IEnumVertex Interface

Provides access to members that iterate over the vertices or points of a geometry (see the EnumVertices property of the IPointCollection interface). Note: the IEnumVertex interface has been superseded by IEnumVertex2. Please consider using the more recent version.

Product Availability

Description

The methods on IEnumVertex interface can be used to access points of a point collection. EnumVertex is a lightweight object that you can use to pass around between routines. You may wish to use this enumerator in preference to the Points array returned by the IPointCollection::Points property, as it allows you to directly change the x-, y-, z-, m-, and ID properties of each Point, although Points cannot be removed or replaced using this interface. The IEnumVertex has knowledge of parts within multipart shapes and may therefore be convenient for use on a multipart shape, such as a Polygon or Polyline. Those methods are more efficient than the IPointCollection methods to access a large number of points in a sequential order for polyline and polygon. The collection methods transform absolute point index into a part relative index, enumerators don't.

Members

	Name	Description
	Clone	Returns a copy of this enumerator positioned at the same vertex.
	IsLastInPart	Indicates if the current vertex is last in the current part.
	Next	Returns the next vertex and its location within the geometry.
	NextInPart	Returns the next vertex in current part, or goes back to the first vertex in the part after last vertex in part is encountered.
	Previous	Returns the previous vertex and its location in the geometry.
	put_Attribute	Sets attribute values at the current vertex.
	put_ID	Sets the ID attribute of the current vertex. For segment-based geometries, this will modify a pair of segments.
	put_M	Sets the M attribute of the current vertex. For segment-based geometries, this will modify a pair of segments.
	put_X	Sets the X coordinate of the current vertex. For segment-based geometries, this will modify a pair of segments.
	put_Y	Sets the Y coordinate of the current vertex. For segment-based geometries, this will modify a pair of segments.
	put_Z	Sets the Z coordinate of the current vertex. For segment-based geometries, this will modify a pair of segments.
	QueryNext	Copies the next vertex to the input parameter and returns its location in the geometry.
	QueryNextInPart	Copies the next vertex in the current part to the input parameter and returns its location in current part. Continues with the first vertex in the part if already at the end.
	QueryPrevious	Copies the previous vertex to the input parameter and returns its location in the geometry.
	Reset	Starts from the beginning of the geometry the next time Next is called.
	ResetToEnd	Starts from the end of the geometry the next time Previous is called.
	SetAt	Resets enumerator to specific location.
	Skip	Skips forward or backward over a specified number of vertices.

Classes that implement IEnumVertex