ArcGIS Pro 3.3 API Reference Guide
ArcGIS.Core.Geometry Namespace / GeometryEngine Class / ReverseOrientation Method
The polygon or polyline whose orientation will be reversed.

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    ReverseOrientation Method (GeometryEngine)
    In This Topic
    Reverse the orientation of the geometry.
    public Multipart ReverseOrientation( 
       Multipart multipart
    Public Function ReverseOrientation( _
       ByVal multipart As Multipart _
    ) As Multipart


    The polygon or polyline whose orientation will be reversed.

    Return Value

    A geometry whose directionality has been reversed. If the input multipart is empty, then it is returned unchanged.
    Multipart is null.
    ReverseOrientation changes the direction of the curve without changing the spatial position of the curve. The From Point and To Point of each Segment are interchanged.
    Caution should be taken in using ReverseOrientation on Polygons. Since ReverseOrientation changes the direction of each Ring within the Polygon, all Exterior Rings become Interior Rings and vice versa.

    GeometryEngine Reverse Orientation

    Reverse the order of points in a Polygon
    List<Coordinate2D> list2D = new List<Coordinate2D>();
    list2D.Add(new Coordinate2D(1.0, 1.0));
    list2D.Add(new Coordinate2D(1.0, 2.0));
    list2D.Add(new Coordinate2D(2.0, 2.0));
    list2D.Add(new Coordinate2D(2.0, 1.0));
    Polygon polygon = PolygonBuilderEx.CreatePolygon(list2D);
    Geometry g = GeometryEngine.Instance.ReverseOrientation(polygon);
    Polygon gPolygon = g as Polygon;
    // gPolygon.Points[0] = 1.0, 1.0
    // gPolygon.Points[1] = 2.0, 1.0
    // gPolygon.Points[2] = 2.0, 2.0
    // gPolygon.Points[3] = 1.0, 2.0
    // gPolygon.Points[4] = 1.0, 1.0
    // gPolygon.Area = -1 * polygon.Area

    Target Platforms: Windows 11, Windows 10

    ArcGIS Pro version: 3 or higher.
    See Also