RE: [mapserver-users] Expressions on Cluster Objects

[Fawcett, David (MPCA)]

Thanks Tamas.

Here is the layer snippet:

LAYER
  NAME "sites"
  STATUS default
  DATA 'sites'
  TYPE POINT
  CLUSTER
     MAXDISTANCE 50
     REGION "ellipse"
  END
  LABELITEM "Cluster:FeatureCount"

  CLASS
     NAME "small"
     EXPRESSION ("[Cluster:FeatureCount]" < "11")
     STYLE
        COLOR 255 0 0
        SYMBOL "circle"
        SIZE 20
     END
     LABEL
           FONT "arial"
           TYPE TRUETYPE
           SIZE 8
           COLOR 255 255 255
     END
  END
    CLASS
     NAME "medium"
     EXPRESSION ("[Cluster:FeatureCount]" < "100")
     STYLE
        COLOR 255 0 0
        SYMBOL "circle"
        SIZE 35
     END
     LABEL
           FONT "arial"
           TYPE TRUETYPE
           SIZE 8
           COLOR 255 255 255
     END
  END
    CLASS
     NAME "large"
     STYLE
        COLOR 255 0 0
        SYMBOL "circle"
        SIZE 50
     END
     LABEL
           FONT "arial"
           TYPE TRUETYPE
           SIZE 8
           COLOR 255 255 255
     END
  END
END

From: mapserver-users-boun...@lists.osgeo.org 
[mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Tamas Szekeres
Sent: Wednesday, October 12, 2011 2:53 PM
To: Fawcett, David (MPCA)
Cc: mapserver-users@lists.osgeo.org
Subject: Re: [mapserver-users] Expressions on Cluster Objects

David,

I think that option should indeed work in the class expressions. Do you have a 
more complete example (map file)?

Best regards,

Tamas


2011/10/12 Fawcett, David (MPCA) 
<david.fawc...@state.mn.us<mailto:david.fawc...@state.mn.us>>
I have been playing around with the new cluster functionality a little bit.

I am looking for way to classify the clusters based on their feature counts.  
E.g. larger circles for clusters of > 10 features and even larger circles for 
clusters of > 100 features.

Because Cluster:FeatureCount returns a string, the below expression can 
evaluate to True for values like "109"

("[Cluster:FeatureCount]" < "11")

Does anyone have any suggestions?

Maybe I am just misusing Clusters...

Thanks,

David.

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