Given a set of co-ordinate points (which may be in a jumbled order),
i'd like to be able to display a polygon with a configured 'radius'
outside of it's borders (eg. 100 miles)

ie:
http://www.kangarooit.com/developer_blog/rounded_expanded_polygon_wanted.html

Is this possible?

One technique I was imagining was:

  for each point
    draw a circle around it
  for each edge  //haven't figured out how to calculate edges
    create a (rotated?) rectangle around it
  possible subsequent step: eliminate overlap

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