Re: EMC Control Panel

[Paul <Paul.Corner-at-tesco.net>]

Hi Bill

Adding to Ray's comments here - As each point is first plotted, a subroutine
looks to see if it is part of a straight line move. Only when a change of
direction is detected is the coordinate stored. This has two advantages, it
reduces the amount of memory required to run the backplotter, and replotting
the trace is much faster. Even with the reduced number of calculations required
for each plot, if motion wasn't paused, data would be lost.
Backplotting was never realy intended to be used on a 'real' machine, only for
simulations, so this pausing shouldn't be an issue.

Regards, Paul.


On Wed, 12 Sep 2001, Ray wrote:

> This pausing is a "feature" of the backplotter that Paul wrote.  This
> plotter uses lines in the canvas widget rather than points like my old one
> did.  It is really much more efficient, more so with the rotate and zoom
> features.  But these lines need to be computed all the time or the machine
> paused during the other work of rotation and zoom.