twoscaleswidget.kv

<TwoScalesTestLayout>:
    orientation: 'vertical'
    on_touch_down: self.ids.wdgt1.show_data('data.json')
    TwoScalesWidget:
        id: wdgt1
 

<TwoScalesWidget>:
    Button:
        id: btn1
        text: root.val1 + root.unit1
        font_size: 40
        canvas:
            Color:
                rgba: 0,1,0.9,0.8
            Line:
                circle:(self.center_x, self.center_y, 100, -150, root.num1)
                width: 15
                cap: 'round'
    Button:
        id: btn2
        text: root.val2 + root.unit2
        font_size: 40
        canvas:
            Color:
                rgba: 0,1,0.9,0.8
            Line:
                circle:(self.center_x, self.center_y, 100, -150, root.num2)
                width: 15
                cap: 'round'