package bars {

    import flash.display.Sprite;

    public class PercentageBar extends Sprite{

        public var total:Number;
        public var current:Number;
        protected var fullWidth:int;
        protected var fullHeight:int;

        protected var bar:Sprite;

        public function PercentageBar(totalAmount:int, startAmount:int) {

            total = totalAmount;
            current = startAmount;

            initBar();

        }

        protected function initBar():void{

            bar = new Bar();
            this.addChild(bar);
            fullWidth = bar.width;
            fullHeight = bar.height;

        }

        public function changePercent(changeBy:int):void{

            current += changeBy;

            (current >= total) ? current = total : current;
            (current <= 0) ? current = 0 : current;

            bar.width = calculatePercentage() * fullWidth;

        }

        protected function calculatePercentage():Number{

            return current/total;

        }

        public function updateBar(newNumber:Number):void{

            current = newNumber;

            bar.width = calculatePercentage() * fullWidth;

        }

    }

}