33 lines
740 B
Python
33 lines
740 B
Python
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"""
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Selection Histogram
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===================
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This chart shows an example of using an interval selection to filter the
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contents of an attached histogram, allowing the user to see the proportion
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of items in each category within the selection.
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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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points = 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, 'Origin:N', alt.value('lightgray'))
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).add_selection(
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brush
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)
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bars = alt.Chart(source).mark_bar().encode(
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y='Origin:N',
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color='Origin:N',
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x='count(Origin):Q'
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).transform_filter(
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brush
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)
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points & bars
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