Automatic highlighting in a raster graphics display system

Details Automatic highlighting in a raster graphics display system Automatic highlighting in a raster graphics display system

1985-09-06

1988-02-16

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340723, 340747, G09G 116

Patent

active

047258292

ABSTRACT:
In an interactive graphics display system in which pels in a frame buffer are mapped to the display screen of a raster display device, a method of automatically highlighting and de-highlighting graphic segments as a cursor is moved across the display screen comprises sampling a locator device at successive points in time to generate a screen cursor at corresponding positions on the screen, examining pels in the frame buffer along a line which extends from the pel corresponding to the previous cursor position to the pel corresponding to the current cursor position to determine whether a pel is "on" along the line, automatically performing a correlate operation in respect of the "on" pel (if any) to identify the graphic segment associated with that pel, and highlighting the segment so identified, any highlighted segment being de-highlighted prior to highlighting a different segment.

REFERENCES:
patent: 4464652 (1984-08-01), Lapson et al.
patent: 4586035 (1986-04-01), Baker et al.
patent: 4587520 (1986-05-01), Astle
patent: 4683468 (1987-07-01), Himelstein et al.
patent: 4686522 (1987-08-01), Hernandez et al.
Williams, Gregg; "The Lisa Computer System", Byte, Feb. 1983, pp. 33-50.
Patents Abstracts of Japan, vol. 7, No. 70 (P-185)[1215], Mar. 23, 1983; & JP-A-58 1232 (Hitachi Seisakusho KK.) 06-01-1983.

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