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<p>Thank you for the feedback, Karl and Christoph.</p>
<p>Your work around is valid. It is possible to transform the
polygons into lines and then render them correctly.<br>
</p>
<p>It would be nice to have an option to render only once adjacent
polygons, with a a common border.</p>
<p>There is a "Feature request" by Miroslav Umlauf at:
<a class="moz-txt-link-freetext" href="https://github.com/qgis/QGIS/issues/17943">https://github.com/qgis/QGIS/issues/17943</a></p>
<p>I've added my use case.<br>
</p>
<p>Regards,</p>
<p>Jorge<br>
</p>
<div class="moz-cite-prefix">On 11/06/20 12:18, Karl Magnus Jönsson
wrote:<br>
</div>
<blockquote type="cite"
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<p class="MsoNormal"><a name="T_Default_Reply"
moz-do-not-send="true"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Hi!<br>
I had a similar problem. </span></a><span
style="mso-bookmark:T_Default_Reply"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"
lang="EN-GB">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.<o:p></o:p></span></span></p>
<p class="MsoNormal"><span style="mso-bookmark:T_Default_Reply"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"
lang="EN-GB"><o:p> </o:p></span></span></p>
<div>
<p class="MsoNormal"><span
style="mso-bookmark:T_Default_Reply"><b><span
style="font-size:10.0pt;font-family:"Franklin
Gothic Book",sans-serif;color:black">Karl-Magnus
Jönsson</span></b></span><span
style="mso-bookmark:T_Default_Reply"></span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">Från:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">
Qgis-user <a class="moz-txt-link-rfc2396E" href="mailto:qgis-user-bounces@lists.osgeo.org"><qgis-user-bounces@lists.osgeo.org></a>
<b>För </b>Christoph Jung<br>
<b>Skickat:</b> den 11 juni 2020 13:11<br>
<b>Till:</b> Jorge Gustavo Rocha
<a class="moz-txt-link-rfc2396E" href="mailto:jgr@geomaster.pt"><jgr@geomaster.pt></a><br>
<b>Kopia:</b> <a class="moz-txt-link-abbreviated" href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a><br>
<b>Ämne:</b> Re: [Qgis-user] Styling polygon borders:
preventing double rendering between polygons<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi Jorge,<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">If it is just a visual thing, than you
could transform your polygons to lines and delete the
duplicate geometries.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Sincerely,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Christoph<o:p></o:p></p>
<div>
<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">Am 11.06.2020 um 12:45 schrieb
Jorge Gustavo Rocha <<a
href="mailto:jgr@geomaster.pt"
moz-do-not-send="true">jgr@geomaster.pt</a>>:<o:p></o:p></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi
QGisers,<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I'm
trying to style a polygon layer (districts) using a
marker line (using the '+' sign). It works well for
lines.<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">When
I use it in polygons, the outer line is ok, but the
lines between polygons are rendered twice.<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">To
make this question more clear, I've attached the
following print screen:
<a
href="https://nextcloud.geomaster.pt/index.php/s/e3ztdJ894RCf9j6"
moz-do-not-send="true">https://nextcloud.geomaster.pt/index.php/s/e3ztdJ894RCf9j6</a><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">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.<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">How
do I render all the lines exactly the same way,
without this "double" rendering between polygons?<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Regards,<o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Jorge
Gustavo<o:p></o:p></p>
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