[Chameleon] ungrouped layers and legendtemplate

[Ken-ichi Ueda]

Hm, now that I look a little closer, I realize that when you have two
layers with the same name, they turn on together but they don't seem
to turn off together.  Have you ever experienced this?  Here's what my
mapfile looks like:

LAYER
        NAME "Highways"
        GROUP "Default"
        DATA "/path/to/highways"
        STATUS ON
        TYPE LINE
        CLASSITEM "TYPE"
        PROJECTION
            "init=epsg:1000"
        END
        CLASS
            NAME "Interstate"
            EXPRESSION "INTER"
            STYLE
                SYMBOL "circle"
                SIZE 2
                COLOR 255 51 51
            END
        END
        CLASS
            NAME "US Highway"
            EXPRESSION 'US-HWY'
            STYLE
                SYMBOL "circle"
                COLOR 102 102 102
                SIZE 1
            END
        END
        CLASS
            NAME "State Highway"
            EXPRESSION 'ST-HWY'
            MAXSCALE 1500000
            STYLE
                SYMBOL "circle"
                COLOR 153 153 153
                SIZE 1
            END
        END
    END


    LAYER
        NAME "Highways"
        GROUP "hidden"
        METADATA
          "legendvis"  "hidden"
        END
        DATA "/path/to/highways"
        STATUS OFF
        TYPE ANNOTATION
        LABELCACHE ON
        CLASSITEM "TYPE"
        LABELITEM "ROUTE1"
        PROJECTION
            "init=epsg:1000"
        END
        CLASS
            NAME "Interstate"
            KEYIMAGE "/path/to/interstate.png"
            EXPRESSION "INTER"
            STYLE
                SYMBOL "/path/to/interstate.png"
                COLOR 0 0 0
            END
            LABEL
                COLOR 255 255 255
                SIZE TINY
                MINFEATURESIZE 75
                MINDISTANCE 250
                POSITION cc
            END
        END
        CLASS
            NAME "State Highway"
            KEYIMAGE "/path/to/statehwy.png"
            EXPRESSION 'ST-HWY'
            MAXSCALE 1500000
            STYLE
                SYMBOL "/path/to/statehwy.png"
                COLOR 0 0 0
            END
            LABEL
                COLOR 0 0 0
                SIZE TINY
                MINFEATURESIZE 75
                MINDISTANCE 250
                POSITION cc
            END
        END
        CLASS
            NAME "US Highway"
            KEYIMAGE "/path/to/ushwy.png"
            EXPRESSION 'US-HWY'
            STYLE
                SYMBOL "/path/to/ushwy.png"
                COLOR 0 0 0
            END
            LABEL
                COLOR 0 0 0
                SIZE TINY
                MINFEATURESIZE 75
                MINDISTANCE 250
                POSITION cc
            END
        END
    END

Ideally I don't want the labelling layer to be visible in the legend,
but I do want it to turn on and off with the data layer.  Any
thoughts?

-Ken-ichi

On 6/1/05, Jacob Delfos <jacob.delfos at maunsell.com> wrote:
>  
> Ken-Ichi, 
>   
> You can adjust your legend template to look for a metadata-value that you
> made up, and then it can use boolean logic to determine whether or not to
> show the layer in the legend. Have a look at
> http://lists.maptools.org/pipermail/chameleon/2004-October/001526.html
>   
> In short: if a layer has the same name as another layer, they will turn on
> and off at the same time, even if only one layer shows in the legend. That
> way you can emulate groups, while also having control of individual layers.
> In your case, I would add a layer to your mapfile, with "STATUS DEFAULT",
> and then use a metadata entry to prevent it from showing in the legend. 
>   
> regards, 
>   
> Jacob 
>   
>   
> -----Original Message-----
> From: chameleon-bounces at lists.maptools.org
> [mailto:chameleon-bounces at lists.maptools.org] On Behalf Of
> Ken-ichi
> Sent: 2 June 2005 06:03
> To: chameleon at lists.maptools.org
> Subject: [Chameleon] ungrouped layers and legendtemplate 
>   
> Hi all.  I feel like this is a problem I have solved in the past but I 
> just can't seem to figure it out: my layers in a map file are organized 
> into GROUPs, and I have an HTML legend template that works fine with the 
> LegendTemplate widget.  However, when I have a layer that isn't a part 
> of a group, it disappears whenever the map is updated (update, zoom, 
> pan, whatever).  I was hoping to use ungrouping layers as a way of 
> hiding them from the legend while still displaying them on the map.  Is 
> Chameleon actually looking to some list of layers generated by 
> LegendTemplate when it draws an updated map?  Is there a better way to 
> effectively "hide" some layers from the legend in Chameleon? 
>   
> Thanks in advance. 
>   
> -Ken-ichi
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>  
>   
>   
> JACOB DELFOS
> SPATIAL INFORMATION ANALYST
> Maunsell Australia Pty Ltd
> 629 Newcastle Street, WA 6007
> PO Box 81, WA 6902
> Leederville 
> Western Australia
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>   
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