[mapserver-dev] MapServer legend functionality

[Brent Fraser]

Bob,

   Yes that's possible; and so is using Mapscript.  My hope was that I (and 
others wanting to do bound styling) could generate a legend with a minimum of 
scripting/coding/querying.  Personally, I think bound styling could be very 
powerful, especially when combined with a user login, a web page to 
"create/define" layers and classes, and the GeoMOOSE/OpenLayers ability to 
digitize features (what's next? a web-based GIS, oh nooo...)

Brent

Bob Basques wrote:
> 
> 
> Brent,
> 
> 
> Ok, this is sort of way out there, I read your Legend Mail (MSG10603) 
> and wondered about . . .
> 
> 
> What if you use MapServer with a template, to build a Mapfile on the fly 
> from the database query, then pass that in to MapServer for legend 
> rendering?  Seems like the long way round, but might prove an 
> interesting experiment to work out a permanent solution.
> 
> 
> Also, wasn't there work recently related to passing in a Mapfile via 
> CGI?  Maybe there is a possibilty of piping these operations together 
> somehow, just thinking out loud here.
> 
> 
> bobb
> 
> 
> 
> 
>> >> Brent Fraser <bfraser at geoanalytic.com> wrote:
> 
> Yewondwossen Assefa wrote:
>>  On 11/06/2010 11:54 AM, Lime, Steve D (DNR) wrote:
>> > I think it would be a reasonable addition. Are you thinking about
>> > simply adding a visibility flag to a layer and flipping it
>> > if features are rendered? Often legend rendering is done separately
>> > from drawing, as two separate requests. Presumably you'd
>> > need a something like a fake draw map option in the legend code to
>> > make a drawing-like pass through the data. Could get expensive.
>> >
>> >   
>>  Yes,  it could be an expensive operation to do a fake draw to get the
>>  legend. I am wondering if we could save something when a draw is done
>>  and retrieve it for the legend if it validates the current
>>  layers/extent  constraint.  Draw and legend are separate process but
>>  come usually one after the other so trying to take into account that
>>  fact might help.
>>
>>  regards
>>
> 
> 
> And it could solve my problem of generating a legend when using bound 
> styling
> (http://www.mail-archive.com/mapserver-users@lists.osgeo.org/msg10603.html)
> 
> Best Regards,
> Brent Fraser
> 
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