Pattern data generating system

Details Pattern data generating system Pattern data generating system

1989-01-27

1991-07-02

Herndon, Heather R.

Boots, shoes, and leggings

340728, 340747, G06F 1566

Patent

active

050291068

ABSTRACT:
A pattern data generating system has a processor for writing in a bit map memory, on the basis of input data, points of all lines to be filled or painted along a scan direction which is one direction on the bit map memory. This writing is performed such that a point on each line is written as one of the two end points of the line thereof while a point, offset by one point in the scan direction, is written as the other of the two end points of the line. The pattern data generating system also has a pattern data generating circuit for, if w (w is a positive integer) points b0, b1, . . . , b(w-2), and b(w-1) are present on one scan line, writing EXOR of data of points b0, b1, . . . , b(j-1) at positions corresponding to points b(j) (j is not less than 0 and less than w). Similar EXOR data writing is performed by the pattern data generating circuit for all the scan lines. Then, pattern data, in which the area surrounded by the closed curve is filled or painted, is obtained.

REFERENCES:
patent: 4620288 (1986-10-01), Welmers
patent: 4831557 (1989-05-01), Murata
patent: 4887228 (1989-12-01), Robert
"Principles of Interactive Computer Graphics (Second Edition)", Newman et al.; McGraw-Hill, Inc., 1979, pp. 230-239.
"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.
Japanese Patent Publication No. 53-41017.
Japanese Patent Publication No. 53-15624.

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