Intensity chart not updated while hidden

[Ian2]

Hi,

I have an several intensity charts on a tab of a tab control, updated periodically. If I change tabs, and then return to the tab with the charts, there is a black section on each, corresponding to the time switched away from the tab. The data is there, because then switching very briefly to another tab and back restores the missing sections?

Any ideas?

Ian

[Evan]

Can you post a real simple example that shows this? You may want to also go to ni.com/support and send in the simple VI so that NI can take a look at it.

A workaround for this may be to programatically switch back and forth real quick.

[Ian2]

Here is a LV7 example that exhibits the problem. Its a 500 element intensity chart, initialised to all zeroes, with data then added every 100ms. RUn it, change to the 2nd tab for a few seconds, then change back.

I'll raise it as a support issue also.

Ian

[Ian2]

For anybody who is interested, ni have come up with a work around until the problem is fixed: make the intensity chart invisible when switching to other tabs, and visible again when switching back to the tab on which it is displayed.

Ian

[Joe_Gerhardstein]

The problem is still there in 8.2.

[Joe_Gerhardstein]

It looks like you can just do a quick hide/show as well and this will refresh the graph.

[Ben]

And those two properties can be combined into one since property nodes execute from top to bottom.

Ben

[Craig_D]

I've verified that this is still an issue in LabVIEW 8.5 as well.  This was reported to R&D (# 31LAJH7N) for further investigation.  For now, the suggested workarounds of making the intensity chart invisible when it isn't on the frontmost tab or refreshing the chart should work.

Regards,

Craig D
Applications Engineer
National Instruments