GetMsAtDistance Method (IGeometryEngine)

In This Topic

Get the M-values at the specified distance along the multipart. Two M-values can be returned if the specified distance is exactly at the beginning or the ending of a part.

Syntax

C#
Visual Basic (Declaration)

void GetMsAtDistance( 
   Multipart multipart,
   double distance,
   AsRatioOrLength asRatioOrLength,
   out double mValue1,
   out double mValue2
)

Sub GetMsAtDistance( _
   ByVal multipart As Multipart, _
   ByVal distance As Double, _
   ByVal asRatioOrLength As AsRatioOrLength, _
   ByRef mValue1 As Double, _
   ByRef mValue2 As Double _
)

Parameters

multipart: The multipart from which to get the M-values.
distance: The distance along the multipart to retrieve the M-values.
asRatioOrLength: Indicates whether the distance should be interpreted as length or ratio along the multipart.
mValue1: The M-value at the specified distance.
mValue2: The second M-value, if there is one. If the specified distance is not at the beginning or the ending of a part, then this value is NaN.

Exceptions

Exception	Description
System.ArgumentNullException	The input multipart is null.
System.InvalidOperationException	The input multipart is not M-Aware.

Remarks

If the input multipart is empty, then both mValue1 and mValue2 are NaN.

Example

Get the M values at the specified distance along the multipart

string json = "{\"hasM\":true,\"paths\":[[[-3000,-2000,-3],[-2000,-2000,-2]],[[-2000,-2000,1],[-2000,1000,2]]],\"spatialReference\":{\"wkid\":3857}}";
Polyline polyline = PolylineBuilderEx.FromJson(json);
      
// polyline has 2 parts

double m1, m2;
GeometryEngine.Instance.GetMsAtDistance(polyline, 0, AsRatioOrLength.AsLength, out m1, out m2);
// m1 = -3
// m2 = NaN

GeometryEngine.Instance.GetMsAtDistance(polyline, 500, AsRatioOrLength.AsLength, out m1, out m2);
// m1 = -2.5
// m2 = NaN

GeometryEngine.Instance.GetMsAtDistance(polyline, 1000, AsRatioOrLength.AsLength, out m1, out m2);
// m1 = -2
// m2 = 1     // m2 has a value because distance 1000 is at the end of the first part, beginning of the second part

Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.

Reference

IGeometryEngine Interface
IGeometryEngine Members

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