Graphic display apparatus with a vector generating circuit

Details Graphic display apparatus with a vector generating circuit Graphic display apparatus with a vector generating circuit

1983-05-24

1986-04-01

Thomas, James D.

Boots, shoes, and leggings

340732, 364521, 364900, G06F 300, G06F 15626, G09G 106

Patent

active

045802360

ABSTRACT:
A graphic display apparatus for generating a vector comprises registers for storing a value R of a vector discrimination, a positive increment P and a negative increment N, and flip-flops for storing magnitude information of .DELTA.X, .DELTA.Y, and .DELTA.X and .DELTA.Y. An address counter of a refresh memory is counted up or down in accordance with the contents of those flip-flops. A control circuit for updating the value R of the vector discrimination is also provided, so that the vector can be generated at a high speed. The registers and the flip-flops are constructed in two stages so that data for generating the next vector can be prepared while the current vector is generated.

REFERENCES:
patent: 3883728 (1975-05-01), Schwartz et al.
patent: 3906480 (1975-09-01), Schwartz et al.
patent: 4163286 (1979-07-01), Reins et al.
patent: 4272808 (1981-06-01), Hartwig
patent: 4445115 (1984-04-01), Rudgard
patent: 4491836 (1985-01-01), Collmeyer et al.
Bresenham, "Algorithm for Computer Control of a Digital Plotter", IBM Systems Journal, vol. 4, #1, pp. 25-30, 1965.

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