[OpenLayers-Users] Transparency for WMS layers cached with GeoWebcache

[bartvde at osgis.nl]

Jpeg does not have transparency, so change your format to something else.

Best regards,
Bart

>
> Good afternoon,
> I am trying to setup some transparency for a layer which is cached by GWC.
> This is my code:
>
> var options = { maxExtent: new OpenLayers.Bounds(-180,-90,180,90),
>                                         units: 'degrees',
>                                         projection: "EPSG:4326",
>                                         maxResolution: 0.703125
>                   };
> var map = new OpenLayers.Map('map',options);
>
> var wms = new OpenLayers.Layer.WMS("All Areas","/figis/geoserver/wms?",
>
> {layers:'fifao:FAO_DIV',
>                                                                 format:
> 'image/jpeg'},{buffer: 0, isBaseLayer: true, wrapDateLine: true,
> singleTile:
> true});
>
>
> var wms3 = new
> OpenLayers.Layer.WMS("Countries","/figis/geoserver/gwc/service/wms?service=wms",
>
> {layers:'fifao:UN_CONTINENT',
>
> transparent:true,
>                                                                 format:
> 'image/jpeg'},{buffer: 0,opacity: 0.85,isBaseLayer: false, wrapDateLine:
> true});
>
> var wms_continent_background = new
> OpenLayers.Layer.WMS("Background","/figis/geoserver/wms?service=wms",
>                                                                 {layers:
> 'fifao:ISO3_COUNTRY',
>
> format:'image/jpeg',
>
> transparent:true,
>
> "cql_filter":"ISO_3='EUR'"},{buffer: 0, wrapDateLine: true, isBaseLayer:
> false, singleTile: true});
>
> map.addLayer(wms);
> map.addLayer(wms3);
> map.addLayer(wms_continent_background);
>
> map.zoomToMaxExtent();
>
> In that configuration, FAO_DIV and ISO3_COUNTRY are the only layers to be
> displayed.
>
> When i remove the transparency option for the UN_CONTINENT layer, the map
> is
> correctly generated but FAO_DIV which is my base layer can only be seen
> partially:
> http://www.nabble.com/file/p19900780/Untitled-2opy.jpg
>
> I really need to have this UN_CONTINENT to be transparent. I know it can
> be
> done.
>
> Could someone tell me how to put this layer which is cached by GWC as
> transparent in my configuration?
>
> Thanks a lot in advance
>
> Sylvain
> OL 2.6
> Geoserver+GWC:1.7-RC3
> Oracle Locator DB
> --
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> http://www.nabble.com/Transparency-for-WMS-layers-cached-with-GeoWebcache-tp19900780p19900780.html
> Sent from the OpenLayers Users mailing list archive at Nabble.com.
>
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