topic FeatureLayer.SelectFeature() - Polygon fill symbol (Colorize the area of a polygon) in .NET Maps SDK Questions

FeatureLayer.SelectFeature() - Polygon fill symbol (Colorize the area of a polygon)

OliverBrandt2 — Thu, 21 Jan 2016 19:49:27 GMT

Hi all,

how can I fill the whole polygone after selecting it on a featureLayer? FeatureLayer supports only to highlight the lines of the polygon by default. In ArcMap it is possible to set a selection symbol, which allows to color the included area.

Do anybody have an idea to solve this?

Thank you guys!

Re: FeatureLayer.SelectFeature() - Polygon fill symbol (Colorize the area of a polygon)

AnttiKajanus1 — Mon, 25 Jan 2016 13:42:53 GMT

Hi Oliver,

I think that you need to copy the feature as a graphic to GraphicsOverlay and define your custom selection symbol as a symbol for that one. Also you might want to hide the selected feature from the FeatureLayer using featureLayer.SetVisibility method. There is a bit more code involved with this approach but it gives you full control what is shown with what symbols and when.

Re: FeatureLayer.SelectFeature() - Polygon fill symbol (Colorize the area of a polygon)

OliverBrandt2 — Tue, 26 Jan 2016 10:03:23 GMT

Hi Antti,

thanks for your response. Taking the geometry and creating a graphic out of it, is an good approach. I'll try this.

Re: FeatureLayer.SelectFeature() - Polygon fill symbol (Colorize the area of a polygon)

Anonymous User — Tue, 23 Feb 2016 17:46:15 GMT

Hi Oliver,

The following VBA sample is able to set the selection symbol to be solid green:

Public Sub SetSeleSymbol()

Dim pMxDoc As IMxDocument

Set pMxDoc = ThisDocument

Dim pMap As IMap

Set pMap = pMxDoc.FocusMap

Dim pFeatLayer As IFeatureLayer

Set pFeatLayer = pMap.Layer(0)

Dim featSel As IFeatureSelection

Set featSel = pFeatLayer

Dim polySym As ISimpleFillSymbol

Set polySym = New SimpleFillSymbol

Dim pColor1 As IRgbColor

Set pColor1 = New RgbColor

pColor1.Red = 0

pColor1.Green = 250

pColor1.Blue = 0

Dim pcolor2 As IRgbColor

Set pcolor2 = New RgbColor

pcolor2.Red = 0

pcolor2.Green = 0

pcolor2.Blue = 250

Dim pLineSym As ILineSymbol

Set pLineSym = New SimpleLineSymbol

pLineSym.Color = pcolor2

pLineSym.Width = 2

polySym.Color = pColor1

polySym.Outline = pLineSym

featSel.SetSelectionSymbol = True

Set featSel.SelectionSymbol = polySym

End Sub

Results will be like this:

Re: FeatureLayer.SelectFeature() - Polygon fill symbol (Colorize the area of a polygon)

OliverBrandt2 — Thu, 25 Feb 2016 15:09:45 GMT

Thank you! This is an very interesting example, but we are using ArcGIS runtime for .NET.

I worked with Antti's approach.

My Code is:

var color = Color.FromArgb(150,140,235,240);

var selectionColor = new SimpleFillSymbol

{

Color = color

};

var selectedPolygon = GeodatabaseFeature.AsGraphic();

selectedPolygon.Symbol = selectionColor;

_MapView.GraphicsOverlays[PolygonGraphicsOverlayKey].Graphics.Add(selectedPolygon);

At my clearSelection method I clear the PolygonGraphicsOverlay as well. This works very good for me.