Oct 23,2019 PM 12:50
XP-Pen Artist Pro 15.6, Windows 10, Inkscape, go to Edit => Input Devices, select XP-Pen stylus, change from "disabled" to either "screen", note checkbox to use pen pressure and tilt sensitivity.
Select calligraphy tool, set width to pressure-based and angle to tilt-based (by clicking the icon to the right of each entry).
Expected behavior: Strokes aligned with pen tilt should be narrow, and cross-strokes should be narrow.
Actual behavior: The opposite, cross-strokes are wide. While this would be the appropriate behavior to simulate shading with a tilted pencil, it's wrong for calligraphy. I'd say "backwards" but actually sideways is a better description, the calligrapphy pen behaves as if rotated 90° from the direction of tilt.
System is virtualbox, driver version is 20190903.
PS: In linux (kernel 5.3), my experience is that tilt works correctly for calligraphy in inkscape, but this is WITHOUT the driver from XP-Pen, as I described here: https://www.xp-pen.com/forum-129.html