ArcGIS Pro 3.0 API Reference Guide
ArcGIS.Core.Geometry Namespace / EllipticArcBuilderEx Class / EllipticArcBuilderEx Constructor / EllipticArcBuilderEx Constructor(MapPoint,Double,Double,Double,ArcOrientation,MinorOrMajor,SpatialReference)
The point from which the arc starts.
The length of the chord connecting start point to the end point of the arc.
The angle in radians of the chord connecting the start point to the end point of the arc.
The radius of the embedded circle.
The orientation of the arc, clockwise or counterclockwise.
Indicates whether the arc is a minor or major arc. A minor arc is an arc such that the central angle is less than PI radians.
(Optional) The spatial reference of the arc. The default value is null. The spatial reference of the start point is ignored.
Example

EllipticArcBuilderEx Constructor(MapPoint,Double,Double,Double,ArcOrientation,MinorOrMajor,SpatialReference)
Creates a new instance of the EllipticArcBuilderEx class. The new instance will be a circular arc.
Syntax

Parameters

startPt
The point from which the arc starts.
chordLength
The length of the chord connecting start point to the end point of the arc.
chordBearing
The angle in radians of the chord connecting the start point to the end point of the arc.
radius
The radius of the embedded circle.
orientation
The orientation of the arc, clockwise or counterclockwise.
minorOrMajor
Indicates whether the arc is a minor or major arc. A minor arc is an arc such that the central angle is less than PI radians.
spatialReference
(Optional) The spatial reference of the arc. The default value is null. The spatial reference of the start point is ignored.
Exceptions
Example
Construct a Circular Arc - using a chord length and bearing
// Construct a circular arc counterclockwise from (2, 1) to (1, 2) such that the embedded 
// circle has center point at (1, 1) and radius = 1.
// Use a builderEx convenience method or use a builderEx constructor.

MapPoint fromPt = MapPointBuilderEx.CreateMapPoint(2, 1, SpatialReferences.WGS84);
double chordLength = Math.Sqrt(2);
double chordBearing = 3 * Math.PI / 4;
double radius = 1;
ArcOrientation orientation = ArcOrientation.ArcCounterClockwise;
MinorOrMajor minorOrMajor = MinorOrMajor.Minor;

// BuildeExr convenience methods don't need to run on the MCT.
EllipticArcSegment circularArc = EllipticArcBuilderEx.CreateCircularArc(fromPt, chordLength, chordBearing, radius, orientation, minorOrMajor);

// BuilderEx constructors need to run on the MCT.
EllipticArcBuilderEx cab = new EllipticArcBuilderEx(fromPt, chordLength, chordBearing, radius, orientation, minorOrMajor);
// do something with the builder

EllipticArcSegment anotherCircularArc = cab.ToSegment();
Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

ArcGIS Pro version: 3.0 or higher.
See Also