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"""
Bar Chart with Highlighted Segment
----------------------------------
This example shows a bar chart that highlights values beyond a threshold.
"""
# category: bar charts
import altair as alt
import pandas as pd
from vega_datasets import data
source = data.wheat()
threshold = pd.DataFrame([{"threshold": 90}])
bars = alt.Chart(source).mark_bar().encode(
x="year:O",
y="wheat:Q",
)
highlight = alt.Chart(source).mark_bar(color="#e45755").encode(
x='year:O',
y='baseline:Q',
y2='wheat:Q'
).transform_filter(
alt.datum.wheat > 90
).transform_calculate("baseline", "90")
rule = alt.Chart(threshold).mark_rule().encode(
y='threshold:Q'
)
(bars + highlight + rule).properties(width=600)
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