AddPart(IEnumerable<Coordinate2D>) Method

In This Topic

Adds a part constructed by creating line segments from the enumeration of coordinates. The part will be added to the end of the Parts list.

Syntax

Visual Basic (Declaration)
C#

Public Overloads Sub AddPart( _
   ByVal coordinates As IEnumerable(Of Coordinate2D) _
)

public void AddPart( 
   IEnumerable<Coordinate2D> coordinates
)

Parameters

coordinates: An enumeration of coordinates.

Exceptions

Exception	Description
System.ArgumentNullException	coordinates is null.

Example

Build a donut polygon

{
  List<Coordinate2D> outerCoordinates = new List<Coordinate2D>();
  outerCoordinates.Add(new Coordinate2D(10.0, 10.0));
  outerCoordinates.Add(new Coordinate2D(10.0, 20.0));
  outerCoordinates.Add(new Coordinate2D(20.0, 20.0));
  outerCoordinates.Add(new Coordinate2D(20.0, 10.0));

  // define the inner polygon as anti-clockwise
  List<Coordinate2D> innerCoordinates = new List<Coordinate2D>();
  innerCoordinates.Add(new Coordinate2D(13.0, 13.0));
  innerCoordinates.Add(new Coordinate2D(17.0, 13.0));
  innerCoordinates.Add(new Coordinate2D(17.0, 17.0));
  innerCoordinates.Add(new Coordinate2D(13.0, 17.0));

  PolygonBuilderEx pbEx = new PolygonBuilderEx(outerCoordinates);
  Polygon donutEx = pbEx.ToGeometry() as Polygon;
  double areaEx = donutEx.Area;       // area = 100

  pbEx.AddPart(innerCoordinates);
  donutEx = pbEx.ToGeometry() as Polygon;

  areaEx = donutEx.Area;    // area = 84.0

  areaEx = GeometryEngine.Instance.Area(donutEx);    // area = 84.0
}

Requirements

Target Platforms: Windows 11 Home, Pro, Enterprise (64 bit)

ArcGIS Pro version: 3.0 or higher.

Reference

MultipartBuilderEx Class
MultipartBuilderEx Members
Overload List

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