UpdateMsByMs Method (IGeometryEngine)

In This Topic

Updates M-values along the shortest path between the specified vertices. The interpolation ratio is determined by the existing M-values along that path and the input M-values.

Syntax

C#
Visual Basic (Declaration)

Polyline UpdateMsByMs( 
   Polyline polyline,
   int fromPartIndex,
   int fromPointIndex,
   int toPartIndex,
   int toPointIndex,
   double fromM,
   double toM,
   UpdateMMethod updateMMethod
)

Function UpdateMsByMs( _
   ByVal polyline As Polyline, _
   ByVal fromPartIndex As Integer, _
   ByVal fromPointIndex As Integer, _
   ByVal toPartIndex As Integer, _
   ByVal toPointIndex As Integer, _
   ByVal fromM As Double, _
   ByVal toM As Double, _
   ByVal updateMMethod As UpdateMMethod _
) As Polyline

Parameters

polyline: The input polyline.
fromPartIndex: The index of the part from which to start.
fromPointIndex: The index of the point (relative to the part) from which to start.
toPartIndex: The index of the part from which to end.
toPointIndex: The index of the point (relative to the part) from which to end.
fromM: The start M-value.
toM: The end M-value.
updateMMethod: The method to use when updating M-values. You can use a combination of update methods by using the bitwise OR operator. For example, to interpolate between the input points and to extrapolate before the input points, useUpdateMMethod.Interpolate | UpdateMMethod.ExtrapolateBefore.

Return Value

A polyline with updated M-values. If the input polyline is empty, then it is returned unchanged.

Exceptions

Exception	Description
System.ArgumentNullException	The input polyline is null.
System.InvalidOperationException	The geometry is not M-Aware.
System.NotImplementedException	The spatial reference is an image coordinate system.
System.ArgumentException	fromPartIndex or fromPointIndex or toPartIndex or toPointIndex is negative.
System.ArgumentException	toPartIndex is less than fromPartIndex.
System.ArgumentException	The extrapolation range is invalid.
System.ArgumentException	fromPartIndex or toPartIndex is greater than or equal to the number of parts in the multipart.
System.ArgumentException	fromPointIndex or toPointIndex is greater than or equal to the number of points in the specified part.

Example

Update M-values with the interpolation ratio determined by existing M-values and the input M-values - UpdateMsByMs

string json = "{\"hasM\":true,\"paths\":[[[-8,2,1],[-8,5,8],[-5,5,0],[-5,7,12]]],\"spatialReference\":{\"wkid\":4326}}";
Polyline polyline = PolylineBuilderEx.FromJson(json);

Polyline outputPolyline = GeometryEngine.Instance.UpdateMsByMs(polyline, 0, 1, 0, 3, -2, 14, UpdateMMethod.Interpolate);
// The xy-coordinates don't change.
// The M-values of the vertices in outputPolyline are (x, y, m): { 1, -2, 30, 14 }

Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3.3 or higher.

Reference

IGeometryEngine Interface
IGeometryEngine Members

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