PS: Here is a website with a description that does not rely on unfree
    platforms: https://misohena.jp/blog/2021-09-21-emacs-easy-draw.html

The clearest description is a gif, though:
https://misohena.jp/blog/wp-content/uploads/2021-09-21-edraw-example.gif

Richard Stallman <rms@gnu.org> writes:
>   > - draw in emacs: https://github.com/misohena/el-easydraw
>
> Is this a useful package that would be nice to have in ELPA?


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