接球游戏（joshua改进版）

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

mouse_x, mouse_y = pg.mouse.get_pos()
pg.draw.circle(game_window, ball_color, (ball_x, ball_y), 20)
pg.draw.rect(game_window, rect_color, (mouse_x - 50, 490, 100, 10))

ball_x += move_x
ball_y += move_y

my_score = font.render(str(score), False, (255, 255, 0))
game_window.blit(my_score, (500, 30))

if ball_y <= 20 or ball_x >= 580 or ball_x <= 20:
    move_y = -move_y

if ball_x > mouse_x - 50 and ball_x < mouse_x + 50 and ball_y >= 470:
    move_y = -move_y
    score += points
    count += 1

    if count == 5:
        count = 0

    points += 1

    if move_x > 0:
        move_x += 1
    else:
        move_x -= 1

    if move_y > 0:
        move_y += 1
    else:
        move_y -= 1

if ball_y > 490 and (ball_x < mouse_x - 50 or ball_x > mouse_x + 50):
    ball_x = randint(20, 580)
    ball_y = randint(20, 480)
    move_x = 1
    move_y = 1
    score = 0

pg.display.update()
time.sleep(0.005)