Comments on: Managing multiple balls collisions with Flash

By: rams

rams — Wed, 14 Dec 2011 11:09:52 +0000

i didn`t understood the function of below line.. plz somebody explain….
“dVector = (ballA.xspeed-ballB.xspeed)*normalX+(ballA.yspeed-ballB.yspeed)*normalY”

thanqqqqqqqqq

By: Aby

Aby — Thu, 30 Jun 2011 08:44:04 +0000

Any body…pls help me to stop the balls after 15 sec :(

By: Darren

Darren — Tue, 10 May 2011 06:51:25 +0000

Hi,
this version doesn’t take into account ball’s mass like the one in this page
http://www.emanueleferonato.com/2007/08/19/managing-ball-vs-ball-collision-with-flash/

Can you revise this version ?

By: atoi_power

atoi_power — Thu, 31 Dec 2009 00:32:01 +0000

This cool,

i try to collided between two ball, i mean like pool game but i’m using on press key function, it seem I’ve gone no where, can some one help me on this,,,

By: GhostlyGamer

GhostlyGamer — Wed, 04 Nov 2009 00:57:04 +0000

This is a very cool tutorial, but I was wondering how to make a function for when the mouse rollsover a circle, my _root.lives, goes -1. Is there a way I can go this?

By: Z_dub

Z_dub — Mon, 26 Oct 2009 14:36:58 +0000

hello, im working on a project for school and ive gome to a little roadblock, i hope this is the right thread to post on
hered teh code ive got so far, the names are from a tutorial i used to pretty much start it

chevelle_mc.addEventListener(MouseEvent.MOUSE_UP, carStart)
function carStart(carMove:Event):void{
Mouse.hide()
chevelle_mc.startDrag();
};
//1.
truck_mc.addEventListener(Event.ENTER_FRAME, circleHit);

//2.
function circleHit(truckMove:Event):void {
if (truck_mc.hitTestObject(chevelle_mc) ){
text_mc.visible = true;
} else {
text_mc.visible = false;
}
};

i have two problems, the first is that i have multiple trucks, there all named accordingly, truck_mc, truck2_mc and so on…but only the first one will collide with my ball. where would i put the code to make so that it also collides with the rest of them?
also, i want the video to stop until i can click the ball, and ive seen a lot of other tutorials that say to use a stop() method, where would i put that, and how would i phrase it?

By: Awoke

Awoke — Thu, 20 Nov 2008 15:54:27 +0000

It’s exactly what I was looking for, thanks :]

By: Malboro Jones

Malboro Jones — Mon, 15 Sep 2008 21:14:40 +0000

heeeey can someone help me,
I’ve searched for hours on the web and cant find out how to make a boundary!
I have a ball game, simply the ball moves around at the moment, I’m really new to Flash Gaming so I’m just testing things right now, but I seriously need to know how to stop the ball from flying off the stage!
If you could send me instructions directly via email that would be great!
malborojones@hotmail.co.uk

All help will be very much appreciated thank you!

By: Managing multiple balls collisions with Flash: AS3 version : Emanuele Feronato - italian geek and PROgrammer

Sat, 07 Jun 2008 21:55:20 +0000

[...] days ago Sunil Changrani sent me a the script to manage multiple balls collisions with Flash, in [...]

By: Bradley

Bradley — Wed, 04 Jun 2008 06:29:34 +0000

This code doesn’t seem very effiecent. Check the first ball against every other one, the second against every one but the first, and so forth. That adds up to 49+48+…+3+2+1 equations solved every frame, or 1275. Mutiply that by a modest 10fps? 12250 equations per second.

Not very efficient, though it is easier to understand and code that some more advanced algorithms. A final point, if 100 balls are used, that’s 50500 times the lines inside the “for loop” are called. hmm. I don’t know about my computer, but I couldn’t calculate that many equations per second.

Good suggestion Krystian to reduce the number of checks, and also voidSkipper, that’s a great idea!