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"""
Becker's Barley Trellis Plot (Wrapped Facet)
--------------------------------------------
The example demonstrates the trellis charts created by Richard Becker, William Cleveland and others in the 1990s.
This is the Altair replicate of `the VegaLite version <https://vega.github.io/vega-lite/docs/facet.html#facet-full>`_
demonstrating the usage of `columns` argument to create wrapped facet.
"""
# category: advanced calculations
import altair as alt
from vega_datasets import data
source = data.barley.url
alt.Chart(source).mark_point().encode(
alt.X('median(yield):Q').scale(zero=False),
y='variety:O',
color='year:N',
facet=alt.Facet('site:O', columns=2),
).properties(
width=200,
height=100,
)
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