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