Run slice line draw engine with non-linear scaling capabilities

Details Run slice line draw engine with non-linear scaling capabilities Run slice line draw engine with non-linear scaling capabilities

1995-04-13

1997-08-12

Jankus, Almis R.

395142, 395143, G06T 300

Patent

active

056574355

ABSTRACT:
A graphics controller for use in a computer system includes a run slice line draw engine to generate a line as a plurality of slices. The run slice line draw engine can perform non-linear scaling and shading of lines in accordance with a parametric equation by approximating the parametric equation as a polyline with a plurality of linear segments. The polyline approximation can be generated using information concerning each derivative of the parametric equation. Each linear segment of the polyline includes a plurality of slices generated by the run slice line draw engine. By approximating the polyline as a plurality of linear segments, non-linear scaling and/or shading by the run slice line draw engine can be performed without complex mathematical computations.

REFERENCES:
patent: 5400077 (1995-03-01), Cookson et al.
patent: 5444825 (1995-08-01), Bain et al.
IBM Technical Disclosure Bulletin, vol. 21, No. 5, Oct. 1978, pp. 2041-2044.
IBM Technical Disclosure Bulletin, vol. 22, No. 8B, Jan. 1980, pp. 3744-3747.
IBM Technical Disclosure Bulletin, vol. 18, No. 4, Sep. 1975, pp. 1075-1077 .

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