我如何检测pygame中的碰撞？

Question

我使用下面的类制作了一个子弹列表和一个精灵列表。如何检测子弹是否与 sprite 发生碰撞，然后删除该 sprite 和子弹？

#Define the sprite class
class Sprite:

    def __init__(self,x,y, name):
        self.x=x

        self.y=y

        self.image = pygame.image.load(name)

        self.rect = self.image.get_rect()

    def render(self):
        window.blit(self.image, (self.x,self.y))


# Define the bullet class to create bullets          
class Bullet:

    def __init__(self,x,y):
        self.x = x + 23
        self.y = y
        self.bullet = pygame.image.load("user_bullet.BMP")
        self.rect = self.bullet.get_rect()

    def render(self):
        window.blit(self.bullet, (self.x, self.y))

Answer 1

在 PyGame 中，碰撞检测是使用 pygame.Rect 对象完成的。 Rect 对象提供了多种检测对象之间碰撞的方法。即使是矩形和圆形物体（例如桨和球）之间的碰撞也可以通过两个矩形物体（桨和球的边界矩形）之间的碰撞来检测。

一些例子：

• pygame.Rect.collidepoint:

  测试一个点是否在矩形内

  repl.it/@Rabbid76/PyGame-collidepoint

  import pygame
  
  pygame.init()
  window = pygame.display.set_mode((250, 250))
  rect = pygame.Rect(*window.get_rect().center, 0, 0).inflate(100, 100)
  
  run = True
  while run:
      for event in pygame.event.get():
          if event.type == pygame.QUIT:
              run = False
  
      point = pygame.mouse.get_pos()
      collide = rect.collidepoint(point)
      color = (255, 0, 0) if collide else (255, 255, 255)
  
      window.fill(0)
      pygame.draw.rect(window, color, rect)
      pygame.display.flip()
  
  pygame.quit()
  exit()
  

  pygame.Rect.colliderect

  测试两个矩形是否重叠

  另见How to detect collisions between two rectangular objects or images in pygame

  repl.it/@Rabbid76/PyGame-colliderect

  import pygame
  
  pygame.init()
  window = pygame.display.set_mode((250, 250))
  rect1 = pygame.Rect(*window.get_rect().center, 0, 0).inflate(75, 75)
  rect2 = pygame.Rect(0, 0, 75, 75)
  
  run = True
  while run:
      for event in pygame.event.get():
          if event.type == pygame.QUIT:
              run = False
  
      rect2.center = pygame.mouse.get_pos()
      collide = rect1.colliderect(rect2)
      color = (255, 0, 0) if collide else (255, 255, 255)
  
      window.fill(0)
      pygame.draw.rect(window, color, rect1)
      pygame.draw.rect(window, (0, 255, 0), rect2, 6, 1)
      pygame.display.flip()
  
  pygame.quit()
  exit()
  

此外，pygame.Rect.collidelist和pygame.Rect.collidelistall可用于矩形与矩形列表之间的碰撞测试。 pygame.Rect.collidedict和pygame.Rect.collidedictall可用于矩形和矩形字典之间的碰撞测试。

pygame.sprite.Sprite和pygame.sprite.Group对象的碰撞，可以被pygame.sprite.spritecollide()、pygame.sprite.groupcollide()或pygame.sprite.spritecollideany()检测到。使用这些方法时，可以通过collided参数指定碰撞检测算法：

collided 参数是一个回调函数，用于计算两个精灵是否发生碰撞。

可能的collided callables 是collide_rect、collide_rect_ratio、collide_circle、collide_circle_ratio、collide_mask

一些例子：

• pygame.sprite.spritecollide()

  repl.it/@Rabbid76/PyGame-spritecollide

  import pygame
  
  pygame.init()
  window = pygame.display.set_mode((250, 250))
  
  sprite1 = pygame.sprite.Sprite()
  sprite1.image = pygame.Surface((75, 75))
  sprite1.image.fill((255, 0, 0))
  sprite1.rect = pygame.Rect(*window.get_rect().center, 0, 0).inflate(75, 75)
  sprite2 = pygame.sprite.Sprite()
  sprite2.image = pygame.Surface((75, 75))
  sprite2.image.fill((0, 255, 0))
  sprite2.rect = pygame.Rect(*window.get_rect().center, 0, 0).inflate(75, 75)
  
  all_group = pygame.sprite.Group([sprite2, sprite1])
  test_group = pygame.sprite.Group(sprite2)
  
  run = True
  while run:
      for event in pygame.event.get():
          if event.type == pygame.QUIT:
              run = False
  
      sprite1.rect.center = pygame.mouse.get_pos()
      collide = pygame.sprite.spritecollide(sprite1, test_group, False)
  
      window.fill(0)
      all_group.draw(window)
      for s in collide:
          pygame.draw.rect(window, (255, 255, 255), s.rect, 5, 1)
      pygame.display.flip()
  
  pygame.quit()
  exit()
  

有关与面具的碰撞，请参阅How can I make a collision mask? 或Pygame mask collision

另见Collision and Intersection

• pygame.sprite.spritecollide() / collide_circle

  repl.it/@Rabbid76/PyGame-spritecollidecollidecircle

  import pygame
  
  pygame.init()
  window = pygame.display.set_mode((250, 250))
  
  sprite1 = pygame.sprite.Sprite()
  sprite1.image = pygame.Surface((80, 80), pygame.SRCALPHA)
  pygame.draw.circle(sprite1.image, (255, 0, 0), (40, 40), 40)
  sprite1.rect = pygame.Rect(*window.get_rect().center, 0, 0).inflate(40, 40)
  sprite2 = pygame.sprite.Sprite()
  sprite2.image = pygame.Surface((80, 89), pygame.SRCALPHA)
  pygame.draw.circle(sprite2.image, (0, 255, 0), (40, 40), 40)
  sprite2.rect = pygame.Rect(*window.get_rect().center, 0, 0).inflate(80, 80)
  
  all_group = pygame.sprite.Group([sprite2, sprite1])
  test_group = pygame.sprite.Group(sprite2)
  
  run = True
  while run:
      for event in pygame.event.get():
          if event.type == pygame.QUIT:
              run = False
  
      sprite1.rect.center = pygame.mouse.get_pos()
      collide = pygame.sprite.spritecollide(sprite1, test_group, False, pygame.sprite.collide_circle)
  
      window.fill(0)
      all_group.draw(window)
      for s in collide:
          pygame.draw.circle(window, (255, 255, 255), s.rect.center, s.rect.width // 2, 5)
      pygame.display.flip()
  
  pygame.quit()
  exit()
  

---

这对您的代码意味着什么？

pygame.Surface.get_rect.get_rect() 返回一个大小为表面对象，它总是从 (0, 0) 开始，因为表面对象没有位置。矩形的位置可以由关键字参数指定。例如，矩形的中心可以用关键字参数center指定。这些关键字参数在返回之前应用于 pygame.Rect 的属性（有关关键字参数的列表，请参阅 pygame.Rect）。
见 *Why is my collision test always returning 'true' and why is the position of the rectangle of the image always wrong (0, 0)?

您根本不需要Sprite 和Bullet 的x 和y 属性。请改用 rect 属性的位置：

#Define the sprite class
class Sprite:
    def __init__(self, x, y, name):
        self.image = pygame.image.load(name)
        self.rect = self.image.get_rect(topleft = (x, y))

    def render(self):
        window.blit(self.image, self.rect)

# Define the bullet class to create bullets          
class Bullet:
    def __init__(self, x, y):
        self.bullet = pygame.image.load("user_bullet.BMP")
        self.rect = self.bullet.get_rect(topleft = (x + 23, y))

    def render(self):
        window.blit(self.bullet, self.rect)

使用pygame.Rect.colliderect() 检测Sprite 和 Bullet 实例之间的冲突。
见How to detect collisions between two rectangular objects or images in pygame：

my_sprite = Sprite(sx, sy, name)
my_bullet = Bullet(by, by)

while True:
    # [...]

    if my_sprite.rect.colliderect(my_bullet.rect):
        printe("hit")

Answer 2

根据我对 pygame 的了解，您只需要使用 colliderect 方法检查两个矩形是否重叠。一种方法是在您的 Bullet 类中使用一个方法来检查冲突：

def is_collided_with(self, sprite):
    return self.rect.colliderect(sprite.rect)

然后你可以这样称呼它：

sprite = Sprite(10, 10, 'my_sprite')
bullet = Bullet(20, 10)
if bullet.is_collided_with(sprite):
    print('collision!')
    bullet.kill()
    sprite.kill()

Answer 3

对于您尝试使用内置方法执行的操作，有一个非常简单的方法。

这是一个例子。

import pygame
import sys

class Sprite(pygame.sprite.Sprite):
    def __init__(self, pos):
        pygame.sprite.Sprite.__init__(self)
        self.image = pygame.Surface([20, 20])
        self.image.fill((255, 0, 0))
        self.rect = self.image.get_rect()

        self.rect.center = pos

def main():
    pygame.init()
    clock = pygame.time.Clock()
    fps = 50
    bg = [255, 255, 255]
    size =[200, 200]


    screen = pygame.display.set_mode(size)

    player = Sprite([40, 50])
    player.move = [pygame.K_LEFT, pygame.K_RIGHT, pygame.K_UP, pygame.K_DOWN]
    player.vx = 5
    player.vy = 5


    wall = Sprite([100, 60])

    wall_group = pygame.sprite.Group()
    wall_group.add(wall)

    player_group = pygame.sprite.Group()
    player_group.add(player)

    # I added loop for a better exit from the game
    loop = 1
    while loop:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                loop = 0

        key = pygame.key.get_pressed()

        for i in range(2):
            if key[player.move[i]]:
                player.rect.x += player.vx * [-1, 1][i]

        for i in range(2):
            if key[player.move[2:4][i]]:
                player.rect.y += player.vy * [-1, 1][i]

        screen.fill(bg)

        # first parameter takes a single sprite
        # second parameter takes sprite groups
        # third parameter is a do kill command if true
        # all group objects colliding with the first parameter object will be
        # destroyed. The first parameter could be bullets and the second one
        # targets although the bullet is not destroyed but can be done with
        # simple trick bellow
        hit = pygame.sprite.spritecollide(player, wall_group, True)

        if hit:
            # if collision is detected call a function in your case destroy
            # bullet
            player.image.fill((255, 255, 255))

        player_group.draw(screen)
        wall_group.draw(screen)

        pygame.display.update()
        clock.tick(fps)

    pygame.quit()
    # sys.exit


if __name__ == '__main__':
    main()

Answer 4

为项目符号创建一个组，然后将项目符号添加到该组中。

我会做的是： 在玩家的课程中：

def collideWithBullet(self):
    if pygame.sprite.spritecollideany(self, 'groupName'):
        print("CollideWithBullet!!")
        return True

在某处的主循环中：

def run(self):
    if self.player.collideWithBullet():
         print("Game Over")

希望这对你有用！！！

Answer 5

在 Sprite 类中，尝试添加一个 self.mask 属性
self.mask = pygame.mask.from_surface(self.image)
以及 Sprite 类中的 collide_mask 函数，代码如下：

    def collide_mask(self, mask):
        collided = False
        mask_outline = mask.outline()
        self.mask_outline = self.mask.outline()
        for point in range(len(mask_outline)):
            mask_outline[point] = list(mask_outline[point])
            mask_outline[point][0] += bullet.x
            mask_outline[point][1] += bullet.y
        for point in range(len(self.mask_outline)):
            self.mask_outline[point] = list(mask_outline[point])
            self.mask_outline[point][0] += self.x
            self.mask_outline[point][1] += self.y
        for point in mask_outline:
            for self_mask_point in self.mask_outline:
                if point = self_mask_point:
                    collided = True
        return collided