System and method for generating variable width lines

G - Physics – 06 – T

Patent

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G06T 11/20 (2006.01) G06F 3/033 (2006.01)

Patent

CA 2072774

There is disclosed a video graphics system and method for creating variable width lines such that the lines may be easily edited. As a line image is created, a center point of that image along its length is temporarily established having width information at various points. This width information is used to create an outline of image of the desired shape, the outline having point data spaced at intervals. This point data can then be edited by a user to create different shapes. In situations where a pressure sensitive stylus is used to create the variable length line, a look-back technique is employed to insure that the line remains wide at the end point even though the user is reducing pressure as the system is removed from the pad.

L'invention est constituée par un système et une méthode graphique vidéo de production de traits de largeur variable faciles à éditer. Quand une image est créée, un point central contenant des informations de largeur sur une pluralité de points est temporairement établi dans le sens longitudinal de cette image. Ces informations sont utilisées pour créer le contour désiré de l'image, ce contour ayant des données de points espacés les uns des autres. Ces données peuvent être éditées par l'utilisateur pour créer des contours différents. Dans les systèmes ayant recours à un stylet sensible à la pression pour tracer les traits de longueur variable, une méthode rétrospective est utilisée pour garantir que la ligne restera large à l'extrémité terminale même si l'utilisateur réduit sa pression quand le système est enlevé du bloc.

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