Re: [pygame] Smooth scrolling ?

["Dmitry Borisov" <jbors@xxxxxxx>]

Yeah,
I was under the same impression, but it works the same way in fullscreen :(
The problem with movement may be only on my machine but I can tell that
Flash works very smooth, so...
I'll try to get timings after flips and see what's the exact problem. It
might be that SDL does not use vsync at all on Windows. Oh well..
Dmitry/

----- Original Message ----- 
From: "Guillaume Proux" <gproux@xxxxxxxxxxxxxx>
To: <pygame-users@xxxxxxxx>
Sent: Wednesday, September 28, 2005 10:55 AM
Subject: Re: [pygame] Smooth scrolling ?


> 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()
> >
# --------------------------------------------------------------------------
-- 
> >
> >
>
>
>