Ok I found the answer. I can use AxisItem.setTicks().
On Tuesday, June 23, 2020 at 10:44:23 AM UTC-7, Matt Huszagh wrote:
>
> I'm plotting a 2D histogram where the x-axis corresponds to a time axis.
> However, I'm having trouble displaying the x-axis values as the time data I
> want instead of the index of the 1D arrays. My 2D histogram is composed of
> 2000 arrays of length 513. I receive the arrays progressively at uncertain
> times (they are streamed from an external device over USB). I update the
> image each time a new array is received. Currently the x-axis displays
> values from 0 to 2000, corresponding to the array index. Instead, I'd like
> it to display the exact same image, but with time values I record when I
> receive each array. A simplified version of my code is like this
>
> app = QtGui.QApplication([])
> win = QtGui.QMainWindow()
> imv = pg.ImageView(view=pg.PlotItem())
> img_view = imv.getView()
> img_view.invertY(False)
> img_view.setLimits(yMin=0, yMax=data.shape[1])
> img_view.getAxis("left").setScale(0.5)
> win.setCentralWidget(imv)
> win.show()
>
>
>
> `data` is a 2D list of the data. Every time I get a new array, I insert it
> into `data` and call `setImage` and call `app.processEvents()`.
>
> imv.setImage(data)
> app.processEvents()
>
>
>
> I can create an array of the x values I want based on the times (via
> `clock_gettime(CLOCK_MONOTONIC)` when each array is received), but I don't
> know how to set the displayed x-axis values to these values. Is there a
> function to do this? I saw `setLabel`, but it doesn't appear that it does
> this.
>
> I also know that I can use `setScale`. If you notice, I use this above for
> the y-axis. However, I can't use this here. The primary reason is that once
> a full 2000 arrays have been plotted, I restart the plot and plot the next
> 2000, but I want the time values to continue to increment, not go back to
> 0. Additionally, it would be slightly misleading since all time values past
> the current array time would be an estimate, which may or may not be very
> accurate. If there's a way to set the axis display from an array, I'd also
> like to do this for the y-axis since it would give me more flexibility
> there too.
>
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