path <-
points: chainChain of points the line-segments goes through. The class of each point
determines how the path gets there from the previous point: a straight
line for a plain point, or a curve, arc or jump for a curve_point,
arc_point or move_point. These are ignored for
smooth paths. The send-method validates and possibly
converts all members of the argument chain to be instances of class point
and raises the error unexpected_type on failure. On
successs, it replaces the path<-points
chain of the path with the argument. The argument thus becomes a part of
the path object. See
also path->initialise.