[Qgis-user] Styling polygon borders: preventing double rendering between polygons

[Jorge Gustavo Rocha]

Thank you for the feedback, Karl and Christoph.

Your work around is valid. It is possible to transform the polygons into
lines and then render them correctly.

It would be nice to have an option to render only once adjacent
polygons, with a a common border.

There is a "Feature request" by Miroslav Umlauf at:
https://github.com/qgis/QGIS/issues/17943

I've added my use case.

Regards,

Jorge

On 11/06/20 12:18, Karl Magnus Jönsson wrote:
> Email Signature
>
> Hi!
> I had a similar problem. I’ve made a view ( in PostGIS) to transform
> the boundaries to lines and remove the duplicate lines. Should be
> doable in virtual layers as well. Quite complicated SQL since I have
> several different types of lines depending on the attributes.
>
>  
>
> *Karl-Magnus Jönsson*
>
>  
>
> *Från:*Qgis-user <qgis-user-bounces at lists.osgeo.org> *För *Christoph Jung
> *Skickat:* den 11 juni 2020 13:11
> *Till:* Jorge Gustavo Rocha <jgr at geomaster.pt>
> *Kopia:* qgis-user at lists.osgeo.org
> *Ämne:* Re: [Qgis-user] Styling polygon borders: preventing double
> rendering between polygons
>
>  
>
> Hi Jorge,
>
>  
>
> If it is just a visual thing, than you could transform your polygons
> to lines and delete the duplicate geometries.
>
>  
>
> Sincerely,
>
> Christoph
>
>
>
>     Am 11.06.2020 um 12:45 schrieb Jorge Gustavo Rocha
>     <jgr at geomaster.pt <mailto:jgr at geomaster.pt>>:
>
>      
>
>     Hi QGisers,
>
>     I'm trying to style a polygon layer (districts) using a marker
>     line (using the '+' sign). It works well for lines.
>
>     When I use it in polygons, the outer line is ok, but the lines
>     between polygons are rendered twice.
>
>     To make this question more clear, I've attached the following
>     print screen:
>     https://nextcloud.geomaster.pt/index.php/s/e3ztdJ894RCf9j6
>
>     The line near the sea is rendered just once. The line going to
>     east between the polygons is rendered twice. We can see double
>     '+'  on that line.
>
>     How do I render all the lines exactly the same way, without this
>     "double" rendering between polygons?
>
>     Regards,
>
>     Jorge Gustavo
>
>     -- 
>
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>     	
>
>     *Geomaster*
>     *Jorge Gustavo Rocha*| Software Engineer
>
>     *e:*jgr at geomaster.pt <mailto:jgr at geomaster.pt> | *m:*+351 910 333 888
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Email Signature
Logo <https://www.geomaster.pt> 	
*Geomaster*
*Jorge Gustavo Rocha* | Software Engineer
*e:*jgr at geomaster.pt | *m:*+351 910 333 888
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