Error message when applying perspective effect

[Frederik Elwert]

When I use the perspective effect (Effects → Modify path →
Perspective), I get an error message about failure of format autodetecting.
The error seems to have no influence on the result, because the effect
works.

Here is the message:

** (inkscape:22493): WARNING **: Format autodetect failed. The file is
being opened as SVG.

** (inkscape:22494): WARNING **: Format autodetect failed. The file is
being opened as SVG.

** (inkscape:22495): WARNING **: Format autodetect failed. The file is
being opened as SVG.

** (inkscape:22496): WARNING **: Format autodetect failed. The file is
being opened as SVG.

[Aaron C Spike (acspike)]

Originator: NO

This is of course a "warning" message rather than an "error" message and
therefore is not critical to the function of the script. :-)

I've made a value judgment and masked this warning in current svn by
discarding stderr that this script receives from its nested calls to
inkscape. This means that we may mask real problems, but I assume they will
be few and it will certainly create fewer bug reports than the warning has.

[Kattekrab (donna)]

Just tried to use the perspective tool
"Inkscape has received additional data from the script executed. The script did not return an error, but this may indicate the results will not be as expected." This bug is marked as 'fix released' but is returning an error - and is not producing the perspective effect as a result... full error message pasted below.

[Kattekrab (donna)]

Traceback (most recent call last):
  File "/usr/share/inkscape/extensions/perspective.py", line 133, in <module>
    e.affect()
  File "/usr/share/inkscape/extensions/inkex.py", line 172, in affect
    self.effect()
  File "/usr/share/inkscape/extensions/perspective.py", line 85, in effect
    solmatrix[i][0] = sp[i][0]
UnboundLocalError: local variable 'sp' referenced before assignment

[prkos (prkos)]

Kattekrab what OS and Inkscape version are you using?

I'm on linux and build 20254 and perspective works ok.

[Kattekrab (donna)]

On Sun, 2008-11-30 at 11:12 +0000, prkos wrote:
> Kattekrab what OS and Inkscape version are you using?

Ubuntu 8.10
SVN 20214

> I'm on linux and build 20254 and perspective works ok.

Thanks! I'll build a new one tonight and see if it's fixed.

- Donna

--
Donna Benjamin - Executive Director
creative contingencies pty ltd - http://www.cc.com.au/
when plan a fails and there's no plan b, plan cc
open source - facilitation - web services

[Aaron C Spike (acspike)]

Please attach the file with instructions to reproduce. sp is defined conditionally and it may be an issue with your selection. Also please add the output of `which inkscape` and verify that this is the inkscape you are currently running.

[Kattekrab (donna)]

D'oh! It works if you select the text first, then the bezier path... would it be possible for inkscape to say that instead of the python traceback?

EG: "To use the perspective effect, select the item you wish to modify first, then the perspective path it should follow"?

or something like that :)

Inkscape Version:
-----------------------
Format: 1.8
Date: Sun, 30 Nov 2008 23:13:18 +1100
Source: inkscape
Binary: inkscape
Architecture: source i386
Version: 0.46.0-1cafuego1+svn-20286
Distribution: intrepid

Steps to Reproduce:
-------------------------
1. create text
2. convert text to path
3. create box with bezier
4. select path, shift select text
4. select Effects -> Modify Path -> Perspective

Error/Warning returned:
------------------------------
Traceback (most recent call last):
  File "/usr/share/inkscape/extensions/perspective.py", line 133, in <module>
    e.affect()
  File "/usr/share/inkscape/extensions/inkex.py", line 172, in affect self.effect() File "/usr/share/inkscape/extensions/perspective.py", line 85, in effect solmatrix[i][0] = sp[i][0]UnboundLocalError: local variable 'sp' referenced before assignment

[prkos (prkos)]

Requests have already been made to make the effects and all other tricky functions more user friendly.

[Aaron C Spike (acspike)]

Rather than closing this, can we make it a feature request? I think I can't do that because I'm not on the bug team.

[prkos (prkos)]

Do you think this covers it: bug 186582?

Have you applied to be on the team? I'm sure you'll be approved right away.

[Kattekrab (donna)]

https://bugs.launchpad.net/inkscape/+bug/186582

yep - that mostly covers it... except for the order of selection issue.

have left a comment there too.

[Kattekrab (donna)]

There is still an issue here - and does not seem to have been adequately resolved.

[Kattekrab (donna)]

Alvin Penner submitted a patch that goes along way toward resolving this issue - but the selection order is still unresolved.

see: https://bugs.launchpad.net/inkscape/+bug/186582

[Alvin Penner (apenner)]

I believe the original error message has been avoided. If there are no objections, I'm going to mark this as Fix Released.
If there are still unresolved issues, perhaps a new bug could be raised.

[rogkmyers (rogkmyers)]

Im using mac OS X 10.5.8. When I run the Perspective script I get the following error message.

Traceback (most recent call last):
  File "Contents/Resources/extensions/perspective.py", line 158, in <module>
    e.affect()
  File "/Applications/Inkscape.app/Contents/Resources/extensions/inkex.py", line 198, in affect
    self.effect()
  File "Contents/Resources/extensions/perspective.py", line 89, in effect
    q[query] = float(p.stdout.read())
ValueError: invalid literal for float(): Warning: AppleCollationOrder setting not found, using AppleLocale.
Setting Language: .UTF-8
574.71933

[Alvin Penner (apenner)]

- which version of Inkscape? the source code for the perspective effect was modified in Dec 2008.
- could you attach the svg file which is causing the problem?

[su_v (suv-lp)]

Confirmed with the latest Inkscape 0.47pre2-2 from sf.net on OS X 10.5.8

works fine with my local r22200 build (using modified launch scripts and local MacPorts python 2.6 including all necessary site-packages installed with MacPorts)

Seems to be an issue with the packaging of inkscape and python modules for osx -> better to file a separate report?

[su_v (suv-lp)]

works fine with Inkscape 0.47pre1-2 from sf.net on OS X 10.5.8

i.e. could be related to no longer setting DYLD_LIBRARY_PATH for inkscape-bin and its shared libraries?

[su_v (suv-lp)]

or due to 'echo' output in Contents/Resources/bin/inkscape (committed in SVN revision 21865 <http://inkscape.svn.sourceforge.net/viewvc/inkscape?view=rev&revision=21865> )

[su_v (suv-lp)]

Redirecting the echo stdout to stderr in the launcher script 'packaging/macosx/Resources/bin/inkscape' fixes this particular python extension failure with Inkscape 0.47pre2-2 on OS X 10.5.8

[Michael Wybrow (mjwybrow)]

The Mac fix for this is included in Inkscape-0.47pre2-3.LEOPARD+.dmg