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.venv/Lib/site-packages/altair/examples/selection_histogram.py

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+"""
+Selection Histogram
+===================
+This chart shows an example of using an interval selection to filter the
+contents of an attached histogram, allowing the user to see the proportion
+of items in each category within the selection.
+"""
+# category: interactive charts
+import altair as alt
+from vega_datasets import data
+
+source = data.cars()
+
+brush = alt.selection(type='interval')
+
+points = alt.Chart(source).mark_point().encode(
+    x='Horsepower:Q',
+    y='Miles_per_Gallon:Q',
+    color=alt.condition(brush, 'Origin:N', alt.value('lightgray'))
+).add_selection(
+    brush
+)
+
+bars = alt.Chart(source).mark_bar().encode(
+    y='Origin:N',
+    color='Origin:N',
+    x='count(Origin):Q'
+).transform_filter(
+    brush
+)
+
+points & bars