Basic edge plot, all the standard base graphics facilities for line segments are available.
sc object
arguments passed to lower level plotting functions
if TRUE
add to current plot
The 'col' argument is passed directly to segments()
or polypath()
as needed, in the usual
one-to-one or recycling way.
Graphical parameters are not able to be passed to the initial plot setup, but a plot can be set up and then added to with this method.