Pre-drawing pick detection in a graphics display system

Details Pre-drawing pick detection in a graphics display system Pre-drawing pick detection in a graphics display system

1989-10-23

1993-05-04

Harkcom, Gary V.

395134, 395143, G06F 1562, G06F 314

Patent

active

052089096

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.

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IBM Technical Disclosure Bulletin (IBM TDB), vol. 29, No. 5, Oct. 1986, "Method of Correlating on Areas in an Interactive Display System", pp. 1953-1954.
Brackenbury, IBM TDB, vol. 27, No. 1B, Jun. 1984, "Line Clipping in Interactive Computer Graphics", pp. 549-552.

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