File: histogram_heatmap.py

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"""
2D Histogram Heatmap
--------------------
This example shows how to make a heatmap from binned quantitative data.
"""
# category: distributions
import altair as alt
from vega_datasets import data

source = data.movies.url

alt.Chart(source).mark_rect().encode(
    alt.X('IMDB_Rating:Q').bin(maxbins=60),
    alt.Y('Rotten_Tomatoes_Rating:Q').bin(maxbins=40),
    alt.Color('count():Q').scale(scheme='greenblue')
)