ArcGIS Developer Help  (Geometry)    

ITopologicalOperator.Buffer Method

Constructs a polygon that is the locus of points at a distance less than or equal to a specified distance from this geometry.

[Visual Basic 6.0]
Function Buffer(
    ByVal distance As Double _
) As IGeometry
[Visual Basic .NET]
Public Function Buffer ( _
    ByVal distance As Double _
) As IGeometry
public IGeometry Buffer (
    double distance
public IGeometry buffer (
    double distance
  double distance,
  IGeometry** outBuffer



  distance is a parameter of type double

outBuffer [out, retval]

  outBuffer is a parameter of type IGeometry

Product Availability

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


The buffer distance is a double number in the same units as the source shape that is being buffered.

Note : A negative distance can be specified to produce a buffer inside the original polygon. This cannot be used with polyline. ITopologicalOperator methods must be applied on high-level geometries only. High-Level geometries are point, multipoint, polyline and polygon. To use it with low-level geometries such as segments (Line, Circular Arc, Elliptic Arc, Bézier Curve), path or ring they must be wrapped into high-level geometries type.

Buffer Example

[Visual Basic 6.0]

'How to wrap a line segment into a polyline in VB6

'Assume a line (pLine as ILine) is already created

dim psc as ISegmentCollection

set psc = New Polyline

psc.addsegment pline

'Set the spatial reference on the new polyline

'The spatial reference is not transfered automatically from the segments

dim pgeo as IGeometry

set pgeo = psc

set pgeo.SpatialReference = pMyspatialReference

'Can now be used with ITopologicalOperator methods

See Also

ITopologicalOperator Interface


Buffer Example


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