[OpenLayers-Users] Magnifier window

[Steve.Toutant at inspq.qc.ca]

Thanks Alexandre,
More detailed... 
Per example, a user could watch the whole world and the ov-map will be 
zoomed on Chicoutimi. Whatever the user do on the main map (panning, 
zooming), I want the ov-map to stick on Chicoutimi, because it is so 
beautiful ;-)
But if a layer is selected on the tree I want both maps to show it.
So if I understood well your idea I don't need to add a mapmove event 
since the ov-map will have a fix position.
But, cloning layers and add handler function on each node will do what I 
expect.

Of course, I need to anchor this new map in the bottom right corner.
Correct me if I'm wrong
thanks again
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
>
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-- 
Alexandre Dubé
Mapgears
www.mapgears.com




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