Graphic-shaping method and apparatus for producing axissymmetric

Details Graphic-shaping method and apparatus for producing axissymmetric Graphic-shaping method and apparatus for producing axissymmetric

1996-11-07

1998-10-06

Jankus, Almis R.

Computer graphics processing and selective visual display system

Computer graphics processing

Shape generating

G06T 300

Patent

active

058184589

ABSTRACT:
A method and apparatus for determining symmetry of a graphic includes determining a feature of an inputted graphic, the feature including coordinates of vertexes of the graphic, the vertexes including ends of graphic lines of the graphic. Thereafter, symmetry axes are formed through the graphic, and a symmetry axis is selected from the symmetry axes. Line segments are formed between pairs of opposing vertexes of the vertexes, and the distances are measured between midpoints of the line segments and a point where the line segment crosses the selected symmetry axis. Angles are determined between the selected symmetry axis and the line segments, and it is determined whether the selected symmetry axes is a valid symmetry axis. The number of the valid symmetry axes are counted, and inter-axial angles between adjacent valid symmetry axes are measured when the number of valid axes is greater than two. Thereafter, it is determined whether the graphic is a symmetric graphic by determining whether the inter-axial angles are within a predetermined range of angles. When the graphic is not a symmetric graphic, the feature of the graphic is modified such that the inter-axial angles become within the predetermined range.

REFERENCES:
patent: 5555357 (1996-09-01), Fernandes et al.

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