Class GraphPack.DirEdge 
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Class GraphPack.DirEdge 

java.lang.Object
   |
   +----GraphPack.QNode
           |
           +----GraphPack.Edge
                   |
                   +----GraphPack.DirEdge
public class DirEdge
extends Edge
implements EdgeList
DirEdge extends Edge, but semantically the edge is only from v1 to v2. Each DirEdge object has its own instantiation of a EdgeDrawingInterface which stores information on how to draw the edge. Drawing methods are accessed through drawing(). If an edge (v2,v1) is added or v1 or v2 is moved, update() is called, so that the information on drawing the edge stays consist with the graph.

DirEdge(Vertex, Vertex, UndoMan)
DirEdge(Vertex, Vertex, boolean, UndoMan)
initializes DirEdge from _v1 to _v2, and onlyEdge = B

copy()
return new copy of this Edge
drawing()
return this Edge\'s EdgeDrawingInterface object
equals(Edge)
two edges in a directed graph are equal if the vertices are equal
midx()
return x value of midpoint of edge: on a straight line if onlyEdge, otherwise is the midpoint of an arc from v1 to v2
midy()
return y value of midpoint of edge: on a straight line if onlyEdge, otherwise is the midpoint of an arc from v1 to v2
onlyEdge(boolean)
set onlyEdge to B
onlyEdge()
return true if this is the only edge between v1 and v2
setDrawing(EdgeDrawingInterface)
set drawing value to given EdgeDrawingInterface
update()
update the drawing information
writeE(boolean)
write out this edge\'s attributes: E ( , ) where s are the tempnums of it\'s vertices

DirEdge 
  public DirEdge(Vertex _v1,
                 Vertex _v2,
                 UndoMan um)
DirEdge 
  public DirEdge(Vertex _v1,
                 Vertex _v2,
                 boolean B,
                 UndoMan um)
initializes DirEdge from _v1 to _v2, and onlyEdge = B

copy 
  public Edge copy()
return new copy of this Edge
Overrides:
copy in class Edge

onlyEdge 

  public void onlyEdge(boolean B)
set onlyEdge to B

onlyEdge 

  public boolean onlyEdge()
return true if this is the only edge between v1 and v2

update 

  public void update()
update the drawing information
Overrides:
update in class Edge

drawing 

  public EdgeDrawingInterface drawing()
return this Edge\'s EdgeDrawingInterface object
Overrides:
drawing in class Edge

setDrawing 

  public void setDrawing(EdgeDrawingInterface edi)
set drawing value to given EdgeDrawingInterface

midx 

  public double midx()
return x value of midpoint of edge: on a straight line if onlyEdge, otherwise is the midpoint of an arc from v1 to v2
Overrides:
midx in class Edge

midy 

  public double midy()
return y value of midpoint of edge: on a straight line if onlyEdge, otherwise is the midpoint of an arc from v1 to v2
Overrides:
midy in class Edge

equals 

  public boolean equals(Edge e)
two edges in a directed graph are equal if the vertices are equal
Overrides:
equals in class Edge

writeE 

  public String writeE(boolean highlight)
write out this edge\'s attributes: E ( , ) where s are the tempnums of it\'s vertices
Overrides:
writeE in class Edge

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