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Proc Polygon
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The following is an alphabetical list of the Polygon parameters.
Given are: the parameter name; the parameter data type; a default
value if any; and a description.  Especially important parameters
have a "**" in the right margin.

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Linetype:	0 to 8				: 0		
  Line dash pattern for outline.
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Linetype.magnify: 0.1 to 10			: 1		
  Magnification of patterns for outline.
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Linethick:	0.1 to 10			: 1		
  Thickness of line for outline.
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Outline:	{y,n}				: n		
  Allows outlining of polygon with a line.
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Points:		text (M) (C)			:		**
  This is where the points describing the polygon boundary get
  specified.  There should be one coordinate pair per line. 
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Rectangle:	2coordpair			:		
  Convenient way to specify a rectangle.  Give two coordinate
  pairs (on the same line), one for the lower-left and one for
  the upper-right.
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Shade:		color				: 0.5		
  The shade of the polygon goes here.
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System:		{data,absolute}			: absolute	
  Allows either the absolute or the data coordinate system 
  to be used for specifying points.
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#
# Creates a shaded rectangle or convex polygon, optionally outlined.
# Should add Position, so that a polygon can be replicated
