WMBARB - plots wind barbs.

       To  use WMBARB or c_wmbarb, load the NCAR Graphics libraries ncarg, ncarg_gks, and ncarg_c, preferably in
       that order.

       #include <ncarg/gks.h>

       void c_wmbarb(float x, float y, float u, float v)

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

UNIX                                              January 1995                                    WMBARB(3NCARG)

       X           (Real,  Input)  -  An X coordinate (specified in world coordinates) of a point that specifies
                   the position of the base of a wind barb.

       Y           (Real, Input) - A Y coordinate (specified in world coordinates) of a point that specifies the
                   position of the base of a wind barb.

       U           (Real, Input) - The X component of a wind vector.

       V           (Real, Input) - The Y component of a wind vector.

       WMBARB - plots wind barbs.

       Online: wmap, wmdflt, wmgetc, wmgeti, wmgetr, wmlabs, wmsetc, wmseti, wmsetr, wmstnm, wmap_params

       Hardcopy: WMAP - A Package for Producing Daily Weather Maps and Plotting Station Model Data

       CALL WMBARB (X,Y,U,V)

       The angle at which the wind barb is drawn is determined by the vector (U,V) and  the  magnitude  of  that
       vector  denotes  the  wind speed in knots.  Set the values for the appropriate internal parameters before
       calling WMBARB to produce the wind barb.  The internal parameters that control  the  appearance  of  wind
       barbs are: COL, WBA, WBD, WBF, WBS, WBT.