Provides access to members that extend a polyline object. Note: the IPolyline4 interface has been superseded by IPolyline5. Please consider using the more recent version.
Product Availability
Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.
Members

Name 
Description 

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

Dimension 
The topological dimension of this geometry. 

EnumShortestPath 
Not implemented. 

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 DouglasPeucker 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 This method is obsolete.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. 

SimplifyEx 
Use either planar or network simplify regardless of current attribute awareness. 

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. 

TouchCut 
Cut a polyline at locations where the cutter only touches the polyline, in addition to locations where the cutter crosses it. 

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 
IPolyline3 
Provides access to members that extend a polyline object. 
IPolyline2 
Provides access to members that extend a polyline object. 
IPolyline 
Provides access to members that identify and add behavior to a polyline object. 
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. 
Classes that implement IPolyline4
Classes 
Description 
Polyline 
An ordered collection of paths; optionally has measure, height and ID attributes. 