Yes, we should add this, but no one's been able to come up with this cross platform as yet.

Back in 2016 I proposed a Mac specific patch in STR#3329 to support pen movement + pressure/tilt that worked for me on a Cintiq (Wacom monitor/tablet combo used for drawing), see:

[1] https://www.fltk.org/newsgroups.php?gfltk.general+v:40003
[2] https://www.fltk.org/str.php?L3329

But that's as far as I got.

I was not sure what the proper API should be, and sought input, but since none was offered, the STR has languished.
Could be revived though, we just need a way that (a) works for cross platform, (b) does not impact performance on non-tablet devices (since this causes a lot of excess event traffic, or at least in my case it certainly did).

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