ClutterBehaviourBspline @clutterbehaviourbspline: the object which received the signal. @arg1: @parent_class: @knot_reached: @_clutter_bspline_1: @_clutter_bspline_2: @_clutter_bspline_3: @_clutter_bspline_4: @alpha: @knots: @n_knots: @Returns: @bs: @knot: @bs: @first_knot: @Varargs: @bs: @offset: @bs1: @bs2: @bs: @offset: @Returns: @bs: @bs: @offset: @knot: @bs: @knot: @bs: @knot: