import mx.transitions.Tween;
import mx.transitions.easing.Regular;
import mx.utils.Delegate;

class Throbber extends MovieClip {

	private var _leafSize:Number = 8;
	private var _color:Number = 0x808080;
	private var _leafCount:Number = 8;
	private var _circleRadius:Number = 14;
	private var _padding:Number = 10;
	private var throbber:MovieClip;
	private var intervalArray:Array;
	private var tweenArray:Array;
	
	// no constructor
	
	function init(width:Number, height:Number) {

		this.throbber = this.createEmptyMovieClip("throbber", this.getNextHighestDepth());
		this.throbber._x = this._circleRadius + this._padding;
		this.throbber._y = 0;
		this.intervalArray = new Array();
		this.tweenArray = new Array();
		var offsetMilliseconds = new Date().getMilliseconds();
		for (var i=1; i <= this._leafCount; i++) {
			this.throbber["leaf" + i] = this.throbber.createEmptyMovieClip("leaf" + i, this.throbber.getNextHighestDepth());
			this.drawLeafCircle(this.throbber["leaf" + i], (Math.cos((i * (360 / this._leafCount)) * (3.14/180)) * this._circleRadius), (Math.sin((i * (360 / this._leafCount)) * (3.14/180)) * this._circleRadius));
			//this.drawLeafStub(this.throbber["leaf" + i], (Math.cos((i * (360 / this._leafCount)) * (3.14/180)) * this._circleRadius), (Math.sin((i * (360 / this._leafCount)) * (3.14/180)) * this._circleRadius));
			this.throbber["leaf" + i]._alpha = 25;
			this.intervalArray[i] = setInterval(
				Delegate.create(this, 
					function (i) { 
							this.tweenArray[i] = new Tween(this.throbber["leaf" + i], "_alpha", Regular.easeOut, 100, 25, 1, true);
							this.tweenArray[i].onMotionFinished = function () {
								this.rewind();
								this.start();
							};
						clearInterval(this.intervalArray[i]);
					}
				)
			, (((1000 / this._leafCount) * i) - (new Date().getMilliseconds() - offsetMilliseconds)), i);
		}
		
	}
	
	function drawLeafStub (target:MovieClip, x:Number, y:Number) {
		target.lineStyle(this._leafSize, this._color, 100);
		target.moveTo(x, y);
		target.lineTo(x*1.5, y*1.5);
	}

	function drawLeafCircle (target:MovieClip, x:Number, y:Number) {
		var w = this._leafSize;
		var h = this._leafSize;
		// center the circle
		w /= 2; h /= 2;
		x += w; y += h;
		var xc1 = w*(Math.SQRT2-1), xc2 = w*(Math.SQRT2/2);
		var yc1 = h*(Math.SQRT2-1), yc2 = h*(Math.SQRT2/2);
		target.lineStyle(0, this._color, 100);
		target.beginFill(this._color);
		target.moveTo(x+w, y);
		target.curveTo(x+w, y+yc1, x+xc2, y+yc2);
		target.curveTo(x+xc1, y+h, x, y+h);
		target.curveTo(x-xc1, y+h, x-xc2, y+yc2);
		target.curveTo(x-w, y+yc1, x-w, y);
		target.curveTo(x-w, y-yc1, x-xc2, y-yc2);
		target.curveTo(x-xc1, y-h, x, y-h);
		target.curveTo(x+xc1, y-h, x+xc2, y-yc2);
		target.curveTo(x+w, y-yc1, x+w, y);
		target.endFill();
	}

	/* It is important to stop previous Tween object instantiation if this class 
	 * is to be created/removed more than once in a specific animation */
	function _close () {
		for (var tCnt in this.tweenArray) {
			this.tweenArray[tCnt].stop();
			delete(this.tweenArray[tCnt]);
		}
		for (var iCnt in this.intervalArray) {
			clearInterval(this.intervalArray[iCnt]);
			delete(this.intervalArray[iCnt]);
		}
		this.removeMovieClip();
	}
	
}