Re: [pmapper-users] dynamic legend, forcing refresh on pmapper 2.1.1

[Armin B. <arm...@gm...>]

Keith

try to use as a starting point this topic from the mailing list:

http://www.mail-archive.com/pma...@li.../msg00494.html

There is an attached PHP script for adding layers dynamically and the 
explanations for it is in a mail later in that posting. They are 
hopefully possible to understand.

armin

Keith Boyle wrote:
> Sorry for my delayed response, and as always thank you for the reply.
> I should have been more complete in describing what I'm up to, dynamic
> legends is too vague. Please forgive me if the following is too
> detailed:
> 
> I'm implementing user created layers in postgres/postgis, allowing the
> user to create certain combinations of existing layers
> (intersections), distance envelopes (buffers) around selected classes
> of selected layers, and even uploading some basic data to create new
> points/shapes.
> 
> I've set up two tables for describing layers, a 'layers' table and a
> 'classes' table that are read after the map file is read. Then through
> php/mapscript I'm adding the layers to the map created by the map
> file.
> 
> All this I'm making progress on, but getting the legend to show the
> new layers I've added via mapscript is really eluding me. For now, I'm
> reloading the entire map.phtml page after the user creates a new
> layer. This works but seems very 'heavy handed' and not very elegant.
> If there is a better way, I'd love to go that path instead.
> 
> Please let me know if you have any suggestions or pointers, I've dug
> through the code base but haven't found a solution to my issue that
> behaves well...
> 
> again, as always, many thanks Armin for a great baseline from which to 
> build!
> -Keith
> 
> 
> On 12/1/06, Armin Burger <arm...@gm...> wrote:
>> what do you mean exactly with 'dynamic legends'?
>>
>> In the current implementation you have the possibility to combine both 
>> TOC and legend, typically in a foldable tree structure. Then the 
>> legend icons are never updated. Or you swap between TOC and legedn 
>> view, then the legend just shows the icons of the visible layers.
>>
>> *Real* dynamic legends with displaying only the icons of visible 
>> classes on the current map extent are something I would like to have 
>> but this would require a base function available via Mapscript.
>>
>> armin
>