Method and system for directly drawing a convex polygon having a

Details Method and system for directly drawing a convex polygon having a Method and system for directly drawing a convex polygon having a

1994-12-21

1996-10-08

Jankus, Almis R.

395126, 395133, G06T 1100

Patent

active

055639950

ABSTRACT:
A polygon drawing system for drawing a polygon at a high speed on such a display as a CRT display for use in computer graphics or the like, while eliminating the need for separating the polygon into triangles, includes a polygon vertex register for previously temporarily storing therein polygon vertex data on a draw polygon, a vertex manager for controllably causing the polygon vertex register to store therein the polygon vertex data under a predetermined condition, a start point register for sequentially monitoring the polygon vertex data being input, determining one of the polygon vertex data to be used as a drawing start vertex and previously temporarily storing the determined polygon vertex data therein, an outline generator for sequentially controlling a sequence of generating an outline of the polygon, a vertex address up counter for outputting to the polygon vertex register an address at which next clockwise polygon vertex data is stored according to the outline of the polygon, a vertex address down counter for outputting to the polygon vertex register an address at which next counterclockwise polygon vertex data is stored according to the outline of the polygon, interpolaters for performing interpolating operation over clockwise and counterclockwise outlines on the basis of the polygon vertex data indicated by the vertex address up and down counters, and a line drawer for drawing a polygon interpolate span with its both ends corresponding points of the clockwise and counterclockwise outlines obtained by the interpolaters. A method is also provided.

REFERENCES:
patent: 5422991 (1995-06-01), Fowler

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