INCREMENTAL CONTROLLER FOR GRAPHICAL DISPLAYS

摘要

An incremental controller (12) for generating a supplemental positioning signal for use in a display system which includes a graphical positioning device (10) is disclosed. The controller includes an input device, for inputting desired supplemental positioning information. A code generator (24) generates a supplemental positioning signal in response to the supplemental positioning information. A switch (20) is connected to receive the positioning signal and the supplemental positioning signal. The switch outputs either the positioning or supplemental positioning signals in response to receiving a control signal. A controller (26) is connected to the switch for generating the control signal.