topic Alter a symbol in ArcGIS Pro SDK Questions

Alter a symbol

Daniel4 — Wed, 12 Jun 2024 12:00:19 GMT

I want to change the fill of polygons, when the user press a button. I am using this to get the render of the layer:

CIMSimpleRenderer currentRenderer = layer.GetRenderer() as CIMSimpleRenderer;

I am saving this render in a dict, to be able to change back later.

I am creating this, I want to alter to change the color of the polygons:

CIMSimpleRenderer newRenderer = layer.GetRenderer() as CIMSimpleRenderer;

I am using this to make a new fill:

var fill = SymbolFactory.Instance.ConstructSolidFill(ColorFactory.Instance.CreateRGBColor(0, 0, 0));

How can I add the fill to the newRender?

For every polygon feature layer in TOC, I want to change the fill color, but retain the outline color.

Re: Alter a symbol

UmaHarano — Wed, 12 Jun 2024 13:15:28 GMT

Symbols are made of layers. You can extract the symbol layers from your renderer's symbol and add the fill symbol to these layers. Here is a code snippet

var renderer = lyr.GetRenderer() as CIMSimpleRenderer; //Get the renderer's symbol and cast it to the type of symbol var polygonSymbol = renderer.Symbol.Symbol as CIMPolygonSymbol; //Get the layers in the symbol var symbolLayer = polygonSymbol.SymbolLayers.ToList(); //Create a solid fill symbol layer var fill = SymbolFactory.Instance.ConstructSolidFill(ColorFactory.Instance.RedRGB); //Add the fill to the symbol layers symbolLayer.Add(fill); //Set the symbol layers back to the symbol polygonSymbol.SymbolLayers = symbolLayer.ToArray(); //Set the symbol back to the renderer renderer.Symbol.Symbol = polygonSymbol; //Set the renderer back to the layer lyr.SetRenderer(renderer);

You can see the renderer's symbol layers in the UI Like this:

Re: Alter a symbol

Daniel4 — Thu, 13 Jun 2024 07:45:37 GMT

Hi Uma, thanks for your answer.

I added the new fill, and can see it like this:

But is there a way, to turn off the visibility of the middle symbol layer?

Re: Alter a symbol

UmaHarano — Thu, 13 Jun 2024 14:01:05 GMT

Since you have access to the SymbolLayers, you can manipulate any of these layers.

//Get the layers in the symbol var symbolLayer = polygonSymbol.SymbolLayers.ToList(); //Can modify the layers in the symbol anyway you want.