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"""
Layered chart with Dual-Axis
----------------------------
This example shows how to create a second independent y axis.
"""
# category: advanced calculations
import altair as alt
from vega_datasets import data
source = data.seattle_weather()
base = alt.Chart(source).encode(
alt.X('month(date):T', axis=alt.Axis(title=None))
)
area = base.mark_area(opacity=0.3, color='#57A44C').encode(
alt.Y('average(temp_max)',
axis=alt.Axis(title='Avg. Temperature (°C)', titleColor='#57A44C')),
alt.Y2('average(temp_min)')
)
line = base.mark_line(stroke='#5276A7', interpolate='monotone').encode(
alt.Y('average(precipitation)',
axis=alt.Axis(title='Precipitation (inches)', titleColor='#5276A7'))
)
alt.layer(area, line).resolve_scale(
y = 'independent'
)
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