[mapserver-dev] MapServer legend functionality

[Brent Fraser]

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