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

<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()```