获取碰撞的侧面:碰撞检测

Question

我正在尝试制作一款平台游戏，其中没有斜坡。我正在尝试降低碰撞检测，但我在pygame中找不到一种方法来获取哪一侧与另一侧精灵相撞。谁能给我一个很好的方法来做到这一点，它不是太笨重，但在我的情况下也能很好地工作？

这是我的玩家类：

class Player(pg.sprite.Sprite):
    def __init__(self,game):
        pg.sprite.Sprite.__init__(self)
        self.image = pg.Surface((30, 40))
        self.game = game
        self.image.fill(YELLOW)
        self.rect = self.image.get_rect()
        self.rect.center = (WIDTH / 2, HEIGHT / 2)
        self.pos = vec(WIDTH / 2, HEIGHT / 2)
        self.vel = vec(0, 0)
        self.acc = vec(0, 0)
    def jump(self):
        self.rect.y += 1
        hits = pg.sprite.spritecollide(self, self.game.platforms, False)
        self.rect.y -= 1
        if hits:
            self.vel.y = -15
    def update(self):
        self.acc = vec(0, PLAYER_GRAV)
        keys = pg.key.get_pressed()
        if keys[pg.K_LEFT]:
            self.acc.x = -PLAYER_ACC
        if keys[pg.K_RIGHT]:
            self.acc.x = PLAYER_ACC
        self.acc.x += self.vel.x * PLAYER_FRICTION
        self.vel += self.acc
        self.pos += self.vel + 0.5 * self.acc

        self.rect.midbottom = self.pos

这是我的平台类：

class Platform(pg.sprite.Sprite):
    def __init__(self, x, y ,w, h):
        pg.sprite.Sprite.__init__(self)
        self.image = pg.Surface((w,h))
        self.image.fill(GREEN)
        self.rect = self.image.get_rect()
        self.rect.x = x
        self.rect.y = y
        self.centerx = x+(w/2)
        self.centery = y+(h/2)

这是我目前进行碰撞的方式(仅适用于平台顶部(

hits = pg.sprite.spritecollide(self.player,self.platforms, False)
if hits:
    self.player.pos.y = hits[0].rect.top+1
    self.player.vel.y = 0

编辑：

我

已将其添加到我的播放器类中，每次播放器更新时我都会运行它，并且可以正常工作......几乎。

def wall_collisions(self):
    self.rect.centerx = self.pos.x
    for wall in pg.sprite.spritecollide(self, self.walls, False):
        if self.vel.x > 0:
            self.rect.right = wall.rect.left
            self.vel.x = 0
        elif self.vel.x < 0:
            self.rect.left = wall.rect.right
            self.vel.x = 0
        self.pos.x = self.rect.centerx
    self.rect.centery = self.pos.y
    for wall in pg.sprite.spritecollide(self, self.walls, False):
        if self.vel.y > 0:
            self.rect.bottom = wall.rect.top
            self.vel.y = 0
        elif self.vel.y < 0:
            self.rect.top = wall.rect.bottom
            self.vel.y = 0
        self.pos.y = self.rect.centery

平台游戏顶部的碰撞有效，

侧面的碰撞几乎总是有效，除非我按玩家然后跳跃。如果我试图击中平台底部的玩家，它会将我射到平台的两侧。有什么帮助吗？

Answer 1

我已经找到了一个可行的解决方案。以下代码运行良好。

def wall_collisions(self):
    self.rect.centerx = self.pos.x
    for wall in pg.sprite.spritecollide(self, self.walls, False):
        if self.vel.x > 0:
            self.rect.right = wall.rect.left
            self.vel.x = 0
        elif self.vel.x < 0:
            self.rect.left = wall.rect.right
            self.vel.x = 0
        self.pos.x = self.rect.centerx
    self.rect.centery = self.pos.y
    for wall in pg.sprite.spritecollide(self, self.walls, False):
        if self.vel.y > 0:
            self.rect.bottom = wall.rect.top
            self.vel.y = 0
        elif self.vel.y < 0:
            self.rect.top = wall.rect.bottom
            self.vel.y = 0
        self.pos.y = self.rect.centery