I want to display points in a scatter plot with indices as if it were a matrix, origin top left inverting the Y axis:
0,0 1,0
0,1 1,1
instead of default where the origin is the lower left.
0,1 1,1
0,0 1,0
I tried:
plot = pg.ScatterPlotItem(...)
plot.getViewBox().invertY(True) # view box is NoneType
as suggested here Inverting the Y axis in PyQtGraph with no luck.
Referring to the official doc, when you have data displayed within axes, you end up (directly or indirectly) using a PlotItem object as a container, as shown in the figure.
Assuming you are plotting something like the following:
plot_widget = PlotWidget()
plot_item = plot_widget.plotItem
plot = pg.ScatterPlotItem(x=[0, 0, 1, 1], y=[0, 1, 0, 1], size=20.0)
plot_widget.addItem(plot) # Or equivalently, plot_item.addItem(plot)
You can simply do:
plot_item.invertY(True)
And here is the result:
