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