Apparatus and method for reducing system overhead while inking s

Details Apparatus and method for reducing system overhead while inking s Apparatus and method for reducing system overhead while inking s

1991-10-10

1993-12-21

Oberley, Alvin E.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

178 18, 382 23, G09G 302

Patent

active

052724700

ABSTRACT:
The present invention reduces overhead processing of a data processing system by storing a predetermined number of points corresponding to the position of a pointing device as it moves on a workpad or other touch sensitive input device. A predetermined number of points are stored in a buffer, wherein the predetermined number is dependent upon the type of pointing device (e.g., finger, stylus, etc.) used with the workpad. The stored points are periodically displayed or inked on a visual display at a rate of at least 20 times per second. As a result, the user moving the pointing device receives both tactile and visual feedback information similar to that provided by a pencil used to make markings on a piece of paper. An alternative embodiment provides a similar reduction of overhead associated with erasing graphical information displayed on the visual display.

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