SV: [Spam] Re: [mapserver-users] Rendering line crossing iteslf

Wed May 11 10:54:37 PDT 2011

Yes, I can't see any solutions, other doing something special in the
crossings, or maybe exploding the theme into all segments, and create a
layer for each segment. But that seems to be a troublesome way to get around
the problem.

The image examples I supplied, was made with ArcGIS. Here it's just outline
definition on a line theme. 
Is there no way to do the same in Mapserver ?

Niels-Peter

-----Oprindelig meddelelse-----
Fra: mapserver-users-bounces at lists.osgeo.org
[mailto:mapserver-users-bounces at lists.osgeo.org] På vegne af Stephen
Woodbridge
Sendt: 11. maj 2011 16:07
Til: mapserver-users at lists.osgeo.org
Emne: [Spam] Re: [mapserver-users] Rendering line crossing iteslf

Oops, right. brain not in gear yet :)

On 5/11/2011 10:04 AM, thomas bonfort wrote:
> ---------- Forwarded message ----------
> From: thomas bonfort<thomas.bonfort at gmail.com>
> Date: Wed, May 11, 2011 at 16:03
> Subject: Re: SV: [mapserver-users] Rendering line crossing iteslf
> To: Stephen Woodbridge<woodbri at swoodbridge.com>
>
>
> Steve,
> That isn't the case. The first style of all the features are rendered 
> in a first phase, and the following ones are rendered in a second 
> phase, so the order is
>
> feature1->style1
> feature2->style1
> ...
> featuren->style1
> feature1->style2
> ...
> featuren->style2
> ...
> ...
> feature1->stylem
> featuren->stylem
>
> without that, you'd get artifacts on road intersections.
>
> --
> thomas
>
>
>
> On Wed, May 11, 2011 at 15:47, Stephen Woodbridge 
> <woodbri at swoodbridge.com>  wrote:
>> 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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