[Qgis-developer] Offset curve tool

[Marco Hugentobler]

Hi Denis

In certain cases, geos trunk throws an exception (version 3.2 crashes):

ERROR 1: IllegalArgumentException: RobustDeterminant encountered 
non-finite numbers

I noticed it happens often with lines with dense vertex distributions 
(e.g. segmented curves). Maybe Sandro (strk) knows more about the details?

Regards,
Marco

On 29.02.2012 14:28, Denis Rouzaud wrote:
> Hi Marco,
>
> I noticed a bug and Qgis crashes.
>
> Here is a video http://youtu.be/DBbMg5rO8fU
>
> The geometry of the line I played with is:
>
> LINESTRING(554235.01669295 145547.73137862,554242.99020772 
> 145548.76938867,554245.33776182 145545.30016923,554245.49416371 
> 145544.76210759)
>
> Greetings,
>
> Denis
>
>
> On 02/29/2012 11:11 AM, Marco Hugentobler wrote: Hi all
>
> There is a new editing tool in the master branch.
> The offset curve tool creates parallel shifts of linestrings and 
> polygon rings ( single sided buffers with the geos function 
> GEOSSingleSidedBuffer ). The tool can be applied to the edited layer 
> (the geometries are modified) or also to background layers (creates 
> copies of the lines / rings and adds it to the the edited layer). It 
> is thus ideally suited for the creation of distance line layers.
>
> Let me know about issues, suggestions, comments.
>
> The work was kindly funded by the city of Uster (Switzerland).
>
> Regards,
> Marco
>
>
> On 02/29/2012 11:11 AM, Marco Hugentobler wrote:
>> Hi all
>>
>> There is a new editing tool in the master branch.
>> The offset curve tool creates parallel shifts of linestrings and 
>> polygon rings ( single sided buffers with the geos function 
>> GEOSSingleSidedBuffer ). The tool can be applied to the edited layer 
>> (the geometries are modified) or also to background layers (creates 
>> copies of the lines / rings and adds it to the the edited layer). It 
>> is thus ideally suited for the creation of distance line layers.
>>
>> Let me know about issues, suggestions, comments.
>>
>> The work was kindly funded by the city of Uster (Switzerland).
>>
>> Regards,
>> Marco
>>


-- 
Dr. Marco Hugentobler
Sourcepole -  Linux&  Open Source Solutions
Churerstrasse 22, CH-8808 Pfäffikon SZ, Switzerland
marco.hugentobler at sourcepole.ch http://www.sourcepole.ch
Technical Advisor QGIS Project Steering Committee