Question

尝试使用pygame启用射击弹丸。当我按下太空按钮后，它只发射1个子弹，fps从100下降到〜30，玩家角色无法移动并且对按钮按下没有反应。在弹丸停止动画后，fps返回到100，我可以按计划移动和射击最多3个弹丸，但是fps再次下降，直到最后一个弹丸到达边界时，我才能移动。

我之前加载的是项目符号图像，而不是绘制项目符号，并以为案件在其中。但是结果并没有改变。我还尝试重新排序blit()函数，但也没有任何变化。

class Game():
    # Some game stuff and functions
    def __init__(self):
        self.x_default = 800
        self.y_default = 600
        self.screen = pygame.display.set_mode((self.x_default, self.y_default))
        #self.background = pygame.image.load('IMGs/BCK2.bmp').convert()         
        self.title = 'Title'
        self.fps = 100

class Projectile():
    # This class is supposed to make projectiles
    def __init__(self, x, y, speed_x=5, direction=1, width=10, height=10):
#       x&y - starting positions of projectiles
#       speed_x & speed_y - starting moving speeds of projectiles in # oX & oY
#       a - speed increase over time (cancelled for now)
#       direction - stays for its' name
#       Directions: [2, 3, 1, 4, 5, 6, -1, 7] starting from 0:00 and  moving towards the right side of the clock

        self.x = x
        self.y = y

        self.speed_x = speed_x

        self.direction = direction

        self.width = width
        self.height = height
        self.img = pygame.Rect(self.x, self.y, self.width, self.height)

    def move_projectile(self, x, speed_x, direction):

#       Moves stuff
#       For now direction works only in right-left (1 for right, -1 for left)

        x += speed_x * direction
        return x

while 1:
    if pygame.event.poll().type == pygame.QUIT:
        sys.exit()

    for pr in projectiles:
        if (pr.x >= -pr.width) and (pr.x <= Game().x_default):
            pr.x = pr.move_projectile(x=pr.x, speed_x=pr.speed_x, direction=pr.direction)
        else:
            projectiles.remove(pr)

    keys = pygame.key.get_pressed()

# ------------ oX moving --------------

    if keys[pygame.K_LEFT]:
        P.x -= P.speed
        P.direction = -1

    if keys[pygame.K_RIGHT]:
        P.x += P.speed
        P.direction = 1

# ------------ Shooting ----------------

    if keys[pygame.K_SPACE]:
        if len(projectiles) < 3:
            if P.direction > 0:
                projectiles.append(Projectile(x=P.x + P.width, y=P.y + P.height//2, direction=1))
            else:
                projectiles.append(Projectile(x=P.x, y=P.y + P.height//2, direction=-1))

# ---------- The blitting process --------------

    G.screen.blit(G.background, (0, 0))
    G.screen.blit(Block1.img, (Block1.x, Block1.y))
    G.screen.blit(Block2.img, (Block2.x, Block2.y))
    for pr in projectiles:
        pygame.draw.rect(G.screen, (0, 0, 0), pr.img)
    G.screen.blit(P.img, (P.x, P.y))
    pygame.display.update()
    pygame.time.delay(1000//G.fps)

Answer 1

只要保持 SPACE ，

keys[pygame.K_SPACE]就是True。这意味着只要按住键，就会连续生成多个项目符号。

如果要创建单个项目符号，请按 SPACE ，然后使用KEYDOWN事件（请参见pygame.event）。
该事件仅在按键时每次发生一次。例如：

while 1:

    for event in pygame.event.get():

        if event.type == pygame.QUIT:
            sys.exit()

        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_SPACE:

                if len(projectiles) < 3:
                    if P.direction > 0:
                        projectiles.append(Projectile(x=P.x + P.width, y=P.y + P.height//2, direction=1))
                    else:
                        projectiles.append(Projectile(x=P.x, y=P.y + P.height//2, direction=-1))

    keys = pygame.key.get_pressed()

    # [...]

无法在Pygame中正确执行投射物

1 个答案: