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PLNA2

       SUBROUTINE  PLNA2 (XARRAY,INCX,YARRAY,INCY,N)
 C$    (Polyline Absolute 2-D)
 C$    Beginning at the current point, draw line segments to  each
 C$    of the N  points stored in  (XARRAY(*),YARRAY(*)) in  turn,
 C$    ending at the N-th point which will become the new  current
 C$    position.  INCX  and  INCY are  the  displacements  between
 C$    successive X  and  Y  values in  the  arrays.   These  will
 C$    normally be  both  1.  If  an  increment INCX  or  INCY  is
 C$    negative, the starting  vertex is  taken as  (1-N)*INC +  1
 C$    instead of  1, so  that  the array  is stepped  through  in
 C$    reverse order.
 C$    (02-APR-82)