CODEWITHSUNDEEP
pythonimagefacetaltair
Zac Connolly
Zac Connolly

Reputation: 63

Altair facet charts save individual image

How to split Altair .facet chart into individual images with option to save each one.

is it possible to save individual images when using .facet?

provided basic example of .facet chart with image save option for whole group. enter image description here

(Screenshot from https://altair-viz.github.io/user_guide/compound_charts.html#faceted-charts)

Upvotes: 1

Views: 206

Answers (1)

jakevdp
jakevdp

Reputation: 86523

You can only save full charts; there is no mechanism to individually save subpanels of a single chart.

As a workaround, you can re-create these subpanels as single charts. Here is one possible approach using a conditional opacity:

import altair as alt
from vega_datasets import data
iris = data.iris()

chart = alt.Chart(iris).mark_point().encode(
    x='petalLength:Q',
    y='petalWidth:Q',
    color='species:N'
).properties(
    width=160,
    height=160
)

for species in ['setosa', 'versicolor', 'virginica']:
    chart.encode(
        opacity=alt.condition(
            f"datum.species == '{species}'", alt.value(1), alt.value(0)
        )
    ).display()

enter image description here

enter image description here

enter image description here

Upvotes: 2

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