Class EdgeRing

Inheritance
Object
EdgeRing
MaximalEdgeRing
MinimalEdgeRing
Inherited Members
Namespace: NetTopologySuite.GeometriesGraph
Assembly: NetTopologySuite.dll
Syntax
public abstract class EdgeRing

Constructors

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EdgeRing(DirectedEdge, GeometryFactory)

Creates an instance of this class using the provided start and geometryFactory.

Declaration
protected EdgeRing(DirectedEdge start, GeometryFactory geometryFactory)
Parameters
Type Name Description
DirectedEdge start

The start DirectedEdge for the EdgeRing
GeometryFactory geometryFactory

A GeometryFactory

Fields

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startDe

The directed edge which starts the list of edges for this EdgeRing.

Declaration
protected DirectedEdge startDe
Field Value
Type Description
DirectedEdge

Properties

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Edges

Returns the list of DirectedEdges that make up this EdgeRing.

Declaration
public IList<DirectedEdge> Edges { get; }
Property Value
Type Description
IList<DirectedEdge>

A list of DirectedEdges
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GeometryFactory

A GeometryFactory to use.

Declaration
protected GeometryFactory GeometryFactory { get; }
Property Value
Type Description
GeometryFactory
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IsHole

Gets a value indicating if this EdgeRing is a hole of a Polygon

Declaration
public bool IsHole { get; }
Property Value
Type Description
Boolean
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IsIsolated

Gets a value indicating if this EdgeRing is isolated

Declaration
public bool IsIsolated { get; }
Property Value
Type Description
Boolean
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IsShell

Declaration
public bool IsShell { get; }
Property Value
Type Description
Boolean
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Label

Gets a value indicating the topological relationship of this EdgeRing

Declaration
public Label Label { get; }
Property Value
Type Description
Label
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LinearRing

Gets the geometry representation of this EdgeRing

Declaration
public LinearRing LinearRing { get; }
Property Value
Type Description
LinearRing
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MaxNodeDegree

Declaration
public int MaxNodeDegree { get; }
Property Value
Type Description
Int32
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Shell

Declaration
public EdgeRing Shell { get; set; }
Property Value
Type Description
EdgeRing

Methods

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AddHole(EdgeRing)

Add an EdgeRing representing a hole

Declaration
public void AddHole(EdgeRing ring)
Parameters
Type Name Description
EdgeRing ring

The ring to add
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AddPoints(Edge, Boolean, Boolean)

Declaration
protected void AddPoints(Edge edge, bool isForward, bool isFirstEdge)
Parameters
Type Name Description
Edge edge
Boolean isForward
Boolean isFirstEdge
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ComputePoints(DirectedEdge)

Collect all the points from the DirectedEdges of this ring into a contiguous list.

Declaration
protected void ComputePoints(DirectedEdge start)
Parameters
Type Name Description
DirectedEdge start
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ComputeRing()

Compute a LinearRing from the point list previously collected. Test if the ring is a hole (i.e. if it is CCW) and set the hole flag accordingly.

Declaration
public void ComputeRing()
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ContainsPoint(Coordinate)

This method will cause the ring to be computed. It will also check any holes, if they have been assigned.

Declaration
public bool ContainsPoint(Coordinate p)
Parameters
Type Name Description
Coordinate p

The point to test
Returns
Type Description
Boolean

true if the ring contains point p
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GetCoordinate(Int32)

Access a Coordinate of this EdgeRing by its index.

Declaration
public Coordinate GetCoordinate(int i)
Parameters
Type Name Description
Int32 i

The index of the Coordinate
Returns
Type Description
Coordinate

The Coordinate at index i
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GetNext(DirectedEdge)

Declaration
public abstract DirectedEdge GetNext(DirectedEdge de)
Parameters
Type Name Description
DirectedEdge de
Returns
Type Description
DirectedEdge
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MergeLabel(Label)

Declaration
protected void MergeLabel(Label deLabel)
Parameters
Type Name Description
Label deLabel
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MergeLabel(Label, Int32)

Merge the RHS label from a DirectedEdge into the label for this EdgeRing. The DirectedEdge label may be null. This is acceptable - it results from a node which is NOT an intersection node between the Geometries (e.g. the end node of a LinearRing). In this case the DirectedEdge label does not contribute any information to the overall labelling, and is simply skipped.

Declaration
protected void MergeLabel(Label deLabel, int geomIndex)
Parameters
Type Name Description
Label deLabel
Int32 geomIndex
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SetEdgeRing(DirectedEdge, EdgeRing)

Declaration
public abstract void SetEdgeRing(DirectedEdge de, EdgeRing er)
Parameters
Type Name Description
DirectedEdge de
EdgeRing er
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SetInResult()

Declaration
public void SetInResult()
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ToPolygon(GeometryFactory)

Create the Polygon described by this EdgeRing

Declaration
public Polygon ToPolygon(GeometryFactory geometryFactory)
Parameters
Type Name Description
GeometryFactory geometryFactory

The GeometryFactory to use.
Returns
Type Description
Polygon

A Polygon