无法正确重新定位存储在列表中的图像

Question

我正在制作一款基于气球的游戏，而一把枪就是用来射气球的。 7 个气球图像存储在一个名为 colors 的列表中，另一个名为 balloon_list 的列表包含用于放置气球的所有随机生成的 x 值。当你击中气球时应该发生的是它应该消失然后再次随机化气球的 x 位置。我的问题是，当我击中某个气球时，它并没有随机化 x 位置并将其 blit 到屏幕，而是不断地这样做，它显示气球同时在不同的地方弹出。我尝试的是打乱所有 x 值的列表 (balloon_list)。这是我的代码：

import random as r
import sys


pg.init()


radius = 30
diameter = 2 * radius
num_balloons = 7

iterator = -1




def create_balloons():
    global balloon_list
    global colors

    for i in range(num_balloons):
        while True:
            candidate = r.randint(0, 500)
            if all(abs(candidate-x) >= diameter for x in balloon_list):
                break
        balloon_list.append(candidate)

def draw_balloons(y):
    for i in range(num_balloons):
        screen.blit(colors[i], (balloon_list[i] , y-50))


def check_collisions(x, y):
    global hit_var
    global hit
    global score
    global scoretext
    
    for i in range(num_balloons):
        gun_rect = gun.get_rect(topleft = (x,y))
        gun_mask = pg.mask.from_surface(gun)

        balloon_rect = colors[i].get_rect(topleft = (balloon_list[i], y-100))
        balloon_mask = pg.mask.from_surface(colors[i])

        offset = (balloon_rect.x - gun_rect.x), (balloon_rect.y - gun_rect.y)
        if gun_mask.overlap(balloon_mask, offset):
            hit = True
            hit_var = i
            print(f'hit balloon: {i}')
            colors[i].fill((0,0,0))
            screen.fill((0,0,0))

            


            
        


        
# Vars #
x = 0
y = 250
velocity = 5
score = 0
hit = False
testvar1 = True
clock = pg.time.Clock()


screen = pg.display.set_mode((688 ,387)) # Size of the screen #
screen.fill('#ffffff')
caption = pg.display.set_caption("Remember") # Title of the window #

balloon_list = []
b1 = pg.image.load('balloons/1.png').convert_alpha()
b1 = pg.transform.scale(b1, (63,131))
b2 = pg.image.load('balloons/2.png').convert_alpha()
b2 = pg.transform.scale(b2, (63,131))
b3 = pg.image.load('balloons/3.png').convert_alpha()
b3 = pg.transform.scale(b3, (63,131))
b4 = pg.image.load('balloons/4.png').convert_alpha()
b4 = pg.transform.scale(b4, (63,131))
b5 = pg.image.load('balloons/5.png').convert_alpha()
b5 = pg.transform.scale(b5, (63,131))
b6 = pg.image.load('balloons/6.png').convert_alpha()
b6 = pg.transform.scale( b6, (63,131))
b7 = pg.image.load('balloons/7.png').convert_alpha()
b7 = pg.transform.scale(b7, (63,131))
colors = [b1, b2, b3, b4, b5, b6, b7]




gun = pg.image.load('game-gun.png').convert_alpha()
gun = pg.transform.scale(gun, (150,150))

create_balloons()



pg.display.flip() # Updating #

running = True # Game loop bool #

while running: # Game loop #
    clock.tick(60)
    
    if hit == True:
        r.shuffle(balloon_list)
        
        
        
    for event in pg.event.get():
        if event.type == pg.QUIT:
            pg.quit()
            sys.exit()
        if event.type == pg.KEYDOWN:
            if event.key == pg.K_ESCAPE:
                pg.quit()
                sys.exit()

    draw_balloons(y)
    keys = pg.key.get_pressed()

    x += keys[pg.K_RIGHT] - keys[pg.K_LEFT] * velocity
    x -= keys[pg.K_LEFT] - keys[pg.K_RIGHT] * velocity
   
    if keys[pg.K_SPACE]:
        check_collisions(x, y)
        print(balloon_list)
        

        



        
        
     
    screen.blit(gun, (x, y))
    pg.display.update()

枪和气球图片可以在这里下载：Images posted on repl

我认为这个问题与在 while 循环中 blitting 图像有关，因此它会永远不断地改变 balloon_list 中的 x 位置，但我不确定如何解决它。

P.S：我的真实代码中有一个if hit = False的子句，所以在shuffle代码后添加hit = False是行不通的。

感谢任何帮助，谢谢

Answer 1

使用 KEYDOW 事件而不是 pygame.key.get_pressed() 来检测何时按下 SPACE。 pygame.key.get_pressed() 导致在 SPACE 按下一次时发射多发子弹

pygame.key.get_pressed() returns a list with the state of each key. If a key is held down, the state for the key is True, otherwise False. Use pygame.key.get_pressed() 评估按钮的当前状态并获得连续移动。
键盘事件（参见 pygame.event 模块）仅在键状态改变时发生一次。 KEYDOWN 事件在每次按下一个键时发生一次。 KEYUP 每松开一个键就会出现一次。将键盘事件用于单个操作。

调用 shuffle 后，必须设置变量 hit False。没有办法解决它：

while running: # Game loop #
    clock.tick(60)    
    for event in pg.event.get():
        if event.type == pg.QUIT:
            running = False
        if event.type == pg.KEYDOWN:
            if event.key == pg.K_ESCAPE:
                running = False
        
            if event.key == pg.K_SPACE:
                check_collisions(x, y)
                print(balloon_list)

    keys = pg.key.get_pressed()
    x += keys[pg.K_RIGHT] - keys[pg.K_LEFT] * velocity
    x -= keys[pg.K_LEFT] - keys[pg.K_RIGHT] * velocity
   
    draw_balloons(y)

    if hit == True:
        r.shuffle(balloon_list)
        hit = False

pg.quit()
sys.exit()

如果点击还导致出现特定背景，则您需要对其进行更改。设置不同的变量来改变背景。

无法正确重新定位存储在列表中的图像

Cannot properly reposition images stored in a list

python

random

pygame

list