35 lines
806 B
Python
35 lines
806 B
Python
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"""
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Histogram with Responsive Bins
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------------------------------
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This shows an example of a histogram with bins that are responsive to a
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selection domain. Click and drag on the bottom panel to see the bins
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change on the top panel.
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"""
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# category: histograms
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import altair as alt
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from vega_datasets import data
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source = data.flights_5k.url
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brush = alt.selection_interval(encodings=['x'])
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base = alt.Chart(source).transform_calculate(
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time="hours(datum.date) + minutes(datum.date) / 60"
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).mark_bar().encode(
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y='count():Q'
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).properties(
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width=600,
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height=100
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)
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alt.vconcat(
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base.encode(
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alt.X('time:Q',
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bin=alt.Bin(maxbins=30, extent=brush),
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scale=alt.Scale(domain=brush)
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)
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),
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base.encode(
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alt.X('time:Q', bin=alt.Bin(maxbins=30)),
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).add_selection(brush)
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)
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