Re: [mapserver-users] Mapserver: set symbol on lines according to line features length

[Eichner, Andreas - SID]

AFAIK you need to preprocess your data and use CLASSes in your map file. Using 
OGR or a SQL database you might be able to do this on the fly within your DATA. 
For example, the command
  $ ogrinfo -dialect sqlite -sql "select st_length(geometry) > 10 as longenough 
from water_pipes" water_pipes.shp
creates a computed field containing 1 if the line geometry has a length greater 
than 10. You can then classify on this an apply a symbolization conditionally:

LAYER
  CLASS
EXPRESSION "([longenough] != 0)"
STYLE
  SYMBOL "wp_arrow"
  GAP -100
  COLOR 255 0 0
  OFFSET -5 -99
  SIZE 6
END
  END
  CLASS
# default style goes here
  END
END

I have not tested this but it might give you a hint how to accomplish it.

HTH


> -Ursprüngliche Nachricht-
> Von: mapserver-users [mailto:mapserver-users-boun...@lists.osgeo.org] Im
> Auftrag von wiltomap
> Gesendet: Montag, 30. November 2015 13:34
> An: mapserver-users@lists.osgeo.org
> Betreff: [mapserver-users] Mapserver: set symbol on lines according to
> line features length
> 
> I need to display arrows alongside to line features. Lines represent water
> pipes. The issue I'm facing is that lines are a concatenation of numerous
> line features of various lengths. Therefore, symbols are attached to every
> line, whatever its length. This makes symbols either overlaying or
> touching
> eachother (as in example below).
> 
> <http://osgeo-org.1560.x6.nabble.com/file/n5239136/wpp.png>
> 
> Inside my mapfile, I define the display rules of my symbols in the STYLE
> element:
> 
> STYLE
> SYMBOL "wp_arrow"
> GAP -100
> COLOR 255 0 0
> OFFSET -5 -99
> SIZE 6
> END
> 
> I would like these rules to apply only to line features being more than 10
> meters long (or x map units).
> 
> Thanks in advance for help or any advice!
> 
> 
> Thomas
> 
> 
> 
> 
> --
> View this message in context: http://osgeo-
> org.1560.x6.nabble.com/Mapserver-set-symbol-on-lines-according-to-line-
> features-length-tp5239136.html
> Sent from the Mapserver - User mailing list archive at Nabble.com.
> ___
> mapserver-users mailing list
> mapserver-users@lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/mapserver-users
___
mapserver-users mailing list
mapserver-users@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/mapserver-users

[mapserver-users] Mapserver: set symbol on lines according to line features length

[wiltomap]

I need to display arrows alongside to line features. Lines represent water
pipes. The issue I'm facing is that lines are a concatenation of numerous
line features of various lengths. Therefore, symbols are attached to every
line, whatever its length. This makes symbols either overlaying or touching
eachother (as in example below).

 

Inside my mapfile, I define the display rules of my symbols in the STYLE
element:

STYLE
SYMBOL "wp_arrow"
GAP -100
COLOR 255 0 0
OFFSET -5 -99
SIZE 6
END

I would like these rules to apply only to line features being more than 10
meters long (or x map units).

Thanks in advance for help or any advice!


Thomas




--
View this message in context: 
http://osgeo-org.1560.x6.nabble.com/Mapserver-set-symbol-on-lines-according-to-line-features-length-tp5239136.html
Sent from the Mapserver - User mailing list archive at Nabble.com.
___
mapserver-users mailing list
mapserver-users@lists.osgeo.org
http://lists.osgeo.org/mailman/listinfo/mapserver-users