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  1. Qt
  2. QTBUG-45375

Jittery lines with Wacom tablet and QTabletEvent

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Details

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

    Description

      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.

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        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-36937 Windows: QTabletEvent hiResGlobalX() hiResGlobalY() returns int precision values (nothing after decimal point)

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-48151 Jittery tablet input in Linux does not respond to RawSampleRate

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          relates to

          Suggestion - Public suggestions QTBUG-45378 Dodgy arithmetic in fixed1616ToReal()

          • P3: Somewhat important - Should be fixed, but doesn't affect the release in any way.
          • Closed
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              srutledg Shawn Rutledge
              danielsabo Daniel Sabo
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              Dates

                Created:
                Updated:
                Resolved:

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