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 _arc_w()                Draw an arc (window coords)

 #include   <graph.h>

 short _far _arc_w(x1, y1, x2, y2, x3, y3, x4, y4);
 double x1, y1;         Upper left of bounding rectangle
 double x2, y2;         Lower right of bounding rectangle
 double x3, y3;         Second point of start vector
 double x4, y4;         Second point of end vector

    _arc_w() is the window version of _arc(); it draws an arc on the
    screen bounded by the window coordinates (x1, y1) and (x2, ,y2).
    The start vector goes from the center of the bounding rectangle to
    (x3, y3), and the end vector goes from the center of the bounding
    rectangle to (x4, y4). See _arc() for more information.

    Returns:    Nonzero value for success; 0 otherwise.

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