ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Core.Geometry Namespace / EllipticArcBuilderEx Class / CreateEllipticArcSegment Method / CreateEllipticArcSegment(Coordinate2D,Double,Double,Double,Double,Double,SpatialReference) Method
The center point of the ellipse.
The start angle in radians measured from the rotated X-axis.
The central angle in radians measuring the span of the arc from startAngle to endAngle. A positive value corresponds to counterclockwise orientation.
The angle in radians by which the ellipse is rotated from the X-axis. A positive value corresponds to counterclockwise rotation.
The length of the semi-major axis.
The ratio of the length of the semi-minor axis to the length of the semi-major axis. The absolute value must be <= 1.
(Optional) The spatial reference of the arc. The default value is null.
Example Version

CreateEllipticArcSegment(Coordinate2D,Double,Double,Double,Double,Double,SpatialReference) Method
Convenience method to create a new instance of the EllipticArcSegment class. The new instance will be an elliptic arc.
Syntax

Parameters

centerPt
The center point of the ellipse.
startAngle
The start angle in radians measured from the rotated X-axis.
centralAngle
The central angle in radians measuring the span of the arc from startAngle to endAngle. A positive value corresponds to counterclockwise orientation.
rotationAngle
The angle in radians by which the ellipse is rotated from the X-axis. A positive value corresponds to counterclockwise rotation.
semiMajorAxis
The length of the semi-major axis.
minorMajorRatio
The ratio of the length of the semi-minor axis to the length of the semi-major axis. The absolute value must be <= 1.
spatialReference
(Optional) The spatial reference of the arc. The default value is null.

Return Value

Exceptions
ExceptionDescription
startAngle, centralAngle, rotationAngle, semiMajorAxis or minorMajorRatio is NaN.
An elliptic arc construction operation was given invalid axes. The absolute value of minorMajorRatio is > 1.
centerPt is empty.
Remarks
If minorMajorRatio is equal to one, then a circular arc will be created and the rotation angle will be equal to zero.
Example
Construct an Elliptic Arc - using a center point and rotation angle
// Construct an elliptic arc centered at (1,1), startAngle = 0, centralAngle = PI/2, 
// rotationAngle = 0, semiMajorAxis = 1, minorMajorRatio = 0.5.
// Use a builderEx convenience method or use a builderEx constructor.

Coordinate2D centerPt = new Coordinate2D(1, 1);

// BuilderEx convenience methods don't need to run on the MCT.
EllipticArcSegment circularArc = EllipticArcBuilderEx.CreateEllipticArcSegment(centerPt, 0, Math.PI / 2, 0, 1, 0.5);

double semiMajor;
double semiMinor;
circularArc.GetAxes(out semiMajor, out semiMinor);
// semiMajor = 1, semiMinor = 0.5

// BuilderEx constructors don't need to run on the MCT.
EllipticArcBuilderEx cab = new EllipticArcBuilderEx(centerPt, 0, Math.PI / 2, 0, 1, 0.5);
cab.GetAxes(out semiMajor, out semiMinor);
EllipticArcSegment otherCircularArc = cab.ToSegment();
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also