python 37 line 1

#widget1.kv

Widget1:

    canvas:

        Line:

            points: (0, self.height/2, self.width, self.height/2)

        Line:

            points: (self.width/2, 0, self.width/2, self.height)

        Color:

            rgba: 0, 0, 1, 1

        Line:

            rectangle: (self.width/4, self.height/4, self.width/2, self.height/2) #x, y, w, h

            width: 2

        Color:

            rgba: 1, 1, 0, 1

        Line:

            ellipse: (self.width/4, self.height/4, self.width/2, self.height/2)

            width: 2

        Color:

            rgba: 1, 0, 0, 1

        Line:

            circle: (self.width/2, self.height/2, self.height/4) if self.width > self.height else (self.width/2, self.height/2, self.width/4) #centerX, centerY, radius

            width: 2

------------------------

widget1.py

from kivy.app import App

from kivy.uix.widget import Widget

class Widget1(Widget):

    pass

class Widget1App(App):

    pass

Widget1App().run()

reference:

https://www.youtube.com/watch?v=l8Imtec4ReQ&t=529s