[OpenLayers-Users] Map Base layers and controls

[christopher.schmidt at nokia.com]

On Aug 8, 2010, at 7:02 PM, ext ilias kanellos wrote:

> Hello developers, 
> 
> I am trying to do a basic setup of a map with some base layers and a few navigation controls. I've started by trying out only a WMS and a Virtual Earth layer. I also added a layer switcher control, and I tried setting the basic map navigation keys. It all seems to work for the WMS layer, but on the Virtual earth layer it seems that only zooming is possible and it won't pan. What's more, it seems that the Virtual earth layer isn't "following" any panning that is done when WMS is selected. Instead everytime I change to the Virtual Earth layer the map centers on a fixed position with only the zoom level changed. Can anyone point out where the problem might be?  

"""
var map = new OpenLayers.Map('map');
var layer = new OpenLayers.Layer.VirtualEarth("Virtual Earth",

 
{

     
sphericalMercator: true,

     
maxExtent: new OpenLayers.Bounds(-20037508.34,-20037508.34,20037508.34,20037508.34)

 
});
map.addLayer(layer);
map.zoomToMaxExtent();

As you can see from the maxExtent parameter sent in the constructor of the layer, the coordinates stretch from -20037508.34 to 20037508.34 in each direction.
"""

 -- http://docs.openlayers.org/library/spherical_mercator.html

> My code looks like this:
> 
> 
>                     //Creating a new map object
>                     var newMap = new OpenLayers.Map(divId, 
>                                     {
>                                      controls: [],
>                                      projection: "EPSG:4326"
>                                     }
>                                 );
> 
>                     //Creating wms url table
>                     var urlArray = ["http://t1.labs.metacarta.com/wms-c/Basic.py",
>                                     "http://t2.labs.metacarta.com/wms-c/Basic.py",
>                                     "http://t3.labs.metacarta.com/wms-c/Basic.py",
>                                     "http://t4.labs.metacarta.com/wms-c/Basic.py"];
>                                     
>                     //Creating a WMS layer                                              
>                     var wms = new OpenLayers.Layer.WMS("WMS", urlArray,
>                                     {
>                                      layers: 'basic',
>                                      displayOutsideMaxExtent: true
>                                     }
>                                 );
> 
>                       //Creating a virtual earth layer
>                       var VEhybrid = new OpenLayers.Layer.VirtualEarth("Virtual Earth", 
>                                     {
>                                      type: VEMapStyle.Hybrid,
>                                      sphericalMercator: true
>                                     }
>                                 );  
> 
>                     //Setting layers and starting zoom
>                     newMap.addLayers([wms, VEhybrid]);
>                     newMap.zoomTo(1);
> 
> 
>                     //Adding map controls
>                     newMap.addControl(new OpenLayers.Control.LayerSwitcher());
>                     newMap.addControl(new OpenLayers.Control.PanZoomBar({zoomWorldIcon:true}));
>                     newMap.addControl(new OpenLayers.Control.Navigation
>                                            (
>                                                 {
>                                                     zoomBoxEnabled: true,
>                                                     zoomWheelEnabled: true,
>                                                     zoomBoxKeyMask: OpenLayers.Handler.MOD_SHIFT,
>                                                     autoActivate: true                                                    
>                                                 }
>                                            )
>                                       );
>                     newMap.addControl(new OpenLayers.Control.MousePosition());
> 
> ------------------------------------------------------------------------------------------------------------------------------------
> 
> I'm sorry if this topic is novice, but i'm a newbie to openlayers and i couldn't find any answer to this.
> Also, it seemed to me that the open layers example page had a similar problem when using WMS and bing maps together.
> Thank you for your help
> <ATT00001..txt>