NAME

       SFNORM - The subroutines SFWRLD and SFNORM are used to fill that portion of the plotter frame inside the
       area defined by a given polygonal boundary.

SYNOPSIS

       CALL SFNORM (XRA,YRA,NRA,DST,NST,IND,NND)
       CALL SFWRLD (XRA,YRA,NRA,DST,NST,IND,NND)

C-BINDING SYNOPSIS

       #include <ncarg/ncargC.h>

       void c_sfnorm (float *xra, float *yra, int nra,
       float *dst, int nst, int *ind, int nnd)

       void c_sfwrld (float *xra, float *yra, int nra,
       float *dst, int nst, int *ind, int nnd)

DESCRIPTION

       XRA         (an input/output array of type REAL, dimensioned NRA) contains the X coordinates of the
                   points defining the area to be filled, in the user coordinate system (if SFWRLD is called) or
                   in the fractional coordinate system (if SFNORM is called). Upon return from SFWRLD, the
                   contents of XRA will have been converted to the fractional coordinate system.

       YRA         (an input/output array of type REAL, dimensioned NRA) contains the Y coordinates of the
                   points defining the area to be filled, in the user coordinate system (if SFWRLD is called) or
                   in the fractional coordinate system (if SFNORM is called). Upon return from SFWRLD, the
                   contents of YRA will have been converted to the fractional coordinate system.

       NRA         (an input expression of type INTEGER) is the number of points defining the area to be filled.
                   NRA must be greater than two.

       DST(NST)    (a scratch array of type REAL, dimensioned NST or greater) is for use by the fill algorithm.

       NST         (an input expression of type INTEGER) is the length of the array DST. It must be greater than
                   or equal to NRA + NIM, where NIM is the largest number of intersection points of any fill
                   line with the boundary lines. To be sure DST is large enough, use NIM = NRA; in practice, NIM
                   rarely needs to be that large.  For a convex polygon, for example, NIM = 2 suffices.

       IND         (a scratch array of type INTEGER, dimensioned NND or greater) is for use by the fill
                   algorithm.

       NND         (an input expression of type INTEGER) is the length of the array IND. It must be greater than
                   or equal to NRA + 2 * NIM, where NIM is as defined above.

C-BINDING DESCRIPTION

       The C-binding argument descriptions are the same as the FORTRAN argument descriptions.

USAGE

       Both SFWRLD and SFNORM fill the area defined by the points (XRA(I),YRA(I)), for I from 1 to NRA. The
       lines connecting point 1 to point 2, point 2 to point 3, ..., point NRA-1 to point NRA, and point NRA to
       point 1 bound the area to be filled. The default values of SOFTFILL's internal parameters cause fill to
       be done with solid, horizontal lines .00125 normalized-device-coordinate units apart.

       Use SFWRLD if the arrays XRA and YRA contain world coordinates.  Use SFNORM if XRA and YRA contain
       normalized device coordinates. Since SFWRLD transforms XRA and YRA from world coordinates to normalized
       device coordinates, any subsequent calls with those arrays should be to SFNORM (for example, to create a
       cross-hatched effect).

EXAMPLES

       Use the ncargex command to see the following relevant examples: ccpscam, cpex01, cpex02, cpex03, sfex01,
       tsoftf.

ACCESS

       To use SFWRLD, SFNORM, c_sfwrld, or c_sfnorm, load the NCAR Graphics libraries ncarg, ncarg_gks, and
       ncarg_c, preferably in that order.

MESSAGES

       See the softfill man page for a description of all Softfill error messages and/or informational messages.

SEE ALSO

       Online: softfill, softfill_params, sfgetc, sfgeti, sfgetp, sfgetr, sfsetc, sfseti, sfsetp, sfsetr,
       sfsgfa, ncarg_cbind

       Hardcopy: NCAR Graphics Fundamentals, UNIX Version

COPYRIGHT

       Copyright (C) 1987-2009
       University Corporation for Atmospheric Research
       The use of this Software is governed by a License Agreement.