Violin plot

using Deneb

data = Data(url="https://vega.github.io/vega-datasets/data/cars.json")

chart = data * Mark(:area, orient=:horizontal) * transform_density(
    :Miles_per_Gallon,
    as=[:Miles_per_Gallon, :density],
    extent=[5, 50],
    groupby=:Origin,
) * Encoding(
    x=field(
        "density:Q",
        stack=:center,
        axis=(labels=false, values=[0], grid=false, ticks=true),
        impute=nothing,
        title=nothing,
    ),
    y="Miles_per_Gallon:Q",
    color="Origin:N",
    column=field(
        "Origin:N",
        spacing=0,
        header=(titleOrient=:bottom, labelOrient=:bottom, labelPadding=0),
    )
) * vlspec(width=100) * config(:view, stroke="")

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