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About

  • Map Wacom tablet to primary screen (xrandr | grep primary, xsetwacom ... MapToOutput ...)
  • Adjust Wacom active area to screen aspect ratio.
  • For now only stylus area aspect ratio (e.g. 16/10 = 1.6) <= screen aspect ratio (e.g. 16/9 = 1.777...) supported.
  • We hard-coded some custom settings for our Wacom model (end of the script). Deactivate if needed. See also #1

Usage

Connect the device, then just run wacomsetup.

$ /path/to/wacomsetup/wacomsetup
map to screen: DP-1-1
screen: 0 0 3840 2160 | aspect=1.778
stylus: 0 0 31920 19950 | aspect=1.6 -> 0 0 31920 17955 | aspect=1.778

Requirements

  • xsetwacom (Debian: xserver-xorg-input-wacom)
  • Python3

X11 frame geo

We assume W1xH1+W0+H0 (example 3840x2160+0+0) with +w0+h0 = +0+0, where + means upper left (w0, h0).

(w0, h0)
(0,  0)     w
     +--------------+
     |              |
     |              | h
     |              |
     +--------------+
                    (w1, h1)
                    (3840, 2160)

There is also the syntax -w0-h0 which means w1 and h1 are relative to lower right (w0,h0).

We usually have this setup (from xrandr):

DP1-1 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 600mm x 340mm
eDP1 connected 1920x1080+3840+0 (normal left inverted right x axis y axis) 310mm x 170mm

or

DP-1-1 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 600mm x 340mm
eDP-1 connected (normal left inverted right x axis y axis)

which is a 4K screen (DP1-1) left of a 1080p laptop (eDP1):

DP1-1 eDP1

i.e.

xrandr --output eDP1 --mode 1920x1080 --pos 3840x0 --rotate normal
       --output DP1-1 --primary --mode 3840x2160 --pos 0x0 --rotate normal

which is set by arandr. Not tested if --right-of creates the same geo 1920x1080+3840+0 as --pos 3840x0 does.

We ignore w0,h0 != 0,0 which is the case in multi monitor setups as just shown (1920x1080+3840+0 instead of 1920x1080+0+0). This is irrelevant for aspect correction, since we use MapToOutput to map the stylus area to a screen instead of using absolute coordinates. Should work in any kind of monitor setup (untested).

Adjust aspect ratio

Currently we only support stylus area aspect ratio (e.g. 16/10 = 1.6) <= screen aspect ratio (e.g. 16/9 = 1.777...). In this case we adjust the stylus active area by removing some pixels at the bottom of the active area where we don't draw often anyway:

+--------------+       +--------------+
| 16/10 = 1.6  |  -->  | 16/9 = 1.777 |
| stylus orig  |       | stylus new   |
| area         |       +--------------+
+--------------+

In the other case, we'd need to keep the height but remove a strip of pixels from the left and/or right of the active area. This can be easily added but we don't have that use case. For now we throw an exception in that case. PRs welcome!

+--------------+
| 16/10 = 1.6  |
|              |
|              |
+--------------+

      |
      |
      v

 +----------+
 | 4/3      |
 | = 1.333  |
 |          |
 +----------+

Wacom frame geo

w0 h0 w1 h1

example:

$ xsetwacom get "Wacom Intuos Pro S Pen stylus" Area
0 0 31920 19950

Wacom Button mapping (Intuos Pro S, 2020 model)

See

From

/usr/share/libwacom/intuos-pro-s.tablet
/usr/share/libwacom/layouts/intuos-pro-s.svg

we find

2 B
3 C
4 D
1 A (buttom middle wheel)
5 E
6 F
7 G

but that's wrong. On our device B=1,C=2,.... Bummer.

Drawing apps

We mostly use the excellent xournalpp or even the older xournal which still works great. Both available in Debian repos as well.