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 _floodfill_w()          Fill area with color (window coords)

 #include   <graph.h>

 short _floodfill_w(wx, wy, boundary);
 double wx, wy;         Origin point to start fill at
 short boundary;        Boundary color of region to color

    _floodfill_w() is the window coordinates version of _floodfill();
    it fills an area of the window with the current color and fill
    mask, starting at the point (wx, wy) and bounded by color boundary.
    See _floodfill() for more information.

    Returns:         Nonzero value for success; 0 otherwise.

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