Cursor move event dicrease frequency

Hello!
A long time ago I remember I saw a forum post or a community doc, where it was explained how to decrease a certain Event to be triggered too frequently.
I have a graph with a cursor, and when the user starts to move the cursor, I do some minor calculations and output some values into indicators. I would like to discard some of the "mouse move" events, so when the user pulls the cursor "too fast", I do not overload the CPU with processing. I know I could just use the "cursor release" event, but it is not that nice, the user does not get feedback about the values between the two locations.
So I cannot really remember what was the trick to discard the too frequent triggering, it involved some time stamp comparison I think...
Could someone help me out, how to properly solve this task?
thanks!
Solved!
Go to Solution.

In newer LabVIEW version you can limit the size of the event queue. Try this first. (See this completed idea).
In earlier version I would compare the current cursor position with the position obtained from a property node and execute an empty case structure unless they are equal. The old discussion is here. (Also make sure to disable "lock front panel until event completes").
The cursor idea in in this reply, see the right side of the following image.
LabVIEW Champion . Do more with less code and in less time .

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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:
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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

Programmatically fire graph cursor move event

Is it possible to programmatically fire the Graph Cursor Move Event ? Assigning a value to the Cursor Index or Cursor Position property node does not seem to do it.
Solved!
Go to Solution.

The graph cursor move event contains processing code for data on the graph along with front panel display of those results. Data is put onto the graph during data acquisition which occurs in another event. When that data acquisition event finishes I need to cause the processing code to execute once to update the front panel display so its results are shown for the new acquired data.
I could put the processing code into a different event that fires on say a button value change. Then the graph cursor move event would fire that button event change by setting its value change property. The data acquisition event could also fire that button event.

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I have a graph where the user moves the cursor and then I pop up an easy to read dialog with the test number and test description in it. I tried it with a regular dialog with reentrancy but it locks things up. Is there a better way to do this?

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Attachments:
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Sub2.vi ‏17 KB

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Since LabVIEW 8+ introduced cursor events (grab, move, release), is there a conflict that would occur between a mouse move event and cursor move event since a cursor move involves a mouse move? Or, since the cursor move requires the left mouse button to be down, does that allow LabVIEW to differentiate which event is occurring? I have some code I am writing to draw a box on an intensity graph (using the new plot.images property for graphs) so as to extract a region of interest. At first, I want a cursor to follow the mouse as it moves over the graph. Then, I want to draw the box region when I grab the cursor (with left mouse key down) and drag it. Differentiation of these two event types will allow me to unambiguously accomplish this task.
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Moving a cursor will interleave mouse move and cursor move events.
However, you can easily keep state of mouse up/down to distinguish what to do in this particular case. See attached draft (8.20).
LabVIEW Champion . Do more with less code and in less time .
Attachments:
eventqueue1.vi ‏29 KB

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Just today I had the same problem -> my solution:
set event timeOut to some value(I have it at 1ms) then
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Sorry but look at this SAP documentation <a href="http://help.sap.com/saphelp_nw2004s/helpdata/en/54/0608162d0711d295520000e8353423/frameset.htm">User Actions on Screens</a>
Extract :
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Cursor move event dicrease frequency

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