(slot) Holds a list of <edge-segment-item> objects containing
segments of the edge and associated labels. For binary graphs,
the segment list has length 1.
(slot) Holds the <edge*> object contained within
eg.
(slot) The width of the line segments in <edge-item>. The default is
1.
(slot) The color of the line segments in <edge-item>.
(slot) The color of the edge label(s).
(slot) The font of the edge label(s).
(slot) The STk tags associated with the edge-item. This
information
is contained in a list, and some common values include 'edge,
which is always present in vertices, and 'link:selected-item,'
which is added if the user selects the edge.
(method) Lower the priority of the edge in the STk <canvas>'s list
of displayed items, moving it below all other items.
(method) Raise the priority of the edge in the STk <canvas>'s list
of displayed items, moving it above all other items.
(method) Assign random values to the weight attribute of the
<graph*> object. OLD, UNSATISFACTORY.
USES STk's RANDOM, WHICH CALLS RAND(). VERY BAD.
(method) Produce a list of the weight attributes of the edges of
<graph*>
g.