I didn't realize that I could merge with an existing map object. How would one do that? Arnd, I did try to loop over the layers in the context before I added them to my map oject but I can't seem to access any of the properties. How do I access the transparent property/parameter?
Thanks for helping me out with this. Bart van den Eijnden wrote: > > Hi Arnd, > > you're absolute right. I didn't see that Joost was not merging the > context with an existing map object, like I am doing, in which case you > don't have that kind of control. > > Best regards, > Bart > > Arnd Wippermann wrote: >> Why not loop over context.layers before adding the layers? >> >> Arnd Wippermann >> >> -----Ursprüngliche Nachricht----- >> Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] >> Im >> Auftrag von Bart van den Eijnden (OSGIS) >> Gesendet: Samstag, 9. August 2008 12:04 >> An: jvanulde >> Cc: users@openlayers.org >> Betreff: Re: [OpenLayers-Users] Loading WMC layers at overlays? >> >> Hi Joost, >> >> unfortunately there is no easy way to override this at the moment in OL, >> see >> also: >> >> http://trac.openlayers.org/ticket/1513 >> >> What you can do is loop over your layers and then set >> layer.params.TRANSPARENT to 'true', but it might be too late since the >> layer >> will have actually been drawn already. >> >> Otherwise change the default WMS parameters of OpenLayers, >> >> /** >> * Constant: DEFAULT_PARAMS >> * {Object} Hashtable of default parameter key/value pairs >> */ >> DEFAULT_PARAMS: { service: "WMS", >> version: "1.1.1", >> request: "GetMap", >> styles: "", >> exceptions: "application/vnd.ogc.se_inimage", >> format: "image/jpeg" >> }, >> >> to e.g. format "image/png" and transparent "true". >> >> Best regards, >> Bart >> >> jvanulde wrote: >> >>> 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:[EMAIL PROTECTED] >>>>> Sent: Wed 06/08/2008 2:49 PM >>>>> To: Van Ulden, Joost >>>>> Cc: users@openlayers.org >>>>> Subject: Re: [OpenLayers-Users] Loading WMC layers at overlays? >>>>> >>>>> 2008/8/6 jvanulde <[EMAIL PROTECTED]> >>>>> >>>>> >>>>> >>>>>> 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 >>>>> >>>>> >>>>> >>>>> >>>>>> -- >>>>>> View this message in context: >>>>>> http://www.nabble.com/Loading-WMC-layers-at-overlays--tp18859376p18 >>>>>> 859376.html Sent from the OpenLayers Users mailing list archive at >>>>>> Nabble.com. >>>>>> >>>>>> _______________________________________________ >>>>>> Users mailing list >>>>>> Users@openlayers.org >>>>>> http://openlayers.org/mailman/listinfo/users >>>>>> >>>>>> >>>>>> >>>>> _______________________________________________ >>>>> Users mailing list >>>>> Users@openlayers.org >>>>> http://openlayers.org/mailman/listinfo/users >>>>> >>>>> >>>>> >>>> _______________________________________________ >>>> Users mailing list >>>> Users@openlayers.org >>>> http://openlayers.org/mailman/listinfo/users >>>> >>>> >>>> >>>> >>> >>> >> >> >> -- >> Bart van den Eijnden >> OSGIS, Open Source GIS >> [EMAIL PROTECTED] >> http://www.osgis.nl >> >> _______________________________________________ >> Users mailing list >> Users@openlayers.org >> http://openlayers.org/mailman/listinfo/users >> >> >> >> > > > -- > Bart van den Eijnden > OSGIS, Open Source GIS > [EMAIL PROTECTED] > http://www.osgis.nl > > _______________________________________________ > Users mailing list > Users@openlayers.org > http://openlayers.org/mailman/listinfo/users > > -- View this message in context: http://www.nabble.com/Loading-WMC-layers-at-overlays--tp18859376p18921083.html Sent from the OpenLayers Users mailing list archive at Nabble.com. _______________________________________________ Users mailing list Users@openlayers.org http://openlayers.org/mailman/listinfo/users