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PVITV

       SUBROUTINE  PVITV (Z1,ZE,Z2, MX,MY, NX,NY, S, PL2)
 C$    (Triangular View)
 C$    Program to  produce a  perspective  drawing of  a  function
 C$    defined over  the unit  triangle  in terms  of  homogeneous
 C$    triangular coordinates.   The  function values  occupy  the
 C$    lower triangular portion of the square matrix ZE(MX,MY), of
 C$    which only  the fragment  ZE(NX,NY) is  to be  drawn.   The
 C$    arguments are:
 C$
 C$    (MX,MY)........Actual declared dimensions of ZE(*,*).
 C$    ZE(NX,NY)......Array of  function values.   Only the  lower
 C$                   triangle  of  the  square  cross-section  of
 C$                   dimension (NX,NX) is used.
 C$    (Z1,Z2)........Span of Z values.
 C$    S.............. = 1.0, plot positive; = -1.0, plot negative
 C$    PL2............2-D pen movement subroutine, perhaps PL2CA
 C$    (09-APR-82)