[iNils]

Что-то в таком духе.

var mc:MovieClip = this.createEmptyMovieClip ("mc", 0);
mc._x = Stage.width / 2;
mc._y = Stage.height / 2;
var array:Array = new Array ({x:1, y:0});
var maxRadius:Number = 400;
var dx:Number = 5;
mc.onEnterFrame = function () {
	this.clear ();
	this.lineStyle (5, 0xFF0000);
	array.push ({x:this._xmouse, y:this._ymouse});
	this.moveTo (array[0].x, array[0].y);
	for (var i:Number = 1; i < array.length; i++) {
		var point:Object = array[i];
		this.lineStyle (5, 0xFF0000);
		var radius:Number = Math.sqrt (point.x * point.x + point.y * point.y);
		var angle:Number = Math.atan2 (point.y, point.x);
		this.lineTo (point.x, point.y);
		point.x += dx * Math.cos (angle + .1);
		point.y += dx * Math.sin (angle + .1);
		if (radius > maxRadius) {
			array.shift ();
		}
	}
};