Pre-drawing pick detection in a graphics display system
US5208909A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 1989 |
| Grant date | May 4, 1993 |
| Priority date | — |
| Expiry date | Oct 23, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/04842
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for detecting operator selection of a graphics object prior to rasterization and pixel generation for that object. The method divides the screen into regions and analyzes successive end points and vectors based upon their region to determine trivial picks and trivial no picks. Non-trivial conditions are analyzed by determining the position of the line segment being processed relative to two selected pick window vertices. Apparatus for implementing pick detect is provided that accomplishes pick detect as part of graphics pipeline processing. In the trivial pick or no pick cases, the apparatus does not slow pipeline operation, while in a non-trivial case, extra processing cycles are required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.