GeodesicSector Method (IGeometryEngine)
The function returns a piecewise approximation of a geodesic ellipse (or
geodesic circle, if SemiAxis1Length = SemiAxis2Length). Constructs a geodesic
ellipse centered on the specified point. If this method is used to generate
a polygon or a polyline, the result may have more than one part, depending
on the size of the sector and its position relative to the horizon of the
coordinate system. When the method generates a polyline or a multipoint,
the result vertices lie on the boundary of the ellipse. When a polygon is
generated, the interior of the polygon is the interior of the sector, however
the boundary of the polygon may contain segments from the spatial reference
horizon, or from the GCS extent.
Parameters
- parameter
- The geodesic sector parameter that describes how to draw the geodesic sector.
- spatialReference
- The spatial reference of the sector.
Return Value
The geometry that contains sector of the geodesic ellipse.
GeodesicSector
GeodesicSectorParameter param = new GeodesicSectorParameter();
param.ArcVertexCount = 50;
param.AxisDirection = Math.PI / 4;
param.Center = new Coordinate2D(0, 0);
param.LinearUnit = LinearUnit.Meters;
param.OutGeometryType = GeometryType.Polygon;
param.RadiusVertexCount = 10;
param.SectorAngle = 5 * Math.PI / 3;
param.SemiAxis1Length = 100000;
param.SemiAxis2Length = 20000;
param.StartDirection = 11 * Math.PI / 6;
Geometry geometry = GeometryEngine.Instance.GeodesicSector(param, SpatialReferences.WGS84);
// geometry.IsEmpty = false
Polygon polygon = geometry as Polygon;
// polygon.PointCount = 68
// polygon.PartCount = 1
Target Platforms: Windows 11, Windows 10
ArcGIS Pro version: 3.0 or higher.