Hi, On 7/9/07, Al Byers <[EMAIL PROTECTED]> wrote: > > > On 7/9/07, Andreas Hocevar <[EMAIL PROTECTED]> wrote:
> > The only thing that is not ready yet is to render every feature with a > > unique image. This is planned to do with a SLD based fidFilter, but I > > had no time to implement it. If you are willing to help out here, I > > can give you more details on how it could be done. It should not be > > too much work, and it is all in Mapbuilder - no need to change SVG/VML > > renderers in OpenLayers. > > I have a need for this, so I would be glad to take a stab at it if you wish > to send me some info. Ok, here is some info: First of all, the point where you can insert your custom styling is in GmlRendererOL, in the preFeatureInsert method of the OlLayer object. Currently, this method applies default styles for each feature. Those are taken from the widgets's SLD model in the paint method (look for objRef.defaultStyle and objRef.selectStyle). If you have a style definition based on the feature id (fid) of your feature, you can also apply it in the preFeatureInsert method. There are certainly many ways to do it, but the preferred way in Mapbuilder is to use open standards. And this, again, would be via SLD (Styled Layer Descriptor). Some good examples for SLD can be found at http://docs.codehaus.org/display/GEOSDOC/SLD+Snippets Filters can be applied to SLD, which could look like <FeatureTypeStyle> <Rule> <Filter xmlns="http://www.opengis.net/ogc";> <FeatureId fid="states.3"/> </Filter> <PointSymbolizer> <Graphic> <ExternalGraphic> <OnlineResource xlink:href="images/frog.gif"/> <Format>image/gif</Format> </ExternalGraphic> <Size>10</Size> </Graphic> </PointSymbolizer> </Rule> </FeatureTypeStyle> OGC filters are even more powerful, you can eg. filter by neat queries like PropertyIsGreaterThan. If you get your image sources dynamically from somewhere, you could write a tool that adds FeatureTypeStyles with FeatureId filters to the sld model. You would then maybe add some query methods to StyledLayerDescriptor.js, so you do not need to create XPath queries for getting styles from the SLD model (like currently in the paint method of GmlRendererOL). Those queries go into the preFeatureInsert method then, where you get the appropriate style for your feature based on its fid. Remember that you can save the style to the feature (feature.style), so you do not need to query the sld model every time the feature is drawn. I hope this helps. If you have more questions, do not hesitate to contact me. Regards, Andreas. ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ mapbuilder-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/mapbuilder-devel
