Dividing the line by points

DavidMrázek

Hi,

I want to ask if it is possible to split a polyline without creating a new FeatureLayer? I have a Polygon boundary (rectangle) redesigned to PolyLine and a Point on every corner, and I would like to divide Polyline by these points.

 await QueuedTask.Run(() =>
            {
                var minX = "ExtentMinX";
                var minY = "ExtentMinY";
                var maxX = "ExtentMaxX";
                var maxY = "ExtentMaxY";
                FeatureClass listFc = lyrList.GetTable() as FeatureClass;
                var polyCursor = fc.Search(queryFilter);
                cps.Progressor.Max = (uint) steps;
                cps.Progressor.Message = "Probíhá ";
                var centerPoint = new List<MapPoint>();
                Dictionary<string, object> attributes = new Dictionary<string, object>();
                List<string> side = new List<string>() {"Dolni", "Levá", "Horní", "Pravá"};
                object[] extentMinX = {"ExtentMinX EXTENT_MIN_X"};
                object[] extentMinY = {"ExtentMinY EXTENT_MIN_Y"};
                object[] extentMaxX = {"ExtentMaxX EXTENT_MAX_X"};
                object[] extentMaxY = {"ExtentMaxY EXTENT_MAX_Y"};
                object[] extent = {extentMinX, extentMinY, extentMaxX, extentMaxY};
                object[] listParameter = {lyrList, extent};
                StartATask("management.CalculateGeometryAttributes", listParameter);
                while (polyCursor.MoveNext() && !cps.Progressor.CancellationToken.IsCancellationRequested)
                {
                    cps.Progressor.Value += 1;
                    cps.Progressor.Status = cps.Progressor.Value + @" z " + cps.Progressor.Max + @" hotovo.";
                    var polygons = new List<Polygon>();
                    var editOperation = new EditOperation();
                    var polyFeature1 = polyCursor.Current as Feature;
                    var oid = polyCursor.Current.GetObjectID();
                    var polygonGeometry1 = polyFeature1.GetShape() as Polygon;
                    Row row = polyCursor.Current;
                    var pointMinX = (double) row[minX];
                    var pointMinY = (double) row[minY];
                    var pointMaxX = (double) row[maxX];
                    var pointMaxY = (double) row[maxY];
                    TableDefinition tableDefinition = listFc.GetDefinition();
                    int nameIndex = tableDefinition.FindField(text);
                    string nameNom = row.GetOriginalValue(nameIndex) as String;
                    var polylineBorder = new PolylineBuilder(polygonGeometry1).ToGeometry();//I would like to divide this Polyline.                                   
                    MapPointBuilder minPoint = new MapPointBuilder(pointMinX, pointMinY,
                        SpatialReferenceBuilder.CreateSpatialReference(5514));
                    MapPoint mPoint = minPoint.ToGeometry() as MapPoint;
                    MapPointBuilder midPoint = new MapPointBuilder(pointMinX, pointMaxY,
                        SpatialReferenceBuilder.CreateSpatialReference(5514));
                    MapPoint midlePoint = midPoint.ToGeometry() as MapPoint;
                    MapPointBuilder maxPoint = new MapPointBuilder(pointMaxX, pointMaxY,
                        SpatialReferenceBuilder.CreateSpatialReference(5514));
                    MapPoint mxPoint = maxPoint.ToGeometry() as MapPoint;
                    MapPointBuilder midxPoint = new MapPointBuilder(pointMaxX, pointMinY,
                        SpatialReferenceBuilder.CreateSpatialReference(5514));
                    MapPoint mixPoint = midxPoint.ToGeometry() as MapPoint;
                    List<MapPoint> pointsBorder = new List<MapPoint>() {mPoint, midlePoint, mxPoint, mixPoint};//Divided by these points.

 

I know about the SplitLineAtPoint division, but a new FeatureClass is being created there.

 

I will be happy for any advice or idea.

 

David

DavidMrázek

I would like to get geometries for which I would then create a Centroid. But when I do SplitAtPoint and insert points gradually, the same line as the original is created.

List<MapPoint> pointsBorder = new List<MapPoint>() { mPoint, midlePoint, mxPoint, mixPoint };
                    bool splitOccurred;
                    int partIndex;
                    int segmentIndex;
                    splitOccurred = true;
                    partIndex = 1;
                    segmentIndex = 0;
                    foreach (var pointBorder in pointsBorder)
                    {
                       var  splitMethod = GeometryEngine.Instance.SplitAtPoint(polylineBorder, pointBorder, false, false, out splitOccurred, out partIndex, out segmentIndex);
                        var mapPointCentroid = GeometryEngine.Instance.Centroid(splitMethod);
                        centerPoint.Add(mapPointCentroid);
                    }
attributes[field] = nameNom;
                    foreach (var aMapPoint in centerPoint)
                    {
                        attributes["SHAPE"] = aMapPoint;
                        attributes[attribute] = side[index];
                        index++;
                        createOperation.Create(points, attributes);
                    }

                    createOperation.Execute();

It looks like this:

and should more or less look like this: