'Set the edgecolor(s) of the collection. *c* can be a
matplotlib color spec (all patches have same color), or a
sequence of specs; if it is a sequence the patches will
cycle through the sequence.
If *c* is \'face\', the edge color will always be the same as
the face color.  If it is \'none\', the patch boundary will not
be drawn.
ACCEPTS: matplotlib color spec or sequence of specs'

def set_edgecolor(self, c):

    self._original_edgecolor = c
    self._set_edgecolor(c)
