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PLTCL

       SUBROUTINE  PLTCL (P,Q,RESET)
 C$    (Clipped Line)
 C$    Draw a line between  two 4-D points,  P(*) and Q(*),  where
 C$    both P(4) and Q(4) are non-negative.  The line segment will
 C$    be incorrect if this is not  the case, and PLTLS should  be
 C$    called instead to filter out this possibility.
 C$
 C$    The line  is clipped  to fit  the viewport  if clipping  or
 C$    dashing has been  selected, or  if either P(4)  or Q(4)  is
 C$    zero, such that the line segment passes to infinity.  RESET
 C$    is set .TRUE. if a new dashing pattern is to be  initiated,
 C$    and is ignored if line dashing is not in effect.  P(*)  and
 C$    Q(*) will usually  be changed  on return.   RESET is  never
 C$    modified.
 C$    (12-MAR-85)