I do not get how to embed PyQtGraph in my MainWindow without generating a new window like it is done by using
pg.plot(...)
What is the easiest way for doing that ?
Pyqtgraph provides a long list of widgets which can be embedded. The documentation for pg.plot() states that this function creates and displays a PlotWidget, so that's probably the one you want.
Example:
my_plot = pg.PlotWidget()
my_layout.addWidget(my_plot)
my_plot.plot(x, y)