get points of intersection with the window’s boundary

[Aomandeyi]

excuse me, could anyone give me some advice about this problem？

[sloriot]

You can use the function draw_dual() from the triangulation.

Then use the intersection() function to clip the segments, rays and lines.

It is used in the CGAL ipelets here:
https://github.com/CGAL/cgal/blob/master/CGAL_ipelets/include/CGAL/CGAL_Ipelet_base_v7.h#L724

which is calling this function:
https://github.com/CGAL/cgal/blob/master/CGAL_ipelets/include/CGAL/CGAL_Ipelet_base_v7.h#L705

Here is the struct used as stream for draw_dual():
https://github.com/CGAL/cgal/blob/master/CGAL_ipelets/include/CGAL/CGAL_Ipelet_base_v7.h#L671