[OpenLayers-Users] Loading WMC layers at overlays?

[jvanulde]

Hi Bart,  thanks for that as I think I am half way there now.  The only issue
now is that the layers are not transparent.  They are coming from Mapserver
as PNG's.  Here is my code:

        OpenLayers.IMAGE_RELOAD_ATTEMPTS = 2;
        OpenLayers.Util.onImageLoadErrorColor = "transparent";
        
        var layerOptions = {
            isBaseLayer: false,
            singleTile: true,
            buffer: 0,
            ratio: 1
            };
        
        var format = new OpenLayers.Format.WMC({'layerOptions':
layerOptions});
        var map, context;
        
        function initMap() 
        {           
            // parse wmc into context object            
            var wmc = document.getElementById('<%= hidWMC.ClientID
%>').value;
            context = format.read(wmc, {map: map});                

            // construct a map given the context
            var mapOptions = {
                maxExtent: context.bounds,
                projection: context.srs
                };
                
            map = new OpenLayers.Map("map", mapOptions);
            
            var baseLayerOptions = {
                isBaseLayer: true, 
                displayInLayerSwitcher: false
                };
                
            var fake = new OpenLayers.Layer('fake', baseLayerOptions);
            map.addLayer(fake);
            
            map.addLayers(context.layers);               
            map.addControl(new OpenLayers.Control.LayerSwitcher());
            map.zoomToMaxExtent();     
        }

Is there a way to make the layers transparent now that I have loaded them? 
I think the problem is elsewhere but need some pointers on where to look.  I
have loaded the context in another viewer and the layers come in as
expected.



Bart van den Eijnden wrote:
> 
> Hi Joost,
> 
> you can pass layerOptions to the Format.WMC constructor in order to do
> this. Code example:
> 
> mapfish.OGCUtil.readWMC = function(map, response, noZoom) {
>     var format = new OpenLayers.Format.WMC({layerOptions: {isBaseLayer:
> false, singleTile: true, buffer: 0,ratio: 1}});
> 
>     // remove all layers except the baselayer
>     for (var i = map.layers.length-1; i >= 0; i--) {
>         if (!map.layers[i].isBaseLayer) {
>             map.removeLayer(map.layers[i], false);
>         }
>     }
> 
>     map = format.read(response.responseText, {map: map});
>     ...
> }
> 
> Best regards,
> Bart
> 
>> Thanks John, that works.  Now I need to know how to convert all of the
>> layers in my WMC to overlay's.  Any ideas?
>>
>> -----Original Message-----
>> From: John Pulles [mailto:john.pulles at gmail.com]
>> Sent: Wed 06/08/2008 2:49 PM
>> To: Van Ulden, Joost
>> Cc: users at openlayers.org
>> Subject: Re: [OpenLayers-Users] Loading WMC layers at overlays?
>>
>> 2008/8/6 jvanulde <jvanulde at nrcan.gc.ca>
>>
>>>
>>> Is this possible?  I want to add a fake base layer and load all the WMC
>>> layers as overlays.  Any ideas on how one would go about doing this?
>>
>>
>> You can add a fake base layer with
>>
>> map.addLayer(new OpenLayers.Layer('None', {isBaseLayer: true}));
>>
>> Regards,
>> John
>>
>>
>>>
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> 
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