[mapserver-users] symbol at start and end of polyline ?

[thomas bonfort]

On Tue, Jan 19, 2010 at 15:12, Oliver Christen <
oliver.christen at camptocamp.com> wrote:

>  At first I thought I had some oddity with the data I used for my testing
> ( see http://dev.camptocamp.com/~ochriste/line_with_style.png<http://dev.camptocamp.com/%7Eochriste/line_with_style.png> with
> the star symbol on every vertex of one line feature)
>
> but after trying with some other set of data, I only have the star symbol
> on start and end of the whole line feature ( and, strangely, also on
> cross-section if the line separate in two at some point )
>
where the stars are put depends on the structure of your geometry, as stored
in your database or shapefiles


> http://dev.camptocamp.com/~ochriste/line_feature_extremities.png<http://dev.camptocamp.com/%7Eochriste/line_feature_extremities.png>
> so I thought the problem was solved, but upon zooming on the extrmities of
> the line feature, im again having strange behavior:
> http://dev.camptocamp.com/~ochriste/line_feature_extremity_zoomed.png<http://dev.camptocamp.com/%7Eochriste/line_feature_extremity_zoomed.png>
> with multiple star symbols.
> the red star in these two image are from the same line feature.
>
are you sure your class expression matches only one geometry ?


>
> why is there more than 2 stars ?
> does the geomtransform 'end' only work for line features consisting of only
> 2 points ?
>
> ----- Original Message -----
> *From:* thomas bonfort <thomas.bonfort at gmail.com>
> *To:* Oliver Christen <oliver.christen at camptocamp.com>
> *Cc:* mapserver-users at lists.osgeo.org
> *Sent:* Tuesday, January 19, 2010 2:10 PM
> *Subject:* Re: [mapserver-users] symbol at start and end of polyline ?
>
> if you're using postgis, you can use a unique key from your table (i.e.
> gid)
> if you have a shapefile, you'll have to find an or a combination of
> attributes in the dbf that's unique to identify that particular feature.
>
> --
> thomas
>
> On Tue, Jan 19, 2010 at 11:59, Oliver Christen <
> oliver.christen at camptocamp.com> wrote:
>
>>  it makes sens, but how do I do that ?
>> do line segment get automaticaly an id ?
>> or how to get (or set) the id of the line segment?
>>
>>  ----- Original Message -----
>> *From:* thomas bonfort <thomas.bonfort at gmail.com>
>> *To:* Oliver Christen <oliver.christen at camptocamp.com>
>> *Cc:* mapserver-users at lists.osgeo.org
>>   *Sent:* Tuesday, January 19, 2010 10:50 AM
>> *Subject:* Re: [mapserver-users] symbol at start and end of polyline ?
>>
>> well, if you want only one line segment to have start markers, you must
>> tell mapserver which segment that is.
>>
>> On Tue, Jan 19, 2010 at 10:48, Oliver Christen <
>> oliver.christen at camptocamp.com> wrote:
>>
>>>  thx Thomas, but im not sure I understand what you are telling me here.
>>> do line segments have id ?
>>>
>>> ----- Original Message -----
>>> *From:* thomas bonfort <thomas.bonfort at gmail.com>
>>> *To:* Oliver Christen <oliver.christen at camptocamp.com>
>>> *Cc:* mapserver-users at lists.osgeo.org
>>> *Sent:* Tuesday, January 19, 2010 10:30 AM
>>> *Subject:* Re: [mapserver-users] symbol at start and end of polyline ?
>>>
>>> hi,
>>>
>>> class
>>>   expression ([id]=321)
>>>   style
>>>     geomtransform end
>>>     ...
>>>   end
>>> end
>>> class
>>>   style
>>>     ... #all the others
>>>   end
>>> end
>>>
>>> On Tue, Jan 19, 2010 at 10:14, Oliver Christen <
>>> oliver.christen at camptocamp.com> wrote:
>>>
>>>> hello
>>>>
>>>> I would like to add a symbol at the start and end of a polyline.
>>>>
>>>> I tried using GEOMTRANSFORM with "start" and "end" in a style block in
>>>> the layer but sadely this will add a symbol to all start and end of every
>>>> vertex of the polyline, which is not the result wanted :/
>>>>
>>>> is there any way to do that, beside creating a new point layer ?
>>>>
>>>> thanks in advance
>>>> Oliver
>>>> _______________________________________________
>>>> mapserver-users mailing list
>>>> mapserver-users at lists.osgeo.org
>>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>>>>
>>>
>>>
>>
>
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