平移关节(Prismatic Joint)

 package{
     import Box2D.Common.Math.b2Vec2;
     import Box2D.Dynamics.b2Body;
     import Box2D.Dynamics.Joints.b2PrismaticJointDef;

     /**
     * 平移关节，将两个刚体锁定一个平移的轴，其中一个刚体移动另一个刚体的锁定轴坐标也移动
     */
     public class Main extends BaseMain{

         public function Main(){
             super(new b2Vec2(0,10));
         }

         override protected function init():void{
             var bodyA:b2Body=this.createBox(50,50,100,400);
             var bodyB:b2Body=this.createCircle(25,700,400);

             var jointDef:b2PrismaticJointDef=new b2PrismaticJointDef();

             var anchor:b2Vec2=bodyA.GetWorldCenter();
             var axis:b2Vec2=new b2Vec2(1,0);
             jointDef.Initialize(bodyA,bodyB,anchor,axis);
             _world.CreateJoint(jointDef);

             bodyA.SetFixedRotation(true);
         }

     };
 }

更多说明：http://blog.csdn.net/qq51931373/article/details/9019937

源码下载：http://yunpan.cn/c3aTsiqhQ6Ikc  访问密码 41ea