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From: ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab)
Newsgroups: comp.sys.amiga.tech,comp.sys.amiga
Subject: Re: Fast 2-D Scrolling Method Needed
Message-ID: <10871@well.UUCP>
Date: 2 Mar 89 09:12:39 GMT
References: <112@dg.dg.com>
Reply-To: ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab)
Organization: n. 1.  The act or process of organizing.
Lines: 21
Quote: "Could you please continue the petty bickering?"  -- Data

In article <112@dg.dg.com> bosch@dg.UUCP (Derek Bosch) writes:
>The entire display is going to
>be roughly 4 lo-res screens high, by 5 lo-res screens wide, so that would 
>be too large to have a SuperBitmap to scroll around (and still have any free
>memory left :^P.  What other options do I have?  [ ... ]

	Well, you could try using 'tiles'.  That is, divide the virtual
screen up into X by Y cells, each of which are a fixed size.  When you have
your cells, you can represent your virtual screen as an array of bytes/words
arranged as X by Y.  Each element in the array serves as an index into the
array of cells you have created.  Thus, you can assemble your entire screen by
blitting smaller cells into it.

	Faery Tale is done this way.  Faery Tale's virtual screen size is
HUGE.

_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
Leo L. Schwab -- The Guy in The Cape	INET: well!ewhac@ucbvax.Berkeley.EDU
 \_ -_		Recumbent Bikes:	UUCP: pacbell > !{well,unicom}!ewhac
O----^o	      The Only Way To Fly.	      hplabs / (pronounced "AE-wack")
"Work FOR?  I don't work FOR anybody!  I'm just having fun."  -- The Doctor