Automatic highlighting in a raster graphics display system
US4725829A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 6, 1985 |
| Grant date | Feb 16, 1988 |
| Priority date | — |
| Expiry date | Sep 6, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/04842
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.