A portion of a circle that connects two points optionally has measure, height and ID attributes at each endpoint.
A CircularArc is an object that describes a portion of a circle or a complete circle. In geometric terms, a CircularArc is a special case of an EllipticArc, where the major and minor axes are equal. Consequently, every point on the arc is equidistant from the CenterPoint, this distance being the Radius.
Extended Error Information
Use the ISupportErrorInfo method InterfaceSupportsErrorInfo to determine if the object supports extended error information. If the object supports extended error info, VC++ developers should use the OLE/COM IErrorInfo interface to access the ErrorInfo object. Visual Basic developers should use the global error object Err to retrieve this extended error information.
|ICircularArc||Provides access to members that control properties of circular arcs.|
|IClone (esriSystem)||Provides access to members that control cloning of objects.|
|IConstructCircularArc||Provides access to members that construct a circular arc using other geometries and values.|
|IConstructCircularArc2||Provides access to members that construct a circular arc using other geometries and values.|
|ICurve||Provides access to properties and methods of all 1 dimensional curves (polylines, segments, boundaries of polygons, etc.).|
|ICurve2||Provides access to members that extend the functionality of one dimensional curves.|
|ICurve3||Provides access to members that extend the functionality of one dimensional curves.|
|IGeometry||Provides access to members that describe properties and behavior of all geometric objects.|
|IProximityOperator||Provides access to members that find the 2D distance between two geometries.|
|ISegment||Provides access to members that identify a segment. A segment is a way of getting between two endpoints.|
|ISegmentID||Provides access to members that allow simple manipulations of IDs at the segment level.|
|ISegmentM||Provides access to members that allow simple manipulations of Ms at the segment level.|
|ISegmentZ||Provides access to members that allow simple manipulations of Zs at the segment level.|
|ISupportErrorInfo||Indicates whether a specific interface can return Automation error objects.|
|ITransform2D||Provides access to methods for transforming geometries using either specific parameters or arbitrary transformation objects (affine transformations, geographic transformations, etc.).|