"IndexError: list index out of range" when trying to generate G-Code for imported svg

[croeer]

Hi there, I traced a little picture and opened in inkscape. When trying to generate the g-code i get the following error message:

Traceback (most recent call last):
  File "laserpecker.py", line 1470, in <module>
    e.run()
  File "C:\Users\croeer\Downloads\inkscape\share\inkscape\extensions\inkex\base.py", line 140, in run
    self.save_raw(self.effect())
  File "laserpecker.py", line 1451, in effect
    self.orientation(self.layers[min(0, len(self.layers) - 1)])
  File "laserpecker.py", line 1386, in orientation
    doc_height = self.svg.unittouu(self.document.getroot().xpath('@height', namespaces=inkex.NSS)[0])
IndexError: list index out of range

Example file: toad.zip

I was able to fix it using a deprecated function call in laserpecker.py, so i could generate the g-code, but maybe you can look into it:

        doc_height = self.svg.unittouu(self.getDocumentHeight())

I'm also new to inkscape, so maybe I am doing something else wrong.

[yy502]

Thanks for the sample file and workaround. I'll look into this over the weekend.

[yy502]

Hi there, I did a quick test. Whatever shape/path I created in your svg file will cause this error. If I copy & paste your toad to a new Inkscape doc, it will work fine. So I guess it's something to do with the XML attributes of your svg file.

toad.txt

[croeer]

OK I see the problem: I created the svg file with an app called Vectornator, that has a "responsive" toggle on svg export. If unset, no width/height attributes are written so the svg element, which leads to the index error. If set, height is set to 100%, which then messes with the units, i.e. even if set to mm the extension will still complain about the image being to big, so I have to rescale it to be less than 100x100 px (!) (also, some weird path errors occur, where your comments of ungroup, object to path helped).

I did however find an undeprecated way to get the height: use svg.height:

doc_height = self.svg.unittouu(self.svg.height)

The generated g-code is off by 5x10E-5 mm when compared to the original version. Perhaps this is a fix you could incorporate, so the extension supports responsive svg files not created directly from inkscape.

Thanks for your quick support, the great extension and your overall helpiness on fb.