ArcObjects Library Reference (Geometry)

IPolyline Interface

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 Note: the IPolyline interface has been superseded byIPolyline5.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

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.

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

	Name	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-Peucker 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 This method is obsolete.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
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.

Polylines

.NET Snippets

.NET Samples

Curve conversion add-in (Code Files: CurveConversionDockWin) | 3D multipatch examples (Code Files: ExtrusionExamples) | Custom reshape polyline edit task (Code Files: ReshapePolylineEditTask) | Visualizing the camera path while animating (Code Files: VisualizeCameraPath) | Points along line construction tool (Code Files: PointsAlongLineForm) | ViperPin tool (Code Files: ViperPinForm) | Custom UI elements using add-ins (Code Files: AddGraphicsTool) | Implementing an XML builder external component (Code Files: XMLDocImpl) | Move a graphic along a path in ArcMap (Code Files: AnimationUtils) | Creating a toolbar of globe tools (Code Files: PolylineGeometry) | StreetMap routing (Code Files: RoutingForm) | Create a custom tool (Code Files: DrawGraphicLine) | Custom selection extension (Code Files: SelectByLineTool) | Create a custom selection extension by extending ArcObjects (Code Files: SelectByLineTool) | Reducing schematic nodes and computing a cumulative attribute via a schematic rule (Code Files: NodeReductionRule) | Draw text on a MapControl (Code Files: DrawText)

.NET Related Topics