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

[Oliver Christen]

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 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 ) 
http://dev.camptocamp.com/~ochriste/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
with multiple star symbols.
the red star in these two image are from the same line feature.

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 
  To: Oliver Christen 
  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 
      To: Oliver Christen 
      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 
          To: Oliver Christen 
          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 
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