Pygame 精灵运动速度太慢

Question

我最近在使用Pygame开发游戏。它载入了两种不同的背景（未来用于视差滚动），然后添加了一个可以用箭头控制并能够跳跃和左右移动的精灵。当我运行程序时，所有元素都加载得很好，但当我试图控制精灵时，反应非常缓慢，我必须不断重新按箭头键才能使其移动。与我以前的另一个程序中使用的代码相同，该程序仅加载背景和精灵并控制精灵的移动。对于我的新程序，我只是添加了屏幕缩放和全屏选项。那就会变得很慢。是什么导致了速度变慢？我需要更好地优化代码吗？

如果这有助于解决问题，我还注意到，当我快速按下箭头键以外的其他键时，它会以正确的速度移动。似乎这样做有更新效果。是否可能需要进行某种更新？此外，在我的if语句中已经使用了“Pygame.display.update()”来控制精灵键。

import pygame
from pygame.locals import *

pygame.init()

#two backgrounds
bg = pygame.image.load('/Users/luke.redwine/Documents/Python/PyGame/Llama game/Llama imaging/backgrounds concepts/Mountains/PPP_BG1.png')
fg = pygame.image.load('/Users/luke.redwine/Documents/Python/PyGame/Llama game/Llama imaging/backgrounds concepts/Mountains/PPP_fg1.png')

clock = pygame.time.Clock()

def Sresize():
    #screen resize:
    pygame.event.pump()                                                                 

    event=pygame.event.wait()                                                            

    if event.type==QUIT:
        pygame.quit()                                              

    elif event.type==VIDEORESIZE:                                                           
        sprite.screen=pygame.display.set_mode(event.dict['size'],HWSURFACE|DOUBLEBUF|RESIZABLE)
        sprite.screen.blit(pygame.transform.scale(bg,event.dict['size']),(0,0))
        sprite.screen.blit(pygame.transform.scale(fg,event.dict['size']),(0,0))
        pygame.display.update()


#PLAYER CLASS

class player(object):
    def __init__(self,x, y, width, height):     
        self.x = x                                   
        self.y = y                          
        self.width = width                            
        self.height = height                          
        self.velocity = 15
        self.isJump = False
        self.jumpCount = 7
        self.right = False
        self.left = False
        self.walkCount = 0
        self.screen = pygame.display.set_mode((1280, 800), HWSURFACE|DOUBLEBUF|RESIZABLE)
        self.walkRight = [pygame.image.load('/Users/luke.redwine/Documents/Python/PyGame/Examples/sprite-Game/sprite characters main/R %s.png' % frame) for frame in range(1, 9)]
        self.walkLeft = [pygame.image.load('/Users/luke.redwine/Documents/Python/PyGame/Examples/sprite-Game/sprite characters main/L %s.png' % frame) for frame in range(14, 21)]
        self.char = pygame.image.load('/Users/luke.redwine/Documents/Python/PyGame/Examples/sprite-Game/sprite characters main/character 25.png')


    def draw(self, screen):                         

        if self.walkCount + 1 >= 8:  
            self.walkCount = 0      

        if self.left:
            self.screen.blit(self.walkLeft[self.walkCount//1], (self.x, self.y))
            self.walkCount += 1

        elif self.right:
            self.screen.blit(self.walkRight[self.walkCount//1], (self.x, self.y))
            self.walkCount += 1

        else:
            self.screen.blit(self.char, (self.x, self.y))



sprite = player(4, 480, 16, 16)

def redrawGamescreen():                      

    sprite.screen.blit(pygame.transform.scale(bg,(1280, 800)),(0,0))   
    sprite.screen.blit(pygame.transform.scale(fg,(1280, 800)),(0,0))   
    sprite.draw(sprite.screen)
    pygame.display.update()



#mainloop:-----------------------------------------------------------------
run = True

while run:
    keys = pygame.key.get_pressed()
    Sresize()
    clock.tick(20)
#left

    if keys[pygame.K_LEFT] and sprite.x > sprite.velocity:
        sprite.x -= sprite.velocity
        sprite.left = True
        sprite.right = False

#right 

    elif keys[pygame.K_RIGHT] and sprite.x < 1280 - sprite.width - sprite.velocity:
        sprite.x += sprite.velocity
        sprite.right = True
        sprite.left = False

#otherwise, stand still

    else:
        sprite.right = False
        sprite.left = False
        sprite.walkCount = 0

#jumping


    if not(sprite.isJump):

        if keys[pygame.K_SPACE]:
            sprite.isJump = True
            sprite.right = False
            sprite.left = False

    else:
        if sprite.jumpCount >= -7:
            neg = 1        
            pygame.display.update()
            if sprite.jumpCount < 0:
                neg = -1

            sprite.y -= (sprite.jumpCount ** 2) * 0.5 * neg 
            sprite.jumpCount -= 1

        else:
            sprite.isJump = False
            sprite.jumpCount = 7 
            sprite.velocity = 15

    redrawGamescreen()

pygame.quit()

- Luke Redwine

Answer 1

问题在于调用了 event=pygame.event.wait()。请注意，pygame.event.wait() 等待来自队列的单个事件。如果队列为空，该函数将等待直到有一个事件被创建。这将导致你的游戏出现卡顿。问题加剧的原因是在此之前调用了pygame.event.pump()。

pygame.event.pump()                                                                 
event=pygame.event.wait()

请使用pygame.event.get()代替：

events=pygame.event.get()

pygame.event.get()会清空事件队列并获取所有事件消息。

例如:

def HandleEvents():
                                                                   
    events = pygame.event.get()                                                            
    for event in events:
        if event.type==QUIT:
            pygame.quit()                                              

        elif event.type==VIDEORESIZE:                                                           
        
            sprite.screen=pygame.display.set_mode(event.dict['size'],HWSURFACE|DOUBLEBUF|RESIZABLE)
            sprite.screen.blit(pygame.transform.scale(bg,event.dict['size']),(0,0))
            sprite.screen.blit(pygame.transform.scale(fg,event.dict['size']),(0,0))
            pygame.display.update()

注意，为了良好的控制流程，必须在应用程序循环中实现事件循环。事件循环必须处理所有用户输入。

- Rabbid76