Maybe the end of “How do I do a moving line on a map?”

[David Smith]

There’s also the Trail FCP plug-in, part of the Clone and Paint Collection ($49) from CHV:
https://www.chv-plugins.com/cms/Fx-Script/CloneAndPaint-collection/Trail.php

[David Roth weiss]

Good finds, both of you. Unfortunately both apps seems to only allow straight line, no splines or curves, but better than nothing by a long shot.

DRW

[Zak Mussig]

I’m a big fan of this method…

https://www.motionsmarts.com/tutorials/drawinglines/drawinglines1.html

Uses Motion instead of FCP, but I’m a big fan of the results.

Zak

[Rennie Klymyk]

Thanks everyone! I just told my client a few hours ago “not going to happen” for a job we want to wrap tomorrow. She will be surprised in the morning!