Method and apparatus for generating high-quality pattern in acco

Details Method and apparatus for generating high-quality pattern in acco Method and apparatus for generating high-quality pattern in acco

1994-11-08

1995-06-27

Jankus, Almis R.

395120, 395133, 395143, G06T 1140

Patent

active

054287197

ABSTRACT:
A projection section sequentially determines lattice points one by one in response to an input projection start command while the lattice points for approximating segments constituting a line drawing in units of segments have an 8-point connecting relationship, determines a change in state of a winding number of a plot-target-lattice point on the basis of a lattice point moving direction determined by a mutual position relation between the present plot-target-lattice point and its adjacent lattice points for approximating the segment, computes a tangential vector or its components of the present plot-target-lattice point and its adjacent segments, determines the next plot-target-lattice point, projects input size-changed edge lines in a code pattern memory in units of points while the winding number (WN) codes of the corresponding points stored in the code pattern memory are updated by the WN codes determined in units of points, and generates a projection completion response when projection of the size-changed edge lines is completed.

REFERENCES:
patent: 4298945 (1981-11-01), Kyte et al.
patent: 4815009 (1989-03-01), Blatin
patent: 4998211 (1991-03-01), Hamada et al.
patent: 5053759 (1991-10-01), Sato
Postscript.RTM. Language Reference Manuel, Adobe Sys., Inc. (1985) pp. 69-71.
W. M. Newman & R. F. Sproull, Principles of Interactive Computer Graphics (2d ed. 1979) pp. 20-28.

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