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python-3.xqtuser-interfacepyqt5pyqtgraph

Updating barplot in real time using pyqtgraph

I am trying to create a little widget using pyqtgraph that updates in real time. I made this work with no problem using a line plot. However, I would like to do this with a bar plot using the addPlot method in pg.GraphicsWindow.

Here's the basic setup I have so far:

import pyqtgraph as pg

self.win = pg.GraphicsWindow(title='Spectrum Analyzer')
self.spectrum = self.win.addPlot(
            title='SPECTRUM', row=1, col=1
        )

# Plot the init data -- I want this to be a bar plot
self.obj = self.spectrum.plot(pen='m', width=3)

# Update data content in plot -- stick in loop
self.obj.setData(data_x, data_y)

I like the rapid features of addPlot and would rather not use pg.plot().addItem(pg.BarGraphItem()) in a loop due to high latency.

Solution

  • Maybe something like

    # initialization
self.obj = pg.BarGraphItem()
self.spectrum.addItem(self.obj)

# update
self.obj.setOpts(...)

    ?