package{

    import Box2D.Collision.b2AABB;

    import Box2D.Collision.b2RayCastInput;

    import Box2D.Collision.b2RayCastOutput;

    import Box2D.Collision.Shapes.b2CircleShape;

    import Box2D.Collision.Shapes.b2PolygonShape;

    import Box2D.Collision.Shapes.b2Shape;

    import Box2D.Common.Math.b2Vec2;

    import Box2D.Dynamics.b2Body;

    import Box2D.Dynamics.b2BodyDef;

    import Box2D.Dynamics.b2Fixture;

    import Box2D.Dynamics.b2FixtureDef;

    import Box2D.Dynamics.b2World;

    import flash.display.Sprite;

    import flash.utils.getTimer;

    import Box2D.Dynamics.Joints.b2PulleyJoint;

    import Box2D.Dynamics.Joints.b2PulleyJointDef;

    import Box2D.Dynamics.Controllers.b2BuoyancyController;

    /**

    *

    */

    public class Main extends BaseMain{

        private var _bodies:Vector.<b2Body>=new Vector.<b2Body>();

        public function Main(){

            super(new b2Vec2(0,10));

        }

        override protected function init():void{

            createBodies();

            createBuoyancyController();

        }

        private function createBodies():void{

            for(var i:int=0;i<50;i++){

                var x:Number=stage.stageWidth*0.5;

                var y:Number=50;

                var body:b2Body=Math.random()>0.5?createBox(20,20,x,y):createCircle(10,x,y);

                _bodies.push(body);

            }

        }

        private function createBuoyancyController():void{

            var controller:b2BuoyancyController=new b2BuoyancyController();

            controller.angularDrag=0.5;

            controller.density=1.5;//设置水的密度,要大于水中刚体的密度才能上浮

            //controller.gravity=null;

            controller.linearDrag=0.5;

            controller.normal.Set(0,-1);//设置水面的法向量

            controller.offset=-200/_pixelToMeter;//水面的高度，默认在最顶部（y轴0的位置）,-100表示向下移动100

            //controller.useDensity=false;

            //controller.useWorldGravity=true;

            //controller.velocity.Set(0,0);

            _world.AddController(controller);

            for(var i:int=0;i<_bodies.length;i++){

                controller.AddBody(_bodies[i]);

            }

        }

        override protected function stepBefore():void{ 

        }

    };

}