Path: utzoo!utgpu!utstat!jarvis.csri.toronto.edu!rutgers!apple!oliveb!sun!swap!page
From: page%swap@Sun.COM (Bob Page)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Boing! demo
Message-ID: <107389@sun.Eng.Sun.COM>
Date: 31 May 89 18:46:05 GMT
References: <4946@umd5.umd.edu>
Sender: news@sun.Eng.Sun.COM
Reply-To: page@sun.UUCP (Bob Page)
Organization: Sun Microsystems, Mountain View
Lines: 23

brett@umd5.umd.edu (Brett Bourbin) wrote:
>I was wondering how the first Boing! demo did the movement of the ball?

The first one?  You mean the one that said "Amiga Inc" in the background?

>I know that the program draws the ball in small increments, in different
>colors, and then uses color rotations to make the ball spin.

Yep.  You can catch some of that by keeping the boing screen to front and
watching it draw the ball.  Also by bringing up a palette tool and looking
at the pen colors.

>I have heard that the demo changed the copper list to alter the starting
>location of the bitplanes holding the ball image to move it up and down.

I heard it too.  To quote a famous duck: "I cheated my ass off!"

>[It is so hard not to go directly to the hardware when you know you can 
>solve the task in a matter of minutes by doing so.  8^) ]

Good thing you got that smiley in there!

..bob