Question

好的，所以我正在为学校做这个项目。我应该做一个太空入侵者类型的游戏。我已经完成了让我的船移动并开枪的机会。现在这就是问题所在，当我尝试多次射击时，它会擦除之前发射的子弹，然后发射一个根本不是一个好网站的新子弹。我怎样才能让它实际射击多次？

while (running == 1):
    screen.fill(white)
    for event in pygame.event.get():
        if (event.type == pygame.QUIT):
            running = 0
        elif (event.type == pygame.KEYDOWN):
            if (event.key == pygame.K_d):
                dir = "R"
                move = True
            elif (event.key == pygame.K_a):
                dir = "L"
                move = True
            elif (event.key == pygame.K_s):
                dir = "D"
                move = True
            elif (event.key == pygame.K_w):
                dir = "U"
                move = True
            elif (event.key == pygame.K_ESCAPE): 
                sys.exit(0)
            elif (event.key == pygame.K_SPACE):
                shot=True
                xbul=xgun + 18
                ybul=ygun
            #if key[K_SPACE]:
                #shot = True
        if (event.type == pygame.KEYUP):
            move = False

    #OBJECT'S MOVEMENTS
    if ((dir == "R" and xgun<460) and (move == True)):
        xgun = xgun + 5
        pygame.event.wait
    elif ((dir == "L" and xgun>0) and (move == True)):
        xgun = xgun - 5
        pygame.event.wait
    elif ((dir == "D" and ygun<660) and (move == True)):
        ygun = ygun + 5
        pygame.event.wait
    elif ((dir == "U" and ygun>0) and (move == True)):
        ygun = ygun - 5

    screen.blit(gun, (xgun,ygun))

    #PROJECTILE MOTION
    #key = pygame.key.get_pressed()

    if shot == True:
        ybul = ybul - 10
        screen.blit(bullet, (xbul, ybul))

    if xbul>640:
        shot=False

    pygame.display.flip()
    time.sleep(0.012)

Answer 1

你只有一个子弹的变量 - xbul和ybul。如果你想要多个项目符号，那么你应该将每个项目符号列为一个列表。您可以附加到每个列表以添加新项目符号，弹出以删除旧项目符号，并在绘制时迭代列表。

Answer 2

您可以为子弹创建一个类，其中包含x和y坐标以及与项目符号相关的其他内容。然后按下每个按钮按钮，创建一个新实例并将其追加到列表中。这样你可以拥有你想要的子弹数量 （更改了新 move 功能的代码）

class Bullet:
    def __init__(self,x,y,vx,vy):# you can add other arguments like colour,radius
        self.x = x
        self.y = y
        self.vx = vx # velocity on x axis
        self.vy = vy # velocity on y axis
    def move(self):
        self.x += self.vx
        self.y += self.vy

要添加以使用list并更新项目符号位置的示例代码（move()在上面）：

if shot == True: # if there are bullets on screen (True if new bullet is fired).
    if new_bullet== True: # if a new bullet is fired
        bullet_list.append(Bullet(n_x,n_y,0,10)) # n_x and n_y are the co-ords
                                                 # for the new bullet.

    for bullet in bullet_list:
        bullet.move()

我怎样才能让我的船发射多次射击？

2 个答案: