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 _polygon_wxy()          Draw a polygon (window pair coords)

 #include   <graph.h>

 short _polygon_wxy(control, points, numpoints);
 short control;                 Fill control: _GBORDER or _GFILLINTERIOR
 struct _wxycoord _far *points; Array of data points (i.e. vertices)
 short numpoints;               Number of points (i.e. vertices)

    _polygon_wxy() is the window pair coordinates version of
    _polygon(); it draws a polygon on the screen, taking the
    numpoints points in points for the polygon's vertices. Each
    of the points are stored as an _wxycoord structure. See _polygon()
    for more information.

    Returns:    Nonzero value for success; 0 otherwise.

   Portability:     MS-DOS only, true MDPA, CGA, EGA, MCGA, or VGA video
                    compatibles