Pattern data generating system

Details Pattern data generating system Pattern data generating system

1989-01-27

1991-05-14

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340744, 364521, G09G 114

Patent

active

050160010

ABSTRACT:
A pattern data generating system comprises first and second bit map memories, a first control block for sequentially generating points corresponding to the boundaries of a closed curve in response to changes dx and dy along x and y directions, and writing the points in the first bit map memory, a second control block for sequentially generating points, which are required to paint an area enclosed by the closed curve, on the basis of the changes dx and dy, in accordance with a predetermined rule, and writing the points in the second bit map memory, a third control block for, if w (w is a positive integer) points b0, b1, . . . , b(w-2), and b(w-1) are present on a single scan line provided that one direction is set to be a scan direction on the second bit map memory, sequentially writing EXOR data of the points b0, b1, . . . , b(j-1) (j is not less than 0 and less than w) at positions corresponding to points b(j), and a fourth control block for obtaining pattern data by final filling or painting in which an arithmetic operation (e.g., logical OR or logical AND) of data of an arbitrary point in the first bit map memory with data of a corresponding point in the second bit map memory which stores the EXOR data is performed.

REFERENCES:
patent: 4396989 (1983-08-01), Fleming et al.
patent: 4677575 (1987-06-01), Redin
patent: 4791582 (1988-12-01), Ueda et al.
patent: 4815009 (1989-03-01), Blatin
"Principles of Interactive Computer Graphics", W. M. Newman, R. F. Sproull, McGraw-Hill, 1979, pp. 230-239, 315-331.
"The Edge Flag Algorithm--A Fill Method for Raster Scan Displays", B. D. Ackland, N. H. Weste, IEEE Transactions on Computers, vol. 30, No. 1, Jan. 1981, pp. 41-47.

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