Force FloatLayout to be square?

Question

I have a floatlayout with some widgets inside:

    fl = FloatLayout(size=(600,600),
                     pos_hint=({'center_x': .5, 'center_y': .5})) 

    pos1 = ImgButton(source='zulgrey.png',
                     size_hint=(0.2,0.2),
                     pos_hint=({'center_x': 0, 'center_y': .43}))

    pos2 = ImgButton(source='zulgrey.png',
                     size_hint=(0.2,0.2),
                     pos_hint=({'center_x': 0.5, 'center_y': 0.93}))

    pos3 = ImgButton(source='zulgrey.png',
                     size_hint=(0.2,0.2),
                     pos_hint=({'center_x': 1, 'center_y': .43}))

    pos4 = ImgButton(source='zulgrey.png',
                     size_hint=(0.2,0.2),
                     pos_hint=({'center_x': 0.5, 'center_y': .43}))
    fl.add_widget(cove)
    fl.add_widget(pos1)
    fl.add_widget(pos2)
    fl.add_widget(pos3)
    fl.add_widget(pos4)

However when I resize the window the positions of the widgets move from where I intended them to be. Is there a way I can force the floatlayout to have a fixed aspect ratio on resize?

Answer 1

Solved it like this:

FloatLayout:
    size_hint: 1, None
    size: self.width, self.width

size_hint: 1 doesn't have to be one, I just wanted my square to fill the size of the FloatLayout.

Alternatively:

FloatLayout:
    size_hint: None, 1
    size: self.height, self.height