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EP0232005A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Curve drawing in a graphics display system

Assignee: International Business Machines Corp
•
Filing: 1987-01-08
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Granted: —
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Expires: 2007-01-08
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Abstract

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 —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-31 02:40
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.

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