ArcGIS Pro 3.3 API Reference Guide
ArcGIS.Core.Geometry Namespace / IGeometryEngine Interface / ExtrapolateMs Method
The multipart to copy and update.
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.
The index of the part which contains the start point of the extrapolate range.
The index of the start point of the extrapolate range. The index is relative to the start part.
The index of the part which contains the end point of the extrapolate range.
The index of the end point of the extrapolate range. The index is relative to the end part.
Example

In This Topic
    ExtrapolateMs Method (IGeometryEngine)
    In This Topic
    Extrapolates the M-values based on the extrapolate range defined by the input indices.
    Syntax

    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
    ExceptionDescription
    The input multipart is null.
    The HasM property of the input multipart is set to false.
    Spatial reference of multipartis an image coordinate system.
    startPartIndex or startPointIndex or endPartIndex or endPointIndex is negative.
    endPartIndex is less than startPartIndex.
    The extrapolation range is invalid.
    startPartIndex or endPartIndex is greater than or equal to the number of parts in the multipart.
    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.
    See Also