Abstract Curve drawing in a graphics display system, whether open or closed figures are involved, under transformation, clipping, or mapping, includes testing to determine whether transformation is to be performed; transforming parametric equations for the figure to be transformed and drawn; testing to determine whether the figure to be drawn is to be clipped against predetermined clipping boundaries; computing an extent of the figure to be drawn; applying a box clip test for trivial clipping for the entire figure; rejecting those figures which are entirely outside the viewport as determined by the trivial clipping test; accepting the entire figure to be drawn which has been determined to be completely within the clipping box; mapping the parametric equations if mapping is required; generating line segments for the figure to be drawn.
Inventors
👤 Kirk Steffen Haskell
👤 Bob Chao-Chu Liang
Bibliographic Details
Application Number—
JurisdictionEP
Data Sourcegoogle_patents
Last Synchronized2026-10-31 07:18
CPC Classifications
G; G06; G06T; G06T15/00; G06T15/10; G06T15/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
A method for drawing a curve or a curved figure on a display device under potential transformation, clipping, or mapping, comprising the steps of: testing to determine whether transformation is to be performed; transforming parametric equations for the figure to be transformed and drawn; testing to determine whether the figure to be drawn is to be clipped against one or more clipping boundaries; computing an extent of the figure to be drawn; mapping the parametric equations if mapping is required; generating line segments for the figure to be drawn.
Claim 2
Independent Claim
89 words
A method for drawing a curve or a curved figure on a display device under potential transformation, clipping, or mapping, comprising the steps of: testing to determine whether transformation is to be performed; transforming parametric equations for the figure to be transformed and drawn; testing to determine whether the figure to be drawn is to be clipped against one or more clipping boundaries; computing an extent of the figure to be drawn; mapping the parametric equations if mapping is required; generating line segments for the figure to be drawn.
Claim 3
Dependent Claim
58 words
A method as claimed in claim 1, further comprising the steps of: applying a box clip test for trivial clipping for the entire figure; rejecting those figures which are entirely outside the viewport as determined by the trivial clipping test; accepting the entire figure to be drawn which has been determined to be completely within the clipping box.
Claim 4
Dependent Claim
13 words
A method as claimed in claim 1, wherein said curved figure is closed.
Claim 5
Dependent Claim
15 words
A method as claimed in claim 3, wherein said closed curved figure is a circle.
Claim 6
Dependent Claim
15 words
A method as claimed in claim 3, wherein said closed curved figure is an ellipse.
References Cited (Backward Citations)
No citation records indexed.
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