public static SKPath ToSKPath(DGraph2 g, Func <Vector2d, SKPoint> mapF)
{
SKPath p = new SKPath();
foreach (Index3i edge in g.Edges())
{
Vector2d a = g.GetVertex(edge.a);
Vector2d b = g.GetVertex(edge.b);
p.MoveTo(mapF(a));
p.LineTo(mapF(b));
p.Close();
}
return(p);
}