[Chameleon] Query by rectangle

Paul Spencer
Wed, 10 Mar 2004 08:23:28 -0500
Not a problem :)

The current query widget is only 'query by point' for a very good 
reason.  The core capabilities of Chameleon were developed under 
contract with the Canadian Government to solve a specific problem for 
them.  Part of their requirements was that the capability work with OGC 
data sources (specifically, WMS servers).  There was no scope in that 
contract to provide non-WMS support.  Since WMS supports only query by 
point capability, that's all the current query widget does :)

Since that contract, we determined that Chameleon would be useful to a 
larger mapserver audience, so we have been busy working on making it 
work for both OGC and local data sources.  But it still has quite a 
'web-centric' way of working.

I would expect that the current query widget will be modified at some 
point to include two modes of operation: mode="point" and 
mode="rectangle".  The intention would be to allow the application 
designer to decide if the query widget can do only point or both point 
and rectangle queries.  I suspect that we will be developing this in the 
near future as this is a common feature needed by most applications.



Gianluigi Nozza wrote:

> Hi all
> Excuse the question storm I'am creating, I have other posts waiting for
> answers (I hope), I would like to incorporate a query by rectangle
> capability in a chameleon application, something already available for rosa
> users in the maplab environment. I didn't find any widget in chameleon
> supposing to do the task, I have the same problem with locating geometric
> features (the other question I have posted) by means of a user specified
> "string" i.e. (locate and zoom to the extent of the following feature:
> parcel n. 1234.
> I have seen that Mapserver function has probably function to do both the
> task, but I am not a programmer, so I am looking for "ready widgets" in
> chameleon, but it seems that this capabilities where neglected by the Dm
> Solution developer theme, Is it correct ?
> As you can understand, I am involved much more on the side of the user,
> rather then the developer, since I am a Gis analyst. That's the reason I'am
> trying to find in chameleon these basic GIS capabilities.
> Any help, widget, or code example greatly appreciated.
> _______________________________________________
> Chameleon mailing list

|Paul Spencer                     |
|Applications & Software Development                              |
|DM Solutions Group Inc       |

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