ArcGIS Pro 3.4 API Reference Guide
ArcGIS.Core.Geometry Namespace / EllipticArcBuilderEx Class / CreateEllipse Method
The center point of the ellipse.
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.
The ellipse orientation, clockwise or counterclockwise.
(Optional) The spatial reference of the ellipse. The default value is null.
Example Version

CreateEllipse Method
Convenience method to create a new instance of the EllipticArcSegment class. The segment will be an ellipse.
Syntax

Parameters

centerPt
The center point of the ellipse.
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.
orientation
The ellipse orientation, clockwise or counterclockwise.
spatialReference
(Optional) The spatial reference of the ellipse. The default value is null.

Return Value

Exceptions
ExceptionDescription
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 Ellipse
// Construct an ellipse centered at (1, 2) with rotationAngle = -pi/6,  
// semiMajorAxis = 5, minorMajorRatio = 0.2, oriented clockwise.
// Use a builderEx convenience method or use a builderEx constructor.

Coordinate2D centerPt = new Coordinate2D(1, 2);

// BuilderEx convenience methods don't need to run on the MCT.
EllipticArcSegment ellipse = EllipticArcBuilderEx.CreateEllipse(centerPt, -1 * Math.PI / 6, 5, 0.2, ArcOrientation.ArcClockwise);

// This EllipticArcBuilderEx constructor doesn't need to run on the MCT.
EllipticArcBuilderEx builder = new EllipticArcBuilderEx(centerPt, -1 * Math.PI / 6, 5, 0.2, ArcOrientation.ArcClockwise);
EllipticArcSegment anotherEllipse = builder.ToSegment();
Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.
See Also