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VISDC

       SUBROUTINE  VISDC (Z1,ZE,Z2, MX,MY, NX,NY, S, NZ, US,VS, L, PL2)
 C$    (Diagonal Contoured Sequence)
 C$    Program to  produce a  hidden-line view  of a  surface,  on
 C$    which are embedded contour lines.  The arguments are:
 C$
 C$    (MX,MY)........Actual declared dimensions of ZE(*,*).
 C$    ZE(NX,NY)......Array of function values.
 C$    (NX,NY)........Ranges of J and I.
 C$    (Z1,Z2)........Span of Z values.
 C$    S.............. = +1.0, plot positive  part of function,  =
 C$                   -1.0, plot negative part of function.   Only
 C$                   the sign of S is significant.  S = 0.0 plots
 C$                   both positive and negative.
 C$    NZ.............Number of contour lines to be drawn.
 C$    US,VS..........Total shears in U and V directions (maximum
 C$                   1.0).
 C$    L..............Direction of view and increment (+: west,
 C$                   -: east)
 C$    PL2............2-D pen movement subroutine, usually PL2CA.
 C$
 C$    The algorithm used has a time proportional to NX*NY*NZ,  so
 C$    that this routine is about NZ times slower than most of the
 C$    other horizon-based hidden-line routines.
 C$    (09-APR-82)