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"""
Interval Selection
==================
This is an example of creating a stacked chart for which the domain of the
top chart can be selected by interacting with the bottom chart.
"""
# category: area charts
import altair as alt
from vega_datasets import data
source = data.sp500.url
brush = alt.selection_interval(encodings=['x'])
base = alt.Chart(source).mark_area().encode(
x = 'date:T',
y = 'price:Q'
).properties(
width=600,
height=200
)
upper = base.encode(
alt.X('date:T', scale=alt.Scale(domain=brush))
)
lower = base.properties(
height=60
).add_params(brush)
upper & lower
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