Non-existant Legend Functionality?

[Stephen Woodbridge]

I would just copy and paste the relevant parts of this thread into a new 
bug and select it as a feature request.

http://mapserver.gis.umn.edu/bugs/index.cgi

-Steve

Abe Gillespie wrote:
> Yep, should be simple enough to keep a tab on the visible layers as 
> they're drawn.  Well, I'll just stick to querying each layer by hand for 
> now.  Where can I go to add a feature request?
> 
> Do we also want to put this into the MapScript API where each class can 
> have something like:
> 
> $class->hasDataInCurrentMapExtents;  // Or something more concise.  :)
> 
> And layers have the equivalent where it's false if each of it's classes 
> are false for the above attribute.
> 
> Thanks.
> -Abe
> 
> On 9/1/05, *Stephen Woodbridge* <woodbri at swoodbridge.com 
> <mailto:woodbri at swoodbridge.com>> wrote:
> 
>     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
> 
>