Method and apparatus for clipping and determining color factors

Details Method and apparatus for clipping and determining color factors Method and apparatus for clipping and determining color factors

Filed on

1993-09-02

Date issued

1997-03-18

Examiner

Jankus, Almis R.

Other Related Categories

G06T 1530

Type

Patent

Status

active

Patent number

056130520

Description

ABSTRACT:
A method for clipping a graphical polygon to a clip region, the polygon being defined by multiple vertices with connecting edges, including the steps of computing which vertices of a polygon to be displayed may be discarded and computing at least one color factor only for vertices not discarded, computing boundary vertices on any edges intersect a clip region boundary and computing at least one color factor therefor, and displaying the vertices according to the computed color factors. In addition, an apparatus for clipping a graphical polygon to a clip region, the polygon being defined by multiple vertices with connecting edges, including apparatus for computing which vertices of a polygon to be displayed may be discarded and for computing at least one color factor only for vertices not discarded, apparatus for computing boundary vertices on any edges that intersect a clip region boundary and for computing at least one color factor therefor, and apparatus for displaying said vertices according to the computed color factors.

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ACM Transactions on Graphics, vol. 11, No. 3, Jul. 1992, "A New, Fast Method for 2D Polygon Clipping: Analysis and Software Implementation", P. Maillot, pp. 276-290.
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IBM Technical Dislosure Bulletin, vol. 27 No. 1B Jun. 1984. Line Clipping In Interactive Computer Graphics, I. F. Brackenbury, pp. 549-552.

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