module Geocoder::Calculations

def extract_coordinates(point)


running method and may return nil.
[lat,lon] array. Note that if a string is passed this may be a slow-
or an object that implements +to_coordinates+ and returns a
Takes an object which is a [lat,lon] array, a geocodable string,
# 
def extract_coordinates(point)
  case point
  when Array
    if point.size == 2
      lat, lon = point
      if !lat.nil? && lat.respond_to?(:to_f) and
        !lon.nil? && lon.respond_to?(:to_f)
      then
        return [ lat.to_f, lon.to_f ]
      end
    end
  when String
    point = Geocoder.coordinates(point) and return point
  else
    if point.respond_to?(:to_coordinates)
      if Array === array = point.to_coordinates
        return extract_coordinates(array)
      end
    end
  end
  [ NAN, NAN ]
end