Boots – shoes – and leggings
Patent
1990-05-07
1991-08-13
Harkcom, Gary V.
Boots, shoes, and leggings
364522, 340747, 340723, G06F 1562, G09G 114
Patent
active
050401300
ABSTRACT:
A method for clipping a line segment boundary-defined area against a limiting plane is disclosed for use in a computer graphics display system wherein graphics figures are represented by random sets of polylines definitive of line segment boundary-defined areas. Pursuant to the clipping method, once two intersection points are generated against one plane, the points are connected to form an edge of the new clipped boundary-defined area. The order of intersection point connection is irrelevant to the invention and the method can accomodate discontinuously presented data as readily as continuously presented data. Implementing the method essentially requires only one register to store the first intersection point and a flag register to indicate the status of the present clip point, i.e., whether the clipped point is the first or second of two points to be paired. In another aspect of the invention, an improved extraneous edge deletion method is provided capable of deleting extraneous lines formed as a result of a line segment boundary-defined area being clipped against a limiting plane. Pursuant to the method, clipped X-axis and Y-axis extraneous edges are eliminated during area fill processing in the graphics display system.
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Chang Fu-Chung
Donnelly James A.
Lindgren Terence W.
Marino Richard A.
Bayerl Raymond J.
Harkcom Gary V.
International Business Machines - Corporation
Kinnaman Jr. William A.
Walker Mark S.
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