Helper functions for easing and tweening
pip install tweener
Tween(begin, end, duration, easing, easing_mode, boomerang, loop, reps)| Parameter | Type | Description |
|---|---|---|
begin |
float |
The beginning value of a property (default: 0.0) |
end |
float |
The end value of a property (default: 1.0) |
duration |
int |
The length of time that an animation takes to complete (default: 600 ms) |
easing |
Easing |
The type of easing to apply. (default: Easing.LINEAR) |
easing_mode |
EasingMode |
The mode of easing IN, OUT, IN_OUT, (default: IN) |
boomerang |
bool |
Returns the animation back to its starting point and vice versa. (default: False) |
loop |
bool |
Loops the animation. When used with boomerang, it does the back and forth animation. (default: False) |
reps |
int |
Number of times the animation will be repeated. Zero means infinite. (default: 0) |
Tween().start()Tween().update()Tween().pause()Tween().resume()LINEAR
SINE
QUAD
CUBIC
QUART
QUINT
EXPO
CIRC
BACK
ELASTIC
BOUNCE
IN
OUT
IN_OUT
I used Python version 3.10.5 and pygame 2.1.2
import pygame
from tweener import *
WIDTH = 600
HEIGHT = 600
TITLE = "Motion Demo"
FPS = 60
pygame.init()
canvas = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption(TITLE)
running = True
clock = pygame.time.Clock()
rect = pg.Rect(0, 100, 100, 100)
anim_y = Tween(begin=0,
end=WIDTH-100,
duration=1000,
easing=Easing.BOUNCE,
easing_mode=EasingMode.OUT,
boomerang=True,
loop=True)
while running:
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
elif event.type == pygame.KEYUP:
match event.key:
case pygame.K_SPACE:
anim_y.start()
case pygame.K_p:
anim_y.pause()
case pygame.K_r:
anim_y.resume()
canvas.fill(pygame.Color(255, 255, 255))
# Update
anim_y.update()
rect.x = anim_y.value
# Render
pygame.draw.rect(canvas, (255, 0, 0), rect)
pygame.display.flip()
clock.tick(FPS)
pygame.quit()demo.mp4
Contributions are always welcome!