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From: rap@peck.ardent.com (Rob Peck)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Trying to do page-flipping style animation (HELP)
Message-ID: <8866@ardent.UUCP>
Date: 27 Oct 89 17:11:52 GMT
References: <1359@jimi.cs.unlv.edu>
Sender: news@ardent.UUCP
Reply-To: rap@peck.ardent.com (Rob Peck)
Organization: Ardent Computer Corp., Sunnyvale, CA
Lines: 30

In article <1359@jimi.cs.unlv.edu> jack@jimi.cs.unlv.edu (Jack Alexander) writes:
>I am trying to do simple full screen animation by using page flipping.
>I am running into problems because I don't know how to re-assign bitmaps
> .....
>I've tried setting the screen's bitmap pointer to one of my bitmaps, but to
>no avail.



Here is what you might NOT be doing, but must do to make the new bitmap show:

	Forbid();

	/* HERE: modify the bitmap pointer for the your screen ("myscreen")
		 to point to your bitmap.  Jim Mackraz code examples usually
		 put the Forbid() and Permit() here I believe to prevent
		 Intuition from remaking the display while you are fiddling
		 with internal data structures which would affect the
		 display.  User could pull down a screen just when you are
		 munging the pointers and the task running the screen
		 recreation could get a wierd value for the bitmap pointer.
	*/
	
	Permit();

	MakeScreen(myscreen);
	RethinkDisplay();


Rob Peck