﻿ IEllipticArc Interface
ArcGIS Enterprise SDK
IEllipticArc Interface
 ArcGIS Enterprise SDK Developer Help > ArcGIS Enterprise SDK API Reference > ArcGIS Enterprise SDK .NET Namespaces > ESRI.ArcGIS.Geometry > Interfaces > IE > IEllipticArc Interface
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# IEllipticArc Interface

#### Description

An Elliptic Arc is an object that describes any portion of an ellipse.  The Major axis of the Elliptic Arc is the largest axis spanning between points on opposite sides of the ellipse.  The Minor axis is the perpendicular bisector of the Major axis.  Together, the Major and Minor axes determine the full ellipse on which the Elliptic Arc is generated.  These parameters may also be specified in terms of the semi-Major axis (half of the Major axis) and the MinorMajorRatio (the ratio of the Minor axis to the Major axis).  The ellipse may also be rotated.  Rotation is described by the Rotation Angle.  However, the effect of the Rotation Angle depends on the value of EllipseStd.  If EllipseStd is TRUE, all angles and axes are calculated with respect to the Major Axis as though the Major Axis was at 0 radians.  Also, the location of the From Point and To Point are given relative to the Center Point as though it is the origin.  If EllipseStd is FALSE, all angles are caluclated in standard Cartesian coordinates.  The portion of the complete ellipse represented by the Elliptic Arc is determined by the From Angle and Central Angle, both measured in radians.

#### Members

Name Description CenterPoint The center point of the arc. CentralAngle The included (or central) angle. Complement Changes this ellipse into its complement; 'from' and 'to' points are unchanged. Dimension The topological dimension of this geometry. Envelope Creates a copy of this geometry's envelope and returns it. FromAngle The start angle (measured from a horizontal line through the center point) defining where the arc starts. FromPoint The 'from' point of the curve. GeometryType The type of this geometry. GeoNormalize Shifts longitudes, if need be, into a continuous range of 360 degrees. GeoNormalizeFromLongitude Normalizes longitudes into a continuous range containing the longitude. This method is obsolete. GetAxes Gets the semi-major and semi-minor axes. GetSubcurve Extracts a portion of this curve into a new curve. IsCircular Indicates if this elliptical arc is acutally circular (major and minor axes same length). IsClosed Indicates if 'from' and 'to' points (of each part) are identical. IsCounterClockwise Indicates if this elliptic arc is oriented counter-clockwise from its 'from' point to its 'to' point. IsEmpty Indicates whether this geometry contains any points. IsLine Indicates if the arc is degenerated to a line. IsMinor Indicates whether the arc is a minor arc or a major arc. IsPoint Indicates if the arc is degenerated to a point. Length The length of the curve. Project Projects this geometry into a new spatial reference. PutAxes Sets the semi-major and semi-minor axes. PutCoords Sets the center point and endpoints, angle of rotation, and orientation. PutCoordsByAngle Sets the center point, starting angle, signed central angle, angle of rotation, ratio of the minor axis to the major axis, and axes. QueryCenterPoint Copies the center of this arc to the input point. QueryCoords Copies the center and endpoints, angle of rotation, orientation and major/minor properties into the method parameters. QueryCoordsByAngle Returns the center point, starting angle, signed central angle, angle of rotation, ratio of the minor axis to the major axis, and axes. QueryEnvelope Copies this geometry's envelope properties into the specified envelope. QueryFromPoint Copies this curve's 'from' point to the input point. QueryNormal Constructs a line normal to a curve from a point at a specified distance along the curve. QueryPoint Copies to outPoint the properties of a point on the curve at a specified distance from the beginning of the curve. QueryPointAndDistance Finds the point on the curve closest to inPoint, then copies that point to outPoint; optionally calculates related items. QueryTangent Constructs a line tangent to a curve from a point at a specified distance along the curve. QueryToPoint Copies the curve's 'to' point into the input point. ReverseOrientation Reverses the parameterization of the curve ('from' point becomes 'to' point, first segment becomes last segment, etc). SetEmpty Removes all points from this geometry. SnapToSpatialReference Moves points of this geometry so that they can be represented in the precision of the geometry's associated spatial reference system. SpatialReference The spatial reference associated with this geometry. ToAngle The end angle (measured from a horizontal line through the center point) defining where the arc ends. ToPoint The 'to' point of the curve.

#### Inherited Interfaces

Interfaces Description
ICurve Provides access to properties and methods of all 1 dimensional curves (polylines, segments, boundaries of polygons, etc.).
IGeometry Provides access to members that describe properties and behavior of all geometric objects.

#### Classes that implement IEllipticArc

Classes Description
EllipticArc A portion of the boundary of a 2D ellipse that connects two points; optionally has measure, height and ID attributes at each endpoint.

#### Remarks

A CircularArc is a special case of an EllipticArc where the MinorMajorRatio is 1 (however, a CircularArc is NOT an EllipticArc). 