========
Proc Pie	
========

The following is an alphabetical list of the Pie 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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Field:	 dfield (M) 	:	 	:	 		**
  Data field for numbers describing size of sections.  Numbers should
  be percentages, e.g. 100 corersponds to the entire circle.
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Center:	 coordpair 	:	4.0 5.5 :	 
  Location of center, in absolute units. 
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Radius:	 0 to 5 	:	  3 	:	 
  Radius of pie, in absolute units.
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Shade:	 color list20 	:	 	:	 
  Shades of pie sections.  One should be specified for each section.
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Linethick: 0 to 10 	:	 1 	:	 
  Thickness of section outlines.
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Explode:   0 to 3 	:	 0.1 	:	 
  Distance in abs units to 'explode' each piece.
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Rotate:	 0 to 360 	:	 0 	:	 
  Rotate entire pie this many degrees counterclockwise.  This is handy
  for final appearance.
-----------------------------------------------------------------------

# Produces a pie graph.  Shaded and/or 'exploded' sections can be
# done.  Unlike most other types of plots, the pie graph operates
# strictly in absolute units, so no graphics area needs to be defined.
# Use the "Rotate" paramter to adjust the pie to the desired position.
# There is no built-in way to label sections-- use vipl to add 
# annotations.
