IEllipticArc Interface

Provides access to members that control properties of elliptic arc segments.

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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 This method is obsolete.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

Classes that implement IEllipticArc

Remarks

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

See Also

IPoint Interface | IEnvelope Interface | IGeometry Interface | ISegment Interface | IConstructEllipticArc Interface