https://bugs.kde.org/show_bug.cgi?id=410723
--- Comment #10 from blackdovahb...@gmail.com --- (In reply to Oliver Sander from comment #9) > Created attachment 122832 [details] > Plot of the points of the spiky path > > I extracted the points of the problematic path from the pdf document, and > plotted them using gnuplot. This gets us one step closer to an explanation: > As can be seen from the attached picture, each point is actually a pair of > points, a small distance apart. Together with a MiterJoin line style this > explains the jaggedness of the resulting path. > > [Currently I simply assume that MiterJoin line drawing is used, but I didn't > check. For a 'normal' set of points on a path you wouldn't see the > difference.] > > So the remaining task is to find out where these double points come from. My > system (which is a bleeding edge Okular on Debian Buster) doesn't produce > them. I am tempted to conjecture that the problem is somewhere in the lower > layers of the tablet input stack, and not in Okular itself. Thank you, Oliver. By the sounds of it, I do think you're correct about the origin of the error. It would make sense why the path would appear jagged and spiky because of the pair of joints. I'm not well-versed in these things and my understanding of it is lacking. So take my opinion with a grain of salt. However, I don't believe that the error is caused by the tablet itself. My drawing pad seems to work fine in other applications that are more geared towards drawing/art (Rene stated that it works fine for him in GIMP). This could happen because it uses a different method for tracking paths or could lead to an inconclusive idea that it is a problem with Okular. I would also like to mention that my drawing pad is of the same brand as Rene's but is a different model. I don't know how relevant that information is. I suppose it's possible that this is a bug that occurs with only Wacom tablets. I don't know how likely that would be. Drawing in Okular before I upgraded from Ubuntu 18.04 to Ubuntu 19.04, I had no issues. The error only came to be after upgrading my OS. This leaves me to believe (though I may be incorrect) that this isn't an issue with the drawing tablets but something else. I would also like to reiterate that this only occurred after upgrading my OS (the same thing happened in Rene's case). I don't know why that is but I do think that it's quite strange and could have something to do with the bug. -- You are receiving this mail because: You are the assignee for the bug.
