conditional formatting mark_text based on variable?

[parodayco]

I've read the docs on conditions based on interactions but I didn't find a way to format chart text based on conditions. Here's a particularly egregious example where I would like mark_text(align="left", dx=20) for seller_status up to 50%, over 50% mark_text(align="right", dx=-20). I'd appreciate any ideas you have.

[jakevdp]

No, unfortunately the only thing that can depend on conditions are encodings, not mark properties. I know the Vega-Lite team has been thinking about ways to relax this restriction, so you might inquire there.

[parodayco]

Ok, thanks Jake. I'll bring it up with them. They have an example of conditionally altering text in the first example on https://vega.github.io/vega-lite/docs/text.html and am hoping that's the path to my solution. Have a look and please let me know if that can currently be reproduced with Altair. If not, perhaps I can fork and try to help add the capability.

[jakevdp]

Yes, you can conditionally encode the color, because the color is an encoding channel. You cannot conditionally encode offset, because offset is not (yet) an encoding channel.

[jakevdp]

The relevant issue to add your +1 is here: vega/vega-lite#4703

[parodayco]

Thanks again, Jake! I saw your recommendation and cross-post to the vega issue board.