How to avoid built-up for "cursor move" events?

I have a rather complicated program where several graphs need to be interactively updated according to cursors using "cursor move" events. The problem is that the recalculation is relatively slow and the behavior is less than satisfactory. Since the cursor position needs to be "tweaked" until the result is as desired, I cannot recalculate only at the "Cursor Release" event.
Lock front panel=enabled makes cursor movements tedious because the cursor movements is very
jumpy and non-interactive. Not user friendly!
Lock front panel=disabled queues up way too many move events and once the cursor is released
the graph continues to jump and recalculate for ages.
The attached demo (LabVIEW 8.20) shows one solution attempt that actually works pretty well: Skip the recalculation unless the cursor position from the event terminal is equal to the cursor position of the graph property node. This basically races through all unecessary intermediary recalculations on stale positions. However, the code can get complicated very quickly if there are multiple cursors.
In my opinion, cursor move events should not get queued up! The event buffer should hold only exactly one entry:
the most recent cursor position for each cursor. Can anyone think of a scenario where the extra cursor position trail is useful? The positions are pretty random anyway, right?
Does anyone have other (better!) ideas how to work around this problem? I definitely want to keep it simple and not throw lots of code at it.
The attached demo contains more details. It demonstrates the problem if "selective updates" is checked. If unchecked, it implements the above mentioned workaround.
LabVIEW Champion . Do more with less code and in less time .
Solved!
Go to Solution.
Attachments:
CursorDelay.vi ‏29 KB

Thanks for the example.
The more I think about this, I strongly prefer my original method. It uses minimal code compare to the other solutions offered here. As a demo, I am attaching an implementation to a slide control.
Fo those without LabVIEW 8.20.
All slide events have "lock front panel" disabled.
TIme delay is 500ms, simulating some complex calculation.
As you can see, it works extremely well:
NO shift registers, extra loops, queues, tuning parameters (min times, etc.), etc.etc.
Just a deceptively simple "equal" followed by a case structure.
The demo shows a typical recording if I quicky move the slide up and down, then release it. You can see that the raw event structure takes more than 40 seconds to stabilize while my selective solution follows the slider position almost perfectly despite the 500ms stall in each update.
See for yourself! Can anyone think of a drawback of this method? Even if the slide terminal is not in the same loop, a comparison of a local variable with the newval should do the trick just fine.
Message Edited by altenbach on 09-28-2006 12:43 PM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
SLIDEDelay.vi ‏26 KB
SlideUpdate.png ‏21 KB

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