Hello,
I have this problem:
// a plane
gp_Pln plane = ...
// a collection of 3 points
Handle(TColgp_HArray1OfPnt2d) points = new TColgp_HArray1OfPnt2d(1,3);
points->SetValue(1, ... );
points->SetValue(2, ... );
points->SetValue(3, ... );
// a 2d interpolating curve
Geom2dAPI_Interpolate...