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"""
Interactive Rectangular Brush
=============================
This example shows how to add a simple rectangular brush to a scatter plot.
By clicking and dragging on the plot, you can highlight points within the
range.
"""
# category: interactive charts
import altair as alt
from vega_datasets import data
source = data.cars()
brush = alt.selection_interval()
alt.Chart(source).mark_point().encode(
x='Horsepower:Q',
y='Miles_per_Gallon:Q',
color=alt.condition(brush, 'Cylinders:O', alt.value('grey')),
).add_params(brush)
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