define a time interval for StripChart

[L-Roussel]

Hi,

I work on a stripchart widget and I want to display values over a time Interval, defined by two Timestamp, using a script.
Is it currently possible?

Maybe the time_range property value should be a TimeRelativeInterval instead of a String ?

[kasemir]

I want to ... use a script

See general script caveats in for example the https://controlssoftware.sns.ornl.gov/training/2022_USPAS/ display builder intro. In short, if you have to ask how to do a script, you'll likely have problems maintaining it as well, but here it is:

from org.csstudio.display.builder.representation.javafx.widgets import JFXBaseRepresentation
from java.time import Instant
from java.time.temporal import ChronoUnit

plot = JFXBaseRepresentation.getJFXNode(widget)
# You'll find that it's an RTTimePlot
print(plot.__class__.__name__)
# .. with a time range
print(plot.getXAxis().getValueRange())
start = Instant.now().minus(3, ChronoUnit.HOURS)
end = Instant.now().minus(1, ChronoUnit.HOURS)
plot.getXAxis().setValueRange(start, end)

[L-Roussel]

It's not exactly what I've wanted to say, i'm sorry.
That script will not work for me here, It will just use the time_range value.
I think it's because in the same script and some others, I need to change other properties in the stripchart that trigger the function updateModel() in the StripchartRepresentation,
and these two lines are called :

final TemporalAmount rel_start = TimeParser.parseTemporalAmount(model_widget.propTimeRange().getValue());
model.setTimerange(TimeRelativeInterval.startsAt(rel_start));

erasing the old time range value.
That's why I'm talking about modifying the time_range property type, but maybe it'll cause problem as well.

[kasemir]

Well, then you'll have to update the handling of the "time_range" property.
For example, create a new "start" and "end" property that's parsed like the start and end of the data browser.
Remove the "time_range" property, increment the version number of the stripchart widget and have it translate the "time_range" property from older version files into the new "start" and "end" properties.

[kasemir]

Looks like you fixed this with #2338

Thanks!