SplitPartAtDistance Method

In This Topic

Introduces a new vertex to the part specified by at a specified distance from the start point of the first segment in the part. For a split to happen, the split distance must be between the start and end points of the part.

Syntax

C#
Visual Basic (Declaration)

public int SplitPartAtDistance( 
   int partIndex,
   double distance,
   bool asRatio,
   bool createPart
)

Public Function SplitPartAtDistance( _
   ByVal partIndex As Integer, _
   ByVal distance As Double, _
   ByVal asRatio As Boolean, _
   Optional ByVal createPart As Boolean _
) As Integer

Parameters

partIndex: Zero-based index of the part to split. Last part is PartCount - 1.
distance: The distance from the start point of the part to insert the vertex.
asRatio: True to treat the distance as a ratio (or %) of the part length.
createPart: (Optional) Specifies whether a new part is to be created when the part is split. For polygons, it is always set to false. The default value is false.

Return Value

The index of the segment that was split. It is relative to the part. If the split didn't happen, -1 is returned.

Exceptions

Exception	Description
System.ArgumentException	The distance is less than zero or is greater than the length of the multipart.

Example

Split Polyline at distance

// create list of points
MapPoint startPt = MapPointBuilderEx.CreateMapPoint(1.0, 1.0);
MapPoint endPt = MapPointBuilderEx.CreateMapPoint(2.0, 1.0);

List<MapPoint> list = new List<MapPoint>() { startPt, endPt };

// BuilderEx constructors don't need to run on the MCT.

// use the PolylineBuilder as we wish to manipulate the geometry
// use AttributeFlags.None as we have 2D points
PolylineBuilderEx polylineBuilder = new PolylineBuilderEx(list, AttributeFlags.None);
// split at a distance 0.75
polylineBuilder.SplitAtDistance(0.75, false);
// get the polyline
Polyline polyline = polylineBuilder.ToGeometry();
// polyline should have 3 points  (1,1), (1.75, 1), (2,1)

// add another path
MapPoint p1 = MapPointBuilderEx.CreateMapPoint(4.0, 1.0);
MapPoint p2 = MapPointBuilderEx.CreateMapPoint(6.0, 1.0);
MapPoint p3 = MapPointBuilderEx.CreateMapPoint(7.0, 1.0);
List<MapPoint> pts = new List<MapPoint>() { p1, p2, p3 };

polylineBuilder.AddPart(pts);
polyline = polylineBuilder.ToGeometry();

// polyline has 2 parts. Each part has 3 points

// split the 2nd path half way - don't create a new path
polylineBuilder.SplitPartAtDistance(1, 0.5, true, false);

polyline = polylineBuilder.ToGeometry();

// polyline still has 2 parts; but now has 7 points

Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3.1 or higher.

Reference

MultipartBuilderEx Class
MultipartBuilderEx Members

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