SplitPartAtDistance Method (PolylineBuilderEx)

In This Topic

Introduces a new vertex point to the part specified by at a specified distance from the From point of the curve. For a split to happen, the split distance must be between the From and To points of the part. This method must be called on the MCT. Use QueuedTask.Run.

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: 0 based index of the part. Last part is PartCount - 1.
distance: the distance from the From point 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. The default value is false.

Return Value

The new segment index.

Exceptions

Exception	Description
ArcGIS.Core.CalledOnWrongThreadException	This method or property must be called within the lambda passed to QueuedTask.Run.
System.ArgumentException	The distance is less than zero.

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>();
list.Add(startPt);
list.Add(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 p = polylineBuilder.ToGeometry();
// polyline p 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>();
pts.Add(p1);
pts.Add(p2);
pts.Add(p3);

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

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

// split the 2nd path half way - dont create a new path
polylineBuilder.SplitPartAtDistance(1, 0.5, true, false);

p = polylineBuilder.ToGeometry();

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

Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

Reference

PolylineBuilderEx Class
PolylineBuilderEx Members

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