[mapserver-users] Rendering of adjacent dashed lines

[thomas bonfort]

Jukka,
The overlapping case has a technical solution (which is not
implemented in mapserver) if you are willing to eventually offset your
dash pattern at every line vertice. The adjacent case has no solution
I can think of (draw two adjacent concentric circles on a whiteboard
and try to dash them if you don't believe me :)
--
thomas

On 17 June 2016 at 16:20, Rahkonen Jukka (MML)
<jukka.rahkonen at maanmittauslaitos.fi> wrote:
> 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
>
>
>
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