From:	punjab AT ix DOT netcom DOT com (//)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: sprites and ALLEGRO'S draw_sprite();
Date:	23 Jan 1998 22:46:29 GMT
Organization:	Netcom
Lines:	23
Message-ID:	<6ab6k5$69g@sjx-ixn4.ix.netcom.com>
References:	<19980123161800 DOT LAA01145 AT ladder01 DOT news DOT aol DOT com>
NNTP-Posting-Host:	stk-ca1-22.ix.netcom.com
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

In <19980123161800 DOT LAA01145 AT ladder01 DOT news DOT aol DOT com> pitel AT aol DOT com
(Pitel) writes: 
>
>Hello 
>
>Can someone help me, i am trying to display
>a sprite animation on a screen that i have place 
>a background bitmap image, but as i move the sprite
>the sprite destroyes the background (erases it).
>
>how can i save the background image and restore it 
>when the sprite has moved off that area.
>
>Thanks 
>
>Pitel AT aol DOT com
>Eric  

Use a Z-buffer algorithm as it alows you to consider depth and will
write pixels that are nearest to you--not in the background.  The
Z-buffer contains the image at a specific frame corresponding to the
displayed images z coord during that frame (search the web for a more
robust description).  Hope that helps.

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