From:	Barry Rodewald <bsr AT hn DOT pl DOT net>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Scrolling+sprites
Date:	Sat, 22 Nov 1997 22:52:47 +1300
Lines:	18
Message-ID:	<3476AB6E.C903F505@hn.pl.net>
References:	<3472EE16 DOT 41C6 AT cc DOT hut DOT fi>
NNTP-Posting-Host:	bsr.hn.planet.gen.nz
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Ville Lundberg wrote:

> In my game, the playground have to scroll while ca 15 sprites moves
> around it. But when I do this, by mixing double buffering and Allegros
> scroll_screen, the sprites flicker; they create "ghost" images, when
> running across the scrolling screen. It'looks terrible.

I assume you have a virtual screen setup (using set_gfx_mode()) for the play
area?

Try blitting the background first to a buffer (memory bitmap) then use
draw_sprite() to copy the sprites to the buffer.  Then blit the buffer to
the screen then call scroll_screen to position the viewable part of the
screen.

Hope that this clears it up a bit,
Barry Rodewald.

- Raw text -