David,
You can manipulate the opacity of any layer within OL. To change a layers opacity I just use the following method >> layerObjectName.setOpacity(newOpacity); Where newOpacity is a real number between 0 and 1 [0=transparent and 1=opaque therefore 0.5=half transparent etc]. Then all you need is some GUI tool to collect the number from the user. Hope that helps. Brad . From: users-boun...@openlayers.org [mailto:users-boun...@openlayers.org] On Behalf Of David Alda Fernandez de Lezea Sent: Wednesday, November 18, 2009 1:48 AM To: users@openlayers.org Subject: Re: [OpenLayers-Users] SLD on the fly Hello, I'm using MapServer WMS and want to apply some complex SLD to an OL WMS layer. It seems that some features cannot be used in OL, for example putting the text label in the centroid of the polygon or fill-opacity (I can't make this work, even with mapserver). I've been looking to your web page and I've realized that you have a slider bar which lets you set some transparency to the style. How do you do that, if I can ask?? Thanks. Un saludo, ············································································ ······ David Alda Fernández de Lezea Lurralde eta Biodibertsitate Saila / Dpto. de Territorio y Biodiversidad IKT Granja Modelo s/n · 01192 · Arkaute (Araba) ············································································ ······ Tlfnos.: 945-00-32-95 Fax: 945-00.32.90 ············································································ ······ email: da...@ikt.es web: www.ikt.es <http://www.ikt.es/> ············································································ ······ _____ De: users-boun...@openlayers.org [mailto:users-boun...@openlayers.org] En nombre de Brad Spencer Enviado el: lunes, 16 de noviembre de 2009 22:24 Para: 'Pedro Baracho'; 'Ian Turton' CC: 'OpenLayers Users' Asunto: Re: [OpenLayers-Users] SLD on the fly Pedro, I use CubeWerx WMS. This allows you to apply SLDs externally with no effect on STYLES but you can also undertake a PutStyles if you have that access privilege which will add/update the STYLE. I build a library of SLDs if I want to keep them as permanent filters which is important in my case as I am producing an infinite number of thematic maps (DemographicDrapes) from Census statistics. Have a look at http://demos.numaps.com.au/demographicdrapes.html I have built a complex Style Builder application that allows the user to pretty much change all aspects of a SLD and Save or SaveAs. Cheers, Brad . From: users-boun...@openlayers.org [mailto:users-boun...@openlayers.org] On Behalf Of Pedro Baracho Sent: Tuesday, November 17, 2009 7:36 AM To: Ian Turton Cc: OpenLayers Users Subject: Re: [OpenLayers-Users] SLD on the fly Wow, I am impressed! What a cool map that is being displayed on my screen! hehe :) Thanks for the reply. Guess I am set in solution 2. Just another question. I don't see SLD BODY on WMS Spec, but I see it on SLD profile for WMS. And it also states: "GetMap is defined in WMS 1.3. The SLD profile for WMS defines additional parameters allowing clients to request layers to be portrayed according to some specified style." Do you know any map server that doesn't support SLD profile for WMS, but supports WMS? I am just curious about it, because imho it doesn't make sense splitting SLD profile for WMS from WMS spec. On Mon, Nov 16, 2009 at 5:54 PM, Ian Turton <ijtur...@gmail.com> wrote: On Mon, Nov 16, 2009 at 2:29 PM, Pedro Baracho <pedropbara...@gmail.com> wrote: > I need to change SLD on the fly to create some thematic maps. I would also > appreciate if compatibility with OGC's WFS was mantained. Have you guys done > this before? I could use some suggestions... :P > > I have done some searching and came up with a couple of solutions. > > 1- GeoServer GeoExt Styler Plugin. > I don't know if it is a good solution, because as far as I know, it changes > the style of the layer for all the users. I would need to replicate styles > on the server for each user and each layer. And also this requires the > server to be Geoserver, and breaks OGC compatibility. > You are right that will change it for everyone > 2- WMS 1.3 and SLD > MapServer implements WMS 1.3 and accepts a SLD description in the request. > GeoServer doesn't. > Nothing against MapServer, but my current development environment is set > with GeoServer.. Try http://localhost:8080/geoserver/wms?bbox=-130,24,-66,50&Format=image/png&req uest=GetMap&width=550&height=250&srs=EPSG:4326&SLD_BODY=%3CStyledLayerDescri ptor%20version%3D%221.0.0%22%3E%3CUserLayer%3E%3CName%3Etopp:states%3C/Name% 3E%3CUserStyle%3E%3CName%3EUserSelection%3C/Name%3E%3CFeatureTypeStyle%3E%3C Rule%3E%3CFilter%20xmlns:gml%3D%22http://www.opengis.net/gml%22%3E%3CPropert yIsEqualTo%3E%3CPropertyName%3ESTATE_NAME%3C/PropertyName%3E%3CLiteral%3EIll inois%3C/Literal%3E%3C/PropertyIsEqualTo%3E%3C/Filter%3E%3CPolygonSymbolizer %3E%3CFill%3E%3CCssParameter%20name%3D%22fill%22%3E%23FF0000%3C/CssParameter %3E%3C/Fill%3E%3C/PolygonSymbolizer%3E%3C/Rule%3E%3CRule%3E%3CLineSymbolizer %3E%3CStroke/%3E%3C/LineSymbolizer%3E%3C/Rule%3E%3C/FeatureTypeStyle%3E%3C/U serStyle%3E%3C/UserLayer%3E%3C/StyledLayerDescriptor%3E (from the demo requests page in geoserver 1.7.5) - works for all WMS versions. > > 3- WFS and treat SLD exhibition on the client > This is a double edged solution. The good thing about WFS is that I have > many more possibilities of control over the map. I can use SelectFeature > control, instead of hacking some code to implement it over WMS. But it also > gives me many other options I don't need such as the vector data. I only > need the images. Not sure I understand your plan here but sounds like overkill - and may kill off the browser if you have too much data. Ian -- Ian Turton Sent from Houserville, Pennsylvania, United States
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