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     The _rectangle functions draw a rectangle with the current line
     style.
 
     The _rectangle function uses the view coordinate system. The
     view-coordinate points (<x1>, <y1>) and (<x2>, <y2>) are the
     diagonally opposed corners of the rectangle.
 
     The _rectangle_w routine uses the window coordinate system. The
     window-coordinate points (<wx1>, <wy1>) and (<wx2>, <wy2>) are the
     diagonally opposed corners of the rectangle.
 
     The _rectangle_wxy routine uses the window coordinate system. The
     window-coordinate points (<pwxy1>) and (<pwxy2>) are the
     diagonally opposed corners of the rectangle. The coordinates for
     the _rectangle_wxy routine are given in terms of a _wxycoord
     structure (defined in GRAPH.H).
 
     The _rectangle_w and _rectangle_wxy routines are implemented as
     macros.
 
     The <control> parameter can be one of the following manifest
     constants: _GBORDER or _GFILLINTERIOR.
 
     If the current fill mask is NULL, no mask is used. Instead, the
     rectangle is filled with the current color. If you try to fill the
     rectangle with the _floodfill function, the rectangle must be
     bordered by a solid line-style pattern.
 
     Return Value
 
     The function returns a nonzero value if the rectangle is drawn
     successfully; otherwise, it returns 0.
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