https://bugs.kde.org/show_bug.cgi?id=476982
Bug ID: 476982
Summary: Can't draw on Wayland: huge parralax and no way to fix
calibration of the stylus on the GUI
Classification: Applications
Product: systemsettings
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: kcm_tablet
Assignee: plasma-b...@kde.org
Reporter: i...@davidrevoy.com
CC: aleix...@kde.org
Target Milestone: ---
Created attachment 163143
--> https://bugs.kde.org/attachment.cgi?id=163143&action=edit
^ video IRL of the bug
Hi,
I jumped to the Wayland session this morning to evaluate it, and one of my
first show-stopper for making art is the lack of configuration tool for
calibrating the stylus.
I have a big offset between the tip of my stylus and the cursor position due to
not having any possibilities to fix the parralax (see short MP4 video in
attachement, no audio, only 13 seconds).
On X11, I could use the kcm_tablet plugin to perform a calibration, or use
xinput-calibrator ( https://github.com/tias/xinput_calibrator ) to get the four
coordinate and apply them with something like `xsetwacom set "UGTABLET Artist
Pro 16 (Gen2) stylus" Area 125 45 32810 32792` and fix the parralax.
This issue is important if you want to maintain https://kde.org/for/creators/
compatible with the Wayland session, because I don't know any artists/graphists
able to design, draw or paint on a display tablet without parralax correction
...
Here are steps of what I'm used to see on the user experience side, for
references in case you don't know how other products solved it:
1. Map the tablet to a monitor (Important: many 'display pen tablet' after
being connected transform the desktop into a multi-monitor setup [1] [2] and
after that the stylus enter a mapping accross all monitors. It must be
restricted to a single monitor before starting a calibration).
2. User usually click on a 'calibrate' button in the system settings/tablet
GUI.
3. The display fills with a unified color (or a grid), and shows:
- Four 'targets' to click on their center, they look like a crosses, it
must be precise. They usually appears step by step on the four corners.
- A button to cancel calibration (Escape key on keyboard also cancel it). I
also met the case with a 'timer' so the calibration cancel automatically if the
four targets are not clicked within a time period. I'm not fan of it, because
it put pressure on user to perform the calibration in a given time.
- Sometime a button to restore default ( 0 calibration ).
(see [3] [4] [5] )
Once calibration is done, these set of coordinate must also be applied to the
"eraser" tip of the same stylus, because it is often a separate device
requiring also the same parallax.
That's all, thank you for the work on Wayland!
Note: with Fedora 40 KDE Wayland only in the horyzon, I cross finger I'll can
continue to use GNU/Linux for making my webcomic Pepper&Carrot. Being forced to
become in exile for finding a distro with X11 just to configure my tablet or
getting back to Windows because of Wayland would be so frustrating and
devastating for my efforts of 100% FLOSS workflow over the last 14 years.
[1] https://www.davidrevoy.com/article993/review-of-a-new-tablet-soon
[2] https://www.davidrevoy.com/article999/current-workspace-setup
[3]
https://s3.amazonaws.com/cdn.freshdesk.com/data/helpdesk/attachments/production/2043260534312/original/9V8rRXmG0w7bjlgA3UhpQreS0exVisLWqw.png?1632393352
[4]
https://lh4.googleusercontent.com/-pVSVTIEy9lA/VNBYzOK5hnI/AAAAAAAA3FM/Jdrk6lCMrww/w490/Calibration%2B2.jpg
[5]
https://storyart.education/wp-content/uploads/2016/08/Screen-Shot-2016-08-17-at-8.52.01-AM.png
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