Python/Pygame字符快速闪烁

Question

我正在使用PyGame制作一个小游戏，运行游戏时我的角色一直在快速闪烁，我不明白为什么。有人可以帮帮我吗？这是我的代码：

import pygame, sys, time, math
from pygame.locals import *

pygame.init()
fpsClock = pygame.time.Clock()

screen = pygame.display.set_mode((640,480))
pygame.display.set_caption("Hunter vs. Hunter")

keys = [False, False, False, False]
shirtpos = [330,270]
pantspos = [342,322]
helmpos = [349,230]
bowpos = [395,248]
invcounter = 0
arrows=[]

bkdrop = pygame.image.load("Resources\grassybackdrop.gif")
helm = pygame.image.load("Resources\mainhelm.gif")
shirt = pygame.image.load("Resources\mainshirt.gif")
pants = pygame.image.load("Resources\mainpants.gif")
inv = pygame.image.load("Resources\invdisplay.gif")
bow = pygame.image.load("1bow.gif")
arrow = pygame.image.load("arrow.gif")
screen.blit(bkdrop, (0,0))


while 1:
    screen.blit(helm, helmpos)
    screen.blit(shirt, shirtpos)
    screen.blit(pants, pantspos)
    screen.blit(bow, bowpos)
    pygame.display.flip()
    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            sys.exit()

        if event.type==pygame.MOUSEBUTTONDOWN:
            position=pygame.mouse.get_pos()
            arrows.append([math.atan2(position[1]-(shirtpos[1]+32),position[0]-(shirtpos[0]+26)),shirtpos[0]+32,shirtpos[1]+32])

        for bullet in arrows:
            index=0
            velx=math.cos(bullet[0])*10
            vely=math.sin(bullet[0])*10
            bullet[1]+=velx
            bullet[2]+=vely
            if bullet[1]<-64 or bullet[1]>640 or bullet[2]<-64 or bullet[2]>480:
                arrows.pop(index)
            index+=1
            for projectile in arrows:
                arrow1 = pygame.transform.rotate(arrow, 360-projectile[0]*57.29)
                screen.blit(arrow1, (projectile[1], projectile[2]))

        if event.type == pygame.KEYDOWN:   
            if event.key == K_w:
                keys[0]=True
            elif event.key == K_a:
                keys[1]=True
            elif event.key == K_s:
                keys[2]=True
            elif event.key == K_d:
                keys[3]=True
            elif event.key == K_TAB:
                screen.blit(inv, (147,96))
                invcounter+=1


        if event.type == pygame.KEYUP:
            if event.key == K_w:
                keys[0]=False
            elif event.key == K_a:
                keys[1]=False
            elif event.key == K_s:
                keys[2]=False
            elif event.key == K_d:
                keys[3]=False


    if invcounter % 2 == 0:
        if keys[0] == True:
            shirtpos[1]-=2.5
            pantspos[1]-=2.5
            helmpos[1]-=2.5
            bowpos[1]-=2.5
        if keys[1] == True:
            shirtpos[0]-=2.5
            pantspos[0]-=2.5
            helmpos[0]-=2.5
            bowpos[0]-=2.5
        if keys[2] == True:
            shirtpos[1]+=2.5
            pantspos[1]+=2.5
            helmpos[1]+=2.5
            bowpos[1]+=2.5
        if keys[3] == True:
            shirtpos[0]+=2.5
            pantspos[0]+=2.5
            helmpos[0]+=2.5
            bowpos[0]+=2.5
        if pantspos[1] > 386:
            pantspos[1] = 386
            shirtpos[1] = 336
            helmpos[1] = 296
            bowpos[1] = 310


    if invcounter % 2 == 0:
        screen.blit(bkdrop, (0,0))

    pygame.display.flip()

    fpsClock.tick(60)

Answer 1

您正在翻转屏幕两次。一次在您绘制对象之后，一次在循环底部附近。

此外，您似乎有对应于 event.keydown 类型事物的 blit。不确定这些是否是您实际的玩家精灵对象或其他辅助对象，但理想情况下我认为您不想在那里处理任何 blitting - 您只想更改对象的状态（我不一定是说 'make a state machine' 如果你不写一个，我的意思是 - 在这里处理事件......稍后再画）

理想情况下，PyGame 的 'dummy loop' 类似于这样：

while True:
    for event in pygame.event.get():
        # handle events

    MyScreenObject.fill((0, 0, 0)) # or whatever background you're using
    VisibleObjectGroup.draw() # draw all objects that can be seen in a sprite.Group -- use these and love these, they're loaded with good things
    pygame.display.flip() #call this ONE time per loop
    MyFPSClock.tick(FPS)

我的意思是那里没有碰撞检查或其他任何东西，但这就是最终的想法——在处理完事件之前不要更新屏幕。

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