How to generate a gradient colored legend after a custom graph in Stata?

[Tiago Pereira]

This post is related to my previous query:

https://www.statalist.org/forums/for...-maps-in-stata

To simplify matters: let's suppose one has a scatter plot as follows:

clear
set obs 10
gene x = _n
gene y = _n
scatter x y, xsize(8) aspect(0.7)

which will look like this:

The idea is to plot on the left-hand side a custom gradient bar. For example:

I haven't figured out something straightforward that generate that gradient colored legend. Does anyone have experience with that? Any suggestions?


All the best,

Tiago