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  1. Qt
  2. QTBUG-45375

Jittery lines with Wacom tablet and QTabletEvent

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    • Icon: Bug Bug
    • Resolution: Done
    • Icon: P4: Low P4: Low
    • 5.5.0
    • 5.4.0
    • QPA: X11/XCB
    • None
    • Ubuntu 15.04 beta, x.org 1.17.1

      The X,Y values in QTabletEvent are very unstable compared to Krita or GTK based programs. This seems to be because both of those use the double precision absolute axis values, while xi2ReportTabletEvent uses the fixed point event values.

      I made a patch to demonstrate/correct the difference, however I haven't pushed it to Gerrit because I'm unclear on what xcbWindow.geometry() actually contains or what handleTabletEvent expects the local point to be. So I have no idea if this will hold up on a high-dpi screen or with multiple monitors.

        1. 0001-Fix-jittery-lines-with-Wacom-tablets.patch
          3 kB
          Daniel Sabo
        2. JitterTest.png
          36 kB
          Daniel Sabo
        For Gerrit Dashboard: QTBUG-45375
        # Subject Branch Project Status CR V
        110334,2 Fix jittery lines with Wacom tablets dev qt/qtbase Status: ABANDONED 0 0
        255382,7 Fix tablet jitter on X11 5.12 qt/qtbase Status: MERGED +2 0

            srutledg Shawn Rutledge
            danielsabo Daniel Sabo
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              Created:
              Updated:
              Resolved:

                There are no open Gerrit changes