Class EdgeEnd

Models the end of an edge incident on a node.

Inheritance
object
EdgeEnd
DirectedEdge
EdgeEndBundle
Implements
Inherited Members
Namespace: NetTopologySuite.GeometriesGraph
Assembly: NetTopologySuite.dll
Syntax
public class EdgeEnd : IComparable<EdgeEnd>
Remarks

EdgeEnds have a direction determined by the direction of the ray from the initial point to the next point.

EdgeEnds are IComparable under the ordering "a has a greater angle with the x-axis than b". This ordering is used to sort EdgeEnds around a node.

Constructors

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EdgeEnd(Edge)

Declaration
protected EdgeEnd(Edge edge)
Parameters
Type Name Description
Edge edge
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EdgeEnd(Edge, Coordinate, Coordinate)

Declaration
public EdgeEnd(Edge edge, Coordinate p0, Coordinate p1)
Parameters
Type Name Description
Edge edge
Coordinate p0
Coordinate p1
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EdgeEnd(Edge, Coordinate, Coordinate, Label)

Declaration
public EdgeEnd(Edge edge, Coordinate p0, Coordinate p1, Label label)
Parameters
Type Name Description
Edge edge
Coordinate p0
Coordinate p1
Label label

Properties

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Coordinate

Declaration
public Coordinate Coordinate { get; }
Property Value
Type Description
Coordinate
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DirectedCoordinate

Declaration
public Coordinate DirectedCoordinate { get; }
Property Value
Type Description
Coordinate
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Dx

Declaration
public double Dx { get; }
Property Value
Type Description
double
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Dy

Declaration
public double Dy { get; }
Property Value
Type Description
double
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Edge

Declaration
public Edge Edge { get; protected set; }
Property Value
Type Description
Edge
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Label

Declaration
public Label Label { get; protected set; }
Property Value
Type Description
Label
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Node

Declaration
public Node Node { get; set; }
Property Value
Type Description
Node
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Quadrant

Declaration
[Obsolete("Use QuadrantEx")]
public int Quadrant { get; }
Property Value
Type Description
int
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QuadrantEx

Gets a value indicating the Quadrant this EdgeEnd lies in.

Declaration
public Quadrant QuadrantEx { get; }
Property Value
Type Description
Quadrant

Methods

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CompareDirection(EdgeEnd)

Implements the total order relation: a has a greater angle with the positive x-axis than b.

Using the obvious algorithm of simply computing the angle is not robust, since the angle calculation is obviously susceptible to round off.

A robust algorithm is:
  • first compare the quadrant. If the quadrants are different, it it trivial to determine which vector is "greater".
  • if the vectors lie in the same quadrant, the computeOrientation function can be used to decide the relative orientation of the vectors.
Declaration
public int CompareDirection(EdgeEnd e)
Parameters
Type Name Description
EdgeEnd e

An EdgeEnd
Returns
Type Description
int

The OrientationIndex of e compared to this EdgeEnd.
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CompareTo(EdgeEnd)

Declaration
public int CompareTo(EdgeEnd e)
Parameters
Type Name Description
EdgeEnd e
Returns
Type Description
int
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ComputeLabel(IBoundaryNodeRule)

Subclasses should override this if they are using labels

Declaration
public virtual void ComputeLabel(IBoundaryNodeRule boundaryNodeRule)
Parameters
Type Name Description
IBoundaryNodeRule boundaryNodeRule
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Init(Coordinate, Coordinate)

Declaration
protected void Init(Coordinate p0, Coordinate p1)
Parameters
Type Name Description
Coordinate p0
Coordinate p1
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ToString()

Declaration
public override string ToString()
Returns
Type Description
string
Overrides
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Write(StreamWriter)

Declaration
public virtual void Write(StreamWriter outstream)
Parameters
Type Name Description
StreamWriter outstream

Implements