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  Include:  FGRAPH.FI, FGRAPH.FD
 
  Type:     INTEGER*2 FUNCTION
 
  Routine:  pie( control, x1, y1, x2, y2, x3, y3, x4, y4 )
            INTEGER*2 control, x1, y1, x2, y2, x3, y3, x4, y4
 
            pie_w( control, wx1, wy1, wx2, wy2, wx3, wy3, wx4, wy4 )
            INTEGER*2 control
            DOUBLE PRECISION wx1, wy1, wx2, wy2, wx3, wy3, wx4, wy4
 
            control: $GFILLINTERIOR, $GBORDER
 
  Returns:  a nonzero value if the pie is drawn successfully, or
            0 if not.
 
  See also: arc, ellipse, floodfill, getarcinfo, getcolor,
            lineto, rectangle, setcolor, setfillmask
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