The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 29, 2000
Filed:
Nov. 12, 1997
Robert D Covey, Alameda, CA (US);
Ching-Chi Billy Hsu, Alameda, CA (US);
Autodesk, Inc., San Rafael, CA (US);
Abstract
The present invention discloses a method, apparatus, and article of manufacture for converting Non-Zero Winding to Even-Odd rule polygons, regardless of their shapes. Convex, concave, self-intersecting, and polygons with holes can all be converted from Non-Zero Winding to Even-Odd fill rule polygons. The invention accepts Non-Zero Winding fill polygons and computes all intersection points between the polygons. An initial intersection point between a first polygon and a second polygon is selected. The perimeter of either the first or second polygon is traced beginning from the selected intersection point. The trace switches between the perimeters of the first and second polygons as additional intersection points are reached during the tracing. The tracing is terminated when the selected intersection point is encountered by the tracing step. These steps are then repeated until all intersection points between the first and second polygons have been encountered.