Custom UVRenderer

Marianne_BilstedWiese — Mon, 15 Aug 2011 16:06:45 GMT

Hello Forum

I try to implement a custom renderer, that will render a polygon featureclass with unique values.

To start, I simply have hardcoded som colors.

My draw method code goes like this:


 // How to render
 public void draw(IFeatureCursor featureCursor, int drawPhase, IDisplay display, ITrackCancel trackCancel) throws IOException,AutomationException {
     
     try {
      int index = featureCursor.findField("GM_LABEL");

   if (legendID == 1) {
    IFeature feature = featureCursor.nextFeature(); 
    display.setSymbol(blueSymbol());
    do{
     display.drawPolygon(feature.getShape());
     feature = featureCursor.nextFeature();
    }while (feature != null);    
   }

   if (legendID == 2) {
    renderer.setSymbolByRef(greenSymbol());
    renderer.draw(featureCursor, drawPhase, display, trackCancel);  
   }
   
   if (legendID == 3) {

    uvRenderer.setFieldCount(1);
    uvRenderer.setField(0, "GM_LABEL");
    uvRenderer.setDefaultSymbol(redSymbol());
    uvRenderer.setUseDefaultSymbol(true);

    uvRenderer.addValue("LAK", null, blueSymbol());
    uvRenderer.setLabel("LAK", "Blue");
    
    uvRenderer.draw(featureCursor, drawPhase, display, trackCancel);    
   }
   
  } catch (Exception e) {
   System.out.println(e.getMessage());
  }

  return;
 }

This is a desktop extension in java.
The first option draws directly to display as in the custom renderer example, works well.
The second option works via a simple renderer, works well too.
The third option is a try to use a Unique Value Renderer, does not render anything. The polygons are not rendered, screen becomes white.

Does anybody know, if I am missing something, or if it is not possible to reference another renderer from inside the draw method.

Any answer appreciated

Marianne B. Wiese

topic Custom UVRenderer in ArcObjects SDK Questions

Custom UVRenderer