Provides access to members that identify and add behavior to a polyline object.
**Note:** the IPolyline interface has been superseded byIPolyline5. Please consider using the more recent version.

#### Product Availability

#### Description

A polyline is a collection of one or many paths. The paths do not have to be connected to each other. A polyline can be defined either as a PointCollection, SegmentCollection, or GeometryCollection. Each collection type allows the user to access and manipulate different aspects of the polyline geometry.

#### Members

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

Densify | Converts this polycurve into a piecewise linear approximation of itself. | |

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. | |

Generalize | Generalizes this polycurve using the Douglas-Poiker algorithm. | |

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 This method is obsolete.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. | |

Reshape | Modifies this polyline by replacing some of its segments with some segments from reshapeSource. | |

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. | |

SimplifyNetwork | Removes zero length segments (zero in 2 dimensions), merges parts at endpoints that only connect to each other, reorients segments that are pointing against the prevailing orientation for a part. | |

Smooth | Converts this curve into a smooth curve containing only Bezier curve segments. | |

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. | |

SplitAtDistance | Introduces a new vertex into this polyline at a specified distance from the beginning of the polyline. | |

SplitAtPoint | Introduces a new vertex into this polyline at the location on it closest to the input point. | |

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

Weed | Generalizes using a small tolerance based upon either the system units of the geometry's spatial reference, or the geometry's bounding box. |

#### Inherited Interfaces

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

IPolycurve | Provides access to members that define operations common to polylines and the boundaries of polygons. |

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. |

#### CoClasses that implement IPolyline

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

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

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

#### Remarks

To define a polyline containing many disjoint paths, the polyline must be defined as a GeometryCollection to which preconstructed path geometries are added. Adding segments to a polyline defined as a SegmentCollection, or points to a polyline defined as a PointCollection, assumes that the polyline is a single path of connected segments.

#### See Also

IGeometry Interface | IPolycurve Interface | IPath Interface | ISegmentCollection Interface | IGeometryCollection Interface | IPointCollection Interface | IConstructCurve Interface