S
Message: 8
Date: Fri, 25 Feb 2005 10:33:47 -0800
From: Scott Rossi <[EMAIL PROTECTED]>
Subject: Re: ANN: Bouncing Ball Tools
To: How to use Revolution <[email protected]>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset="US-ASCII"

Recently, Jim Hurley  wrote:

 I got intrigued with simulations, all kinds. Recently I have
 taken up bouncing balls. And I am having a hard time letting go.
 ...
 > go url  http://home.infostations.net/jhurley/BouncingBallTools.rev

Ironically, you *gotta* let go for the thing to work. :-)

This is really fun stuff -- thanks Jim.  More ideas for us to develop
games...

(BTW, on two of the cards, the ball "escaped" through the bottom left corner
of the card, maybe some kind of X = 0 or Y > height of the card thing.)

Regards,

Scott Rossi

Scott,

I found the problem. I was letting the ball be reflected by the rectangle interior to the screen walls by a distance equal to the radius of the ball, but I calculated the *intersection* of the ball trajectory with the screen walls instead of that rectangle. The tracing (pen down) now remains totally within this inner rectangle.

The corrected version is again:

 go url  "http://home.infostations.net/jhurley/BouncingBallTools.rev";

Pessimist: Life is just one damn bug after another.

Thanks again,

Jim


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