[mapserver-users] Rendering of adjacent dashed lines

[Richard Greenwood]

As others have suggested, you need to "preprocess your data to merge
adjacent lines into one". This can be done with topology. PostGIS has
topology support. You would have to convert (and maintain) your simple
features polygons as a PostGIS topology and then render them as lines (not
polygons) in MapServer. There is also TopoJSON but I have not used it. I
think it provides client-side support for topology, which is not exactly
what you are asking about, but might be worth a look.

Rich


On Fri, Jun 17, 2016 at 2:47 PM, Ziegler Stefan <Stefan.Ziegler at bd.so.ch>
wrote:

> Hi Jukka
>
> Yes. Seems similar to what you can do with QGIS.
>
> Regards
> Stefan
>
> > -----Ursprüngliche Nachricht-----
> > Von: Rahkonen Jukka (MML) [mailto:jukka.rahkonen at maanmittauslaitos.fi]
> > Gesendet: Freitag, 17. Juni 2016 16:20
> > An: Ziegler Stefan; 'mapserver-users at lists.osgeo.org'
> > Betreff: Re: Rendering of adjacent dashed lines
> >
> > Hi,
> >
> > The only method that really works is to remove adjacent lines. Your
> trick seems to be
> > the same as this https://knowledge.autodesk.com/support/autocad-map-
> >
> 3d/troubleshooting/caas/sfdcarticles/sfdcarticles/Using-a-dashed-line-symbol-with-
> > adjacent-polygons-masking.html
> > but they used a wider white line. However, it feels usable only if the
> background is also
> > white and there are no lines very close to each other.
> >
> > -Jukka Rahkonen-
> >
> >
> > Ziegler Stefan wrote:
> >
> > > Hi
> >
> > > I'm trying to render some lines with a pattern. This works and looks
> great as long as
> > the lines are not adjacent. When the lines share a common border the
> dashed lines
> > may look ugly since one dashed line is rendered on top of the other
> rendered dashed
> > line. I tried to add a white solid line under the dashed line:
> >
> >     CLASS
> >       STYLE
> >         COLOR 255 255 255
> >         WIDTH 2
> >         LINECAP BUTT
> >       END
> >       STYLE
> >         COLOR 0 0 0
> >         WIDTH 2
> >         LINECAP BUTT
> >         PATTERN 20 4 2 4 2 4 END
> >       END
> >     END
> >
> >
> > But the behaviour is still the same. Is there a trick/workaround for
> this? I'm using
> > MapServer 7.0.1.
> >
> > Best regards
> > Stefan Ziegler
> >
> >
> >
> > Freundliche Grüsse
> > Stefan Ziegler
> > Kantonsgeometer / Leiter Amt für Geoinformation
> >
> > Amt für Geoinformation
> > Rötistrasse 4
> > 4500 Solothurn
> >
> > Telefon +41 32 627 75 96
> > Telefax +41 32 627 75 98
> > stefan.ziegler at bd.so.ch
> > http://www.so.ch
> >
> > _______________________________________________
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-- 
Richard W. Greenwood, PLS
www.greenwoodmap.com
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