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"""
Scatter Plot with Rolling Mean
------------------------------
A scatter plot with a rolling mean overlay. In this example a 30 day window
is used to calculate the mean of the maximum temperature around each date.
"""
# category: scatter plots
import altair as alt
from vega_datasets import data
source = data.seattle_weather()
line = alt.Chart(source).mark_line(
color='red',
size=3
).transform_window(
rolling_mean='mean(temp_max)',
frame=[-15, 15]
).encode(
x='date:T',
y='rolling_mean:Q'
)
points = alt.Chart(source).mark_point().encode(
x='date:T',
y=alt.Y('temp_max:Q',
axis=alt.Axis(title='Max Temp'))
)
points + line
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