G - Physics – 06 – F
Patent
G - Physics
06
F
G06F 17/50 (2006.01) G06T 11/20 (2006.01)
Patent
CA 2475832
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.
L'invention concerne un procédé et un système de commande d'arc elliptique interactifs. Un utilisateur peut manipuler de façon interactive trois points, un point de commande central et deux points de commande focaux, afin de spécifier et de modifier les paramètres elliptiques impliqués. Le point de commande central permet de commander le rayon de l'ellipse dans la direction x, tout en maintenant constant le rapport entre le rayon de l'ellipse dans la direction y et le rayon de l'ellipse dans la direction x. Le point de commande central permet également de commander la relation entre l'indicateur de balayage et l'indicateur de grand arc impliqué. Les deux points de commande focaux permettent de commander le rapport entre le rayon de l'ellipse dans la direction y et le rayon de l'ellipse dans la direction x, l'angle entre l'axe des x du système de coordonnées et l'axe des x de l'ellipse, et la valeur de l'indicateur de balayage.
Computer Associates Think Inc.
Ridout & Maybee Llp
LandOfFree
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