Re: [pygame] Game stutters

[Luke Paireepinart <rabidpoobear@xxxxxxxxx>]

Ryan Charpentier wrote:
> Hi, i'm currently working on a breakout clone and i'm pretty much 
> done. However every few seconds the game freezes for like a split 
> second, causing my game to stutter. It's not really a big deal but it 
> is annoying. I stripped out everything except the code to make the 
> ball bounce around the screen but it's still doing it. I'm using 
> python 2.4.3 and pygame 1.7.1 on Windows XP.
>
> Heres the code:
>
>
> import pygame
> from pygame.locals import *
>
> def main():
>   pygame.init()
>   screen = pygame.display.set_mode((640, 480))
>   screenRect = screen.get_rect()
>   clock = pygame.time.Clock()
>  
>   #ball Variables
>   ballColour = (255, 0, 0)
>   ballX, ballY = screenRect.center
>   ballRadius = 5
>   ballSpeedX, ballSpeedY = 5, 5
>   ballRect = pygame.Rect (ballX, ballY, ballRadius * 2, ballRadius * 2)
>   ballImage = pygame.Surface((ballRadius * 2, ballRadius * 2))
>   pygame.draw.circle(ballImage, ballColour, (ballRadius, ballRadius), 
> ballRadius)
>  
>   while True:
>     #handle user input
>     for event in pygame.event.get():
>       if event.type == QUIT:
>         pygame.quit()
>         return
>        
>     #move ball
>     ballRect.move_ip(ballSpeedX, ballSpeedY)
>    
>     #make sure ball stays within screen boundaries
>     if ballRect.left <= screenRect.left:
>       ballSpeedX = -ballSpeedX
>     elif ballRect.right >= screenRect.right:
>       ballSpeedX = -ballSpeedX
>     elif ballRect.top <= screenRect.top:
>       ballSpeedY = -ballSpeedY
>     elif ballRect.bottom >= screenRect.bottom:
>       ballSpeedY = -ballSpeedY
>    
>     #clear screen
>     screen.fill((0, 0, 0))
>    
>     #draw ball
>     screen.blit(ballImage, ballRect)
>    
>     pygame.display.update()
>    
>     clock.tick(40)
>
> if __name__ == "__main__":
>   main()
If the ball's just bouncing around why not do
screen.fill((0,0,0),ballRect)
screen.blit((ballImage,ballRect)
pygame.display.update(ballRect)