Can reproduce with latest version of pyqtgraph. Some bug with detection of
nan/infs, but only on subsequent updates (note the first draw renders
correctly). Adding an explicit connect="finite" to the setData calls works
as expected.
On Saturday, 1 October 2022 at 12:57:30 am UTC+9:30 AB wrote:
> OK, I've hacked down the application to a small-ish file (attached).
> There are two graphs, side-by-side. They both have some data with an
> invalid section and it is consistently being drawn across until I change
> the zoom level - it then reappears on the next graph update.
>
> On Friday, 30 September 2022 at 16:11:44 UTC+1 AB wrote:
>
>> np.nan also misbehaves.
>>
>> On Friday, 30 September 2022 at 16:09:38 UTC+1 AB wrote:
>>
>>> Since posting earlier, I've tried float("nan"), float("inf") and np.inf
>>> and they all behave exactly the same. I'll see if I can cut my
>>> application's code down to something I can share.
>>>
>>> I did manage to "stop" the graph while the glitch was displayed (and by
>>> "stop" I mean that the application was running but I stopped making further
>>> calls to setData). Before zooming the graph I used the context-menu to
>>> export data to CSV and I could clearly see that there was a period exported
>>> as "inf" where the line was being displayed.
>>>
>>> On Friday, 30 September 2022 at 16:02:50 UTC+1 [email protected]
>>> wrote:
>>>
>>>> Hmm, that certainly should not be happening, not sure quite why things
>>>> would be going like that. If you can, I would try slowing down the update
>>>> rate of the plot, to easily catch one of those instances and post some
>>>> code
>>>> here if you can for us to try and replicate.
>>>>
>>>> Another suggestion would be to set the invalid points to numpy.nan
>>>> instead of float("inf") and see if that gets better behavior; I think that
>>>> was the value we were originally looking for.
>>>>
>>>> On Fri, Sep 30, 2022 at 7:27 AM AB <[email protected]> wrote:
>>>>
>>>>> I am trying to display some data in a line graph - there are 1024
>>>>> points, updating ~40 times/second. Some of the points are invalid (set
>>>>> to
>>>>> float("inf") ) and are supposed to cause a break in the line if I
>>>>> understand the default behaviour of the "connect" parameter correctly.
>>>>> However, I am periodically seeing that there is a straight line joining
>>>>> the
>>>>> valid points either side of the invalid period.
>>>>>
>>>>> I can stop updating the graph and catch this happening - as soon as I
>>>>> use the mouse zoom functionality to change the scale of the graph in this
>>>>> state the erroneous line vanishes, and the graph is drawn with breaks in
>>>>> the line as I expect that it should.
>>>>>
>>>>> Can anyone suggest why the erroneous lines are appearing, and how I
>>>>> can ensure they don't appear?
>>>>>
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>>>>>
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>>>>> .
>>>>>
>>>>
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