Appeal No. 2000-0766
Application No. 08/825,259
identified by a two-axis coordinate system, so that each pixel lies at the
intersection of a coordinate line from each of the axes, for displaying a
line segment having arbitrary endpoints referenced to the same
coordinate system, the display operating under control of a digital
computer, wherein the improvement comprises:
(a) means for determining as a major axis the axis of the
coordinate system with respect to which the line moves most, and for
defining the other one of the axes as the minor axis;
(b) intersection means for identifying the major coordinate lines, if
any, crossing the line segment to be displayed, based only upon the major
axis coordinates of the endpoints of the line segment and
(c) pixel selection means for, with respect to each crossing found
by the intersection means, selecting for display a pixel that both (i) lies on
the major axis coordinate line at the crossing and (ii) has a minor axis
coordinate that is closest to the line segment.
The examiner relies on the following reference:
Foley et al. (Foley), “Computer Graphics: Principles and Practice, Second
Edition”, pp. 72-79, published by Addison-Wesley Publishing Company
(Nov., 1993).
Claims 1-12 stand rejected under 35 U.S.C. § 103 as unpatentable over Foley.
Reference is made to the briefs and answer for the respective positions of
appellant and the examiner.
OPINION
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