copy
Returns this object rebuilt around the replacement geometry flatPoint — the hook the shape-preserving operations return through.
Every operation that moves a flat point computes its result as a plain FlatPoint and returns it through this hook. This base implementation returns flatPoint itself; a subclass overrides it to rebuild an instance of its own class around flatPoint, 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.
Return
flatPoint itself; an override returns its own class rebuilt around flatPoint.
Parameters
flatPoint
The replacement geometry.