CPAN::Groonga

C_mqNvxq`@
  print $eline->{levels};      # POP

  # in Javascript, assuming eline was encoded as JSON:
  # ... load GMap2 ...
  var opts = {
    points: eline.points,
    levels: eline.levels,
    nu

num_levels => int($num_levels),
   zoom_factor => int($zoom_factor),
  };

You can then use the L<JSON> modules (or XML, or whatever) to pass the encoded
values to your Javascript application for use 

/GoogleMaps/EncodePolyline/PolylineEncoderClass.html>
(JavaScript implementation),
L<http://www.usnaviguide.com/google-encode.htm> (similar implementation in perl),
L<Geo::Google>,
L<JSON::Any>

=cut