从 alt.Scheme 获取颜色

Question

Is it possible to get the html colors from a (categorical) scheme?
Or is it possible to directly use one specific color from a scheme, for example if you want to use category10 colors also in titles, marks ...?

Answer 1

Altair doesn't store any information about the content of its color palates; all of this is handled by the renderer (ie the vega-lite.js code).

The raw source for all the vega-lite color schemes is contained in this file: https://github.com/vega/vega/blob/02d79dddb2850a24abfe6a4ebaf8823548709bb5/packages/vega-scale/src/palettes.js#L66

It would in principle be possible to write a Python API around this to extract a particular color code, but I'm not aware that anyone has written that code.