CODEWITHSUNDEEP
python-3.xscatter-plotaltair
Lars André
Lars André

Reputation: 23

Specifiy colors for labels in alt.Chart()

Let's say I would like to plot ['foo', 'bar', 'test'] with the respective colors ['blue', 'yellow', 'green']. My suggestion to solve this is as following:

alt.Chart(df, height=600, width=1100).mark_circle(size=100).encode(
        x='x',
        y='y',
        color=alt.Color('title:N', legend=None, scale=alt.Scale(range=['blue', 'yellow', 'green'])),
        tooltip=['sample', 'title']
    ).properties(
        selection=click
    ).interactive()

But this seems to pick the colors in an arbitrary order, and not in an ascending order as I expected. I would like foo to be assigned the blue color and bar should become yellow and so on.

Is it possible to link this (labels and colors) somehow?

Upvotes: 2

Views: 388

Answers (1)

jakevdp
jakevdp

Reputation: 86330

There is some information on this in the docs in the Customizing Colors section. Briefly, if you would like to control which values are assigned to which colors, you can use the domain argument:

scale = alt.Scale(domain=['foo', 'bar', 'test'], range=['blue', 'yellow', 'green'])

Upvotes: 2

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