closest line to curve

Hey everybody,

i'm a absolute beginner in grasshopper and try to write a script for a voronoi project, so sorry for unqualified questions.

my current problem is:

i generated a voronoi box, created a curve along certain points of the voronoi diagram and this curve is now intersecting to my voronoi surfaces.

i would like to create now a path inside the voronoi, out of the closest cell border lines to the curve.

How can i do that?

My idea:

To explode the voronoi construct, to convert the voronoi cell surfaces into lines, and use the closest point to point command?!?

But how to do :-)

I'm very thankful for any hint.

Thank you so far.

Cheers 

Seni