[OpenLayers-Users] Magnifier window

[Alexandre Dube]

Steve,

  Instead of relying on the layer's position in the layers array, try to 
use the following the getLayersByName method (see in my first reply).  
Tell me if that worked.

Alexandre


Steve.Toutant at inspq.qc.ca wrote:
>
> Almost done....Amasing how things are easy to do with OL.
>
> I have a wms layers array, "overlays[]"
> I use this code to create the layers array of the overview map and to 
> define the visibilitychanged event.
> var addLayersToMap = function()
> {        
> for( i in overlays )//overlays contains my wms layers
> {
>         map.addLayer( overlays[i] );
>         ov_overlays[i] = overlays[i].clone();
>         ov_map.addLayer( ov_overlays[i] );
>
>         //Ajoute un listener au niveau de la carte principal pour 
> gérer l'affichage sur la ov_map
>         overlays[i].events.on(
>         {
>                 'visibilitychanged': function(event)
>                 {
>                         
> ov_overlays[i].setVisibility(overlays[i].getVisibility());
>                 }
>         });
> }
> }
>
> in run time, only the visibility of the last layer of the array gets 
> updated in the other map.
> I also tried with map.addLayers after adding the overlays[i]. events 
> on...with the same result
>
> Do you see something wrong
> thanks
> Steve
>
>
>
>
> *Alexandre Dube <adube at mapgears.com>*
>
> 04/02/2010 03:36 PM
>
> 	
> A
> 	Steve.Toutant at inspq.qc.ca
> cc
> 	users at openlayers.org
> Objet
> 	Re: [OpenLayers-Users] Magnifier window
>
>
>
> 	
>
>
>
>
>
>
>
> Hi Steve,
>
>  I think you could do something like that (pseudo-code) :
>
>  Create your original map
>  Create all your layers and add them to the map
>
>  Create your ov-map
>  Register a mapmove event to the map to make ov-map follow it
>  For each layer
>    Clone it and add it to ov-map
>    Register a visibilitychange event to a onVisibilityChanged function
>
>  onVisibilityChanged: function(event)
>    var layers = ov-map.getLayersByName(this.name); // this is the layer
> the visibility was changed
>    if(layers && layers.length == 1)
>      layers[0].setVisibility(this.visibility())
>
> Do you get the idea ?
>
> Best regards,
>
> Alexandre
>
> Steve.Toutant at inspq.qc.ca wrote:
> >
> > Hi,
> > I'm using openlayers with geoext.
> > I would like to create a magnifier window. So it is like an overview
> > map with a fix map center and a fix zoom level, but the main map and
> > this overview map share the same geoext tree, so the layers are
> > shown/hidden on both maps.
> >
> > I think I can do it if I start with the overview map example, here
> > http://www.openlayers.org/dev/examples/example-list.html
> >
> > Does someone have a better idea or already tried this?
> >
> > thanks in advance
> > Steve
> >
> > ------------------------------------------------------------------------
> >
> > _______________________________________________
> > Users mailing list
> > Users at openlayers.org
> > http://openlayers.org/mailman/listinfo/users
> >  
>
>
> -- 
> Alexandre Dubé
> Mapgears
> www.mapgears.com
>
>
>
>


-- 
Alexandre Dubé
Mapgears
www.mapgears.com