Message-ID:	<36324EEB.B48CF1D@mail.bip.net>
From:	Conan <Dr DOT Conan AT mail DOT bip DOT net>
Organization:	Apocalypse Inc.
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Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Level-map problem
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Date:	Sun, 25 Oct 1998 00:04:27 +0200
To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

Leif Svensson wrote:

> Hello!
> I´m writing a 2d game and I got a problem that I think that maybe
> someone
> out there can help me with.
> I´m having a problem with my map-system.
> It should read in which tile who is where (There are 70 of them (10*7)
> and
> then refer to a object to keep the map-files small. How do I do this?
> Do you got a better way to solve the whole map-file thing?
> I don´t want any graphics in the file, cause the file will be too big
> then.
> Hope you understand what I mean. If not, Tell me....
>
> Waiting for an answer from a kind soul....
> // Patrik , Sweden
>
> P.S: There´s over 450 tiles D.S

   Hi.

I assume that what yore looking for is a funktion that translates
pixelcoordiantes to tile coordinates.

Meaning that if you hawe the coordinate you should be able to tell what
tile youre on.

If there is only 70 (7*10) then the formula would be:
tileX=pixelX % tileWidth
tileY=pixelY % tileHeight

and then the tile is (tileY*10)+tileX

this is werry slow.
but if your tiles are 16,32 or 64 and so on... pixels wide then you
could do it like this:
tile=32^2

tileX=pixelX & 31
tileY=pixelY & 31
and then the tile is (tileY*10)+tileX

Hope this helps... hope this is what you asked for!!! :)

/Conan

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