[Fwd: Re: [UMN_MAPSERVER-DEV] single classed layers and GetLegendGraphic]

[Bart van den Eijnden]

Hi,

If I understand correctly, the problem is that GetLegendGraphic for single
class layers returns the text next to the image if the Rule is not
specified?

Maybe I am missing some part here in the discussion, but is a GetStyles
request not intended for getting the rule names?

>> We can use RULE=, however how would a WMS client know what the
>> rule/class names are?

BTW, I had not re-subsribed to the mapserver-dev list, I had not realized
it was also moved to the new listserv ...

Best regards,
Bart

> Kralidis,Tom [Burlington] wrote:
>
>>>-----Original Message-----
>>>From: Yewondwossen Assefa [mailto:assefa at dmsolutions.ca]
>>>Sent: Monday, 08 November, 2004 10:30
>>>To: Kralidis,Tom [Burlington]
>>>Cc: MAPSERVER-DEV at LISTS.UMN.EDU
>>>Subject: Re: [UMN_MAPSERVER-DEV] single classed layers and
>>>GetLegendGraphic
>>>
>>>
>>>Is it possible for you to use the RULE parameter (set to the
>>>class name
>>>) ? That should retun only the icon for the class.
>>>If not, I am not sure what the best solution is. Maybe add a
>>>support to
>>>a vendor specific request parameter that alaways return an
>>>icon for the
>>>first class. I personnaly prefer this way rather than having
>>>a diffrent
>>>behaviour when there is one or more than one classes. Comments ?
>>>
>>
>>
>> We can use RULE=, however how would a WMS client know what the
>> rule/class names are?
>>
>> I have received some other responses which favour this approach because
one can get a 'full' legend without the need to print out text, as it's
handled in the output graphic.  This makes sense in this context.
>>
>> As a result, what do people think about:
>>
>> - making GetLegendGraphic always return icon ONLY for single-class
layers, full for multiple classes (as per now)
>> - adding in VendorSpecificCapabilities called "GetLegend" which would
return a 'full' legend, titles and all for multiple layers, so someone
can get a single legend icon for multiple WMS layers from the same WMS?
We could also extend so that such a request can also ingest a Web Map
Context Document and output a single legend graphic.
>>
>> Comments?
>>
>
> I waited a bit for others to respond.
>
> I personally like the idea of giving the control to the user to output
full legend or icons based on a specific VendorSpecificCapabilities.
>  %2