Provides access to properties and methods of all 1 dimensional curves (polylines, segments, boundaries of polygons, etc.).
**Note:** the ICurve interface has been superseded byICurve3. Please consider using the more recent version.

#### Product Availability

#### Description

A curve is an abstract one-dimensional geometry between specific From and To points. A curve can be composed of a single Segment, a Path of connected segments, or a Polycurve containing many paths of segments. The properties and methods of the curve allow the user to query information about the entire curve or points along the curve. The distance along the curve can be specified in a fixed unit of measure or as a ratio of the Length of the curve. The user can obtain information about Tangents, Normals, Subcurves, and Points along the curve.

#### Members

Description |
||
---|---|---|

Dimension | The topological dimension of this geometry. | |

Envelope | Creates a copy of this geometry's envelope and returns it. | |

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 This method is obsolete. | |

GetSubcurve | Extracts a portion of this curve into a new curve. | |

IsClosed | Indicates if 'from' and 'to' points (of each part) are identical. | |

IsEmpty | Indicates whether this geometry contains any points. | |

Length | The length of the curve. | |

Project | Projects this geometry into a new spatial reference. | |

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. | |

ToPoint | The 'to' point of the curve. |

#### Inherited Interfaces

Interfaces | Description |
---|---|

IGeometry | Provides access to members that describe properties and behavior of all geometric objects. |

#### CoClasses that implement ICurve

CoClasses and Classes | Description |
---|---|

BezierCurve | A cubic Bezier curve defined between two points; optionally has measure, height and ID attributes at each endpoint. |

CircularArc | A portion of a circle that connects two points optionally has measure, height and ID attributes at each endpoint. |

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

GeoEllipse (esriDefenseSolutions) | Its a spheroidal ellipse. |

GeoPolygon (esriDefenseSolutions) | Its a spheroidal polygon. |

GeoPolyline (esriDefenseSolutions) | This is a spheroidal polyline. |

Line | A 2D straight line between a pair of 2D endpoints; can optionally have height, measure and ID attributes at each endpoint. |

Path | A sequence of connected segments. |

Polygon | A collection of rings ordered by their containment relationship; optionally has measure, height and ID attributes. |

Polyline | An ordered collection of paths; optionally has measure, height and ID attributes. |

Ring | An area bounded by one, closed sequence of connected segments; optionally has measure, height and ID attributes at each vertex. |

//The example shows how to get the ICurve properties of a polygon feature

public void GetCurveProperties(IFeature currentFeature)

{

if (currentFeature.Shape.GeometryType == esriGeometryType.esriGeometryPolygon)

{

ICurve curve = currentFeature.Shape as ICurve;

System.Windows.Forms.MessageBox.Show("Polygon::ICurve properties..." + "\n" +

"Curve.Length = " + curve.Length + "\n" +

"Curve.IsClosed = " + curve.IsClosed + "\n" +

"Curve.FromPoint.X = " + curve.FromPoint.X + "\n" +

"Curve.FromPoint.Y = " + curve.FromPoint.Y + "\n" +

"Curve.ToPoint.X = " + curve.ToPoint.X + "\n" +

"Curve.ToPoint.Y = " + curve.ToPoint.Y

);

}

}

' The example shows how to get the ICurve properties of a polygon feature

Public Sub t_ICurve_polygon(ByVal pFeature As IFeature)

Dim pCurve As ICurve

If pFeature.Shape.GeometryType = esriGeometryType.esriGeometryPolygon Then

pCurve = pFeature.Shape

MsgBox("+++Polygon::ICurve properties..." & vbCrLf _

& "Curve.Length = " & pCurve.Length & vbCrLf _

& "Curve.IsClosed = " & pCurve.IsClosed _

& "Curve.FromPoint.X = " & pCurve.FromPoint.X & vbCrLf _

& "Curve.FromPoint.Y = " & pCurve.FromPoint.Y & vbCrLf _

& "Curve.ToPoint.X = " & pCurve.ToPoint.X & vbCrLf _

& "Curve.ToPoint.Y = " & pCurve.ToPoint.Y)

End If

End Sub

#### See Also

IPoint Interface | IGeometry Interface | ICircularArc Interface | ISegment Interface | ILine Interface | IBezierCurve Interface | IEllipticArc Interface | IRing Interface | IPath Interface | IPolygon Interface | IPolycurve Interface | IPolyline Interface | IPolycurve2 Interface