[okular] [Bug 437401] Jagged freehand annotations

[ramon diaz-uriarte]

https://bugs.kde.org/show_bug.cgi?id=437401

ramon diaz-uriarte <rdiaz02 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REPORTED                    |RESOLVED
         Resolution|---                         |NOT A BUG

--- Comment #8 from ramon diaz-uriarte <rdiaz02 at gmail.com> ---
Thanks. I haven't been able to test with another stylus, but things are OK
(much smoother) with the mouse, so I guess this is a stylus issue as you
suggested.

I guess we can close this, so I am setting status to "resolved", "not a bug".
Apologies for the noise with this report.


(In reply to David Hurka from comment #7)
> Thanks. I don’t think these screenshots indicate a systematic jitter, but
> just the natural jitter of a physical object.
> 
> After reading this more carefully:
> 
> > - That same annotation, displayed in another PDF viewer, does not
> >   look as jagged, but it is more jagged than annotations done
> >   with other apps (e.g., Xodo or Adobe Acrobat Reader DC).
> 
> I think that Poppler (Okular’s backend) renders the annotation with
> miter-join line style, while other renderers use round-join. Round-join can
> not make spikes.
> 
> >   but it is more jagged than annotations done
> >   with other apps (e.g., Xodo or Adobe Acrobat Reader DC).
> 
> Other apps maybe ignore points that are very close to each other, which
> additionally reduces jitter.
> 
> You can test that by slowly drawing a diagonal line with the mouse. My
> Okular creates a staircase line instead of one smooth diagonal line, which
> means that all points of my mouse movement are included. (One pixel up, one
> pixel right, one pixel up, ...)

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