Inkscape might be a good reference for an app that uses e.g. pen pressure.
I use Gimp on a mac with the Wacom Cintiq and it works fine. If it's broken, I'm not aware of it.

But we already have an example of Mac <-> FLTK <-> Cintiq in STR#3329. What's needed is Win and Linux.
I'm pretty sure Linux probably uses the same stuff SGI did back in the day, as X input extensions, IIRC.

I wrote some pure X windows/OpenGL code very long ago (1998) on an SGI using X input extensions to read pen pressure and tilt from a Wacom Artz tablet, code for that is here: http://seriss.com/people/erco/wacom/

Since Linux inherited a lot from SGI regarding X and graphics, I wouldn't be surprised if the same/similar techniques still work 23 years later, lol. It's just never been dragged into FLTK because at the time the specs were still in a state of formation. I think Matthias took that code and tried to integrate it into FLTK, maybe FLTK2.

Perhaps we should first look to FLTK2 to see if this has already been done. I think most of the current FLTK 1.x devs are completely unaware of what's in FLTK2.

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