Apparatus for shaping figures to be point symmetrical

Details Apparatus for shaping figures to be point symmetrical Apparatus for shaping figures to be point symmetrical

1996-05-31

1998-10-13

Jankus, Almis R.

Computer graphics processing and selective visual display system

Computer graphics processing

G06T 300

Patent

active

058219382

ABSTRACT:
If a polygon having an even number of vertexes, which are 2n in number, is input, a middle point calculation unit 24 pairs the m-th and (m+n)-th vertexes together, and calculates the coordinates of the middle points on the line segments between the vertexes of the respective pairs, which are n in number. A centroid calculation unit 25 calculates the coordinates of the centroid of the middle points. A distance calculation unit 26 calculates the distances between the centroid and the middle points. If all the distances between the centroid and the middle points are within a specified allowable range, a symmetry decision unit 27 sets the centroid as the center of point symmetry. If the centroid is selected as the center of point symmetry, a symmetrizing unit 28 corrects part or all of the vertexes to symmetrize the polygon with respect to the centroid.

REFERENCES:
patent: 4989257 (1991-01-01), Horowitz

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