Clipping process and processor

Details Clipping process and processor Clipping process and processor

1989-05-22

1990-11-20

Evans, Arthur G.

Boots, shoes, and leggings

364518, 340723, G06F 300

Patent

active

049723308

ABSTRACT:
A clipping processor clips a two-dimensional subject figure against a clip region by first scan-converting the clip region and storing it as endpoint data of clip segments, then scan-converting the subject figure, clipping the subject segments a scan line at a time against each of the clip segments on that scan line, and converting the clipped segments to pixel data. The clipping process is thus efficiently combined with the standard processes of scan conversion and pixel generation, producing clipped data that are ready for raster output. The clipping process is moreover performable by simple, rapid DDA algorithms, even when the clip region is bounded by high-order curves such as Bezier curves and spline curves, and can easily be implemented in high-speed, dedicated hardware.

REFERENCES:
patent: 4412296 (1983-10-01), Taylor
patent: 4888712 (1984-12-01), Barkans et al.
"Fundamentals of Interactive Computer Graphics", by James D. Foley and Andries Van Dam, pp. 450-456; The Addison Wesley Publishing Company, 1984.

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