游戏运行缓慢，因为您
START_Image在每一帧中都加载。
pygame.image.load这是非常昂贵的操作，因为它必须从数据存储中读取图像。
START_Image在启动时加载一次
surface = pygame.display.set_mode((width,height))clock = pygame.time.Clock()#for fps#captionpygame.display.set_caption('Survival Island')START_Image = pygame.image.load('START_Image.png').convert()pygame.display.update()在主应用程序循环中不要多次调用。
pygame.display.update()从队列中删除事件，因此每个事件仅获得一次。一次获取事件列表（
events= pygame.event.get()），然后将事件列表传递给函数：
while running: # [...] events = pygame.event.get() for event in events: # [...] if play == True: playGame(events) if canQuitonStart == True: quitonStart(events)
此外，在应用程序循环中绘制场景，而不是事件循环中。
pygame.display.update()绘制整个场景后单做1个就足够了。
按钮单击条件错误。它一定要是：
if mousex> 550 and mousey > 350 and mousex <590 and mousey <390:
if 415 < mousex < 415+70 and 190 < mousey < 190+30:
无论如何，我建议使用
pygame.Rect和
collidepoint：
if pygame.Rect(415,190,70,30).collidepoint(mousex, mousey):
参见示例：
#packagesimport pygameimport sysfrom sys import exit#initializationpygame.init()#display surfwidth = 600height = 400surface = pygame.display.set_mode((width,height))clock = pygame.time.Clock()#for fps#captionpygame.display.set_caption('Survival Island')START_Image = pygame.image.load('START_Image.png').convert()#variablesmousex = 0mousey = 0#booleansplay = True #entered playmodecanQuitonStart = True #game can be quitted on startdrawStartScreen = True #start screen drawedrunning = True # game is running#definitionsdef quitonStart(events): #quitting the game #can be seen if rect is drawn [pygame.draw.rect(surface,(0,0,255),(550,350,40,40))] global mousex,mousey,running for event in events: if event.type == pygame.MOUSEBUTTONDOWN: #quit on pressing x on start screen if mousex > 550 and mousey > 350 and mousex <590 and mousey <390: print('Exit1') running = Falsedef drawStart(): #drawing start menu surface.blit(START_Image,(0,0))def playGame(events): #play on clicking on "play" global mousex,mousey,canQuitOnStart,drawStartScreen for event in events: if event.type == pygame.MOUSEBUTTONDOWN:if pygame.Rect(415,190,70,30).collidepoint(mousex, mousey): # can be seen if rect is drawn [pygame.draw.rect(surface,(0,0,255),(415,190,70,30))] canQuitonStart = False drawStartScreen = False surface.fill((0,0,0)) if drawStartScreen == True: drawStart() #pygame.draw.rect(surface, (255, 0, 0), (415,190,70,30)) pygame.display.update()def main(): global canQuitOnStart, play, running, mousex, mousey #main loop while running: #get mouse position mousex,mousey = pygame.mouse.get_pos() # fps is 60 clock.tick(120) # quit button event events = pygame.event.get() for event in events: if event.type == pygame.QUIT: running = False # main function if play == True: playGame(events) if canQuitonStart == True: quitonStart(events)if __name__ == '__main__': main()
