SpriteCollide每次碰撞仅运行一次

问题描述

我正在检查 missileGroup ，以查看导弹的任何实例是否与 enemyGroup 中的任何实例 enemy 发生冲突.在运行时，它会打印"Hit".对于第一个循环，但它忽略了第二个for循环.为什么会这样?

I'm checking missileGroup to see if any instances of missile collided with any instances enemy in enemyGroup. When run, it prints "Hit" for the first loop, but it ignores the second for loop. Why is that?

 #### Imagine this is in a game loop ####
        for missile in missileGroup:
            if pygame.sprite.spritecollide(missile, enemyGroup, False) :
                print("Hit")


        for enemy in enemyGroup:
            if pygame.sprite.spritecollide(enemy, missileGroup, False) == True:
                print("HI")

推荐答案

pygame.sprite.spritecollide() 不返回 True 或 False ，但返回包含所有内容的列表组中的 Sprites 与另一个 Sprite 相交.您必须评估列表是否不为空，而不是将结果与 True 进行比较:

pygame.sprite.spritecollide() doesn't return True or False, but it return a list containing all Sprites in a Group that intersect with another Sprite. You have to evaluate whether the list is not empty instead of comparing the result with True:

if pygame.sprite.spritecollide(enemy, missileGroup, False):

---

无论如何都使用 pygame.sprite.groupcollide() 来查找在两组之间碰撞的所有精灵.

---

Anyway use pygame.sprite.groupcollide() to find all sprites that collide between two groups.

if pygame.sprite.groupcollide(missileGroup, enemyGroup, False, False):
    print("Hit")

---

请参见 pygame.sprite.spritecollide() :

请参见 pygame.sprite.groupcollide()

因此， spritecollide()的参数必须是 pygame.sprite.Sprite 对象和 pygame.sprite.Group 对象. groupcollide()的参数必须是两个 pygame.sprite.Group 对象.
pygame.sprite.Sprite 对象而不是 Group 的列表不起作用.

Therefore the arguments to spritecollide() must be a pygame.sprite.Sprite object and a pygame.sprite.Group object. the arguments to groupcollide() must be two pygame.sprite.Group objects.
A list of pygame.sprite.Sprite objects instead of the Group does not work.

missileGroup = pygame.sprite.Group()
enemyGroup = pygame.sprite.Group()

进一步了解 kill()

Furthermore read about kill()

因此，如果您在第一个循环中调用 kill()，则第二个循环将不起作用，因为该精灵已从所有组中删除.

Hence if you call kill() in the 1st loop, the 2nd loop won't work, because the sprite is removed from all Groups.

您可以在 reset 方法中调用 kill(). missile.reset()分别 eachEnemy.reset()导致第二个循环失败.

You call kill() in the reset methods. missile.reset() respectively eachEnemy.reset() causes the 2nd loop to fail.

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