Reduced viewport for graphics display

Details Reduced viewport for graphics display Reduced viewport for graphics display

1988-08-04

1993-12-07

Oberley, Alvin E.

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

395127, 345139, G09G 100, G06F 314

Patent

active

052686779

ABSTRACT:
A reduced viewport feature for a graphics display system allows an operator to observe manipulations on a graphics display of video image planes that are wholly or partially outside a viewing area. A two-dimensional input image plane in the form of a wireframe is transformed to a three-dimensional image plane due to manipulation, such as rotation and/or translation. The resulting three-dimensional image plane is subsequently mapped as a two-dimensional projection onto the graphics display. Transformation matrix coefficients are multiplied by a variable reduction coefficient to cause all points of the image plane to converge toward the center of the graphics display, resulting in the ability to view space which originally was not visible to the operator on an output video monitor.

REFERENCES:
patent: 4295135 (1981-10-01), Sukonick
patent: 4549275 (1985-10-01), Sukonick
patent: 4725960 (1988-02-01), Shima et al.
patent: 4786897 (1988-11-01), Takanashi
patent: 4790028 (1988-12-01), Ramage
Artwick, B. A.; "Microcomputer Displays, Graphics, & Animation", Prentice-Hall, N.J., Englewood Cliffs, 1985, pp. 42-45, 38-39, 194-203, 204-225.

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