NonSimpleReason Enumeration

In This Topic

Specifies the reason that a non-simple geometry is non-simple. Returned from GeometryEngine.GetNonSimpleReason. See SimplifyAsFeature and IsSimpleAsFeature Wiki page. Note: This enumeration coincides with ArcObjects esriNonSimpleReasonEnum https://desktop.arcgis.com/en/arcobjects/latest/net/webframe.htm#esriNonSimpleReasonEnum.htm

Syntax

Visual Basic (Declaration)
C#

Public Enum NonSimpleReason 
   Inherits System.Enum
   Implements System.IComparable, System.IConvertible, System.IFormattable, System.ISpanFormattable

public enum NonSimpleReason : System.Enum, System.IComparable, System.IConvertible, System.IFormattable, System.ISpanFormattable

Members

Member	Description
DiscontinuousParts	The geometry contains discontinuous parts.
DuplicateVertex	The geometry has one or more duplicate vertices.
EmptyPart	The geometry contains an empty part.
EmptyZValues	The geometry is z-aware, but one or more z-values are NaN.
IsSimple	The geometry is simple. Applies to all geometry types.
MismatchedAttributes	The geometry has mismatched attributes. All of the points must have the same attribute awareness. For example, if one point is z-aware and another point is not, then it has mismatched attributes.
RingOrientation	The rings of a polygon are oriented incorrectly. Exterior rings must be oriented clockwise, and interior rings must be oriented counterclockwise.
SegmentOrientation	Individual segments are not consistently oriented. The end point of segment(i) must be the same as the start point of segment(i + 1).
SelfIntersections	A path or ring intersects itself or other parts.
ShortSegments	Some segments are shorter than allowed by the system units of the spatial reference associated with the geometry.
UnclosedRing	A ring in a polygon is not closed. The end point of the last segment in a ring must be equal to the start point of the first segment in that ring.
Undetermined	The non-simple reason is unknown.

Example

Get Non Simple Reason

{
    SpatialReference sr = SpatialReferences.WGS84;
    Coordinate2D[] coords = [new Coordinate2D(5, 10), new Coordinate2D(15, 20), new Coordinate2D(25, 10), new Coordinate2D(5, 20)];
    polyline = PolylineBuilderEx.CreatePolyline(coords, sr);

    bool isSimple = GeometryEngine.Instance.GetNonSimpleReason(polyline, out NonSimpleReason nonSimpleReason);
    // isSimple = true;
    // nonSimpleReason = NonSimpleReason.IsSimple

    double resolution = sr.XYResolution;
    coords = [new Coordinate2D(0, 0), new Coordinate2D(0, 1.8 * resolution), new Coordinate2D(10, 10), new Coordinate2D(0, 5)];
    polyline = PolylineBuilderEx.CreatePolyline(coords, sr);

    isSimple = GeometryEngine.Instance.GetNonSimpleReason(polyline, out nonSimpleReason);
    // isSimple = false
    // nonSimpleReason = NonSimpleReason.ShortSegments

    coords = [ new Coordinate2D(10, 10), new Coordinate2D(10, 20), new Coordinate2D(40, 20),
new Coordinate2D(40, 10), new Coordinate2D(60, 10), new Coordinate2D(70, 10)];

    polygon = PolygonBuilderEx.CreatePolygon(coords, sr);

    isSimple = GeometryEngine.Instance.GetNonSimpleReason(polygon, out nonSimpleReason);
    //isSimple = false
    //nonSimpleReason = NonSimpleReason.SelfIntersections
  }

SimplifyOGC

{
  SpatialReference sr = SpatialReferences.WGS84;

  Coordinate2D[] coords = [new Coordinate2D(5, 10), new Coordinate2D(15, 20), new Coordinate2D(25, 10), new Coordinate2D(5, 20)];
  polyline = PolylineBuilderEx.CreatePolyline(coords, sr);
  // polyline.IsKnownSimpleOgc = false
  // polyline.IsKnownSimple = false

  bool isSimple = GeometryEngine.Instance.IsSimpleOgc(polyline, out NonSimpleReason nonSimpleReason, true);
  // isSimple = false
  // nonSimpleReason = NonSimpleReason.SelfIntersections

  Polyline simplePolyline = GeometryEngine.Instance.SimplifyOgc(polyline) as Polyline;
  // simplePolyline.IsKnownSimpleOgc = true
  // simplePolyline.IsKnownSimple = true

  double resolution = sr.XYResolution;
  Coordinate3D[] coords3D = [ new Coordinate3D(0, 0, 0), new Coordinate3D(0, 1.8 * resolution, 0.8 * sr.ZTolerance), new Coordinate3D(10, 10, 1),
new Coordinate3D(0, 5, 1) ];
  polyline = PolylineBuilderEx.CreatePolyline(coords3D, sr);

  isSimple = GeometryEngine.Instance.IsSimpleOgc(polyline, out nonSimpleReason);
  // isSimple = false
  // nonSimpleReason = NonSimpleReason.ShortSegments

  simplePolyline = GeometryEngine.Instance.SimplifyOgc(polyline, true) as Polyline;
  // simplePolyline.IsKnownSimpleOgc = true
  // simplePolyline.IsKnownSimple = true

  coords = [new Coordinate2D(0, 0), new Coordinate2D(0, 0)];
  Multipoint multipoint = MultipointBuilderEx.CreateMultipoint(coords, sr);

  isSimple = GeometryEngine.Instance.IsSimpleOgc(multipoint, out nonSimpleReason);
  // isSimple = false
  // nonSimpleReason = NonSimpleReason.DuplicateVertex
}

Inheritance Hierarchy

System.Object
   System.ValueType
      System.Enum
         ArcGIS.Core.Geometry.NonSimpleReason

Requirements

Target Platforms: Windows 11 Home, Pro, Enterprise (64 bit)

ArcGIS Pro version: 3.2 or higher.

Reference

ArcGIS.Core.Geometry Namespace

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