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demo.py
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demo.py
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import pygame as pg
from tween import Tween, Easing, EasingMode
WIDTH = 600
HEIGHT = 600
TITLE = "Motion Demo"
FPS = 60
if __name__ == '__main__':
pg.init()
canvas = pg.display.set_mode((WIDTH, HEIGHT))
pg.display.set_caption(TITLE)
running = True
clock = pg.time.Clock()
base_canvas = pg.Surface((WIDTH, HEIGHT), pg.SRCALPHA)
font = pg.font.SysFont('arialblack', 14)
BOX_SIZE = 30
SPACING = 20
boxes = []
easings = (
Easing.LINEAR,
Easing.SINE,
Easing.QUAD,
Easing.CUBIC,
Easing.QUART,
Easing.QUINT,
Easing.EXPO,
Easing.CIRC,
Easing.BACK,
Easing.ELASTIC,
Easing.BOUNCE
)
ease_txt = (
'linear',
'sinusoidal',
'quadratic',
'cubic',
'quartic',
'quintic',
'exponential',
'circular',
'back',
'elastic',
'bounce'
)
mode = font.render('Mode: IN', True, pg.Color(76, 58, 81))
for i in range(11):
boxes.append({
'rect': pg.Rect(0, (BOX_SIZE + SPACING) * i, BOX_SIZE, BOX_SIZE),
'tween': Tween(0, WIDTH - BOX_SIZE,
duration=2000,
easing=easings[i],
easing_mode=EasingMode.IN,
boomerang=True,
loop=True,
reps=0),
'text': font.render(ease_txt[i], True, pg.Color(119, 67, 96))
})
# You can't use special functions in colors
alpha_tween = Tween(255, 0,
duration=2000,
easing=Easing.QUAD,
easing_mode=EasingMode.IN_OUT,
boomerang=True,
loop=True,
reps=0)
FPS = 60
while running:
for event in pg.event.get():
if event.type == pg.QUIT:
running = False
elif event.type == pg.KEYUP:
match event.key:
case pg.K_SPACE:
for box in boxes:
box['tween'].start()
alpha_tween.start()
case pg.K_p:
for box in boxes:
box['tween'].pause()
alpha_tween.pause()
case pg.K_r:
for box in boxes:
box['tween'].resume()
alpha_tween.resume()
case pg.K_1:
for box in boxes:
box['tween'].easing_mode = EasingMode.IN
mode = font.render('Mode: IN', True, pg.Color(119, 67, 96))
case pg.K_2:
for box in boxes:
box['tween'].easing_mode = EasingMode.OUT
mode = font.render('Mode: OUT', True, pg.Color(119, 67, 96))
case pg.K_3:
for box in boxes:
box['tween'].easing_mode = EasingMode.IN_OUT
mode = font.render('Mode: IN_OUT', True, pg.Color(119, 67, 96))
canvas.fill(pg.Color(255, 255, 255))
# Update
step = font.render(f'Step: {boxes[0]["tween"].step:.3f}', True, pg.Color(76, 58, 81))
for box in boxes:
box['tween'].update()
box['rect'].x = box['tween'].value
# Render
canvas.blit(box['text'], (WIDTH / 2 - box['text'].get_width() / 2, box['rect'].y))
pg.draw.rect(canvas, pg.Color(76, 58, 81), box['rect'])
canvas.blit(mode, (20, 540))
canvas.blit(step, (20, 560))
pg.display.flip()
clock.tick(FPS)
pg.quit()