Nape-entity

package com.ulfben.slingshot.entities
{
    import nape.geom.Vec2;
    import nape.phys.Body;
    import nape.space.Space;

    import starling.display.DisplayObject;
    import starling.display.Sprite;

    public class Entity extends Sprite
    {
        public var _isDead:Boolean = false;
        protected var _body:Body = null;
        protected var _space:Space = null;
        protected var _visual:DisplayObject; //MovieClip, Sprite or what have you
        protected var _graphicOffset:Vec2 = new Vec2(0,0); //from PhysicEditor

        public function set body(b:Body):void {_body = b;}
        public function get body():Body {return _body;}
        public function set space(s:Space):void { _space = s; if(_body){_body.space = _space;}}
        public function set allowMovement(b:Boolean):void {_body.allowMovement = b;}
        public function get allowMovement():Boolean {return _body.allowMovement;}
        public function get velocity():Vec2 {return _body.velocity;}
        public function set velocity(v:Vec2):void {_body.velocity = v;}
        public function get angularVel():Number  {return _body.angularVel;}
        public function set angularVel(n:Number):void  {_body.angularVel = n;}
        public function get position():Vec2  {return _body.position;}
        public function set position(v:Vec2):void  {_body.position = v; x = _body.position.x; y = _body.position.y; }

        public function Entity(space:Space)
        {
            super();
            _space = space;
            touchable = false;
        }

        public function setxy(x:Number, y:Number):void
        {
            _body.position.x = x;
            _body.position.y = y;
        }

        private var pos:Vec2; //temp, for re-use.
        public function tick(dt:Number):void
        {
            pos = _body.localPointToWorld(_graphicOffset);
            x = pos.x;
            y = pos.y;
            rotation = _body.rotation;
        }

        override public function dispose():void
        {
            if(_body){
                _space.bodies.remove(_body);
                _body.shapes.clear();
                _body.userData.entity = null;
                _body.userData.graphicOffset = null;
                _body = null;
            }
            if(_visual){
                _visual.removeFromParent(true);
                _visual = null;
            }
            _space = null;
            super.dispose();
        }
    }
}