Dashed line overlaid with solid line in EPS and on print

Confirmed in Inkscape 48.3.1 and lp:inkscape r11118 on Ubuntu 12.04

I want to extend this bug.
This also affects exporting to .ps files.
Furthermore invisible lines get overlaid by visible ones, or just get drawn.
The attached .svg, generated by the program "bkchem 0.13" shows a text in big brackets.
Exported to ps or eps by Inkscape 0.48.2 r9819 on Ubuntu 11.10 the brackets become rectangular boxes.
In the source drawing the brackets are rectangular boxes with one line being invisible.

Settings for the export were:

PS:
PS Level 3
Text to path: off
ps+latex: off
filter to raster: on
raster DPI: 90
Export is whole drawing: on
Export is whole cancas: on
limit to ID: %empty%

EPS:
eps Level: 3
text to path: on
eps+latex: off
Filter to raster:on
raster DPI: 90
Export is whole drawing: off
Export is whole canvas: on
limit to ID: %empty%

> I want to extend this bug.
> This also affects exporting to .ps files.
> Furthermore invisible lines get overlaid by visible ones, or just get drawn.

The problem with the file "in brackets.svg" is unrelated to the originally reported issue, and occurs due to a bug in cairo 1.10, tracked for Inkscape in
Bug #759154 "Open paths with aligned endpoints are closed in cairo-based exports (PDF/PS/EPS)"

The originally reported issue is AFAICT related to or a duplicate of
 Bug #389451 “undefined filling color leads to grey Export.”
 <https://bugs.launchpad.net/inkscape/+bug/389451>
and affects the rendering of staright dashed lines with an 'Unset' (-> solid black) fill color when viewed in some PS/EPS viewers.

I ran some tests relating to this bug, I hope this is useful:

----------------------------------------------------------------------

Inkscape 0.48.2, r9818, running on Fedora 13, x86_64:
- the dashed lines in the puzzle are overlaid with thin solid lines (i.e. bug reproduced)

----------------------------------------------------------------------

0.48 devel, r11698, running on Windows XP:
- when exporting from the GUI (File->Save As), the resulting EPS file is fine (!)

same version, running in "cmd":
  inkscape --export-eps=test.eps puzzle_b21d32.svg
results in a crash:
-----
** Message: Error: Inkscape encountered an internal error and will close now.

terminate called after throwing an instance of 'Inkscape::Extension::Extension::
param_not_exist'
-----

----------------------------------------------------------------------

compiled 0.48 devel on Fedora 15, i686: checked out latest source with:
bzr branch lp:inkscape
(checked out Sep 29, ~ 21.39 GMT):
- the horizontal dashed lines still have the solid line through them, the vertical dashed lines are OK (!!)

From the terminal: inkscape --export-eps=test.eps puzzle_b21d32.svg
also results in a crash:
-----
terminate called after throwing an instance of 'Inkscape::Extension::Extension::param_not_exist'
-----

The gdb backtrace:

#0 0x00110416 in __kernel_vsyscall ()
#1 0x42cbf26f in raise () from /lib/libc.so.6
#2 0x42cc0ba5 in abort () from /lib/libc.so.6
#3 0x4dd31ead in __gnu_cxx::__verbose_terminate_handler() () from /usr/lib/libstdc++.so.6
#4 0x4dd2fc24 in ?? () from /usr/lib/libstdc++.so.6
#5 0x4dd2fc60 in std::terminate() () from /usr/lib/libstdc++.so.6
#6 0x4dd2fdaf in __cxa_throw () from /usr/lib/libstdc++.so.6
#7 0x081e9710 in Inkscape::Extension::Extension::get_param (this=0x8bfed08, name=0x87a8a3c "areaDrawing") at extension/extension.cpp:405
#8 0x081e9993 in Inkscape::Extension::Extension::set_param_bool (this=0x8bfed08, name=0x87a8a3c "areaDrawing", value=false, doc=0x0, node=0x0) at extension/extension.cpp:525
#9 0x0809dd08 in do_export_ps_pdf (doc=0x9858f60, uri=0x8c0a710 "test.eps", mime=0x87a8b8e "image/x-e-postscript") at main.cpp:1562
#10 0x080a0705 in sp_process_file_list (fl=<optimized out>) at main.cpp:1082
#11 0x080a0d89 in sp_main_console (argc=3, argv=0xbffff9d4) at main.cpp:1211
#12 0x0808803f in main (argc=3, argv=0xbffff9d4) at main.cpp:725

----------------------------------------------------------------------

Patrick Min wrote:
> - when exporting from the GUI (File->Save As), the resulting EPS file is fine (!)
> same version, running in "cmd":
> inkscape --export-eps=test.eps puzzle_b21d32.svg
> results in a crash:

The crash is not related to this report: it is a known recent regression in current trunk and was just fixed yesterday (in r11718):
- Bug #1059132 “--export-pdf crashes with inkscape trunk”
 <https://bugs.launchpad.net/inkscape/+bug/1059132>

~suv wrote:
> The crash is not related to this report: it is a known recent regression in current trunk and was just fixed yesterday > (in r11718):

Thanks, sorry about that.

Just installed: Inkscape 0.48+devel r11721 (Oct 2 2012)

Running
inkscape --export-eps=puzzle_b21d32.eps puzzle_b21d32.svg
then
ps2pdf13 puzzle_b21d32.pdf
now produces the PDF with the vertical dashed lines OK, but
the horizontal ones still with a solid line through it
(visible in acroread, but not in evince)
(evince does show the solid line in the original eps)

Edit of previous comment: of course it should have been:
ps2pdf13 puzzle_b21d32.eps

A hack to get rid of the solid lines:
in the resulting EPS file, remove every line that ends in "l f"

Example:
3.16 515.24 m 60.059 515.24 l f

(of course I may have been lucky in that my file doesn't have
any of these lines that I _do_ need)

Another piece of info that may be useful:
the EPS file generated under Linux (which still has the problem) has as the "creator":
%%Creator: cairo 1.10.2 (http://cairographics.org)

the EPS file generated under Windows from the GUI (which doesn't have the problem):
%%Creator: cairo 1.11.2 (http://cairographics.org)

> (evince does show the solid line in the original eps)

Not reproduced with Inkscape r11721 (used to export the file to EPS) and evince 3.6.0 on Ubuntu 12.10: evince does not render the hairlines at the center of the dashed lines.

> A hack to get rid of the solid lines:
> in the resulting EPS file, remove every line that ends in "l f"

Have you tried to instead remove the fill (currently, it is 'unset') of the dashed lines in the original SVG file, before exporting to EPS?

>> (evince does show the solid line in the original eps)
>
> Not reproduced with Inkscape r11721 (used to export the file to EPS) and evince 3.6.0
> on Ubuntu 12.10: evince does not render the hairlines at the center of the dashed lines.

… nor reproduced with Inkscape trunk r11720 and evince 2.30.3 on OS X 10.7.4 (the dashed lines in the puzzle are not overlaid with thin solid lines). gv (ghostscript 9.05) doesn't show those hairlines (thin solid lines at the center) either - no matter how close I zoom in.

> Have you tried to instead remove the fill (currently, it is 'unset') of the dashed lines in the original SVG file,
> before exporting to EPS?

oh man, that fixed it...

thanks :-)

So to be specific: I added
fill: none;
to the style of the dashed lines.

It works fine now even with older version: Inkscape 0.48.2 r9819 (Sep 11 2012)
(under Fedora 13, creator cairo 1.8.10)

Repro. The only dashed line in the resulting .eps is the one going from SqlMapper to SqlExpression.

Arch Linux 64-bit, KDE Plasma 5
Inkscape 0.92pre1 15073 (GTK3)