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From: ewhac@well.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: BOBS
Message-ID: <4098@well.UUCP>
Date: Thu, 1-Oct-87 06:32:08 EDT
Article-I.D.: well.4098
Posted: Thu Oct  1 06:32:08 1987
Date-Received: Sat, 3-Oct-87 10:35:09 EDT
References: <146@dalcsug.UUCP>
Reply-To: ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab)
Organization: Lt. Col. Oliver North, Overseas Shipping and Receiving.
Lines: 29

In article <146@dalcsug.UUCP> peter@dalcsug.UUCP (Peter Philip) writes:
>I am trying to write an arcade type game (beserk)...
					   ^^^^^^
	Sorry, "Berserk" is Copyright 1987 by Leo L. Sch.....  Oh.  *THAT*
Bezerk.

>...but cannot figure
>out how to register BOB to background colisions (like walls, debris, etc).
>I have no problem getting BOB to BOB or BOB to border crashes -- so
>am I missing something obvious?  

	Yes and no.  BOBs *are* the background.  If you draw into the
background using anything other than DrawGList(), the collision routines
won't know about it.  DrawGList() doesn't check the background before
drawing a BOB into it.

	There are two ways around this.  One is to write your own custom
blitter code (GAK!).  The other (off the top of my head) is to define your
walls, debris, etc. as a BOB, too, and never move it.  I have no idea how
much this will degrade performance.  But since your walls are now a BOB, you
can easily plug it into your collision handlers.

	Hope this helps.

_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
Leo L. Schwab -- The Guy in The Cape	ihnp4!ptsfa -\
 \_ -_		Recumbent Bikes:	      dual ---> !{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