...now with an API that makes creation of simple maps easy.

You can now specify a path to follow, like "e200/s400/w200/n400", and that'll create a map with a line going from the origin east 200 units, south 400 units, west 200 units, and back north 400 unit. You can specify as complex a path as you want as long as it's closed and doesn't loop back on itself. Enjoy!

http://rubyforge.org/project/showfiles.php?group_id=135&release_id=209