Apparatus and method for loading coordinate registers for use wi

Details Apparatus and method for loading coordinate registers for use wi Apparatus and method for loading coordinate registers for use wi

1990-10-16

1992-08-25

Harkcom, Gary V.

Communications: electrical

Land vehicle alarms or indicators

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

395133, 340727, 340747, G06F 15626

Patent

active

051426684

ABSTRACT:
Apparatus and method for using an index register which cycles modulo 4 for loading registers which contain coordinates of four vertices of quadrilateral objects, including degenerate quadrilateral objects, namely a point, a line and a triangle, which are to be displayed by a graphics display subsystem. In this manner, a software command need only define the minimum number of X,Y coordinate pairs to define the object, i.e., one coordinate pair for a point, two coordinate pairs for a line, three coordinate pairs for a triangle and two coordinate pairs for a rectangle (by defining opposite corners). Additionally, by using an index register according to the present invention, objects can be efficiently replicated.

REFERENCES:
patent: 4809201 (1989-02-01), Keklak
patent: 4811241 (1989-03-01), Liang
patent: 4835722 (1989-05-01), Clarke et al.

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