Allow specifying category order for legends in stacked bar plots

[alecfwilson]

I'd like to be able to set the order in which the items in color stack. For example, I'd like to make Sun the top value of this plot:

tips = px.data.tips()

fig = px.bar(
    tips,
    x="sex",
    y="total_bill",
    color="day",
    category_orders={
        "day": [
            "Mon",
            "Tue",
            "Wed",
            "Thu",
            "Fri",
            "Sat",
            "Sun"
        ]
    },
)
fig

but it returns:

I thought category_order would handle this, but it does not.

[nicolaskruchten]

Actually I think it does, it’s just that in the dataset it’s spelled “Thur” not “Thu” and the order of the legend is from the bottom of the stack. If you want the order of the legend to go the other way you can add something like .update_layout(legend_traceorder=“reversed”)

[alecfwilson]

Ah, that did solve the example I provided. However, passing a color_discrete_map seems to override it, at least with a different dataset I have been using:

fig = px.bar(
    adf,
    x="x",
    y="y",
    color="color",
    category_orders={
        "y": [
            "a",
            "b",
            "c",
            "d",
            "e",
            "f",
        ]
    },
    barmode="relative",
    opacity=1,
    color_discrete_map={
            "a": "rgb(31,120,180)",
            "b": "rgb(166,206,227)",
            "c": "rgb(51,160,44)",
            "d": "rgb(178,223,138)",
            "e": "rgb(255,127,0)",
            "f": "rgb(253,191,111)",
        },
)
fig

returns