1. A method for a graphical manipulation of a trajectory of an aircraft comprising the steps of: receiving an indication of a deformation point associated with the trajectory of the aircraft in a man machine interface; determining a zone of local modification of the trajectory of the aircraft as a function of the deformation point with an avionics computer; computing a modified trajectory with the avionics computer; receiving or determining a parameter associated with the indication of the deformation point with the avionics computer; selecting a computation algorithm with the avionics computer from among a plurality of predefined algorithms, said selection being performed as a function of the parameter associated with the indication of the deformation point; and graphically restoring said modified trajectory on the man machine interface.