Somebody asked in StackOverflow how to do smooth movements of objects (widgets) in python game platforms. I didn't have the time to reply there because the question was closed because the question was posted in a way that promotes debate not answers. But here is an answer. I think. I hope. I just wanted to say that in Kivy is possible to do smooth movements, not complicated, very flexible and there is a tutorial about it: Pong Game Tutorial
This is a simplified code based of the tutorial where I just make the bool move slowly in diagonal direction from bottom left to top right. I hope it will help somebody.
from kivy.app import App from kivy.uix.widget import Widget from kivy.properties import NumericProperty, ReferenceListProperty,\ ObjectProperty from kivy.vector import Vector from kivy.clock import Clock from kivy.lang import Builder Builder.load_string(""" <PongBall>: size: 50, 50 canvas: Ellipse: pos: self.pos size: self.size <PongGame>: ball: pong_ball PongBall: id: pong_ball pos: 0,0 """) class PongBall(Widget): velocity_x = NumericProperty(1) velocity_y = NumericProperty(1) velocity = ReferenceListProperty(velocity_x, velocity_y) def move(self): self.pos = Vector(*self.velocity) + self.pos class PongGame(Widget): ball = ObjectProperty(None) def update(self, dt): self.ball.move() class PongApp(App): def build(self): game = PongGame() Clock.schedule_interval(game.update, 1.0 / 60.0) return game if __name__ == '__main__': PongApp().run()