ExtrapolateMs Method (IGeometryEngine)

In This Topic

Extrapolates the M-values based on the extrapolate range defined by the input indices.

Syntax

C#
Visual Basic (Declaration)

Multipart ExtrapolateMs( 
   Multipart multipart,
   ExtrapolateMMethod extrapolateMethod,
   int startPartIndex,
   int startPointIndex,
   int endPartIndex,
   int endPointIndex
)

Function ExtrapolateMs( _
   ByVal multipart As Multipart, _
   ByVal extrapolateMethod As ExtrapolateMMethod, _
   ByVal startPartIndex As Integer, _
   ByVal startPointIndex As Integer, _
   ByVal endPartIndex As Integer, _
   ByVal endPointIndex As Integer _
) As Multipart

Parameters

multipart: The multipart to copy and update.
extrapolateMethod: The method to use when extrapolating the M-values. For example, if set to ExtrapolateMMethod.ExtrapolateBefore, then only the points before the start point of the range will be updated.
startPartIndex: The index of the part which contains the start point of the extrapolate range.
startPointIndex: The index of the start point of the extrapolate range. The index is relative to the start part.
endPartIndex: The index of the part which contains the end point of the extrapolate range.
endPointIndex: The index of the end point of the extrapolate range. The index is relative to the end part.

Return Value

An updated version of the input multipart.

Exceptions

Exception	Description
System.ArgumentNullException	The input multipart is null.
System.InvalidOperationException	The HasM property of the input multipart is set to false.
System.NotImplementedException	Spatial reference of multipartis an image coordinate system.
System.ArgumentException	startPartIndex or startPointIndex or endPartIndex or endPointIndex is negative.
System.ArgumentException	endPartIndex is less than startPartIndex.
System.ArgumentException	The extrapolation range is invalid.
System.ArgumentException	startPartIndex or endPartIndex is greater than or equal to the number of parts in the multipart.
System.ArgumentException	startPointIndex or endPointIndex is greater than or equal to the number of points in the specified part.

Example

Extrapolate M-values based on a range defined by part and vertex indices - ExtrapolateMs

string json = "{\"hasM\":true,\"paths\":[[[2,0,50],[2,1,40],[3,1,30],[3,5,60],[7,5,12],[7,1,20],[9,1,28],[9,3,10]]],\"spatialReference\":{\"wkid\":4326}}";
Polyline polyline = PolylineBuilderEx.FromJson(json);

// Extrapolate M-values from part 0, point 3 to part 0, point 5
Polyline outPolyline = GeometryEngine.Instance.ExtrapolateMs(polyline, ExtrapolateMMethod.ExtrapolateBefore, 0, 3, 0, 5) as Polyline;
// The points in outPolyline are (x, y, m):
// ( 2, 0, 90 ), ( 2, 1, 85 ), ( 3, 1, 80 ), ( 3, 5, 60 ), ( 7, 5, 12 ), ( 7, 1, 20 ), ( 9, 1, 28 ), ( 9, 3, 10 )

json = "{\"hasM\":true,\"paths\":[[[2,0,50],[2,1,40],[3,1,30],[3,5,60],[7,5,12],[7,1,20],[9,1,28],[9,3,10]],[[5,-4,-10],[5,-2,-40],[10,-2,-60],[10,-6,-50],[8,-6,-40],[8,-4,-80],[6,-4,-90]]],\"spatialReference\":{\"wkid\":4326}}";
polyline = PolylineBuilderEx.FromJson(json);

// Extrapolate M-values from part 0, point 5 to part1, point 1
outPolyline = GeometryEngine.Instance.ExtrapolateMs(polyline, ExtrapolateMMethod.ExtrapolateAfter, 0, 5, 1, 1) as Polyline;
// The points in part 0 of outPolyline don't change. They are (x, y, m):
// ( 2, 0, 50 ), ( 2, 1, 40 ), ( 3, 1, 30 ), ( 3, 5, 60 ), ( 7, 5, 12 ), ( 7, 1, 20 ), ( 9, 1, 28 ), ( 9, 3, 10 )

// The points in part 1 of outPolyline are (x, y, m):
// ( 5, -4, -10 ), ( 5, -2, -40 ), ( 10, -2, -90 ), ( 10, -6, -130 ), ( 8, -6, -150 ), ( 8, -4, -170 ), ( 6, -4, -190 )

Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3.3 or higher.

Reference

IGeometryEngine Interface
IGeometryEngine Members

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