FLAG_KNOT_T_BREAK Break knot tangents.
FLAG_KNOT_LOCK_X Lock knot’s X movement.
FLAG_KNOT_LOCK_Y Lock knot’s Y movement.
FLAG_KNOT_T_LOCK_A Lock knot’s tangent angle.
FLAG_KNOT_T_LOCK_L Lock knot’s tangent length.
FLAG_KNOT_T_KEEPVISUALANGLE Keep visual angle between knot’s tangents.
ADD_KNOT_ADAPT_TANGENTS Tangents of new knots are set in such a way that the resulting spline will match the curvature of the original spline.