Straight line drawing control apparatus

Details Straight line drawing control apparatus Straight line drawing control apparatus

1989-12-28

1991-01-22

Evans, Arthur G.

Boots, shoes, and leggings

340799, G06K 100

Patent

active

049875531

ABSTRACT:
A straight line drawing control apparatus includes a first first-in first-out memory for inputting coordinate data indicative of coordinates of a straight line to be drawn in synchronism with a first write clock and inputting write data relating to luminance and/or color of the straight line in synchronism with a second write clock and for outputting the coordinate data in synchronism with a first read clock and outputting the write data in synchronism with a second read clock. The coordinate data, the write data and the first and second write clocks are supplied from an external device. The apparatus further includes a second first-in first-out memory for inputting flag data indicating a change of the write data in synchronism with the first clock and for outputting the flag data in synchronism with the first read clock, and a controller for generating the first read clock and for generating the second read clock only when the flag data is supplied from the second first-in first-out memory.

REFERENCES:
patent: 4303986 (1981-12-01), Lars
patent: 4788536 (1988-11-01), Tanabe

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