HiLiting / selecting multiple features

[Skalski Artur - askals]

Hi
 
Mapserver can't do thing like that, You can't force him to remember previous clicks, but it doesn't have to because Your application can do things like that. I think you could write some function that could remember the clicks of the user, the x & y values, put it into an array and each time send them with the latest point clicked as points to query for mapserver and use mapscript's save and load query, i saw on userslist someone was writing about joining query results ito one result using save and load query, probably easy to find... I think this is the only way to do this.
 
Best Regards
 
Artur

-----Original Message-----
From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU]On Behalf Of Xin
Sent: Monday, April 24, 2006 3:44 PM
To: MAPSERVER-USERS at LISTS.UMN.EDU
Subject: Re: [UMN_MAPSERVER-USERS] HiLiting / selecting multiple features


I haven't received a response in a while.  Can anyone help with what I need?


On 20/04/06, Xin < crazygecko at gmail.com  <mailto:crazygecko at gmail.com> > wrote: 

Hi Steve,

Thanks for the response.  It's always good to know there's someone out there that can help! 

Here's our situation.  We use MapServer CGI wrapped in a C# application.  The app would call MapServer with various CGI parameters depending on what the user is doing in the application. 

One functionality we need is to hilite features on a map and for it to return results of features from other layers intersecting it.  The return results party is working great.

A single feature can be hilited at the moment using mode=featurenquery, slayer, and passing img.x and img.y.  For example, this might be a building parameter.  This works to a degree.  We haven't been able to control the colour correctly with QUERYMAP and COLOR.  But that's another issue.

Hiliting multiple features is what we are after.  We would like our users to be able to click on a feature on the map through our application.  Then we would hilite this through MapServer.  Then the user can click on more features.  We'd like the initial feature, and any features clicked on after to be all hilighted.  e.g. user clicks on three building parameters.

The problem we are facing is hiliting multiple features.  Do you have any suggestions on how we may do this?


Xin



On 13/04/06, Steve Lime < Steve.Lime at dnr.state.mn.us> wrote: 

Xin: There's a big difference between a feature and a shape though. The
imgshape parameter was intended for use with something really simple
like a DHTML digitizer so at this point it only supports a single feature. It 
would not be hard to hack mapserv.c to allow mulitple instances of
imgshape to build up a more complex feature (holes, multiple outer rings).

I'm not sure if that's what you need though. There are other ways to 
highlight features. Perhaps you could describe the steps in which the
application is used along with desired outputs. That would make it easier
to suggest alternatives.

Steve

>>> Xin < crazygecko at GMAIL.COM> 4/13/2006 4:51:47 AM >>>
We are user MapServer cgi to hilite features the user select on.  This is
done by using mode=featurequery and slayer.  We need to selectemultiple
features, and have them hilighted.  Having looked at the docs, there doesn't 
seem to be any obvious ways of doing this.

One possible solution is to use IMGSHAPE and nquery.  This is documented as:

Shape given in image coordinates.

An arbitrary polygon shape to be used for query purposes. Multiple instances 
simply add parts to the shape so it is possible to construct a shape with
holes. Used with modes NQUERY and NQUERYMAP.
But using imgshape would require one than one polygon being passed through.
Rick asked this in March without getting a response.  Is it possible to pass 
multiple polygons using imgshape?

Any other suggestions are more than welcome.

Cheers,
Xin





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