Effects - Modify Path - Flatten Beziers fails on complicated paths with small flatness parameter

Confirmed on Vista sp1, Inkscape rev. 21852 and 0.46.
Reproduced with parameter value of 2.
Attached is the complete log message.

Apparently affects export to HPGL too:
Bug #487052 “HPGL Output crashes ”
Bug #717767 “hpgl export crashes, file remains empty”

attached is a modified version of the file cspsubdiv.py, which avoids the crash.

in order to implement this, you will need to copy the file cspsubdiv.py into the directory \Inkscape\share\extensions\ to replace the file that is there. you may want to make a backup of the original file, just in case.

as usual, any feedback would be welcome...

I can confirm that this fix works. I was not able to generate a path that
the Flatten Beziers tool failed on.

On Wed, Mar 2, 2011 at 4:27 AM, Alvin Penner <email address hidden> wrote:

> ** Changed in: inkscape
> Status: Confirmed => Incomplete
>
> --
> You received this bug notification because you are a direct subscriber
> of the bug.
> https://bugs.launchpad.net/bugs/340123
>
> Title:
> Effects - Modify Path - Flatten Beziers fails on complicated paths
> with small flatness parameter
>
> Status in Inkscape: A Vector Drawing Tool:
> Incomplete
>
> Bug description:
> Reproduction Steps:
> 1)Generate a long, highly detailed curve with the freehand curve tool (a
> scribble is the best way to reproduce the bug)
> 2)Select the curve
> 3)Select the "Flatten Beziers" effect from the "Effects - Modify Path"
> menu
> 4)Use a small flatness value (around 2 consistently produces the bug)
> 5)Observe the failure of the effect
>
> A sample .svg file containing a curve that consistently produces a
> failure with a flatness parameter of "2" is included.
>
> The python traceback ultimately reports:
> " File "C:\Program Files\Inkscape\share\extensions\ffgeom.py", line 66,
> in delta_x
>
> return self[1]['x'] - self[0]['x']
>
> RuntimeError: maximum recursion depth exceeded"
>
> A version of this effect that works on curves of arbitrary length and
> detail would be very valuable for those wishing to use Inkscape as a
> level design tool for games. It greatly simplifies the process of
> generating a triangle mesh from a closed path. However, in its
> current form artists have a difficult time predicting how long or
> detailed the curves they generate can be before the path will produce
> a failure.
>
> To unsubscribe from this bug, go to:
> https://bugs.launchpad.net/inkscape/+bug/340123/+subscribe
>

good to hear, committed to bzr rev 10076

Fix copied to stable in 9863