Method of finding and painting a region of a graphics figure

Details Method of finding and painting a region of a graphics figure Method of finding and painting a region of a graphics figure

1994-12-16

1995-09-12

Jankus, Almis R.

395129, 395143, G06T 1100

Patent

active

054505348

ABSTRACT:
In a method of painting a graphic in accordance with an even-odd rule, a painting region is judged by calculating data such as an intersection point count, a direction value, and a horizontal flag of respective intersection points; calculating a sum of direction values and a sum of horizontal flags of each intersection point based on the above data; calculating a post-operation intersection point count based on the intersection point count, the sum of direction values, and the sum of horizontal flags; and sequentially adding the post-operation intersection point counts from the scanning start point, so that the added value, either an even number or an odd number, serves as a basis for the judgment. Since the inside region or outside region of a graphic can be judged by referencing the sum of direction values and the sum of horizontal flags, even graphic figures having overlapping horizontal paths can be painted correctly.

REFERENCES:
patent: 5016001 (1991-05-01), Minagawa et al.

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