PolygonBuilderEx Constructor(IEnumerable<Coordinate2D>,SpatialReference)

In This Topic

Initializes a new instance of the PolygonBuilderEx class.

Syntax

C#
Visual Basic (Declaration)

public PolygonBuilderEx( 
   IEnumerable<Coordinate2D> coordinate2Ds,
   SpatialReference spatialReference
)

Public Function New( _
   ByVal coordinate2Ds As IEnumerable(Of Coordinate2D), _
   Optional ByVal spatialReference As SpatialReference _
)

Parameters

coordinate2Ds: Coordinates for the first ring. Line segments are constructed from the coordinates.
spatialReference: (Optional) The SpatialReference. The default value is null.

Exceptions

Exception	Description
System.ArgumentNullException	The input coordinates enumeration 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, Windows 10, Windows 8.1

Reference

PolygonBuilderEx Class
PolygonBuilderEx Members
Overload List

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