'
)