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 _rectangle_w()          Draw a rectangle (window coords)

 #include   <graph.h>

 short _rectangle_w(control, wx1, wy1, wx2, wy2);
 short control;         _GBORDER or _GFILLINTERIOR
 double wx1, wy1;       Upper left of rectangle
 double wx2, wy2;       Lower right of rectangle

    _rectangle() is the window coordinates version of _rectangle(); it
    draws a rectangle with upper left corner (wx1, wy1) and lower
    right corner (wx2, wy2). 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