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VISHH

       SUBROUTINE  VISHH (X0, T0,B0, N0,N0MAX, X,Y,P, N1,N2, IDIR, PL2)
 C$    (Half Horizon)
 C$    Some of the  hidden line subroutines  employ more than  one
 C$    horizon, which  means  that  the  arrays  containing  these
 C$    horizons must appear as explicit arguments in the  updating
 C$    subroutines.  Nevertheless, three of the arguments of VISBO
 C$    are nothing but working arrays  which can still be  removed
 C$    from  the  calling  programs  if  they  are  placed  in  an
 C$    intermediate subroutine such  as this  one.  The  arguments
 C$    are:
 C$
 C$    X0(N0).........Array of arguments for the horizon.
 C$    T0(N0).........Array of values of the upper horizon.
 C$    B0(N0).........Array of values of the lower horizon.
 C$    N0.............Current size of X0(*), T0(*), and B0(*).
 C$    NOMAX..........Maximum size of X0(*), T0(*), and B0(*).
 C$    X(N1:N2).......Array of arguments.
 C$    Y(N1:N2).......Array of function values.
 C$    P(N1:N2).......Array of visibility flags.
 C$    (N1,N2)........Upper and lower limits (in either order) of
 C$                   X(*), Y(*), and P(*) currently in use.
 C$    IDIR...........Pen direction (1 = forward, -1 = backward).
 C$    PL2............2-D pen movement subroutine.
 C$    (10-AUG-89)