ArcGIS Enterprise SDK

IEllipticArc Interface

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

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.

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 This method is obsolete.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. |

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 | 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. |

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