如题，声明：只为我个人做记录，不供参考，欢迎批评指正。

目的：实现类似重力作用的效果。

想法：按空格使小球有一个向上的速度。（只按一次空格）最终效果应为：先减速向上运动，后加速向下运动。

造成卡顿的代码如下：

import pygame
import sys
from pygame.locals import *


pygame.init()
size = width, height = (1200, 600)  
screen = pygame.display.set_mode(size)  
screen.fill((255, 251, 240))


bird = pygame.image.load('./images/1.png').convert_alpha()
# 一个球，背景透明的图片
bird_rect = bird.get_rect()
bird_w, bird_h=bird_rect.width,bird_rect.height

bird_rect.x= 80
bird_rect.y = 300


move_y = 1
y_bool = True


while True:  
    if move_y < 1:
        move_y += 0.002

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()

    keys_pressed = pygame.key.get_pressed()

    if keys_pressed[K_SPACE] and y_bool:
        move_y = -0.7
        y_bool = False

    elif not keys_pressed[K_SPACE]:
        y_bool = True

    if bird_rect.top > height - bird_h:  # 到底端
        bird_rect.top = height - bird_h
        
    elif bird_rect.top < 0:  # 到顶端
        bird_rect.top = 0
        move_y = 0

    bird_rect.top += move_y

    screen.fill((255, 251, 240))

    screen.blit(bird, (bird_rect.left, bird_rect.top))
    pygame.display.update()

效果如图所示：

卡顿；运行不流畅；并没有预想中的加速向下；向上运动时减速到0时会停顿长时间

而不用rect记录位置等的代码如下：

import pygame
import sys
from pygame.locals import *
import cv2


def get_img_width_hight(img_name1):
    img1 = cv2.imread(img_name1)
    size1 = img1.shape
    return size1[1], size1[0]

pygame.init()
size = width, height = (1200, 600)
screen = pygame.display.set_mode(size)
screen.fill((255, 251, 240))
bird_w, bird_h = get_img_width_hight('./images/1.png')

bird = pygame.image.load('./images/1.png').convert_alpha()

bird_x= 80
bird_y = 300


move_y = 1
y_bool = True


while True:
    if move_y < 1:
        move_y += 0.002

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()

    keys_pressed = pygame.key.get_pressed()

    if keys_pressed[K_SPACE] and y_bool:
        move_y = -0.7
        y_bool = False

    elif not keys_pressed[K_SPACE]:
        y_bool = True

    if bird_y > height - bird_h:  # 到底端
        bird_y = height - bird_h

    elif bird_y < 0:  # 到顶端
        bird_y = 0
        move_y = 0

    bird_y += move_y

    screen.fill((255, 251, 240))

    screen.blit(bird, (bird_x, bird_y))
    pygame.display.update()

运行效果如下：

流畅，实现预想中的重力作用

不知为何用rect记录就会卡顿

（当然可能是我的电脑问题）