Re: [pygame] Smooth scrolling ?

[Guillaume Proux <gproux@xxxxxxxxxxxxxx>]

Hi Dmitry,

It is working very smooth on my PC at least.
Another thing that I found out when doing my football field demo a few 
years ago (see 
http://aspn.activestate.com/ASPN/Mail/Message/pygame-users/1446979) that 
DOUBLEBUF and HWSURFACE have meaning only in FULLSCREEN mode.

Try it out :)

Guillaume

Dmitry Borisov wrote:
> Guys,
> I'm just about to give up on smooth scrolling with pygame. I tried many 
> different ways but getting jerky motions no matter what I do.
> The code is below and it simply blits the pic on a screen and flips the 
> screen when the vsync backtrace is up. Then it repeats. In my assumption 
> it should be smooth, but it is not :(
> Any helping hand ?
> Thanks a lot,
> Dmitry/
>  
> pygame-1.6
> WinXP, P4-1.8
>  
> # ---------------------------------------------------------------------------- 
>
> import pygame
> pygame.init()
>  
> screen= pygame.display.set_mode( (800,600), 
> pygame.DOUBLEBUF|pygame.HWSURFACE, 32 )
>  
> i= 0
> f= pygame.font.Font( 'data/arialn.ttf', 80 )
> s= f.render( 'Scrolling', 1, (0xff,0xee,0x00) )
> surf= pygame.Surface( s.get_size(), pygame.SRCALPHA, 32 )
> surf.blit( s, (0,0) )
> screen.fill( (255,255,255) )
> pygame.display.update()
> while i< 800:
>   screen.fill( (255,255,255), (0,200,800,surf.get_height()) )
>   screen.blit( surf, ( i, 200 ) )
>   pygame.display.flip()
>   pygame.event.poll()
>   i+= 1
>  
> pygame.quit()
> # ---------------------------------------------------------------------------- 
>
>