leg_class_html block (using mapserv 4.6.2)

[Brent Lund]

I've set up a road layer with class definitions that vary the line type
based on the viewing scale.    

 

http://mapserver.gis.umn.edu/docs/howto/html_legend/#class-block shows
the following

 

"e.g. opt_flag=14 (shown below) means do not show classes in the legend
that are out of scale."

 

This is not true.   opt_flag=14 means do not show LAYERS in the legend
that are out of scale.   

 

Something like the following won't work.  (Both or neither class appear
in the leg_class_html block, depending on the layer's maxscale/minscale
definition)

...

    CLASSITEM "csah_hwy"

    CLASS

      NAME "County Road"

      MAXSCALE 1000000

      MINSCALE 150000

      SYMBOL 'circle'

      COLOR 102 102 102

    END

    CLASS

      NAME "County Road"

      MAXSCALE 150000

      STYLE

        COLOR 102 102 102

        SYMBOL 'circle'

        SIZE 6

      END

      STYLE

        COLOR 255 255 255

        SYMBOL 'rectangle-train'

        SIZE 2

      END

    END

...

 

 

To get around this, one needs to split the class definitions into 2
layers and set the maxscale/minscale for the layers.

 

 

Brent

 

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