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 _rectangle_wxy()        Draw a rectangle (window pair coords)

 #include   <graph.h>

 short _rectangle_wxy(control, wpoint1, wpoint2);
 short control;                         _GBORDER or _GFILLINTERIOR
 struct _wxycoord _far *wpoint1         Upper left of rectangle
 struct _wxycoord _far *wpoint2         Lower right of rectangle

    _rectangle_wxy() is the window pair coordinates version of
    _rectangle(); it draws a rectangle with upper left corner wpoint1
    and lower right corner wpoint2. See _rectangle() for more information.

    Returns:    Nonzero value for success; 0 otherwise.

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