IPolygon4 Interface

Provides access to members that extend the IPolygon3 interface.

Members

	Name	Description
	Close	Closes all rings in this polygon. The resulting polygon may not be simple.
	ConnectedComponentBag	Creates and returns a geometry bag containing polygons that represent connected components of the original. The rings of the output polygons are references to rings in the original.
	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.
	ExteriorRingBag	Creates and returns a geometry bag that contains references to all exterior rings.
	ExteriorRingCount	The number of exterior rings.
	FindExteriorRing	Returns the exterior ring containing the specified interior ring.
	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 This method is obsolete.
	GetConnectedComponents	Populates an array with polygons that represent connected components of the original. The rings of the output polygons are references to rings in the original.
	GetConnectedComponents2	Populates an array with polygons that represent connected components of the original. The rings of the output polygons are references to rings in the original.
	GetOutermostComponents	Populates an array with polygons that represent outermost components of the original and all components within (islands within lakes). The rings of the output polygons are references to rings in the original.
	GetOutermostComponents2	Populates an array with polygons that represent outermost components of the original and all components within (islands within lakes). The rings of the output polygons are references to rings in the original.
	GetSubcurve	Extracts a portion of this curve into a new curve.
	InteriorRingBag	Creates and returns a geometry bag that contains references to all rings that are interior to the specified exterior ring.
	InteriorRingCount	The number of rings interior to the specified exterior ring.
	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.
	OutermostComponentBag	Creates and returns a geometry bag containing polygons that represent outermost components of the original and all components within (islands within lakes). The rings of the output polygons are references to rings in the original.
	Project	Projects this geometry into a new spatial reference.
	QueryEnvelope	Copies this geometry's envelope properties into the specified envelope.
	QueryExteriorRings	Populates an array with references to all exterior rings. This method does not marshall correctly out-of-proc. Use QueryExteriorRingsEx on the IPolygon2 interface instead.
	QueryExteriorRingsEx	Returns an array of references to exterior rings, up to a maximum of the number requested.
	QueryExteriorRingsEx2	Returns an array of references to exterior rings.
	QueryFromPoint	Copies this curve's 'from' point to the input point.
	QueryInteriorRings	Populates an array with references to rings that are interior to the specified exterior ring. This method does not marshall correctly out-of-proc. Use QueryInteriorRingsEx on the IPolygon2 interface instead.
	QueryInteriorRingsEx	Returns an array of references to rings that are interior to the specified exterior ring, up to a maximum of the number requested.
	QueryInteriorRingsEx2	Returns an array of references to rings that are interior to the specified exterior ring, up to a maximum of the number requested.
	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.
	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	Same as ITopologicalOperator::Simplify, but with some additional options that affect performance and how the interior is classified.
	SimplifyPreserveFromTo	Simplifies the polygon and maintains the index location of the from/to point of each ring.
	SimplifySpaghetti	Simplifies a polygon but doesn't assume that rings need to be explicitly closed.
	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.

IPolygon4.ConnectedComponentBag Property

Creates and returns a geometry bag containing polygons that represent connected components of the original. The rings of the output polygons are references to rings in the original.

Public ReadOnly Property ConnectedComponentBag As IGeometryBag

public IGeometryBag ConnectedComponentBag {get;}

IPolygon4.ExteriorRingBag Property

Creates and returns a geometry bag that contains references to all exterior rings.

Public ReadOnly Property ExteriorRingBag As IGeometryBag

public IGeometryBag ExteriorRingBag {get;}

public static void PolygonToString(IPolygon4 polygon)

          {

                 IGeometryBag exteriorRingGeometryBag = polygon.ExteriorRingBag;

   

                 IGeometryCollection exteriorRingGeometryCollection = exteriorRingGeometryBag as IGeometryCollection;

   

                 Trace.WriteLine("polygon.ExteriorRingCount = " + exteriorRingGeometryCollection.GeometryCount);

   

                 for (int i = 0; i < exteriorRingGeometryCollection.GeometryCount; i++)

                 {

                        Trace.WriteLine("polygon.ExteriorRing[" + i + "]");

   

                         IGeometry exteriorRingGeometry = exteriorRingGeometryCollection.get_Geometry(i);

   

                         IPointCollection exteriorRingPointCollection = exteriorRingGeometry as IPointCollection;

   

                         for (int j = 0; j < exteriorRingPointCollection.PointCount; j++)

                         {

                                Trace.WriteLine("Point[" + j + "] = " + PointToString(exteriorRingPointCollection.get_Point(j)));

                         }

   

                         IGeometryBag interiorRingGeometryBag = polygon.get_InteriorRingBag(exteriorRingGeometry as IRing);

   

                         IGeometryCollection interiorRingGeometryCollection = interiorRingGeometryBag as IGeometryCollection;

   

                         Trace.WriteLine("polygon.InteriorRingCount[exteriorRing" + i + "] = " + interiorRingGeometryCollection.GeometryCount);

   

                         for (int k = 0; k < interiorRingGeometryCollection.GeometryCount; k++)

                         {

                                Trace.WriteLine("polygon.InteriorRing[" + k + "]");

   

                                IGeometry interiorRingGeometry = interiorRingGeometryCollection.get_Geometry(k);

   

                                IPointCollection interiorRingPointCollection = interiorRingGeometry as IPointCollection;

   

                                for (int m = 0; m < interiorRingPointCollection.PointCount; m++)

                                {

                                       Trace.WriteLine("Point[" + m + "] = " + PointToString(interiorRingPointCollection.get_Point(m)));

                                }

                         }

                 }

          }

   

          private static string PointToString(IPoint point)

          {

              return (point.X + ", " + point.Y + ", " + point.Z);

         }

IPolygon4.InteriorRingBag Property

Creates and returns a geometry bag that contains references to all rings that are interior to the specified exterior ring.

Public Function get_InteriorRingBag ( _
    ByVal exteriorRing As IRing _
) As IGeometryBag

public IGeometryBag get_InteriorRingBag (
    IRing exteriorRing
);

public static void PolygonToString(IPolygon4 polygon)

          {

                 IGeometryBag exteriorRingGeometryBag = polygon.ExteriorRingBag;

   

                 IGeometryCollection exteriorRingGeometryCollection = exteriorRingGeometryBag as IGeometryCollection;

   

                 Trace.WriteLine("polygon.ExteriorRingCount = " + exteriorRingGeometryCollection.GeometryCount);

   

                 for (int i = 0; i < exteriorRingGeometryCollection.GeometryCount; i++)

                 {

                        Trace.WriteLine("polygon.ExteriorRing[" + i + "]");

   

                         IGeometry exteriorRingGeometry = exteriorRingGeometryCollection.get_Geometry(i);

   

                         IPointCollection exteriorRingPointCollection = exteriorRingGeometry as IPointCollection;

   

                         for (int j = 0; j < exteriorRingPointCollection.PointCount; j++)

                         {

                                Trace.WriteLine("Point[" + j + "] = " + PointToString(exteriorRingPointCollection.get_Point(j)));

                         }

   

                         IGeometryBag interiorRingGeometryBag = polygon.get_InteriorRingBag(exteriorRingGeometry as IRing);

   

                         IGeometryCollection interiorRingGeometryCollection = interiorRingGeometryBag as IGeometryCollection;

   

                         Trace.WriteLine("polygon.InteriorRingCount[exteriorRing" + i + "] = " + interiorRingGeometryCollection.GeometryCount);

   

                         for (int k = 0; k < interiorRingGeometryCollection.GeometryCount; k++)

                         {

                                Trace.WriteLine("polygon.InteriorRing[" + k + "]");

   

                                IGeometry interiorRingGeometry = interiorRingGeometryCollection.get_Geometry(k);

   

                                IPointCollection interiorRingPointCollection = interiorRingGeometry as IPointCollection;

   

                                for (int m = 0; m < interiorRingPointCollection.PointCount; m++)

                                {

                                       Trace.WriteLine("Point[" + m + "] = " + PointToString(interiorRingPointCollection.get_Point(m)));

                                }

                         }

                 }

          }

   

          private static string PointToString(IPoint point)

          {

              return (point.X + ", " + point.Y + ", " + point.Z);

         }

IPolygon4.OutermostComponentBag Property

Creates and returns a geometry bag containing polygons that represent outermost components of the original and all components within (islands within lakes). The rings of the output polygons are references to rings in the original.

Public ReadOnly Property OutermostComponentBag As IGeometryBag

public IGeometryBag OutermostComponentBag {get;}

IPolygon4.SimplifyEx Method

Same as ITopologicalOperator::Simplify, but with some additional options that affect performance and how the interior is classified.

Public Sub SimplifyEx ( _
    ByVal preserveFromToPoints As Boolean, _
    ByVal closeRings As Boolean, _
    ByVal useXORRule As Boolean _
)

public void SimplifyEx (
    bool preserveFromToPoints,
    bool closeRings,
    bool useXORRule
);

Remarks

Parameters:

preserveFromToPoints: Boolean value that determines if the from/to points of a ring in the polygon need to remain located at ring indexes 0 and PointCount-1 af the completion of the operation. Specify 'false' to improve performance of this operation.

closeRings : Boolean value that determines if the rings of the polygon must be closed prior to reconstruct the topology of the polygon. Specify false if you know that rings are closed or you are passing in spaghetti input that should not be checked for closure.

useXORRule: Boolean value that determines how the 'inside' of the polygon is determined. Specify true to use an even-odd counting rule: a point is inside the polygon if a horizontal line through that has encountered an odd number of boundaries to the left (overlapping boundaries count 1 for each overlap). Use this when the input consists of well-defined rings that need to be oriented correctly, have overlaps removed, etc. Specify false to use the default behavior, which iterates over a two step process: dangle removal, then "peeling off" of the largest unambiguous rings. This approach can remove more segments than the XOR-true approach, but is probably more appropriate for spaghetti input where segment overlaps should not be considered significant.

Here is an example of the different between XOR=TRUE vs. XOR= FALSE:

Inherited Interfaces

Interfaces	Description
IPolygon3	Provides access to members that extend the IPolygon2 interface.
IPolygon2	Provides access to members that extend the IPolygon interface.
IPolygon	Provides access to members that identify a polygon and permit controlled access to its inner and outer rings.
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 IPolygon4

Classes	Description
Polygon	A collection of rings ordered by their containment relationship; optionally has measure, height and ID attributes.