Circle/graphics CRT deflection generation using digital techniqu

Registers – Transfer mechanism – Traveling pawl

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340324A, G06F 314

Patent

active

040230279

ABSTRACT:
A system for generating respective X and Y beam deflection command signals as respective running binary counts in X and Y deflection counters utilizing digital computations based on the straight line expressions Y=X tan .alpha., where .alpha. is the line slope. Relative clock rates are defined by the tan .alpha. relationship therebetween, and, by defining a line as lying in one of eight 45.degree. octants, and a circle as successive points of tangency of a plurality of lines tangent to the circle comprising circumferential segments in eight contiguous ones of the octants, the system effects generation of respective X and Y counts to trace a line of selected length and slope as well as a circle of selected radius utilizing but a single table of tangents for angles between 0.degree. and 45.degree. as the required data storage.

REFERENCES:
patent: 3493732 (1970-02-01), Zeheb
patent: 3510865 (1970-05-01), Callahan et al.
patent: 3763363 (1973-10-01), Saita et al.
patent: 3794993 (1974-02-01), Christopher
patent: 3898448 (1975-08-01), Clark
patent: 3938130 (1976-02-01), Burnham et al.

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