Curve-generating device for visual display of symbols on a catho

Details Curve-generating device for visual display of symbols on a catho Curve-generating device for visual display of symbols on a catho

1980-01-28

1982-02-02

Smith, Jerry

Boots, shoes, and leggings

340732, 340739, 364719, G06F 3153

Patent

active

043143512

ABSTRACT:
The curve-generating device serves in particular to produce signals relating to a circular line from simple algorithms. The device comprises means for computing a parameter .DELTA.L defined by ##EQU1## where U is an elementary vector, .theta. is the angle at the center of a polygon of side U+.DELTA.L circumscribed about the circle R, and processing logic circuits for determining the polar direction P.sub.n of the plotted line according to the relation: ##EQU2## where

REFERENCES:
patent: 3696391 (1972-10-01), Peronneau
patent: 3728528 (1973-04-01), Walters
patent: 3921163 (1975-11-01), Giraud et al.
patent: 4023027 (1977-05-01), Strathman et al.
patent: 4115863 (1978-09-01), Brown

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