Computer graphics processing and selective visual display system – Computer graphics processing – Shape generating
Reexamination Certificate
2005-11-22
2005-11-22
Luu, Matthew (Department: 2672)
Computer graphics processing and selective visual display system
Computer graphics processing
Shape generating
C345S441000
Reexamination Certificate
active
06967654
ABSTRACT:
An interactive elliptical arc control system and method are disclosed. Three control points are provided—a center control point and two foci control points—that a user can interactively manipulate in order to specify and change the elliptical parameters involved. The center control point can control the radius of the ellipse in the x direction, while keeping constant the ratio of the radius of the ellipse in the y direction to the radius of the ellipse in the x direction. The center control point can also control the relationship of the sweep flag to the large arc flag involved. The two foci control points can control the ratio of the radius of the ellipse in the y direction to the radius of the ellipse in the x direction, the angle from the x-axis of the coordinate system to the x-axis of the ellipse, and the value of the sweep flag.
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Computer Associates Think Inc.
Fish & Richardson P.C.
Luu Matthew
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