Cut the polyline with boundary rectangle c#

[magicteddy]

Hi,

This is exactly replicating the Trim with Brep component.
Build a closed box from the rectangle, test for intersections, shatter the curve (curve.Split()) and select pieces that have their middle inside the box.

Partial border of combined curves

After the region union, you could also replicate the Trim with Brep GH component’s behaviour, which computes the intersections between the curve and a brep, shatters the curve using Curve.Split and then selects the piece of curve inside/outside the brep using Brep.IsPointInside. This may avoid dealing with seam problems, for the cost of computing an extrusion. [image] TrimWithBrep.gh (9.7 KB)