GetPointsAtM Method (GeometryEngine)

In This Topic

Gets a multipoint corresponding to the locations along the multipart where the specified M value occurs. Coordinates/measures are interpolated when appropriate.

Syntax

C#
Visual Basic (Declaration)

public Multipoint GetPointsAtM( 
   Multipart multipart,
   double mValue,
   double offset
)

Public Function GetPointsAtM( _
   ByVal multipart As Multipart, _
   ByVal mValue As Double, _
   ByVal offset As Double _
) As Multipoint

Parameters

multipart: The multipart from which the locations will be extracted.
mValue: The M value to locate.
offset: The lateral offset of the output points.

Return Value

Multipoint representing the locations found.

Exceptions

Exception	Description
System.ArgumentNullException	Multipart is null or empty.
System.InvalidOperationException	This geometry is not M-Aware.
System.NotImplementedException	Spatial reference of multipartis an image coordinate system.

Example

Get a multipoint corresponding to the locations where the specified M values occur along the geometry - GetPointsAtM

string json = "{\"hasM\":true,\"paths\":[[[-3000,-2000,10],[-2000,-2000,15],[-1000,-2000,20],[0,-2000,0],[1000,-2000,20],[2000,-2000,30],[3000,-2000,10],[4000,-2000,5]]],\"spatialReference\":{\"wkid\":3857}}";
Polyline polyline = PolylineBuilderEx.FromJson(json);

Multipoint multipoint = GeometryEngine.Instance.GetPointsAtM(polyline, 10, 500);
// multiPoint.PointCount = 4
// multipoint.Points[0]  X= -3000, Y= -2500  M= 10
// multipoint.Points[1]  X= -500, Y= -2500  M= 10
// multipoint.Points[2]  X= 500, Y= -2500  M= 10
// multipoint.Points[3]  X= 3000, Y= -2500  M= 10

Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

Reference

GeometryEngine Class
GeometryEngine Members

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