Reactor-based viewport clipping using arbitrary graphical...

Details Reactor-based viewport clipping using arbitrary graphical... Reactor-based viewport clipping using arbitrary graphical...

2005-01-25

2005-01-25

Huynh, Ba (Department: 2179)

Data processing: presentation processing of document, operator i

Operator interface

On-screen workspace or object

C345S215000, C345S215000, C345S215000, C345S215000, C345S215000

Reexamination Certificate

active

06848082

ABSTRACT:
Arbitrary graphical entities are used for reactor-based viewport clipping. Graphics program provide two dimensional views of three-dimensional objects through ports. A user obtains a non-rectangular shape (referred to as a clipping entity) to be utilized as a view or viewport of a model. Any arbitrary shape such as a circle, ellipse, polygon, or other non-rectangular shape may be utilized as a clipping entity. The user obtains a clipping entity by creating a new clipping entity or modifying an existing entity. Multiple options are available to the user to create and modify a clipping entity. A reactor mechanism detects changes in the clipping entity and notifies the current viewport of the modifications. In response thereto, the viewport adjusts its boundaries and any graphics outside of the clipping entity are clipped
ot displayed to the user. Thus, a non-rectangular viewport may be displayed by a graphics program and utilized by the user.

REFERENCES:
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patent: 5249264 (1993-09-01), Matsumoto
patent: 5268677 (1993-12-01), Frasier et al.
patent: 5329613 (1994-07-01), Brase et al.
patent: 5524200 (1996-06-01), Orton et al.

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