[udig-devel] Creating own renderer

[Mark Presling]

Hi. Sorry to bug the list again, but I have been trying to create my own renderer based on BasicFeatureRenderer to render the features of a WFS layer. What I have done is this: Make a copy of BasicFeatureRenderer called RoadEventFeatureRenderer. The only thing different at this stage is the name and package Make a copy of BasicFeatureMetricsFactory called called RoadEventFeatureMetricsFactory. The differences are the name/package, what it returns in createMetrics() and and getRendererType() and a check in canRender() that returns true only for a particular layer name String layerName = context.getLayer().getName(); String layerName = context.getLayer().getName();if (context.getLayer() instanceof SelectionLayer && fs != null && "roadevent_pnt".equalsIgnoreCase(layerName)) { System.err.println("RoadEventFeatureMetricsFactory returning true for " + layerName); return true; } Make a copy of BasicFeatureMetrics called called RoadEventFeatureMetrics. Changed types to match those above. Modify BasicFeatureMetricsFactory to return false for the particular layer identified above. Register my renderer with the extension point net.refractions.udig.project.renderer in my plugin.xml <extension point="net.refractions.udig.project.renderer"> <renderer class="nz.govt.transit.callcenter.RoadEventFeatureMetricsFactory"/> </extension> Run app. What I find through debugging is that the renderer is called as expected, but for some reason it is not outputting anything. Please note that I have not modified the actual rendering code... it still uses the StreamingRenderer as the existing one does. I have noticed that the filter/queries that are set on the layer are different to the ones set when using BasicFeatureRenderer. In BFR the filter is: Query: [Request All Features] feature type: null filter: Filter.NONE [properties: ALL ] but in mine it was Filter.ALL (which I believe means filter OUT everything - return nothing). So I explicitly set the query to Query.ALL in the setQueries() method of my BFR clone. So, this meant that the feature collection returned in the StreamingRenderer had 24 items in it now. Good. However, still nothing is rendered and when you click on the layer it says "Layer not rendered" in the status bar. Another thing of concern is that on the console I see this: Current Renderers: CompositeRendererImpl RenderExecutorImpl:BasicWMSRenderer2-highway RenderExecutorImpl:BasicFeatureRenderer-nmcregion_poly I have 1 WMS layer and 2 WFS layers - one of which I want to render with my renderer. As you can see, my renderer doesn't appear in this list, but it is definitely instantiated and the render method is definitely called on it. Is there something that I am missing in terms of extensions or classes that I need to implement? My intention is to just implement a renderer, not the whole stack of DataSource/FeatureSource/etc. Thanks, Mark -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

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