I have an arbitrary graph and want to draw an envelope around/behind a certain subset of the graphs nodes. To clarify what I want to achieve, I have made a sketch in Inkscape:

Envelope example

Any ideas how to realize something like that?


1 Answer 1


Okay, the suggestions of posts related to my question brought me on the right track: Highlight a group of nodes in a tikz tree

One has to exchange expressions of the form \atan2(x, y) with \atan2(y, x) to get it working correctly.

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