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PLTDL

       SUBROUTINE  PLTDL (P1,P2,RESET)
 C$    (Dashed Line)
 C$    Generate a visible dashed line between 3-dimensional points
 C$    P1(*) and P2(*)  according to  the dash  pattern stored  in
 C$    COMMON.  If RESET = .TRUE., the pattern will start from the
 C$    beginning.  Otherwise,  it  will  continue  from  its  last
 C$    position.
 C$
 C$    The CORE proposal  decrees that the  shortest visible  dash
 C$    pattern is a dot of zero  length.  On pen plotters, such  a
 C$    dot is  difficult to  place  because ink  may not  be  left
 C$    behind when  the  pen  is lowered  and  raised  again.   We
 C$    therefore always draw a  short segment in  place of a  dot,
 C$    but the position  of the next  visible segment is  computed
 C$    assuming the dot had zero length.
 C$    (09-SEP-83)