Voronoi C#

Hi,

I'm trying to create a voronoi diagram through C#
Since I can't find any information in the SDK I was hoping I could get some help here.

I would like to create a voronoi diagram (from a set of points) which is "trimmed" by a polyline. When I add the end points of the lines surrounding the surface it looks like in the picture attached. But I don't want these points to be a part of the voronoi partition, which they are now.

This is the solver I'm using.

Grasshopper.Kernel.Geometry.Voronoi.Solver.Solve_BruteForce(Node2List, IEnumerable<Node2>outline);

Thanks for any help,

Johanna