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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _polygon functions draw polygons. The border of the polygon
     is drawn in the current color and line style. The _polygon
     routine uses the viewport coordinate system (expressed in
     _xycoord structures). The _polygon_wxy and _polygon_w routines use
     real-valued window coordinates (expressed in _wxycoord structures
     and in pairs of double-precision floating-point values,
     respectively).
 
     The argument <points> is an array of _xycoord or _wxycoord
     structures or pairs of doubles, each of which specifies one of
     the polygon's vertices. (For _polygon_w, <points>[0] and
     <points>[1] specify the <x> and <y> coordinates, respectively, of
     the first point.) If the first point does not equal the last
     point, the _polygon functions use them to provide a closing edge.
 
     The argument <numpoints> indicates the number of elements (the
     number of vertices) in the <points> array. The minimum number of
     points is 3, the maximum is 16,381.
 
     The <control> argument can be one of the following manifest
     constants: _GBORDER or _GFILLINTERIOR.
 
     The _setwritemode, _setlinestyle, and _setfillmask functions all
     affect the output from these functions.
 
     If you try to fill the polygon with the _floodfill function, it
     must be bordered by a solid line style.
 
     Return Value
 
     The _polygon, _polygon_w, and _polygon_wxy functions return a
     nonzero value if the polygon is drawn successfully; otherwise,
     they return 0.
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