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 _pie_w()                Draw a pie slice shape (window coords)

 #include   <graph.h>

 short _far _pie_w(control, x1, y1, x2, y2, x3, y3, x4, y4);
 short control          Fill control value: _GFILLINTERIOR or _GBORDER
 double x1, y1;         Upper left of bounding rectangle
 double x2, y2;         Lower right of bounding rectangle
 double x3, y3;         Start vector
 double x4, y4;         End vector

    _pie_w() is the window version of _pie(); it draws a pie slice
    on the screen using window coordinates. The slice is actually an
    elliptical arc whose center and both endpoints are joined by
    lines. See _pie() for more information.

    Returns:    Nonzero value for success; 0 otherwise.

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