Live plotting

A live plot item that subscribes to data streams and keeps updating, together with its widget container.

Overview

quatm/GUI/entries/updating_plot.py provides live plotting: UpdatingPlot is a PlotItem subclass that subscribes to a data stream, periodically pulls new data and refreshes the curve; LivePlot is a widget container that embeds one UpdatingPlot, which makes it easy to dock into other windows as a panel.

Components

Component	Description
`UpdatingPlot`	Live plot item: subscribes to a data stream and keeps the curve updated
`LivePlot`	Widget container: embeds one `UpdatingPlot` and may carry an image stream name

Key methods (UpdatingPlot)

Method	Description
`setnewData`	Periodically pulls new data; a one-dimensional array gets an x axis automatically, then the curve is updated according to the rotation flag
`updateConfiguration`	Cancels the old subscriptions, then resubscribes and rebuilds the curves from the stream list configured in the properties
`subscribe_window`	Opens the subscription editor to select data streams and reapplies the subscription configuration on close
`configureWindow`	Opens the property editor dialog to adjust settings and reapply the display configuration

Usage

from quatm.GUI.entries.updating_plot import UpdatingPlot, LivePlot

plot = UpdatingPlot(name="PMT signal")        # use directly as a plot item
host = LivePlot(name="PMT signal", parent=parent)  # or embed as a container in the UI

Subscriptions are made in the context menu of the plot item; LivePlot is also used as the container for the row/column profile plots in the image viewer.