python-streamz
Streamz hvplot resets zoom and pan on each update
I'm plotting a large amount of streaming data using streamz and I'm very happy with the performance.
Here is how I create the stream, data frame, and the line:
self.stream = streamz.Stream()
example = pd.DataFrame({'Time': [], 'Depth': []}, index=[])
df = streamz.dataframe.DataFrame(self.stream, example=example)
self.line = df.hvplot.line(width=800,
x='Time',
y='Depth',
).opts(
title='Depth',
xlabel='Time',
ylabel='Depth')
The data frame is periodically updated like this:
df = pd.DataFrame([(date, value)], columns=['Time', 'Depth'])
self.stream.emit(df)
This builds a nice line that changes as new data arrives. However, zooming and panning don't work as the historical data is apparently not present for the hvplot.line.
Ideally, I can provide the missing data. If this is possible, please point me to some documentation or example.
If I cannot use zooming and panning, what is the correct way to disable them?
See https://discourse.holoviz.org/t/streamz-hvplot-resets-zoom-and-pan-on-each-update/4609/1 for the first report of this I can find.
I hope you hear something from the hv people, I'm not sure there's much we can do about it on this side.
