affect curves with an attractor point?

I'm trying to affect these curves with an attractor point and trace the impact of the surfaces bulge through iso curves... similar to this: http://www.grasshopper3d.com/photo/vector-field-door-wip?context=user

I have figured out how to dispatch the points based on x coordinates so that I have two sets, one to distort left and the other right. I use the distance between the point grid and the attractor point to determine the move amount but I seem to be having the inverse outcome . I want the points closest to the attractor to move the most...? any help thx in advance