copy

Returns this object rebuilt around the replacement geometry segment — the hook the shape-preserving operations return through.

Every operation that moves a segment computes its result as a plain Segment and returns it through this hook. This base implementation returns segment itself; a subclass overrides it to rebuild an instance of its own class around segment, and every such operation then comes back as that class. The result's runtime class must equal the receiver's — the operations check it and fail with a named error when a subclass misses the override.

Parameters