Re: [pygame] scrolling maps

["Alex" <alex@quad.com.ar>]

see my src code on this thread, the technique I use does blit directly to
the screen surface.. I'd think this is the fastest way, but I might be
wrong.

----- Original Message -----
From: "Chris" <c.gersch@bigpond.net.au>
To: <pygame-users@seul.org>
Sent: Sunday, October 20, 2002 9:05 PM
Subject: Re: [pygame] scrolling maps


> I've been implementing scrolling by drawing the entire map onto a surface
> larger than the display window, and blitting only the visible portion of
the
> full map surface to the display window. Are there any disadvantages to
doing
> it this way? I could well be wrong, but at a guess it seems to me that
this
> would be faster than nested for loops.
>
>
> ----- Original Message -----
> From: "Pete Shinners" <shredwheat@attbi.com>
> To: <pygame-users@seul.org>
> Sent: Monday, October 21, 2002 3:25 AM
> Subject: Re: [pygame] scrolling maps
>
>
> > Gabriele Farina wrote:
> > > How can I scroll my pygame screen??
> > > I got a TXT file where I saved a lot of char...any char represents a
> > > 25x25px image, that I blit on the screen...when The game starts, I see
> > > only 1/4 o the map...I want the my Hero stay al the centre of the map,
> > > and when ho moves, pygame has to del the images we don't see and has
to
> > > draw the one we can see...
> > >
> > > Someone have something to send to me or have some link where I can see
> > > any example?
> >
> > fullscreen scrolling doesn't mean we "delete" what is seen or anything
> like
> > that. the regular way to do things is redraw the entire screen each
frame.
> >
> > of course if the background doesn't always scroll you can find ways to
> > optimize this, but it gets tricky to create consistent framerates if you
> > draw the background sometimes and not others.
> >
> > if you have a dictionary with the proper image at each "x, y"
coordinate,
> > the code would look something like this
> >
> >
> > tilewidth = 50
> > tileheight = 50
> > game_map = {dictionary of images for "x,y" pairs}
> > map_position = 10, 10
> >
> > def draw_map(screen):
> >   screenrect = screen.get_rect()
> >   for y in range(0, screenrect.height, tileheight):
> >     for x in range(0, screenrect.width, tilewidth):
> >       pos = map_position[0]+x, map_position[1]+y
> >       try: img = game_map[pos]
> >       except KeyError: continue #off edge of map
> >       blitpos = x*tilewidth, y*tileheight
> >       screen.blit(img, blitpos)
> >
> >
> > anyways, that will do it, (give or take why my email editor didn't catch
> as
> > an error). you can move the map by chaning "map_position", which should
be
> > the tile drawn at the topleft corner
> >
> >
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> >
>
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