renderer

Defines the symbology for displaying aggregated geoelements. Only SimpleRenderer, UniqueValueRenderer, and ClassBreaksRenderer are currently supported for AggregationFeatureReduction.renderer. UniqueValueRenderer with multiple fields is not supported. If the renderer passed is not one of the supported renderer types listed above then original features from the FeatureLayer or original graphics from the GraphicsOverlay are drawn using FeatureLayer.renderer or GraphicsOverlay.renderer respectively. In the case of FeatureLayer, a LayerViewState that contains an error indicating the use of an unsupported renderer is bubbled up. Also, note that AggregationFeatureReduction.renderer is independent of FeatureLayer.renderer and GraphicsOverlay.renderer.

If you want to symbolize aggregate geoelements using the same symbology used by the FeatureLayer or GraphicsOverlay, you may clone FeatureLayer.renderer or GraphicsOverlay.renderer and set it here. You can also create a new renderer of a supported type. If you create a new SimpleRenderer, aggregate geoelements will display with the symbol defined for the SimpleRenderer. If the new renderer is of type ClassBreaksRenderer or UniqueValueRenderer, the field name on the renderer must match one of the AggregateField in AggregationFeatureReduction.aggregateFields. If this field is not found in AggregationFeatureReduction.aggregateFields, aggregate geoelements will draw using ClassBreaksRenderer.defaultSymbol or UniqueValueRenderer.defaultSymbol. If there is no default symbol defined, aggregate geoelements will not draw.

Note: Updating the renderer causes data to be re-aggregated.