SV: [mapserver-users] Rendering line crossing iteslf

[Niels-Peter Jensen]

Hi Thomas

The bridge was used as an anology. In fact, the line feature is a bus route
that crosses itself, and we just want to show where the route passes through
an intersection.

Niels-Peter


-----Oprindelig meddelelse-----
Fra: thomas bonfort [mailto:thomas.bonfort at gmail.com] 
Sendt: 11. maj 2011 13:56
Til: Niels-Peter Jensen
Emne: Re: [mapserver-users] Rendering line crossing iteslf


On Wed, May 11, 2011 at 13:51, Niels-Peter Jensen <npj at i-gis.dk> wrote:
> Hi Thomas
>
> Thanks for the quick answer.
>
> We cannot make the style work in the mapfile and have to place it in 
> the symbol file. By the way, we are using Mapserver 5.4.2.
>
> But anyway, I don't think it solves our problem.
> We don't have any "bridge" in our line data, it is just a single line 
> feature that crosses itself.

then how can you distinguish the case of the bridge with the case of the
intersection ? applying the solution I proposed on all lines will give
incorrect cases everywhere you don't have a bridge, so it would not be a
possible solution.

--
thomas

>
> Regards
> Niels-Peter
>
>
> -----Oprindelig meddelelse-----
> Fra: thomas bonfort [mailto:thomas.bonfort at gmail.com]
> Sendt: 11. maj 2011 12:14
> Til: Niels-Peter Jensen
> Cc: mapserver-users at lists.osgeo.org
> Emne: Re: [mapserver-users] Rendering line crossing iteslf
>
>
> An undocumented and "not guaranteed to work in future versions" is to 
> trick mapserver in not drawing the cached base style for bridge lines. 
> As you are avoiding the line caching mechanism, you have to tweak the 
> linecaps for the base style.
>
> CLASS
>   EXPRESSION ([bridge]=1)
>   STYLE
>   END
>   STYLE
>      color black
>      width 5
>      linecap butt
>   END
>   STYLE
>      color yellow
>      width 3
>      linecap round
>   END
>   STYLE
>      color black
>      width 1
>   END
> END
>
> I haven't tested this recently, so please keep in touch if this solves 
> your problem or not.
>
> regards,
> thomas
>
> On Wed, May 11, 2011 at 11:40, Niels-Peter Jensen <npj at i-gis.dk> 
> wrote:
>> Hi users
>>
>> We have a problem in rendering a route based on a line feature.
>>
>> When we use the common way to do that, by using two styles, with a 
>> thick black line that defines an outline, and a thinner defying the 
>> road center, we will not get the desired result.
>>
>> But I want to show where routes cross ("bridge" intersection), and 
>> not as a "normal" intersection, see the attached examples.
>>
>> As there is no outline definition on linefeatures I can't se how that 
>> can be done in a simple way.
>>
>>
>> Niels-Peter
>> I-GIS
>>
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>> mapserver-users at lists.osgeo.org 
>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>>
>>
>
>