A graphics system comprises an input device, and a computer for detecting changes in the position of the input device relative to a surface, and a monitor (63) for displaying patterns which follow the movement of the input device. The computer calculates at least one differential derivative with respect to time of the input device position and controls characteristics of the display patterns in dependance upon the or each calculated derivative.
* 6081261 Manual entry interactive paper and electronic document handling and processing system
6181329 Method and apparatus for tracking a hand-held writing instrument with multiple sensors that are calibrated by placing the writing instrument in predetermined positions with respect to the writing surface
6492981 Calibration of a system for tracking a writing instrument with multiple sensors
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