How to set ClassBreakRenderer on GraphicsOvelay

MaraStoica2 — Sat, 11 Dec 2021 17:20:57 GMT

I'm trying to create a ClassBreakRenderer and set it on a GraphicsOvelay and cannot get it to work. The renderer works fine on a FeatureLayer, but doesn't work on a GraphicsOverlay that's been created using the same data as the FeatureLayer. I'm not sure what I'm missing here. Is there a sample somewhere that shows how to do this? I pasted the code below, and also attached the repro case, in case someone is up for giving me a hand in getting to the bottom of this. Working with 100.5. Thank you!!!

- Mara

private async void RenderData()
{
	// Create a new map based on the streets base map.
	Map newMap = new Map(Basemap.CreateStreets());

	// Create an envelope that covers the continental US in the web Mercator spatial reference.
	Envelope continentalUSEnvelope = new Envelope(-14193469.5655232, 2509617.28647268, -7228772.04749191, 6737139.97573925, SpatialReferences.WebMercator);

	// Zoom the map to the extent of the envelope.
	newMap.InitialViewpoint = new Viewpoint(continentalUSEnvelope);

	// Assign the map to the MapView.
	MyMapView.Map = newMap;
	MyMapView.GraphicsOverlays.Add(new GraphicsOverlay());

	// CHANGE THIS FLAG TO SWITCH TEST BETWEEN FEATURE LAYER AND GRAPHICS OVERLAY
	var useFeatureLayer = true;

	if (useFeatureLayer)
	{
		// set feature layer and renderer and add it to the map
		var featureLayer = new FeatureLayer(new Uri("https://services8.arcgis.com/KsXZDThvSinzJ3pq/arcgis/rest/services/test_pipeline/FeatureServer/0"));
		featureLayer.Renderer = CreateClassBreaksRenderer();
		MyMapView.Map.OperationalLayers.Add(featureLayer);
	}
	else
	{
		// set feature table and query it to retrieve all features
		var featTable = new ServiceFeatureTable(new Uri("https://services8.arcgis.com/KsXZDThvSinzJ3pq/arcgis/rest/services/test_pipeline/FeatureServer/0"));
		var queryParams = new QueryParameters { WhereClause = "1=1" };
		var featureResult = await featTable.QueryFeaturesAsync(queryParams, QueryFeatureFields.LoadAll);

		// create graphics from the features and add them to the map in a graphics overlay
		foreach (var result in featureResult)
		{
			var pipeSegment = result.Geometry;
			var graphic = new Graphic(pipeSegment);
			graphic.Attributes.Add("break", result.Attributes["break"]);
			MyMapView.GraphicsOverlays[0].Graphics.Add(new Graphic(pipeSegment));
		}

		// create and set renderer for the graphics overlay
		MyMapView.GraphicsOverlays[0].Renderer = CreateClassBreaksRenderer();
	}
}

private ClassBreaksRenderer CreateClassBreaksRenderer()
{
	// Create symbols
	var symbol1 = new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.Red, 7);
	var symbol2 = new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.Yellow, 7);
	var symbol3 = new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.Green, 7);

	// Create class breaks
	List<ClassBreak> listClassBreaks = new List<ClassBreak>
	{
		new ClassBreak("1", "1", 0, 1, symbol1),
		new ClassBreak("2", "2", 1, 2, symbol2),
		new ClassBreak("3", "3", 2, 3, symbol3),
	};

	// Create and return the a class break renderer for use with the "break" field
	return new ClassBreaksRenderer("break", listClassBreaks);
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: How to set ClassBreakRenderer on GraphicsOvelay

KimberlySaballett — Mon, 26 Aug 2019 18:59:06 GMT

The DefaultSymbol for the ClassBreaksRenderer seems to be working fine when it is set. I believe the class breaks symbology not applying may be more an issue with the renderer not being able to reach the graphic's attributes but we'll need to test it further.

Re: How to set ClassBreakRenderer on GraphicsOvelay

dotMorten_esri — Mon, 26 Aug 2019 19:23:48 GMT

Looks like you're adding the wrong graphic (a new instance that doesn't have that attribute set)

Change

MyMapView.GraphicsOverlays[0].Graphics.Add(new Graphic(pipeSegment));

MyMapView.GraphicsOverlays[0].Graphics.Add(graphic);

Re: How to set ClassBreakRenderer on GraphicsOvelay

MaraStoica2 — Mon, 26 Aug 2019 20:22:53 GMT

I was afraid it was something silly like that. Thanks Morten!

topic Re: How to set ClassBreakRenderer on GraphicsOvelay in .NET Maps SDK Questions

How to set ClassBreakRenderer on GraphicsOvelay

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Re: How to set ClassBreakRenderer on GraphicsOvelay

Re: How to set ClassBreakRenderer on GraphicsOvelay