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SUBROUTINE HIDNW (Z0, Z1,ZE,Z2, MX,MY, NX,NY, LX,LY, S, PL2)
C$ (Northwest Sheared View)
C$ Produce a parallel projection drawing of a single-valued
C$ function defined in Cartesian coordinates, exhibiting arcs
C$ on the surface parallel to the coordinate axes. A sheared
C$ view from somewhat above the northwest (0,1,0) corner is
C$ produced. The arguments are:
C$
C$ Z0........Cutoff value. Only function values, ZE(I,J),
C$ above (S .GT. 0.0) or below (S .LT. 0) Z0 are
C$ visible.
C$ ZE(*,*)...Array containing the surface. ZE(I,J) =
C$ F(X(I),Y(J)).
C$ Z1,Z2.....Span of surface values.
C$ MX,MY.....Actual declared dimensions of the array ZE(*,*).
C$ NX,NY.....Sections of ZE(*,*) actually used.
C$ LX,LY.....Increments in X and Y directions (.GT. 0).
C$ Values of LX and LY larger than 1 produce a
C$ coarser mesh on the drawing without losing the
C$ smoothness of the complete surface. LX should be
C$ an integral divisor of NX-1, and LY of NY-1. If
C$ this is not the case, the next smallest value
C$ which satisfies this requirement is used
C$ internally.
C$ S.........=+1.0, graph positive part of function,
C$ =-1.0, graph negative part of function,
C$ = 0.0, graph both positive and negative parts.
C$ If S = 0.0, the cutoff value Z0 has no effect.
C$ PL2.......2-D pen movement subroutine, usually PL2CA
C$
C$ (04-FEB-82)