[mapserver-dev] MapServer legend functionality

Brent Fraser bfraser at geoanalytic.com
Mon Jun 14 10:54:14 EDT 2010

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 

Best Regards,
Brent Fraser

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