How to achieve a polygonal pattern in a circle?

Hi Guys,

 I am trying to to figure out how to make a 7 sides polygon pattern in a circle boundary curve in. The problem is that my polygons are lining up at each point on the grid and overlapping each other. 

This is what I want to achieve, http://vimeo.com/32754171

and this is my attempt at it so far 2ndattemptICD.gh

Any help will be greatly appreciated.