python - 碰撞Pygame后穿过墙壁

Question

大家好，我需要帮助解决 pygame 上的碰撞问题。我有一个边界图，可以通过使用蒙版重叠来设置像素完美碰撞。检测到碰撞没有任何问题，但是当涉及到阻止玩家穿过墙壁时，总是有一些方法可以穿过它。我已经做了几次尝试(真的很多)，包括当你一次按下三个按钮时甚至卡住播放器以避免它发出嘶嘶声，但无济于事。

现在，我检查用户按下哪个按钮来设置方向:

while True:
for event in pygame.event.get():
    if event.type == pygame.QUIT:
        pygame.quit()
        sys.exit()
    key = pygame.key.get_pressed()
    if key[pygame.K_w]:
        COLLISION_DIRECTION = "UP"
    if key[pygame.K_s]:
        COLLISION_DIRECTION = "DOWN"
    if key[pygame.K_d]:
        COLLISION_DIRECTION = "RIGHT"
    if key[pygame.K_a]:
        COLLISION_DIRECTION = "LEFT"

然后根据方向检查碰撞。在我最后一次孤注一掷的尝试中，我求助于将最后一个非碰撞位置保存在数组上，将世界(我正在移动世界，而不是玩家)平移到该位置并减去或增加移动速度:

if boundariesMap_mask.overlap(player.mask, (offset_x, offset_y)) is None:
        lastPos = [world.x, world.y]
    else:
        while COLLISION_DIRECTION == "UP":
            world.y = (lastPos[1]-DIST_WORLD)
            break
        while COLLISION_DIRECTION == "DOWN":
            world.y = (lastPos[1]+DIST_WORLD)
            break
        while COLLISION_DIRECTION == "LEFT":
            world.x = (lastPos[0]-DIST_WORLD)
            break
        while COLLISION_DIRECTION == "RIGHT":
            world.x = (lastPos[0]+DIST_WORLD)
            break

我最好的猜测是，我应该在返回安全位置时阻止所有额外的输入，以避免更改 COLLISION_DIRECTION。你们能帮帮我吗？

world.x和world.y是世界的可变坐标

编辑:我忘了添加世界构造函数类

class World(pygame.sprite.Sprite):
def __init__(self):
    self.sprite = pygame.image.load('bin\\assets\\test.png')
    self.x = 220
    self.y = 45

def draw(self, surface):
    surface.blit(self.sprite, (self.x, self.y))

def handle_keys(self):

    key = pygame.key.get_pressed()
    if pygame.joystick.get_count():
        joystick_x = round(my_joystick.get_axis(0))
        joystick_y = round(my_joystick.get_axis(1))

        if joystick_x < 0:
            self.x += DIST_WORLD
        if joystick_x > 0:
            self.x -= DIST_WORLD
        if joystick_y < 0:
            self.y += DIST_WORLD
        if joystick_y > 0:
            self.y -= DIST_WORLD

    if key[pygame.K_w]:
        self.y += DIST_WORLD
    if key[pygame.K_s]:
        self.y -= DIST_WORLD
    if key[pygame.K_a]:
        self.x += DIST_WORLD
    if key[pygame.K_d]:
        self.x -= DIST_WORLD

Answer 1

从问题和您在评论中的回复来看，似乎每当注册三个或更多按键时就会触发故障，导致 COLLISION_DIRECTION和 World.y和 World.x更新不当。

考虑这样一个事实，即如果玩家沿 X 轴或 Y 轴的某个方向移动，他们不能同时沿相反方向移动。还要考虑一个事实，即主游戏循环中的代码允许 COLLISION_DIRECTION 的值。如果玩家同时按下多个键，则被覆盖；例如，如果同时按下 W、A 和 S，最后的 COLLISION_DIRECTION将是 "LEFT" .

我假设您允许对角线运动，所以我们在这里要做的是制作 COLLISION_DETECTION同时对 x 轴和 y 轴有意义。然后，我们必须将按键检查的次数限制为恰好两次(一次用于 x 轴，一次用于 y 轴)，这样三键问题就不会发生。

在你的主游戏循环中:

## Instead of one COLLISION_DIRECTION, we now have two separate variables:
## COLLISION_DIRECTION_X and COLLISION_DIRECTION_Y

while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
        key = pygame.key.get_pressed()

        ## Using elif so we don't mess up COLLISION_DIRECTION_Y
        if key[pygame.K_w]:
            COLLISION_DIRECTION_Y = "UP"
        elif key[pygame.K_s]:
            COLLISION_DIRECTION_Y = "DOWN"

        ## Using elif so we don't mess up COLLISION_DIRECTION_X
        if key[pygame.K_d]:
            COLLISION_DIRECTION_X = "RIGHT"
        elif key[pygame.K_a]:
            COLLISION_DIRECTION_X = "LEFT"

相应地更新您的碰撞检测:

 if boundariesMap_mask.overlap(player.mask, (offset_x, offset_y)) is None:
    lastPos = [world.x, world.y]
 else:
    ## Redundant while-break replaced with simple if-statements;
    ## Using while is not exactly necessary because we carry out
    ## these statements each frame

    if COLLISION_DIRECTION_Y == "UP":
        world.y = (lastPos[1]-DIST_WORLD)
    elif COLLISION_DIRECTION_Y == "DOWN":
        world.y = (lastPos[1]+DIST_WORLD)

    if COLLISION_DIRECTION_X == "LEFT":
        world.x = (lastPos[0]-DIST_WORLD)
    elif COLLISION_DIRECTION_X == "RIGHT":
        world.x = (lastPos[0]+DIST_WORLD)

然后，在您的 handle_keys 中功能:

 def handle_keys(self):

    key = pygame.key.get_pressed()
    if pygame.joystick.get_count():
        joystick_x = round(my_joystick.get_axis(0))
        joystick_y = round(my_joystick.get_axis(1))

        ## Restrict joystick x-input checking, because we logically
        ## cannot be both greater and less than zero

        if joystick_x < 0:
            self.x += DIST_WORLD
        elif joystick_x > 0:
            self.x -= DIST_WORLD

        ## Restrict joystick y-input checking, because we logically
        ## cannot be both greater and less than zero

        if joystick_y < 0:
            self.y += DIST_WORLD
        elif joystick_y > 0:
            self.y -= DIST_WORLD

    ## Restrict keypress vertical axis checking for the same reason
    if key[pygame.K_w]:
        self.y += DIST_WORLD
    elif key[pygame.K_s]:
        self.y -= DIST_WORLD

    ## Restrict keypress horizontal axis checking for same reason
    if key[pygame.K_a]:
        self.x += DIST_WORLD
    elif key[pygame.K_d]:
        self.x -= DIST_WORLD

希望对您有所帮助!如果代码没有做到这一点，我深表歉意，但至少，我希望我在代码之前的评论能提供一些见解。