Bug#822556: librecad: PDF export creates poor quality (non vector?) curves
Francesco Poli (wintermute)
invernomuto at paranoici.org
Mon Apr 25 10:53:57 UTC 2016
Package: librecad
Version: 2.0.9-2
Severity: normal
Hello and thanks for maintaining LibreCAD in Debian!
I noticed that the PDF export function seems to create poor quality
curves.
Please take a look at the attached minimal test case.
File arcs.dxf includes two simple cicular arcs, created with librecad.
If I select Export → Export as PDF from the File menu, I get a file
(arcs.pdf) where the two arcs have poor rendering quality.
The two curves do not seem to be vector lines: they almost seem to
be a raster rendering or, maybe, a polygonal approximation (with
a given number of small sides).
Please compare with file arcs_convertedbyinkscape.pdf which is created
by importing arcs.dxf into inkscape and exporting as PDF from there.
The PDF file produced by inkscape seems to have real (vector) circular
arcs, which are rendered fine at any zoom level by PDF viewers.
Furthermore, the PDF file generated by inkscape is much smaller:
$ ls -l arcs*pdf | cut -b 22-
1198 Apr 25 12:03 arcs_convertedbyinkscape.pdf
10424 Apr 25 11:56 arcs.pdf
I think the PDF export function of librecad should be improved,
in order to get high quality vector PDF files.
Please investigate and/or forward my bug report upstream, as
appropriate.
Thanks for your time!
Bye.
P.S.: I think the attached test case is so trivial that it cannot be
considered copyrighted; hence, no license from me should be required,
in order for anyone to do anything he/she wishes with it. Anyway,
should this turn out to not be true, I hereby release my minimal
test case in the public domain with the CC0 declaration:
https://creativecommons.org/publicdomain/zero/1.0/legalcode.txt
-- System Information:
Debian Release: stretch/sid
APT prefers testing
APT policy: (800, 'testing'), (500, 'unstable')
Architecture: amd64 (x86_64)
Kernel: Linux 4.5.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages librecad depends on:
ii libc6 2.22-7
ii libgcc1 1:5.3.1-14
ii libgl1-mesa-glx [libgl1] 11.1.3-1
ii libmuparser2v5 2.2.3-6
ii libqt5core5a 5.5.1+dfsg-16+b1
ii libqt5gui5 5.5.1+dfsg-16+b1
ii libqt5help5 5.5.1-3
ii libqt5printsupport5 5.5.1+dfsg-16+b1
ii libqt5svg5 5.5.1-2
ii libqt5widgets5 5.5.1+dfsg-16+b1
ii librecad-data 2.0.9-2
ii libstdc++6 5.3.1-14
librecad recommends no packages.
librecad suggests no packages.
-- no debconf information
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EOF
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