Question

python初学者关于碰撞的问题

自学python三个月，想请教很初级的问题，不知道可以问谁。是《python编程：从基础到实践》第十三章的课后题。
全部代码在下方，目的是想做一个水珠从屏幕上方任意位置落下，下面键盘控制的游戏角色左右移动接住后水珠消失的游戏。因为后续应该在水珠消失后再补充新的，所以水珠建立了组，我使用了spritecollide来检查碰撞（ def catch_water(doll,waters)）。但是发现如果水珠本来就能掉落在角色上时，水珠会自动消失。如果是用键盘移动角色才接住水珠，那水珠不会消失，继续下落。也就是说检查碰撞时，好像并没有更新精灵，想知道怎么解决这个问题呀。
开始接触代码以后深感智商不够用，不知道有没有讲的很啰嗦，总之谢谢各位啦。

pygame.init()
bg_color=(20,40,50)
screen=pygame.display.set_mode((1200,800))
random_number=randint(1,1200)
dropspeed=3
speed_factor=5

class Doll(Sprite):
def __init__(self, screen):
super(Doll, self).__init__()
self.screen = screen
self.image=pygame.image.load('timg.bmp')
self.rect=self.image.get_rect()
self.screen_rect=self.screen.get_rect()
self.rect.centerx=self.screen_rect.centerx
self.rect.bottom=self.screen_rect.bottom
self.moving_right=False
self.moving_left=False

def blitme(self):
self.screen.blit(self.image,self.rect)

def update(self):
if self.moving_right and self.rect.right<self.screen_rect.right:
self.rect.centerx+=speed_factor
if self.moving_left and self.rect.left>0:
self.rect.centerx-=speed_factor

class Water(Sprite):
def __init__(self,screen,random_number):
super(Water, self).__init__()
self.screen=screen
self.image=pygame.image.load("raindrop.bmp")
self.rect=self.image.get_rect()
self.screen_rect=self.screen.get_rect()
self.rect.centerx=random_number
self.rect.top=0
self.y=float(self.rect.y)
def blitme(self):
self.screen.blit(self.image,self.rect)
def update(self):
self.y+=dropspeed
self.rect.y=self.y

def check_keydown_events(event,doll):
if event.key==pygame.K_RIGHT:
doll.moving_right=True
elif event.key==pygame.K_LEFT:
doll.moving_left=True

def check_keyup_events(event,doll):
if event.key==pygame.K_RIGHT:
doll.moving_right=False
elif event.key==pygame.K_LEFT:
doll.moving_left=False

def event_check(doll):
for event in pygame.event.get():
if event.type==pygame.QUIT:
sys.exit()
elif event.type==pygame.KEYDOWN:
check_keydown_events(event,doll)
elif event.type==pygame.KEYUP:
check_keyup_events(event,doll)

def catch_water(doll,waters):

water=Water(screen,random_number)
doll=Doll(screen)
catch=pygame.sprite.spritecollide(doll,waters,True)

def rungame():

water=Water(screen,random_number)
waters=Group()

waters.add(water)
doll=Doll(screen)

while True:
screen.fill(bg_color)
doll.blitme()
waters.draw(screen)
pygame.display.flip()
event_check(doll)
doll.update()
waters.update()
catch_water(doll,waters)
rungame()

Answer 1

#你的catch_water没用啊
#稍微改了一下 不知道是不是你要的效果

import pygame.sprite
import random
import sys

class Doll(pygame.sprite.Sprite):
    speed_factor = 1
    def __init__(self, screen):
        super(Doll, self).__init__()
        self.screen = screen
        self.image=pygame.image.load("hand.png")
        self.rect=self.image.get_rect()
        self.screen_rect=self.screen.get_rect()
        self.rect.centerx=self.screen_rect.centerx
        self.rect.bottom=self.screen_rect.bottom
        self.moving_right=False
        self.moving_left=False

    def blit_me(self):
        self.screen.blit(self.image,self.rect)

    def update(self):
        if self.moving_right and self.rect.right<self.screen_rect.right:
            self.rect.centerx+=Doll.speed_factor
        if self.moving_left and self.rect.left>0:
            self.rect.centerx-=Doll.speed_factor

class Water(pygame.sprite.Sprite):
    dropspeed=0.1
    def __init__(self,screen,random_number):
        super(Water, self).__init__()
        self.screen=screen
        self.image=pygame.image.load("drop.png")
        self.rect=self.image.get_rect()
        self.screen_rect=self.screen.get_rect()
        self.rect.centerx=random_number
        self.rect.top=0
        self.y=float(self.rect.y)

    def blit_me(self):
        self.screen.blit(self.image,self.rect)

    def update(self):
        self.y+=Water.dropspeed
        self.rect.y=self.y

def check_key_down_events(event,doll):
    if event.key==pygame.K_RIGHT:
        doll.moving_right=True
    elif event.key==pygame.K_LEFT:
        doll.moving_left=True

def check_key_up_events(event,doll):
    if event.key==pygame.K_RIGHT:
        doll.moving_right=False
    elif event.key==pygame.K_LEFT:
        doll.moving_left=False

def event_check(doll):
    for event in pygame.event.get():
        if event.type==pygame.QUIT:
            sys.exit()
        elif event.type==pygame.KEYDOWN:
            check_key_down_events(event,doll)
        elif event.type==pygame.KEYUP:
            check_key_up_events(event,doll)


def run_game():
    pygame.init()
    bg_color = (20, 40, 50)
    screen = pygame.display.set_mode((1000, 500))

    random_number = random.randint(1, 1000)
    water=Water(screen,random_number)
    doll=Doll(screen)

    while True:
        screen.fill(bg_color)
        doll.blit_me()
        water.blit_me()
        pygame.display.flip()
        event_check(doll)
        doll.update()
        water.update()
        if pygame.sprite.collide_rect(doll,water) or water.y>500:
            random_number = random.randint(1, 1000)
            water = Water(screen, random_number)

run_game()