Rounding alternate edges in Kivy

Question

I did saw other solutions where they use up and down images. Which I found very complex for making alternate rounded edges.

Like this one below:

Answer 1

I defined a smoothbutton which I used as Button in all my components:

<SmoothButton@Button>:
    background_color:(0,0,0,0)
    background_normal:''
    back_color: (0.565, 0.557, 0.698,0.8)
    border_radius:[0,35,0,35]
    font_name:'Comic'
    canvas.before:
        Color:
            rgba:self.back_color
        RoundedRectangle:
            size:self.size
            pos:self.pos
            radius:self.border_radius 

Note the only catch here is :

border_radius:[0,35,0,35]