[mapguide-users] Zooming / Moving to a point on the map using the Server Side API

[Gunter Becker]

Hi Carl,

you can use the WebTier API to move and zoom to a special extent. That is
the same the AjaxViewer does. You have to do a server side web request like
you can see in the code below:

string url = WebDomain +
    
"/mapguide/mapagent/mapagent.fcgi?OPERATION=GETVISIBLEMAPEXTENT&VERSION=1.0.0"
+
     "&SESSION=" + MgSessionId +
     "&MAPNAME=" + MapName +
     "&SETVIEWCENTERX=" + Convert.ToString(x, CultureInfo.InvariantCulture)
+
     "&SETVIEWCENTERY=" + Convert.ToString(y, CultureInfo.InvariantCulture)
+
     "&SETVIEWSCALE=" + MapScale.ToString();

System.Net.WebRequest ZoomToViewRequest = System.Net.WebRequest.Create(url);
//WebRequest
System.Net.WebResponse ZoomToViewResponse = ZoomToViewRequest.GetResponse();

Gunter


Carl Jokl wrote:
> 
> I wanted to ask about the process which you have to go through in order to
> use the MapGuide server side API to move the map position and zoom.
> 
> The simple functionality seems to exist on the client side via the
> JavaScript libraries to move the map to a given x, y, position via just a
> just a function call. Inspite of my digging around though I can't find any
> such functionality for the Server side API though I might not be looking
> in the right place.
> 
> It has been suggested that it might require loading, modifying and saving
> XML definitions to achieve this (though this seems like a complicated way
> of doing things). Does anyone have an example of moving / zooming the map
> from the Server API?
> 
> I would not have thought it would be rocket science. For larger, more
> intricate and complex mapping systems such as the one we are working on it
> would be expected the bulk of the business logic would exist on the server
> in the form of libraries there and so doing as much as possible on the
> server is desirable. A the end of the day the JavaScript function
> "ZoomToView" I would expect must call something on the server.
> 

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