Computer graphics processing and selective visual display system – Display peripheral interface input device – Cursor mark position control device
Patent
1992-11-30
1995-11-21
Don, Ulysses W.
Computer graphics processing and selective visual display system
Display peripheral interface input device
Cursor mark position control device
345159, 345160, G09G 302
Patent
active
054691915
ABSTRACT:
A cursor control system is provided whereby a discrete-direction input device, such as a joystick, may be used to accurately move a cursor in both straight and curved lines. The cursor control system may be implemented in software and is ideal for with an electronic drawing application having only a rudimentary joystick-like control and various user buttons. A cursor capable of indicating the direction of movement, such as an arrow, is provided and may be aimed with the joystick. During drawing or movement, depression of the joystick causes the arrow to rotate towards the selected direction at a fixed angular rate such that the arrow travels in a smooth arc. The control system may be arranged so that the rotation of the arrow stops when it has reached the selected direction or so that the arrow continues to rotate even after it has reached the selected direction. The former control method may be used for moving and the latter control method for drawing. A control may be provided to vary the forward speed of the arrow to thereby vary the radius of the arc.
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Fort Jeffrey W.
Smith, III Jay
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