I have a helper class in my gui.py file:

from matplotlib.backends.backend_qtagg import FigureCanvasQTAgg as FigureCanvas

class MplCanvas(FigureCanvas):
    def __init__(self, parent=None, width=5, height=4, dpi=100):
        self.fig = Figure(figsize=(width, height), dpi=dpi)
        self.axes = self.fig.add_subplot(111)
        super(MplCanvas, self).__init__(self.fig)

I also have a main window class in gui.py: class MainWidget(QWidget) In which there are three objects of the above MplCanvas class: self.image1, self.image2, self.image3

These three objects draw pictures through the same function: visual.draw_image, which is located in the visual.py file. In this function, in addition to the main axes ax, another axes dax = ax.twinx() is created.

The images are updated by the update_images function, called when the button is clicked.

Every time I needed to update the picture, I tried three ways to clear my axes / shape / MplCanvas() object / etc:

1.

self.image1.axes.clear()
self.image2.axes.clear()
self.image3.axes.clear()

for ax in self.image1.axes.get_shared_x_axes().get_siblings(self.image1.axes):
    ax.clear()
for ax in self.image2.axes.get_shared_x_axes().get_siblings(self.image2.axes):
    ax.clear()
for as in self.image3.axes.get_shared_x_axes().get_siblings(self.image3.axes):
    ax.clear()

self.image1.fig.canvas.draw()
self.image2.fig.canvas.draw()
self.image3.fig.canvas.draw()

So, in the first case, the right dax axes is displayed twice from two pictures, in the second case, the right dax axes from the first picture is cleared, but at the same time a new one is drawn – completely new without any limits, in the third case everything is completely deleted and just white background.

I have this ;(
click for check screen

How can I solve this problem? Help, good people)