Patent
1993-07-29
1995-08-01
Nguyen, Phu K.
G06F 1562
Patent
active
054386551
ABSTRACT:
A method and apparatus for scheduling waveform updates, and for implementing antialiasing techniques compatible with a standard graphics drawing package. Interrupts are requested at regular intervals to update a waveform based on data samples received from a data source. When there is a delay in servicing a requested interrupt, the waveform is updated with a relatively large number of data samples so that the monitoring system does not fall behind the data source. However, a limit is placed on the number of data samples used to update the waveform at the servicing of a single interrupt to ensure that an erase bar that updates the waveform maintains a substantially constant velocity. Additionally, when there is a delay in servicing an interrupt, the next interrupt is requested to occur more quickly. The waveform is broken up into a plurality of wave segments extending between adjacent pixel columns and each wave segment is updated using three calls to a line drawing primitive of the graphics package. Two one-pixel wide lines are drawn in an intermediate antialiasing color, and a one-pixel wide line is drawn in a foreground color.
REFERENCES:
patent: 5371842 (1994-12-01), Easton et al.
Bresenham, J. E. 1965 "Algorithm For Computed Control of Digital Plotter" IBM Systems Journal 4:25-30.
LeBlanc Jeffrey T.
Richichi Frank
Hewlett--Packard Company
Nguyen Phu K.
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