package{

     import Box2D.Common.Math.b2Vec2;

     import Box2D.Dynamics.b2Body;

     import Box2D.Dynamics.Joints.b2LineJointDef;

     import Box2D.Dynamics.Joints.b2PrismaticJointDef;

     /**

     * 线关节，限制一个刚体只能在一个轴向上移动

     */

     public class Main extends BaseMain{

         public function Main(){

             super(new b2Vec2(0,10));

         }

         override protected function init():void{

             var bodyA:b2Body=this.createBox(50,50,400,300);

             var bodyB:b2Body=this.createCircle(25,400,300);

             bodyA.SetType(b2Body.b2_staticBody);

             var jointDef:b2LineJointDef=new b2LineJointDef();

             var anchor:b2Vec2=bodyA.GetWorldCenter();

             var axis:b2Vec2=new b2Vec2(1,0);

             jointDef.Initialize(bodyA,bodyB,anchor,axis);

             _world.CreateJoint(jointDef);

         }

     };

 }