Pattern generating method and apparatus

Details Pattern generating method and apparatus Pattern generating method and apparatus

1997-10-07

1999-09-28

Powell, Mark R.

Computer graphics processing and selective visual display system

Computer graphics processing

Graph generating

345441, G06T 1100

Patent

active

059596325

ABSTRACT:
A coordinate address is generated which specifies the position in a square original tile area where pattern data is to be written for each pixel, and a check is made to determine if the coordinate address is adjacent any one of sides of the original tile area. When the written pixel is adjacent any one of sides of the original tile area, the position of a pixel is calculated which is adjacent the written pixel on another tile area adjacent the original tile area along that side, and the position of the adjacent pixel when the adjacent tile area is laid on the original tile area is calculated as a shifted position of the adjacent pixel. The positions of the written pixel and the shifted position are rotated predetermined angle about the center of a polygon at least once to obtain rotational positions. Pixel values are additionally written at these shift and rotational positions.

REFERENCES:
patent: 5295237 (1994-03-01), Park
patent: 5428719 (1995-06-01), Sato
patent: 5577182 (1996-11-01), Hayashi
patent: 5751293 (1998-05-01), Hashimoto et al.
Xia, Weixin, et al., "Periodic Pattern Graphics", Computers & Graphics, vol. 18, No. 1, pp. 81-86, 1994.
Fournier, Alain, et al., "Computer Rendering of Stochastic Models", Communications of the ACM, vol. 25, No. 6, pp. 371-384, Jun. 1982.

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