Find area of hatch. May create a new method in under Info
Squashed commit of the following:

commit 7fcd7750e8d36521042def2aceed0a6e087bf3f6
Author: Dongxu Li <dongxuli2011@gmail.com>
Date:   Sat Aug 2 01:45:02 2014 -0400

    file cleanup

commit a6cfcab35cd71b112c389d22c816e3da9d493b4d
Author: Dongxu Li <dongxuli2011@gmail.com>
Date:   Sat Aug 2 01:35:28 2014 -0400

    fixed arc area

commit 47ede894cb38351e00e8f26027c88e0910d36ad7
Author: Dongxu Li <dongxuli2011@gmail.com>
Date:   Fri Aug 1 01:23:59 2014 -0400

    show hatch area

commit 08ef998ff1f2d302d984539371017ac9f2b41c67
Author: Dongxu Li <dongxuli2011@gmail.com>
Date:   Mon Jul 28 23:35:47 2014 -0400

    area