Method for converting non-zero winding to even-odd fill polygons

Details Method for converting non-zero winding to even-odd fill polygons Method for converting non-zero winding to even-odd fill polygons

1997-11-12

2000-08-29

Zimmerman, Mark K.

Computer graphics processing and selective visual display system

Computer graphics processing

Graph generating

345434, 345441, 345443, G06T 1180

Patent

active

061115878

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.

REFERENCES:
patent: 4958305 (1990-09-01), Piazza
patent: 5438656 (1995-08-01), Valdes et al.
patent: 5818460 (1998-10-01), Covey et al.

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