I have a simple plot withe the color scheme dark2
import altair as alt
from vega_datasets import data
source = data.cars.url
alt.Chart(source).mark_circle(size=60).encode(
x='Horsepower:Q',
y='Miles_per_Gallon:Q',
color='Origin:N',
).configure_range(
category={'scheme': 'dark2'}
)
I'd like to add a dropdown selector that allows the user to switch between dark2 and accent. I've tried a variety of different approaches but nothing seems to be correct. Any help is greatly appreciated.
Was able to figure out the solution by using the approach below
import altair as alt
from vega_datasets import data
cars = data.cars()
input_dropdown = alt.binding_select(options=['accent','dark2'], name='Color Scheme')
param = alt.Parameter(name="schemeselect", value = "accent", bind = input_dropdown)
alt.Chart(cars,params = [param]).mark_circle(size=60).encode(
x='Horsepower:Q',
y='Miles_per_Gallon:Q',
color=alt.Color('Origin', scale=alt.Scale(scheme={"expr": "schemeselect"})),
)
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