Animation von Position und Größe

import random
import pgzrun, pygame

WIDTH, HEIGHT = 500, 500

rechteck = Rect((WIDTH/2, HEIGHT/2), (20, 20))


def update():
    pass

def draw():
    screen.fill("white")
    screen.draw.filled_rect(rechteck, "red")
    
def on_mouse_down():
    mausposition = pygame.mouse.get_pos()
    animate(rechteck,
            center=mausposition,
            tween='bounce_end',
            duration=1)
    
def on_key_down():
    groesse = (random.randint(10, 100), random.randint(10, 100))
    animate(rechteck,
            size=groesse,
            tween='bounce_end',
            duration=1)
    

pgzrun.go( )