Bouncing

[Nionicle]

Ok help is what i need
I want this circle to go all bouncy off the edges of the circle and stuff.
But it wont work
here is the fla and thanks in advanced

[bchew007]

Well, I think the most basic way to do this is to use hitTest. Using four mc's at each border...
But if you want something like pool of snooker, than you will have to use real math...

Something like this:

xmov = 5;
_root.onEnterFrame = function() {
	ball._x += xmov;
	if (ball.hitTest(wallRight)) {
		xmov *= -1;
	}
	if (ball.hitTest(wallLeft)) {
		xmov *= -1;
	}
};

[Nionicle]

hmmm
i really want it bouncing inside a circle not a square.

But thanx


>...
I didnt post this right away.

I got it to do almost what i want.

Except i want the balls to bounce at more of an angle.
Please help.

[bchew007]

I see. You are no beginner no more.
Oh, you want it in a circle...
Cool .fla, want to try that too. But first I have to dig up my math knowlegde from college.

[ericlin]

If you dont mind that the ball bounces before it really hits the circle, then the codes might help.

I made a dummy movieClip, put in 0,0 point of the _root. Just for coordinate manipulation. Then the codes are modified here:

if (Math.sqrt((_root.circle._x-_x)*(_root.circle._x-_x)+(_root.circle._y-_y)*(_root.circle._y-_y))>radius) {
	//ypos = (ypos+(Math.random())-.5)*-1;
	//xpos = (xpos+(Math.random())-.5)*-1;
	_x -= xpos;
	_y -= ypos;
	dummy = _root.dummy;
	dummy._rotation = (180/Math.PI)*Math.atan2(_y-_root.circle._y, _x-_root.circle._x);
	pt = {x:xpos, y:ypos};
	dummy.globalToLocal(pt);
	pt.x *= -1;
	dummy.localToGlobal(pt);
	ypos = pt.y;
	xpos = pt.x;
	_x += xpos;
	_y += ypos;
}

[Nionicle]

wohhhhh
local to global? do i look that smart?
lol

still not sure where to put that code? in frame one of main timeline?

[ericlin]

Here is the fla.