Waveform behavior of strange graphics update

I have a strange problem with a waveform graph in a VI in LabVIEW 8.5.  For some reason when our diagram must autoscale the y-axis, all of the graph will redraw.  This causes a noticeable delay and is visibly distracting. At first, we thought it was a problem with the style of point, as we see only this question in our application by using a style that uses individual points for each data point, rather than connecting the dots with lines.

To test, I made a sample VI to ensure that he was not a problem of performance with any of our other codes and slipped and fell the graph of our application in a new VI.  I made a simple pattern that simulates the data written on the chalkboard.  I was a little relieved when I saw the same problem because it made me think that it wasn't our code that was the issue.

Then, on a whim, I decided to replace it with a 'new' waveform graph.  After you set up a certain number of things, I tried to reproduce the behavior, and I can't!  I tried to make the two graphs as identical as possible through all the settings, but I can't understand why it is shown the repainting issue, while the other does not.

I have included the two screws, and I'd love to know if others see the problem, and if anyone has an idea as to what is the cause.  To see what I mean, turn the knobs Amplitude and prejudice to force the chart to repaint.  GraphUpdateTest.vi will NOT show a problem, while GraphUpdateTest2.vi will be.

Thanks in advance!

-Ron

Hi Ron,

I could see what you're talking about, and I created a demand for corrective measures for this issue. Thanks for the bug capture.

Tags: NI Software

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