# constrain_point_on_rsketch ## API Definition ```python def constrain_point_on_rsketch(sketch: Sketch, point: Union[SketchRef, str], entity: Union[SketchRef, str], *, constraint_id: Optional[str] = None) -> Sketch ``` *Source: operations.py* ## Import Surface - top-level: `from simplecadapi import constrain_point_on_rsketch` ## Description Constrain a sketch point to lie on a line or circle.