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PVIIV

       SUBROUTINE  PVIIV (Z1,ZE,Z2, MX,MY, NX,NY, RO,TI, S, PL2)
 C$    (Inclined View)
 C$    The surface may be tilted in the direction of the  observer
 C$    and then rotated about a vertical axis before generating  a
 C$    hidden  line  view.   Tilt  is  zero  when  seen   directly
 C$    overhead, 90 degrees  when seen directly  from the  ground.
 C$    Positive tilt is  toward the observer,  negative tilt  away
 C$    from him.  The angle  of rotation is  zero when the  Y-axis
 C$    runs directly away from the observer, and is positive  when
 C$    the positive X-axis moves toward him.  The arguments are:
 C$
 C$    (MX,MY)........Actual declared dimensions of ZE(*,*).
 C$    ZE(NX,NY)......Array of function values.
 C$    (Z1,Z2)........Span of Z values.
 C$    RO,TI..........Angles of rotation and tilt, in degrees.
 C$    S.............. = 1.0, graph positive; = -1.0, graph
 C$                   negative part.
 C$    PL2............2-D pen movement subroutine, usually PL2CA
 C$    (09-APR-82)