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PLTLS

       SUBROUTINE  PLTLS (P,Q,RESET)
 C$    (Line Segment)
 C$    Draw a visible  line segment  between 4-D  points P(*)  and
 C$    Q(*),  clipping  to  the  viewport  if  clipping  has  been
 C$    requested, or if the line  segment goes through a point  at
 C$    infinity.  RESET is set .TRUE. if a new dashing pattern  is
 C$    to be initiated, and is ignored  if line dashing is not  in
 C$    effect.  Special care is taken  here to handle the case  of
 C$    external line segments  which arise when  a segment  passes
 C$    through  a  point  at  infinity.   P(*)  and  Q(*)  may  be
 C$    destroyed on return.
 C$    (07-JAN-82)