Computer graphics processing and selective visual display system – Display peripheral interface input device – Stylus
Patent
1993-12-15
1996-07-09
Brier, Jeffery
Computer graphics processing and selective visual display system
Display peripheral interface input device
Stylus
345156, 178 18, G09G 302
Patent
active
055348939
ABSTRACT:
A stylus-aware computer system and method are provided for processing information obtained by moving a stylus over a tablet of the type that displays images as well as inputs stylus information. As a user moves the stylus with respect to the tablet, the tablet generates outputs describing the position of the stylus with respect to the tablet. A tablet driver converts this data into standardized packet objects recognized by the computer system and sends the packet objects to a stroke manager. The stroke manager converts the package objects to stroke objects which represent the trajectory of the stylus with respect to the tablet at times between two transitions such as placing the stylus on the tablet and lifting the stylus off the tablet. The stroke manager notifies an application of the stroke object through an event queue. The application may then issue stroke commands which dictate how the stroke is used. The stroke may, for example, be drawn on the tablet, erased from the tablet, removed from memory, etc.
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Gough Michael L.
Hansen, Jr. Daniel J.
Hollowell J. Rhoads
Apple Computer Inc.
Brier Jeffery
Chow Doon
LandOfFree
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