Patent
1996-07-29
1997-04-15
Nguyen, Phu K.
G06F 1500
Patent
active
056218656
ABSTRACT:
The present invention relates to a graphics processing apparatus for plotting three-dimensional graphics by using a grid, and to a method of use of the apparatus. An arbitrary plane grid is displayed on a display screen, the displayed grid is variously changed and the three-dimensional graphic is plotted using the changed grid. The possible changes of the grid include a grid translation, a grid spacing change, a grid rotation, the selection of a grid display
on-display mode, coincidence
on-coincidence of the reference points of the graphic with the grid, and the like. Also, the apparatus executes a corner processing, including arc processing and straight line processing. In the arc processing, the corner processing is executed by selecting two straight lines and inputting a radius to define a corner joining the two lines; and in the straight line processing, the corner processing is executed by selecting two straight lines and inputting the length and angle of a line segment to join them.
REFERENCES:
Evolution Computing; Easycad; Version 1.08; Jun. 1987; pp. 41-42, 61-62, 119-119, 179, 226-229.
Fuller, James E.; Using Autocad: Release 10 with 3-D; Third Edition; 1989; pp. 1-2 to 1-3, 5-1 to 5-3; 6-14 to 6-15, 8-6 to 8-7, 11-9 to 11-10, 11-24 to 11-25, 18-4 to 18-8, 18-13.
Abe Toshio
Iwamoto Naoki
Sakai Hiroyuki
Canon Kabushiki Kaisha
Nguyen Phu K.
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