Non-existant Legend Functionality?

[Stephen Woodbridge]

Abe,

I think this would be a very valuable extension and it would not be that 
hard to implement. All that you would need is a bit array that is zeroed 
before a draw request where each bit represents a unique layer-class, 
then as objects are drawn you would OR 1 into the bit array for the 
layer-class index if/when an object is drawn. Then you would need to be 
able to query the bit array for a given layer-class index to see if it 
was drawn.

-Steve W.

Abe Gillespie wrote:
> I build my legends by hand with PHP code because the native 
> functionality just isn't good enough for what I need.  Unfortunately I 
> still can't get it perfect because of what I think is missing MapServer 
> functionality.  Currently my legends are just too big for printing.  Is 
> there a way to tell whether a certain class is visible w/i the current 
> view?  Now I don't mean whether the class is within it's scale limits 
> (MIN or MAXSCALE).  Rather can one tell if a layer / class has any data 
> w/i the current view.  For instance, I may have a fire hydrant layer w/o 
> any scale dependencies.  But I might be zoomed into a field way out in 
> the country side.  So, yeah, technically the layer can be seen at that 
> scale, but no fire hydrants are actually in the view.
> 
> If this doesn't exist, shall I issue a feature request?
> 
> Thanks.
> -Abe