Processing method and graphics processor for skip drawing a figu

Details Processing method and graphics processor for skip drawing a figu Processing method and graphics processor for skip drawing a figu

1993-12-10

1996-12-03

Jankus, Almis R.

395134, 395139, G06T 1500

Patent

active

055817963

ABSTRACT:
In a case where a graphic image segment of which positional information is defined in a world coordinate system and of which size information is defined in a device coordinate system is developed to be displayed on a multi-window screen, the development processing performance is improved in peripheral portions of the window. A rectangular development area (first development area) associated with the window is expanded with consideration of a size information of a graphic segment so as to obtain a second development area. The second development area is compared with a rectangular area (an existence area) circumscribing a graphic image represented only with positional information of the graphic segment. As a result, whether or not the graphic segment is to be developed is determined. The first development area is reduced with consideration of size information of the graphic segment to produce a third development area. The third development area is compared with the existence area to decide whether or not the clipping operation is necessary for the graphic segment.

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patent: 4811241 (1989-03-01), Liang
patent: 4878183 (1989-10-01), Ewart
patent: 4982345 (1991-01-01), Callahan et al.
patent: 5031114 (1991-07-01), Yamagami

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