NearestVertex Method (IGeometryEngine)

In This Topic

Finds the nearest vertex in the geometry to a specified point.

Syntax

C#
Visual Basic (Declaration)

ProximityResult NearestVertex( 
   Geometry geometry,
   MapPoint point
)

Function NearestVertex( _
   ByVal geometry As Geometry, _
   ByVal point As MapPoint _
) As ProximityResult

Parameters

geometry: The geometry.
point: The point to which the returned vertex will be nearest.

Return Value

ProximityResult.

ProximityResult.PointIndex is the index of the nearest vertex.

ProximityResult.SegmentIndex is null.

ProximityResult.PartIndex is the index of the part containing the nearest vertex.

Proximity.RightSide = false.

If either of the input geometries are empty, then ProximityResult.Distance = -1, ProximityResult.Point is empty, ProximityResult.PartIndex = -1, ProximityResult.PointIndex is null, and ProximityResult.SegmentIndex = null.

Exceptions

Exception	Description
System.ArgumentNullException	Either geometry or point or both are null or empty.
System.NotImplementedException	The method is not implemented for GeometryBag.

Example

Nearest Point versus Nearest Vertex

SpatialReference sr = SpatialReferences.WGS84;
MapPoint pt = MapPointBuilderEx.CreateMapPoint(5, 5, sr);

List<Coordinate2D> coords = new List<Coordinate2D>()
{
  new Coordinate2D(10, 1),
  new Coordinate2D(10, -4),
  new Coordinate2D(0, -4),
  new Coordinate2D(0, 1),
  new Coordinate2D(10, 1)
};

Polygon polygon = PolygonBuilderEx.CreatePolygon(coords);

// find the nearest point in the polygon geomtry to the pt
ProximityResult result = GeometryEngine.Instance.NearestPoint(polygon, pt);
// result.Point = 5, 1
// result.SegmentIndex = 3
// result.PartIndex = 0
// result.PointIndex = null
//result.Distance = 4
//result.RightSide = false

// find the nearest vertex in the polgyon geometry to the pt
result = GeometryEngine.Instance.NearestVertex(polygon, pt);
// result.Point = 10, 1
// result.PointIndex = 0
// result.SegmentIndex = null
// result.PartIndex = 0
// result.Distance = Math.Sqrt(41)
// result.RightSide = false

Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.

Reference

IGeometryEngine Interface
IGeometryEngine Members

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