[AS3] bullet spawning pattern help

[ImprisonedPride]

onEnterFrame = run;

deg2rad = Math.PI/180;
rad2deg = 180/Math.PI;
delay = 7;
timer = 0;

function run() {
	timer++;
	if (timer%delay == 0 && Key.isDown(Key.CONTROL)) {
		fire();
	}
	dx = _xmouse - _root.spawn._x;
	dy = _ymouse - _root.spawn._y;	
	xd = spawn._x-_root._xmouse;
	yd = spawn._y-_root._ymouse;
	rot = Math.atan2(yd, xd);
	angle.text = rot*rad2deg+180;;
}

function fire() {
	bc = Number(_root.bullets.text)-1;
	sa = Number(_root.spreadAngle.text);
	st = bc * sa;
	sp = st/2;
	s = 90 + sp;
	e = 90 - sp;
	for (var i = s; i>=e; i-=sa) {
		var ang = i; 
		ang *= deg2rad;
		var b = attachMovie("bullet", "b"+getNextHighestDepth(), getNextHighestDepth());
		b.xc = 10*Math.cos(ang);
		b.yc = 10*Math.sin(ang);
		b._x = spawn._x;
		b._y = spawn._y;
		b.onEnterFrame = function() {
			this._x += this.xc;
			this._y += this.yc;
			if (this._x < 0 || this._x > Stage.width || this._y < 0 || this._y > Stage.height) {
				this.removeMovieClip();
			}
		}
	}
}

stop();

Here's test 2. Play with the numbers again. I got it right this time. Angle Test 2

You can see an example of a variable pointing angle by replacing the start/end variable lines with

	s = (rot*rad2deg+180) + sp;
	e = (rot*rad2deg+180) - sp;

Then hold Control while you move the mouse.