Fill hole in polygon

DavidMrázek

Hi,
I'm trying to find and fill holes in polygons.

This is how I look for holes:

 

private async Task EditHole(FeatureLayer polygonLayer, QueryFilter queryFilter)
        {
            await QueuedTask.Run(() =>
            {
                var list = new List<Polygon>();
                ReadOnlySegmentCollection seg = null;
                var polygonFeatureClass = polygonLayer.GetTable() as FeatureClass;
                var polygonDefinition = polygonFeatureClass.GetDefinition();
                var rowCursor = polygonFeatureClass.Search(queryFilter);
                while (rowCursor.MoveNext())
                {
                    using (var lineFeature = rowCursor.Current as Feature)
                    {
                        var polygonGeometry = lineFeature.GetShape() as Polygon;
                        IEnumerator<ReadOnlySegmentCollection> segments = polygonGeometry.Parts.GetEnumerator();
                        while (segments.MoveNext())
                        {
                            //I do not know what to do
                           
                        }
                    }
                }
               
            });
        }

 

 

For example, a polygon like this:

 

Would anyone have an idea or advice on how to do this?

Is there any way to distinguish between the outer and inner polygon?

 

Thank you for any advice and help

David

DanPatterson

the outer ring should be the first part, the inner rings follow for singlepart shapes with holes

or an oft used method is to calculate the area for the bits using the "shoelace formula"... clockwise oriented outer rings yield a negative area and ccw inner rings yield a positive area