Polygon creation tool

DavidMrázek — Mon, 15 Nov 2021 07:59:50 GMT

Hello,

I would like to create a tool that finds a hole in a polygon and then loads it into a new layer as a new polygon. Has anyone had a similar project? Somehow I don't know how to start.

With the code written below, I can create a polygon in which the holes are located, but I don't know how to write them to create those holes.

I will be happy for any advice, idea or solution.

protected override async void OnClick() { var polylineFeatureLayer = MapView.Active.Map.GetLayersAsFlattenedList().OfType<FeatureLayer>().FirstOrDefault(lyr => lyr.ShapeType == esriGeometryType.esriGeometryPolyline); if (polylineFeatureLayer == null) return; await CreateFcWithAttributesAsync("Polygon", EnumFeatureClassType.POLYGON); var polygonFeatureLayer = MapView.Active.Map.GetLayersAsFlattenedList().OfType<FeatureLayer>().FirstOrDefault(lyr => lyr.ShapeType == esriGeometryType.esriGeometryPolygon); if (polygonFeatureLayer == null) return; await ConstructSamplePolygon(polygonFeatureLayer, polylineFeatureLayer); } private Task<bool> ConstructSamplePolygon(FeatureLayer polygonLayer, FeatureLayer lineLayer) { return QueuedTask.Run(() => { var polygonFeatureClass = polygonLayer.GetTable() as FeatureClass; var polygonDefinition = polygonFeatureClass.GetDefinition(); var lineFeatureClass = lineLayer.GetTable() as FeatureClass; var lineCursor = lineFeatureClass.Search(null, false); var createOperation = new EditOperation() { Name = "Vytvořit polygon", SelectNewFeatures = false }; while (lineCursor.MoveNext()) { using (var lineFeature = lineCursor.Current as Feature) { var polylineGeometry = lineFeature.GetShape() as Polyline; ReadOnlyPointCollection pts = polylineGeometry.Points; // var polygonBuilder = PolygonBuilder.CreatePolygon(pts, polygonDefinition.GetSpatialReference()); List<MapPoint> lineMapPoints = new List<MapPoint>(); lineMapPoints.AddRange(pts); var newPolygon = PolygonBuilder.CreatePolygon(lineMapPoints, polygonDefinition.GetSpatialReference()); createOperation.Create(polygonLayer, newPolygon); } } return createOperation.ExecuteAsync(); }); }

thank you
David

Re: Polygon creation tool

DanPatterson — Fri, 12 Nov 2021 10:13:17 GMT

A quick tour of creating tools with Python—ArcGIS Pro | Documentation

holes will make the shape multipart

Polygon—ArcGIS Pro | Documentation

Read geometries—ArcGIS Pro | Documentation

if you find holes, then the order of the points needs to be reversed

Re: Polygon creation tool

DavidMrázek — Fri, 12 Nov 2021 10:36:28 GMT

Thank you. Creating a polygon is no problem.

topic Re: Polygon creation tool in ArcGIS Pro Questions

Polygon creation tool

Re: Polygon creation tool

Re: Polygon creation tool