Correlation of cursor position to shapes displayed on a video di

Details Correlation of cursor position to shapes displayed on a video di Correlation of cursor position to shapes displayed on a video di

1993-04-21

1995-08-15

Jankus, Almis R.

395133, 395135, 395121, 395122, G06T 1500

Patent

active

054427363

ABSTRACT:
A computer system (10) comprises a processor unit (14), a keyboard (16), a screen (12) and a mouse (18). A user uses the mouse to control the position of a cursor (20) on the screen, and also to indicate a selected cursor position. To correlate this position with shapes (40, 42) on the display, to determine which if any shapes have been selected, the computer first determines whether a pick rectangle around the selected cursor position overlaps a bounding rectangle (40, 42) around a shape. Those shapes for which an overlap is found are re-drawn into a bit map in memory, which is then examined to see if this drawing process has resulted in a change to the bit map. Any shapes which produce a change in the bit map must overlap the pick rectangle, and so are correlated with the cursor position.

REFERENCES:
patent: 4788538 (1988-11-01), Klein et al.
patent: 4847605 (1989-07-01), Callahan et al.
patent: 4982345 (1991-01-01), Callahan et al.
patent: 5027291 (1991-06-01), Callahan et al.
patent: 5101436 (1992-03-01), DeAguir et al.
patent: 5329613 (1994-07-01), Brase et al.

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