Question

我正在为一个项目制作游戏，但是我几乎没有被教导甚至不能制作一个简单的游戏，因此即使这里有类似的问题，我也不确定如何进行更改以适合我的游戏。

我确实设法制造了子弹，但它只能向上射击，而我需要它可以在鼠标所在的任何地方射击。

我尝试按照此处的一些答案进行操作，但它会显示错误消息，如果我尝试编辑这些错误消息，则会弹出更多错误消息，我真的不知道为什么。

这是我到目前为止所拥有的：

Code is removed for now. Will re-upload in 1 to 2 months.

run = True

while run:

   [...]

        elif event.type == pygame.MOUSEBUTTONDOWN:
            bullet = Bullet()
            bullet.rect.x = player.rect.x
            bullet.rect.y = player.rect.y
            all_sprite_list.add(bullet)

这是我的整个代码（如果有帮助的话）：

Code is removed for now. Will re-upload in 1 to 2 months.

我非常痛苦地意识到该游戏存在严重缺陷，即使与该问题无关，我也将不胜感激。（例如，子弹与敌人的碰撞检测。玩家与敌人的碰撞检测）但是目前，这个问题是我最大的担忧。非常感谢您的帮助！

Answer 1

您可以在事件pygame.MOUSEBUTTONDOWN中获取鼠标位置。

if event.type == pygame.MOUSEBUTTONDOWN:
    aim_pos = event.pos

您可能还希望子弹遵循射击的方向。

player_position = player.rect.center

# Assume you have got where you're aiming by aim_pos.
bullet_vec = pygame.math.Vector2(aim_pos[0] - player_position[0],
                                 aim_pos[1] - player_position[1]).normalize() * 10 #move speed
bullet = Bullet()
bullet.rect.center = player.rect.center
bullet.vec = bullet_vec
all_sprite_list.add(bullet)

并按照指示移动。

class Bullet(pygame.sprite.Sprite):
    ....your codes

    def update(self):
        self.rect.move_ip(self.vec.x, self.vec.y)

Answer 2

def update(self):
    self.rect.y -= 3

这是控制您所询问的功能（球移动的位置）的代码部分，但是我想您知道这是因为您编写了它。

它将显示错误消息，如果我尝试编辑这些错误消息，则会弹出更多错误消息，我真的不知道为什么。

嗯，这就是为您编程。继续修复它们。

我强烈建议您安装皮棉机。在您的代码上运行pylint可以为我提供所有这些，这似乎是您要求我们提供的反馈：

$ pylint --errors-only your-game.py
************* Module game
your-game.py:8:0: E1101: Module 'pygame' has no 'init' member (no-member)
your-game.py:30:21: E1121: Too many positional arguments for lambda call (too-many-function-args)
your-game.py:45:21: E1121: Too many positional arguments for lambda call (too-many-function-args)
your-game.py:93:21: E1121: Too many positional arguments for lambda call (too-many-function-args)
your-game.py:130:21: E1121: Too many positional arguments for lambda call (too-many-function-args)
your-game.py:299:25: E1101: Module 'pygame' has no 'QUIT' member (no-member)
your-game.py:301:25: E1101: Module 'pygame' has no 'MOUSEBUTTONDOWN' member (no-member)
your-game.py:336:25: E1101: Module 'pygame' has no 'QUIT' member (no-member)
your-game.py:339:27: E1101: Module 'pygame' has no 'KEYDOWN' member (no-member)
your-game.py:340:28: E1101: Module 'pygame' has no 'K_LEFT' member (no-member)
your-game.py:342:30: E1101: Module 'pygame' has no 'K_RIGHT' member (no-member)
your-game.py:344:30: E1101: Module 'pygame' has no 'K_UP' member (no-member)
your-game.py:346:30: E1101: Module 'pygame' has no 'K_DOWN' member (no-member)
your-game.py:349:27: E1101: Module 'pygame' has no 'KEYUP' member (no-member)
your-game.py:350:28: E1101: Module 'pygame' has no 'K_LEFT' member (no-member)
your-game.py:352:30: E1101: Module 'pygame' has no 'K_RIGHT' member (no-member)
your-game.py:354:30: E1101: Module 'pygame' has no 'K_UP' member (no-member)
your-game.py:356:30: E1101: Module 'pygame' has no 'K_DOWN' member (no-member)
your-game.py:359:27: E1101: Module 'pygame' has no 'MOUSEBUTTONDOWN' member (no-member)
your-game.py:376:0: E1101: Module 'pygame' has no 'quit' member (no-member)

另外，让我们谈谈这一点：

wall = Wall(0, 0, 10, 800)                                                    
wall_list.add(wall)                                                           
all_sprite_list.add(wall)

用于数百行。您可以对计算机进行编程以为您生成所有这些位置。但是，即使您不想这样做，也不要这样重复自己。

walls = (
         (0, 0, 10, 800),
         (40, 40, 10, 75),
         (50, 40, 190, 10),
         # ...
        )
for wall_coords in walls:
    wall = Wall(*wall_coords)
    wall_list.add(wall)
    all_sprite_list.add(wall)

与144个功能完全相同的是43行-如果您控制大量代码，则易于阅读和编辑。

Answer 3

因此，看着它，当MOUSEBUTTONDOWN时，您将在播放器位置创建一个新的Bullet（）。然后，当您更新项目符号时。您可以将其y坐标向上移动3个单位。

我建议给每个bullet一个velocity和target属性。这样您就可以“发射并忘记”每颗子弹，而不必担心每次手动更新。

def __init__(self, velocity: float, target: tuple or list):
    # other stuff
    self.velocity = velocity
    self.target = target

def update(self):

    # get the angle towards the target
    x_delta = self.target[0] - self.rect.x
    y_delta = self.target[1] - self.rect.y
    rotation = -math.atan2(y_delta, x_delta)

    # move towards the target
    self.rect.x += math.cos(rotation) * self.velocity
    self.rect.y -= math.sin(rotation) * self.velocity

如何使子弹跟随鼠标

3 个答案: