SV: [mapserver-users] Rendering line crossing iteslf

[Stephen Woodbridge]

Niels-Peter,

I believe that you will need to split the line at the intersection into 
multiple lines to get the display that you want. Because you line just 
crosses itself there is no intersection there. If you split the line 
into multiple segments that there will be an intersection and mapserver 
should render it is desired.

-Steve W

On 5/11/2011 8:18 AM, Niels-Peter Jensen wrote:
> 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
>>>
>>> _______________________________________________
>>> mapserver-users mailing list
>>> mapserver-users at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>>>
>>>
>>
>>
>
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