Re: A85: Pinball Routine

To: assembly-85@lists.ticalc.org
Subject: Re: A85: Pinball Routine
From: Terry Peng <tpeng@geocities.com>
Date: Mon, 04 Aug 1997 09:28:50 -0700
References: <3.0.3.32.19970803160740.006a53ac@megspo.megsinet.net>
Reply-To: assembly-85@lists.ticalc.org

82nd Deer wrote:
> 
> If someone had all of those, there'd already be a Pinball game...  That's
> practically 90% of the work.  To my knowledge there isn't anything like
> that out there, gonna have to make it yourself.

Not true. Ballistics routines are simple. When I was programming for TI-BASIC 
(don't laugh), I had made ballistic games, and breakout games. Combining the 
algorithms would give you a pinball game. I don't have the BASIC source 
anymore, but I vaguely remember the routines.

Breakout routine:
You need two variables, Xspeed and YSpeed. Each time the ball hits a 
horizontal bar, negate the YSpeed. Each time the ball hits a vertical bar 
negate the XSpeed. 
There should be a main loop; Each loop check for collisions, then add the 
XSpeed to the Xcoordinate, ditto for Y. Notice that X and Y should ALWAYS be 
1,0, or -1

Ballistic (Gravity) routine:
Same variables. Also have an upwards momentum counter. Each loop, if 
momentum!=0 and YSpeed>0 increment it, and decrement momentum. Otherwise, 
decrement YSpeed.  X should always be 1,0, or -1. Each loop, add Xspeed to 
the X coord, ditto for the Y's.

Change the routines around to fit your game. Of course, it is harder to do it 
in assembly, but more importantly MUCH FASTER.

-- 
Terry Peng
email-	tpeng@geocities.com
web-	http://www.geocities.com/SiliconValley/Bay/5104/index.html
This site always has the latest versions of my software.

Follow-Ups:

A85: Pinball Routine

From: Brandon Turok <windowswiz@ibm.net>

References:

Re: A85: Pinball Routine

From: 82nd Deer <eviljim@geocities.com>